Gastric adenocarcinoma and periodontal disease: A systematic review and meta-analysis

Abstract Background The oral cavity is a link between of external environment with gastrointestinal tract. Studies are controversial on the presence of Periodontal Disease (PD) and its association with Gastric Adenocarcinoma (GAC). Methods The authors performed a systematic review and meta-analysis to verify the association between PD and GAC. Six electronic databases were evaluated between 1961 and 2022. Titles and abstracts were reviewed independently according to the eligibility criteria, assessing full texts of selected studies. The quality of the included research was verified using the Newcastle-Ottawa Scale for case-control and cohort studies. Statistical analyses were performed based on fixed and/or random effects models to calculate the summarized Relative Risk (RR) and its 95 % Confidence Interval (95 % CI). Results There were 639 studies, of which nine articles were included (3 case-controls and 6 cohorts). Overall, the authors identified 1,253 cases of GAC 2,501 controls in case-control studies, and 1,631 patients with GAC enrolled in cohort studies. Patients presenting PD increased the risk of developing GAC by 17 % (RR=1.17; 95 % CI 1.03‒1.32), which remained regardless of the diagnostic method for PD, i.e., clinical examination (RR = 1.19; 95 % CI 1.14‒1.24) and self-report (RR = 1.34; 95 % CI 1.06‒1.69). Moreover, Asian patients (RR=1.17; 95 % CI 1.00‒1.36) with PD had a higher risk of having GAC than American and European patients (RR = 1.18; 95 % CI 0.84‒1.66). Conclusions The presence of PD the risk of GAC suggesting that its infectious-inflammatory process of PD may be related to GAC development. Further investigations on the oral-gastric microbiota and its role in the carcinogenesis of gastric cancer should be carried out, and the screening of patients with potential risk for GAC should be considered in the clinical practice of dentists.

The association Between Sleep Quality, Fatigue and Periodontal Status: a pilot study / La asociación entre la calidad del sueño, la fatiga y el estado periodontal: un estudio piloto

Abstract Reduced sleep duration, poor sleep quality and fatigue are related to reduced immunity and increased inflammatory markers. Due to its potential to influence inflammation, poor sleep quality and fatigue could be factors for periodontitis and quality of life. Ninety-three individuals with untreated periodontitis and thirty-one individuals with healthy gingiva were included in the study. The research involved a clinical examination and a questionnaire. Demographic information, information on oral health, oral hygiene habits, the Pittsburgh Sleep Quality Index, Jenkins Sleep Scale, Multidimensional Assessment of Fatigue Scale, and Oral Health Impact Profile-14 were included in the questionnaire. Patients were diagnosed based on the 2017 World Workshop on the Classification of Periodontal and Peri-Implant Diseases and Conditions. No statistically significant difference was revealed between sleep quality, fatigue, oral health related quality of life, and stage-grade of periodontitis (p<0.05). However, periodontitis group had higher Oral Health Impact Profile-14 scores (p<0.05). A statistically significantly lower sleep duration was observed in stage IV periodontitis group than the other groups (p<0.05). A statistically significant positive correlation was observed between the Pittsburgh Sleep Quality Index and the scores of the other questionnaires (p<0.05). The stage of periodontitis may impact sleep duration.

Resumen La reducción de la duración del sueño, la mala calidad del sueño y la fatiga están relacionados con una inmunidad reducida y un aumento de los marcadores inflamatorios. Debido a su potencial para influir en la inflamación, la mala calidad del sueño y la fatiga podrían ser factores determinantes en el desarrollo de la periodontitis e incidir en la calidad de vida. Noventa y tres personas con periodontitis no tratada, además de treinta y una personas con encía sana se incluyeron en el estudio. La investigación involucró un examen clínico y un cuestionario. En el cuestionario se incluyeron información demográfica, información sobre salud bucal, hábitos de higiene bucal, el índice de calidad del sueño de Pittsburgh, la escala de sueño de Jenkins, la escala de evaluación multidimensional de la fatiga y el perfil de impacto en la salud bucal-14. Los pacientes fueron diagnosticados en base al Taller Mundial 2017 sobre la Clasificación de Enfermedades y Condiciones Periodontales y Periimplantarias. No se revelaron diferencias estadísticamente significativas entre la calidad del sueño, la fatiga, la calidad de vida relacionada con la salud bucal y el grado de etapa de la periodontitis (p<0,05). Sin embargo, el grupo de periodontitis tuvo puntajes más altos en el Perfil de Impacto en la Salud Oral-14 (p<0.05). Se observó una duración del sueño significativamente menor desde el punto de vista estadístico en el grupo de periodontitis en estadio IV que en los otros grupos (p<0,05). Se observó una correlación positiva estadísticamente significativa entre el Índice de Calidad del Sueño de Pittsburgh y las puntuaciones de los otros cuestionarios (p<0,05). La etapa de la periodontitis puede afectar la duración del sueño.

Assessment of Subgingival Biofilm and its Relationship with the Status of Tumors in a Population with Breast Cancer

This study aimed to compare the subgingival microbiota of subjects with and without breast cancer (BC). Patients with BC (Group 1; n= 50) and without BC (Group 2; n=50) with periodontitis (A) and without periodontitis (B). The study was conducted in two phases (P1 and P2). One biofilm sample was collected from each subject and analyzed by DNA-DNA Hybridization (Checkerboard DNA-DNA). The relative abundance of the subgingival microbiota differed between the Case and Control groups. However, some species were higher in patients in the Case than in Control subjects and differed between the groups in both phases. Composition of the subgingival microbial community according to the Socransky complex was related to periodontal disease, followed by clinical attachment of level (CAL ≥4mm), age, and tooth loss, which were found to be abundant in Cases when compared with controls. Patients with Tumor Grade II and III had a higher prevalence of tooth loss and CAL≥4mm. It was concluded that in individuals with BC, the sub-gingival microbiota exhibited atypical changes, but they developed periodontal disease.

El objetivo de este estudio fue comparar la microbiota subgingival de sujetos con y sin cáncer de mama (CM). Pacientes con CM (Grupo 1; n= 50) y sin CM (Grupo 2; n=50) con periodontitis (A) y sin periodontitis (B). El estudio se realizó en das fases (P1 y P2). Se recogió una muestra de biopelícula de cada sujeto y se analizó mediante hibridación ADN-ADN (tablero de ajedrez ADN-ADN). La abundancia relativa de la microbiota subgingival difirió entre los grupos de Caso y Control. Sin embargo, algunas especies fueron más altas en los pacientes del Caso que en los sujetos del Control y difirieron entre los grupos en ambas fases. La composición de la comunidad microbiana subgingival según el complejo de Socransky se relacionó con la enfermedad periodontal, seguida por el nivel de inserción clínica (CAL≥4mm), la edad y la pérdida de dientes, que se mostró abundante en los casos en comparación con los controles. Los pacientes con Tumor Grado II y III tuvieron mayor prevalencia de pérdida dental y CAL≥4mm. Se concluyó que en individuos con CM la microbiota subgingival presentó cambios atípicos, pero sin embargo, desarrollaron enfermedad periodontal.

Enfermedad periodontal y su relación con la diabetes

La diabetes mellitus es una enfermedad sistémica padecida en la actualidad por gran parte de la población. Padecer una enfermedad sistémica predispone la aparición de enfermedades periodontales. La gravedad de la enfermedad periodontal está afectada por la respuesta inflamatoria. Células como IL-1β, IL-6 y TNF-α se elevan de forma crónica y persistente. La enfermedad periodontal prevalente en el paciente diabético suele ser la periodontitis por enfermedades sistémicas. Se observan ciertas afectaciones en ligamentos y hueso (deterioro o pérdida), por lo que resulta importante que el odontólogo conozca todo lo que involucra la enfermedad periodontal en un paciente diabético. Para la presente investigación se realizó una revisión bibliográfica en importantes bases de datos como: Pubmed y Scopus. El objetivo propuesto fue: establecer la interrelación entre las enfermedades periodontales y la diabetes y determinar entre las enfermedades periodontales la de mayor prevalencia en pacientes diabéticos.

Diabetes mellitus is a systemic disease currently suffered by a large part of the population. Having a systemic disease predisposes the appearance of periodontal diseases. The severity of periodontal disease is affected by the inflammatory response. Cells such as IL-1β, IL-6, and TNF-α are chronically and persistently elevated. The prevalent periodontal disease in diabetic patients is usually periodontitis due to systemic diseases. Certain affectations are observed in ligaments and bone (deterioration or loss), so it is important that the dentist knows everything that periodontal disease involves in a diabetic patient. For the present investigation, a bibliographic review was carried out in important databases such as: Pubmed and Scopus. The proposed objective was: to establish the relationship between periodontal diseases and diabetes and to determine the periodontal diseases with the highest prevalence in diabetic patients.

Diseño y validación de una escala de riesgo de parto pretérmino con enfoque periodontal / Design and validation of a preterm birth risk scale with a periodontal approach i: en

Introducción: La escala de riesgo diseñada para estimar la probabilidad de parto pretérmino con enfoque periodontal debe ser validada antes de su implementación en la práctica clínica. Objetivo: Diseñar y validar una escala de riesgo de parto pretérmino con enfoque periodontal. Métodos: Se realizó un estudio analítico, de casos y controles, de 1152 puérperas ingresadas en los hospitales maternos de la provincia de Santiago de Cuba en el período 2011-2022, para lo cual fueron seleccionadas 2 muestras: una de construcción del modelo (n=750) y otra de validación de la escala (n=402). Se determinaron los posibles predictores a través del análisis univariado y el cálculo del odds ratio, con un nivel de significación de p≤0,05; asimismo, se elaboró un modelo de regresión logística binaria multivariada y se obtuvo la escala de riesgo que fue validada por diferentes métodos. Resultados: La escala se obtuvo con 7 predictores y 2 estratos de riesgo. Esta alcanzó buena discriminación (80 %), así como buen nivel de ajuste y validez de constructo (p=0,72). Igualmente, aseguró una predicción correcta de más de 50 % de los partos pretérmino, valores de sensibilidad y especificidad aceptables (79,20 y 70,20 %, respectivamente), así como validez de contenido, validez interna y confiabilidad adecuadas. Conclusiones: La escala de riesgo para estratificar el riesgo de parto pretérmino incluye predictores de gravedad de la enfermedad periodontal, con buenos parámetros de validación para ser usada en la toma de decisiones para prevenir este tipo de parto.

Introduction: The risk scale designed to estimate the probability of preterm birth with periodontal approach should be validated before its implementation in the clinical practice. Objective: To design and validate a risk scale of preterm birth with periodontal approach. Methods: A cases and controls analytic study of 1152 newly-delivered women admitted to maternal hospitals in Santiago de Cuba province was carried out in the period 2011 - 2022, and 2 samples were selected: one of pattern construction (n=750) and another of scale validation(n=402). The possible predictors were determined through the single varied analysis and odds ratio calculation, with a significance level of p≤0.05; also, a multivariate binary logistical regression model was elaborated and the risk scale was obtained, which was validated by different methods. Results: The scale was obtained with 7 predictors and 2 risk stratum. It reached a good discrimination (80%), as well as a good adjustment level and construction validity (p=0.72). Likewise, it assured a correct prediction of more than 50% of preterm births, acceptable sensibility and specificity values (79.20 and 70.20%, respectively), as well as adequate content validity, internal validity and reliability. Conclusions: The risk scale to stratify the risk of preterm birth includes predictors of periodontal disease severity, with good validation parameters to be used in the decisions making to prevent this type of childbirth.

Prevalência e Autoconhecimento de Indicadores de Inflamação Sugestivos de Doença Periodontal em Militares / Prevalence And Self-Knowledge Of Indicators Of Inflammation Suggestive of Periodontal Disease In Military Personne

O objetivo deste estudo foi identificar a prevalência e o autoconhecimento para indicadores de inflamação sugestivos de doença periodontal em militares de ambos os sexos. Os militares foram recrutados para realização de um censo odontológico para toda a população do Centro de Instrução Almirante Wandenkolk (CIAW) da Marinha do Brasil, totalizando 409 voluntários. Foram formados dois grupos para posterior análise: Grupo 1- contendo exclusivamente mulheres e Grupo 2- contendo exclusivamente homens. Foram realizados 409 exames clínicos e analisados 409 questionários. Os resultados demonstraram que, quanto aos participantes militares, 40,1% foram do sexo feminino e 59,9%, do sexo masculino; 87% faziam uso do fio dental, desses 56% usavam diariamente; 77% apresentaram frequência de escovação de três vezes ao dia ou mais; 74,3% relataram que visitam regularmente o dentista, e a proporção de mulheres que frequenta regularmente o dentista superou significativamente a proporção de homens que o fizeram (I.C. 95%; p < 0,001); 61,6% afirmaram conhecer a doença periodontal. A avaliação profissional verificou a presença de indicadores de inflamação sugestivos de doença periodontal em 45,2% participantes, desses 37% eram do gênero feminino e 63%, do gênero masculino, não sendo observada diferença estatística entre os gêneros (I.C. 95%; p = 0,2248). Concluiu-se que a prevalência de indicadores de inflamação sugestivos de doença periodontal encontrada foi de 45,2%; o autoconhecimento dos militares sobre doença periodontal foi baixo, apenas 19%; dessa forma foi verificada diferença estatística entre o conhecimento das mulheres e dos homens; e observou-se que a maioria dos participantes estava dentro da frequência correta para consulta de retorno ao dentista.

The objective of this study was to identify the prevalence and self-recognition for indicators of inflammation suggestive of periodontal disease in military personnel of both genders. The military personnel was recruited to conduct a dental census for the entire population of the Admiral Wandenkolk Training Center of the Brazilian Navy, totaling 409 volunteers. Two groups were formed for further analysis: Group 1- containing exclusively women and Group 2- containing exclusively men. A total of 409 clinical examinations were performed and the questionnaires were analyzed. The results showed that, regarding the military participants, 40.1% were female and 59.9% were male; 87% used dental floss, of which 56% used it daily; 77% brushed three times a day or more; 74.3% reported that they visited the dentist regularly, and the proportion of women who regularly visited the dentist significantly exceeded the proportion of men who did (C.I. 95%; p<0.001); 61.6% said they knew about periodontal disease. The professional evaluation verified the presence of inflammation indicators suggestive of periodontal disease in 45.2% of the participants, of which 37% were female and 63% were male, with no statistical difference between genders (95% CI, p=0.2248). The prevalence of inflammation indicators suggestive of periodontal disease was 45.2%; the self-knowledge of the military about the periodontal disease was low, only 19%; thus a statistical difference was found between the knowledge of females and males; and it was observed that most participants were within the correct frequency for return visits to the dentist.

A modified tunnel technique to treat multiple gingival recessions: Case Series

Abstract This case series reports a modified tunnel technique with connective tissue graft for the root coverage of multiple Miller Class I, II, and III gingival recessions. The modified approach presents an innovative suture technique to improve the stability and position of the graft. Ten patients with multiple gingival recessions (n=85 teeth) received surgical root coverage treatment. The gingival recession height and width were measured and presented as median, minimum, and maximum values. The percentage of the root coverage after at least 12 months expressed the treatment effectiveness. The Shapiro-Wilk test evaluated the normality; pared Wilcoxon test determined the exact P-value for the differences in the height of the gingival recession before and after surgical treatment (α = 0.05). An average of 97.9% (± 5.6%, p < 0.0001) root coverage after treatment occurred, and 73 out of 85 recessions presented complete root coverage after 12 months. Treatment of Miller class I and II gingival recessions resulted in root coverage higher than 99 and class III higher than 95% (p < 0.0001). The presented case series report the efficacy of a modified surgical technique promoting more than 95% of root coverage after 12 months in multiple Miller Class I, II, and III gingival recessions. Well-designed blind randomized controlled trials are needed to validate the proposed technique.

Resumo Esta série de casos relata uma técnica de túnel modificada com enxerto de tecido conjuntivo para o recobrimento radicular de múltiplas recessões gengivais Classe I, II e III de Miller. A abordagem modificada apresenta uma técnica de sutura inovadora para melhorar a estabilidade e a posição do enxerto. Dez pacientes com múltiplas recessões gengivais (n=85 dentes) receberam tratamento cirúrgico de recobrimento radicular. A altura e a largura da recessão gengival foram mensuradas e apresentadas como valores medianos, mínimos e máximos. A eficácia do tratamento foi expressa como uma porcentagem da cobertura radicular após pelo menos 12 meses. O teste de Shapiro-Wilk avaliou a normalidade; o teste de Wilcoxon pared determinou o valor P exato para as diferenças entre a altura da recessão gengival antes e após o tratamento cirúrgico (α = 0,05). Uma média de 97,9% (± 5,6%, p < 0,0001) de cobertura radicular após o tratamento ocorreu, e 73 das 85 recessões apresentaram cobertura radicular completa após 12 meses. O tratamento das recessões gengivais classe I e II de Miller resultou em recobrimento radicular superior a 99 e classe III superior a 95% (p < 0,0001). A série de casos apresentada relata a eficácia de uma técnica cirúrgica modificada promovendo mais de 95% de cobertura radicular após 12 meses em múltiplas recessões gengivais Classe I, II e III de Miller. Ensaios controlados randomizados cegos bem desenhados são necessários para validar a técnica proposta.

Clinical and microbiological assessment in a subpopulation of young Argentine patients with severe periodontitis / Periodontitis severa en jóvenes argentinos. Evaluación clínica y microbiológica en jóvenes argentinos con periodontitis severa

ABSTRACT Aggressive periodontitis (AP) is the most serious entity of periodontal disease (stage III/IV, grade C periodontitis according to the latest classification, 2017). Aim: to enhance knowledge of periodontal microbiota in AP in native Argentine patients and describe the effect of a combined pharmacological-mechanicalperiodontal treatment on clinical and microbiological parameters. Materials andMethod: The study analyzed 42 periodontal sites in 11 patients diagnosed with AP. Clinical periodontal parameters were recorded at baseline, 45, 90 and 180 days. Microbiological samples were taken before treatment and at 180 days. PCR was used to determine presence of the periodontopathic bacteria Aggregatibacter actinomycetemcomitans (Aa), Porphyromonas gingivalis (Pg), Tannerella forsythia (Tf), Treponema denticola (Td), Prevotella intermedia (Pi) and Fusobacterium nucleatum (Fn). Patients underwent periodontal therapy including antibiotics (Amoxicillin 500mg + Metronidazole 250mg; 8hs/7 days), and were reevaluated at 45, 90 and 180 days. Results: Mean age was 28.4 ± 7.9 years. The initial PCR detected the following frequencies: Aa 14.3%, Pi 61.9%, Pg 71.4%, Tf 81.0%, Fn 95.2% and Td 97.6%. Baseline microbiological samples revealed significantly higher prevalence of Pg over Aa (p=0.012). Clinical parameters improved significantly after treatment (73.8% PS<5 mm; PS, NIC, SS p<0.001). At 180 days, a significant decrease in microbiological detection rates was observed (Fn, Td, Tf, Pi, Aa p<0.05). Aa was no longer detectable while Pg did not decrease significantly (p=0.052). Fn was the only study species detected in 100% (n=11:42) of residual pockets (PS>5 mm) (p=0.053). Conclusion: In the initial samples, there was significant prevalence of Pg over Aa. Significant clinical improvement was achieved after the mechanical-pharmacological treatment, with undetectable levels ofAa, while Fn persisted in residual pockets, and Pg was present at most of the treated sites.

RESUMEN La periodontitis agresiva (PA) es la entidad más grave de la enfermedad periodontal (clasificación 2017: periodontitis estadio III/IV, grado C). Objetivo: mejorar el conocimiento sobre la microbiota periodontal de la PA en sujetos nativos argentinos y describir el efecto de un tratamiento mecánico-farmacológico periodontal sobre los parámetros clínicos y microbiológicos. Materiales y Método: se estudiaron 42 sitios periodontales correspondientes a 11 pacientes con PA. Los parámetros clínicos se registraron a 0, 45, 90 y 180 días. Las tomas microbiológicas se realizaron antes de iniciar el tratamiento y a los 180 días. La determinación de especies periodontopáticas (Aggregatibacter actinomycetemcomitans (Aa), Porphyromonas gingivalis (Pg), Tannerella forsythia (Tf, Treponema denticola (Td), Prevotella intermedia (Pi) y Fusobacterium nucleatum (Fn)) se realizó por PCR. Los pacientes iniciaron terapia básica periodontal junto con antibioticoterapia (Amoxicilina 500 mg + Metronidazol 250 mg; 8 hs/7 días) y fueron evaluados a los 45, 90 y 180 días. Resultados: la edad media fue 28,4 ± 7,9 años. Las detecciones iniciales fueron: Aa 14,3%, Pi 61,9%, Pg 71,4%, Tf 81,0%, Fn 95,2% y Td 97,6%. En las muestras iniciales la prevalencia de Pg sobre Aa fue significativamente superior (p=0,012). Los pacientes tuvieron una respuesta clínica favorable al tratamiento (73,8% PS<5 mm; PS, NIC, SS p<0,001). A 180 días, se observó una disminución estadísticamente significativa en la detección microbiana (Fn, Td, Tf, Pi, Aa p<0,05). En igual plazo, Aa no fue detectado, mientras que Pg mostró una disminución no significativa (p=0,052). Fn fue el único detectado en el 100% (n=11:42) de las bolsas periodontales residuales (PS>5 mm) (p=0,053). Conclusión: Las muestras iniciales evidenciaron prevalencia significativa de Pg sobre Aa. El tratamiento logró una significativa mejora clínica con niveles indetectables de Aa. La persistencia de Fn en las bolsas residuales y de Pg en la mayoría de los sitios tratados, caracterizaron la muestra poblacional estudiada.

Diferencia en la expresión del ligando de receptor activador para el factor nuclear K B, en tejido tumoral frente a la infección por diferentes patógenos periodontales / Difference in receptor activator of nuclear factor K B expression in tumoral tissue by different periodontal pathogens

La enfermedad periodontal es una de las principales causas de pérdida dentaria. Clínicamente, esta patología, mediada por la desregulación del sistema inmune producto de una disbiosis ocurrida en el surco gingival, inicia con la inflamación de la encía y evoluciona con el daño irreversible de los tejidos que rodean el diente. El hueso alveolar es uno de los tejidos afectados esta patología, esto debido a la activación de osteoclastos por la sobreexpresión de la proteína RANKL en el huésped. El propósito de este trabajo es determinar el nivel de sobreexpresión de RANKL, en un modelo de células tumorales U2OS, frente a la infección con Porphyromonas gingivalis y Prevotella intermedia. Para identificar el nivel de RANKL, se definieron cuatro grupos: Un grupo control, no tratado; Grupo PG, tratado con P. gingivalis; Grupo PI, tratado con P. Intermedia; y un grupo PG+PI, tratado con ambas bacterias. El nivel relativo de la proteína RANKL fue determinado en el sobrenadante y en los extractos celulares de manera independiente, mediante la técnica Western blot. En sobrenadantes, el grupo PG mostró mayores niveles de RANKL comparados con PI (p < 0,05). En extractos celulares los niveles fueron mayores en el grupo PG+PI (p < 0,05). El grupo PI mostró los niveles más bajos de RANKL. La infección polimicrobiana resulta en una mayor expresión de RANKL en células tumorales U2OS, mientras que frente a la infección P. gingivalis, se observó mayor cantidad de RANKL soluble.

SUMMARY: Periodontal disease is one of the main causes of tooth loss. Clinically, this pathology, mediated by the deregulation of the immune system due to a dysbiosis occurred in the gingival sulcus, begins with the inflammation of the gum and evolves with the irreversible damage of the tissues that surround the tooth. Alveolar bone is one of the most affected tissues by this disease, due to the activation of osteoclasts by the upregulation of RANKL in the host. The aim of this study is to determine the increase of RANKL, in a U2OS tumor cells model, inoculated with Porphyromonas gingivalis and Prevotella intermedia. To identify the level of RANKL, four groups were defined: A control group, not treated; PG group, treated with P.gingivalis; PI group, treated with P. intermedia; and a PG+PI group, treated with both bacteria. The relative level of RANKL was determined in the supernatant and cell extracts independently, using the Western blot technique. In supernatants, the PG group showed higher RANKL levels compared to PI (p < 0.05). In cell extracts the levels were higher in the PG+PI group (p < 0.05.). The PI group showed the lowest levels of RANKL.Polymicrobial infection results in a greater expression of of soluble RANKL was observed.

Clinical identification and endodontic management of furcation canals: a case series

Abstract In the case of endodontic infection, the presence of furcation canals can be at the origin of a periodontal lesion located in the furcation. The furcation being very close to the marginal periodontium, this type of lesion can be favorable to the genesis of an endo-periodontal lesion. These furcation canals are lateral canals located on the pulp chamber floor and constitute one of the many physiological communication pathways between endodontic and periodontal tissues. These canals are most often difficult to localize, shape, and to fill because of their small diameter and length. The disinfection of the pulp chamber floor with sodium hypochlorite solution may contribute to the disinfection of furcation canals when they are not identified, shaped, and/or filled. This case series illustrates the endodontic management of visible furcation canals associated with an endo-periodontal lesion. These furcation canals had a large diameter which allowed their identification during the endodontic treatment.

Resumo No caso de infecção endodôntica, a presença de canais cavo inter-radiculares pode estar na origem de uma lesão periodontal localizada na região de furca. Sendo a furca muito próxima do periodonto marginal, esse tipo de lesão pode ser favorável à fomação de uma lesão endo-periodontal. Esses canais estão localizados no assoalho da câmara pulpar e constituem uma das inúmeras vias de comunicação fisiológica entre os tecidos endodônticos e periodontais. Esses canais são na maioria das vezes difíceis de localizar, instrumentar e obturar por causa do diâmetro e comprimento reduzidos. A desinfecção do assoalho da câmara pulpar com solução de hipoclorito de sódio pode contribuir para a desinfecção dos canais cavo inter-radiculares quando eles não são localizados, instrumentamos e/ou obturados. Os casos clínicos descritos ilustram o manejo endodôntico de canais cavo inter-radiculares visíveis associados a uma lesão endo-periodontal. Esses canais cavo inter-radiculares tinham um grande diâmetro que permitiu sua localização durante o tratamento endodôntico.

Research progress on the structure and function of the type IX secretion system of Porphyromonas gingivalis / 口腔疾病防治

@#The Porphyromonas gingivalis type IX secretion system (T9SS) is a recently discovered protein secretion system that is widely distributed in Bacillus cereus. The T9SS is structurally complex and powerful. More than 20 T9SS components have been verified, and more than 30 virulence factors can be secreted by Porphyromonas gingivalis alone, which contributes significant to the pathogenicity of Porphyromonas gingivalis. T9SS is a large protein complex spanning the inner cell membrane, periplasm, and outer cell membrane. Through the structural and functional connections among its components, it forms a sophisticated functional complex that includes power provision, energy transduction, inner and outer membrane translocation, outer membrane modification, and regulatory systems to recognize, translocate, shear, and modify cargo proteins and translocate bacterial intracellular cargo proteins to the cell surface. In recent years, with advancements in X-ray diffraction and in situ cryoelectron microscopy, the exploration of T9SS has evolved from the functional study of single components to the in situ structural study of multiprotein complexes. Still, the structural resolution of the protein still has shortcomings such as low resolution and an inability to capture dynamic functional structures. Future research directions should focus more on exploring how T9SS interacts and functions with cargo proteins. In this paper, we review the research progress on Porphyromonas gingivalis T9SS on X-ray diffraction and cryoelectron microscopy structure resolution in order to gain a deeper understanding of the transport mechanism of T9SS.

Influencia de la enfermedad periodontal en la aterosclerosis

Introducción: La enfermedad periodontal ha sido identificada como un factor de riesgo para enfermedades del corazón. La falta de hábitos de higiene bucal asociados a factores de riesgo puede conducir al desarrollo de periodontitis, lo que conducirá a un aumento de mediadores inflamatorios en la sangre, lo que es un riesgo potencial para el desarrollo del proceso de aterosclerosis. Objetivo: Evaluar en la literatura la influencia de la enfermedad periodontal en las enfermedades cardiovasculares, especialmente en relación con la aterosclerosis. Método: Consistió en una búsqueda en libros y artículos científicos, con la utilización de palabras clave asociadas, así como artículos seleccionados en las bases de datos SciELO, PubMed, Scopus, de lo cual se obtuvieron alrededor de 40 bibliografías, que fueron decantadas a 35, de ellas el 50 % actualizadas. Resultados: estudios de metaanálisis apoyan una relación causal entre la enfermedad periodontal y la cardiopatía, lo que demuestra que el riesgo de desarrollar algunas complicaciones vasculares se encontró aumentado en pacientes con problemas periodontales. Conclusiones: Se hace relevante evaluar la relación de estas enfermedades y los mecanismos implicados, para poder elaborar medidas preventivas.

Introduction: Periodontal disease has been identified as a risk factor for heart disease. The lack of oral hygiene habits associated with risk factors can lead to the development of periodontitis, which will lead to an increase in inflammatory mediators in the blood, which is a potential risk for the development of the atherosclerosis process. Objective: To evaluate in the literature the influence of periodontal disease on cardiovascular diseases, especially in relation to atherosclerosis. Method: It consisted of a search in books and scientific articles, with the use of associated keywords, as well as selected articles in the SciELO, PubMed, Scopus databases, from which around 40 bibliographies were obtained, which were narrowed down to 35, of them 50% updated. Results: Meta-analysis studies support a causal relationship between periodontal disease and heart disease, demonstrating that the risk of developing some vascular complications was found to be increased in patients with periodontal problems. Final considerations: It is relevant to evaluate the relationship between these diseases and the mechanisms involved, in order to develop preventive measures.

Introdução: A doença periodontal tem sido apontada como fator de risco para doenças cardíacas. A falta de hábitos de higiene bucal associada a fatores de risco pode levar ao desenvolvimento de periodontite, o que levará ao aumento de mediadores inflamatórios no sangue, o que representa um risco potencial para o desenvolvimento do processo de aterosclerose. Objetivo: Avaliar na literatura a influência da doença periodontal nas doenças cardiovasculares, principalmente em relação à aterosclerose. Método: Consistiu na busca em livros e artigos científicos, com utilização de palavras-chave associadas, bem como em artigos selecionados nas bases de dados SciELO, PubMed, Scopus, dos quais foram obtidas cerca de 40 bibliografias, que foram reduzidas a 35, de eles 50% atualizados. Resultados: Estudos de meta-análise apoiam uma relação causal entre doença periodontal e doença cardíaca, demonstrando que o risco de desenvolver algumas complicações vasculares foi aumentado em pacientes com problemas periodontais. Considerações finais: É relevante avaliar a relação entre estas doenças e os mecanismos envolvidos, para desenvolver medidas preventivas.

Impact of maternal periodontal health on fetus weight in Iraqi pregnant women: a clinical study / Impacto da saúde periodontal materna no peso fetal em gestantes iraquianas: um estudo clínico

Objective: the aim of this study was to investigate the relationship between periodontal health condition and the weight of fetuses in Iraqi pregnant women in order to magnify the importance of periodontal health maintenance during pregnancy. Material and Methods: fetus weight was determined using ultrasound scanning for 222 pregnant women, accordingly they were divided into two groups: group A: normal fetus weight and group B: below normal fetal weight. Their periodontal condition was examined by means of Plaque index (PI), Gingival index (GI), Bleeding on probing (BOP) and Clinical Attachment loss (CAL) using WHO CPITN periodontal probe. WHO charts of normal fetal weight for each week were considered to determine the normality of fetus weight. Results: significant value p=0.00 was obtained when comparing the examined periodontal parameters between groups A and B, mean of periodontal parameters of PI, GI and BOP were higher in group B (1.1964: 1.4541), (1.1877: 1.4925), (0.3553: 1.3748) respectively. Q2 and IQR of PI, BOP and GI in group A were (1.190:0.3), (0.30:0.5), (1.160:0.3) respectively. And (1.460:0.24) (1.50:0.7) (1.460:0.26) in Group B. There were 4 cases of CAL in group A as opposed to 88 cases in group B, Q2 of CAL in group A=0.00, Q2 in group B=1.00. IQR=0.00 in both groups. Non-significant value p=0. 503(p>0.05) was seen when comparing the incidence of low fetal weight between the three trimesters. Conclusion: it is important to maintain a good periodontal condition and oral Hygiene status in pregnant women for healthier fetal weight and healthier pregnancy with less complications. (AU)

Objetivo: o objetivo deste estudo foi investigar a relação entre a condição de saúde periodontal e a peso dos fetos em gestantes iraquianas para ampliar a importância da manutenção da saúde periodontal durante a gravidez. Material e Métodos: o peso do feto foi determinado por ultrassonografia 222 As gestantes, consequentemente, foram divididas em dois grupos: grupo A: peso normal do feto e grupo B: abaixo do peso fetal normal. Sua condição periodontal foi examinada por meio de índice de placa (IP), gengival índice (GI), Sangramento na sondagem (BOP) e Perda de Inserção Clínica (CAL) usando a sonda periodontal CPITN da OMS. Os gráficos da OMS de peso fetal normal para cada semana foram considerados para determinar a normalidade do peso feto. Resultados: obteve-se valor significativo p=0,00 quando comparados os parâmetros periodontais examinados entre nos grupos A e B, as médias dos parâmetros periodontais do IP, GI e BOP foram maiores no grupo B (1,1964: 1,4541), (1,1877: 1,4925), (0,3553: 1,3748), respectivamente. Q2 e IQR do PI, BOP e GI no grupo A foram (1,190:0,3), (0.30:0.5), (1.160:0.3) respectivamente.E (1.460:0.24) (1.50:0.7) (1.460:0.26) no Grupo B. Houve 4 casos de CAL no grupo A em oposição a 88 casos no grupo B, Q2 de CAL no grupo A=0,00, Q2 no grupo B=1,00. IQR=0,00 em ambos os grupos. Valor não significativo p=0. 503(p>0,05) foi observado quando comparada a incidência de baixo nível fetal peso entre os três trimestres. Conclusão:é importante manter uma boa condição periodontal e Estado de higiene bucal em gestantes para maior peso fetal e gravidez mais saudável com menos complicações. (AU)

Prevalence of dental caries, periodontal disease, malocclusion, and tooth wear in indigenous populations in Brazil: a systematic review and meta-analysis

Abstract The aim of this review was to evaluate the prevalence of dental caries, periodontal disease, malocclusion, and tooth wear in indigenous in Brazil. A systematic review of observational studies was performed according to the PRISMA guidelines (CRD42020218704). The search strategy involved the electronic databases of Embase, LILACS, PubMed, Web of Science, Scopus, and the CAPES Theses and Dissertations for gray literature. The eligibility criteria consisted of publications that assessed the prevalence of oral conditions in indigenous populations in Brazil. Studies with indigenous people living in urban area were excluded. The risk of bias was evaluated by using JBI Critical Appraisal for prevalence studies. Thirty studies were included in the review, and the majority showed a low risk of bias. A meta-analysis of 20 studies was conducted using the random-effects model and a 95% confidence interval. Several ethnicities were studied in isolation or in groups (n = 7,627 for dental caries; n = 2,774 for periodontal disease; n = 1,067 for malocclusion; n = 150 for tooth wear). The prevalence of caries ranged from 50% among indigenous people aged 18-36 months to 100% among those aged 65-74 years. The prevalence of periodontal disease ranged from 58% to 83%. The prevalence of malocclusion was 43%. Tooth wear was assessed in only one ethnic group and showed a prevalence of 100% in indigenous people aged >18 years. The certainty of evidence assessed by the GRADE system ranged from very low to moderate. This systematic review showed significant differences in the prevalence of dental caries, periodontal disease and malocclusion between indigenous population groups and territories in which indigenous people live.

Clinical and socio-demographic factors associated with dental extractions in a clinical sample

Abstract The objective of the present study was to identify the reasons for dental extractions in patients seeking dental care in a university dental clinic in Mexico. This is a cross-sectional study that assessed 284 consecutive patients at the School of Dentistry, Autonomous University of the State of Mexico between August 2017 and November 2018. In total, 505 extractions were performed. The dependent variable was the reason for extraction: 0) dental caries and ensuing sequels (reference category); 1) periodontal disease and ensuing sequels; and 2) other reasons. Sociodemographic, socioeconomic, and clinical variables were included as independent variables. The analysis was done with multinomial logistic regression (Stata 14.0). Out of all extractions, 63.6% (n=321) were due to dental caries and ensuing sequels; 22.0% (n=111) were due to periodontal disease and ensuing sequels; 5.3% (n=27) endodontic failure; 5.1% (n=26) prosthetic indications; 1.6% (n=8) orthodontic indications; and the rest (2.4%) were due to other reasons. In the multivariate model extractions due to periodontal disease vs dental caries were associated with occasionally smoking tobacco (Odds Ratio, OR=3.90) or daily tobacco use (OR=3.19); the tooth to be extracted having been previously restored (OR=2.35); extracted anterior as opposed to posterior teeth (OR =2.63); and patients with multiple extractions (OR=2.68). In the case of extractions due to "other reasons", no variable was significant. Dental caries and periodontal disease were the main reasons for dental extraction in this sample. Several variables, mostly clinical, were associated with extractions for periodontal reasons.

Resumo O objetivo do presente estudo foi identificar os motivos das extrações dentárias em pacientes que procuram atendimento odontológico em uma clínica odontológica universitária no México. Este é um estudo transversal que avaliou 284 pacientes consecutivos na Faculdade de Odontologia da Universidad Autónoma del Estado de México entre agosto de 2017 e novembro de 2018. No total, foram realizadas 505 extrações. A variável dependente foi o motivo da extração: 0) cárie dentária e sequelas subsequentes (categoria de referência); 1) doença periodontal e sequelas subsequentes; e 2) outros motivos. Variáveis sociodemográficas, socioeconômicas e clínicas foram incluídas como variáveis independentes. A análise foi feita com regressão logística multinomial (Stata 14.0). De todas as extrações, 63,6% (n=321) foram devidas a cárie dentária e sequelas subsequentes; 22,0% (n=111) foram devidas a doença periodontal e sequelas subsequentes; 5,3% (n=27) a insucesso endodôntico; 5,1% (n=26) a indicações protéticas; 1,6% (n=8) a indicações ortodônticas; e o restante (2,4%) foi devido a outros motivos. No modelo multivariado, as extrações por doença periodontal vs. cárie dentária foram associadas ao tabagismo ocasional (Odds Ratio, OR=3,90) ou ao uso diário de tabaco (OR=3,19); ao fato de o dente a ser extraído ter sido restaurado anteriormente (OR=2,35); à extração de dentes anteriores em vez de posteriores (OR=2,63); e a pacientes com extrações múltiplas (OR=2,68). No caso de extrações devido a "outros motivos", nenhuma variável foi significativa. A cárie dentária e a doença periodontal foram os principais motivos de extração dentária nessa amostra. Diversas variáveis, principalmente clínicas, foram associadas às extrações por motivos periodontais.

Prevalence of periodontitis in young adults living with HIV/Aids using antiretroviral therapy / Prevalência da periodontite em adultos jovens vivendo com HIV/Aids em uso de terapia antirretroviral

ABSTRACT The therapeutic management, as well as the HIV virus itself, has been associated with alterations at the bone level, which may also have a relationship with the maxillomandibular alveolar processes and potential development of periodontal diseases, especially periodontitis. Objective: The objective of this study was to evaluate the periodontal health condition of young adults living with HIV/AIDS, through the measurement of the Periodontal Clinical Insertion Level (CAL) and to raise general data on the health conditions facing HIV and on the quality of life of this audience. Methods: Data were collected at a Reference Center for STI/AIDS in São Paulo - SP, Brazil. The method used was guided by previously validated indicators. In total, 31 individuals aged between 20 and 24 years, both genders and using TAAP were evaluated. For the analyses, the Excel Microsoft® software was used. Results: There was a prevalence of periodontitis in the assessed public of 45.17%. In view of the quality of life, the public was classified as "Regular" and no cases of Necrozing Periodontitis were observed, which is strongly associated with HIV infection. Conclusions: The evaluated public showed a high prevalence of periodontitis, which reinforces the importance of Dentistry in monitoring People Living with HIV/AIDS, in order to prevent the worsening of periodontal diseases.

RESUMO O manejo terapêutico, bem como o próprio vírus do HIV tem sido associados à quadros de alterações em nível ósseo, podendo ter uma relação também com os processos alveolares maxilo-mandibulares e potencial desenvolvimento de quadros de doenças periodontais, em especial a periodontite. Objetivo: O objetivo do trabalho foi avaliar a condição da saúde periodontal de indivíduos adultos jovens vivendo com HIV/AIDS, por meio da aferição do Nível de Inserção Clínica Periodontal e levantar dados gerais sobre as condições de saúde frente ao HIV e sobre a qualidade de vida desse público. Os dados foram coletados em um Centro de Referência em IST/AIDS de São Paulo - SP, Brasil. Métodos: O método empregado teve como guia norteadora indicadores previamente validados. No total, foram avaliados 31 indivíduos com idades entre 20 e 24 anos, ambos os gêneros e em uso da terapia antirretroviral. Para as análises foi utilizado o software Excel Microsoft®. Resultados: Foi observado uma prevalência de periodontite no público avaliado de 45,17%. Frente a qualidade de vida o público foi classificado como "Regular" e não foi observado quadros de Periodontite Necrozante, que está fortemente associado a infecção pelo HIV. Conclusão: O público avaliado apresentou alta prevalência de periodontite, o que reforça a importância da Odontologia no acompanhamento das Pessoas Vivendo com HIV/Aids, no sentido de prevenir o agravamento dos quadros de doenças periodontais.

Exercise improves alveolar bone loss and the inflammatory profile of periodontal disease / El ejercicio mejora la pérdida de hueso alveolar y el perfil inflamatorio de la enfermedad periodontal / O exercício melhora a perda de osso alveolar e o perfil inflamatório da doença periodontal

ABSTRACT Periodontal disease (PD) is an inflammatory oral disease and alveolar bone loss is the most important sign of PD. However, the effects of exercise on inflammatory factors and alveolar bone loss in individuals with PD have been little studied. This meta-analysis assesses the effect of physical exercise on alveolar bone loss (ABL) and the inflammatory profile of PD in animal models. Relevant studies published through July 2020 in PubMed, Medline, Embase and Web of Science were searched after developing a PICOS statement. Quality assessment and risk of bias were analyzed according to the SYRCLE protocol. A total of 52 references were retrieved, 4 of which were considered eligible for inclusion. A total of thirty-four male Wistar rats from the included studies were evaluated for alveolar bone loss and assessed for inflammatory profile. The results indicated that physical exercise could reduce alveolar bone loss (95% CI -2.85 to -0.82, p = 0.002) and the pro-inflammatory tumor necrosis factor-α (TNF-α) in serum or gingival tissue (95% CI -0.45 to -0.24, p < 0.00001). Inversely, exercise increased anti-inflammatory interleukin-10 (IL-10) in serum or gingival tissue (95% CI 0.28 to 0.69, p < 0.00001). However, one study reported a negative result in the expression of TNF-α and IL-10. Current evidence indicates that physical exercise contributes to ameliorate PD by reducing alveolar bone loss and inflammation in animal PD models, which suggests that moderate exercise can be implemented in clinical practice to maintain periodontal health. Level of Evidence I; Systematic Review and Meta-analysis

RESUMEN La enfermedad periodontal (EP) es una enfermedad inflamatoria oral y la pérdida de hueso alveolar es su signo más importante. Sin embargo, los efectos del ejercicio sobre los factores inflamatorios y la pérdida ósea alveolar en individuos con EP han sido poco estudiados. Este meta-análisis evalúa el efecto del ejercicio sobre la pérdida ósea alveolar (POA) y el perfil inflamatorio de la EP en modelos animales. Se llevaron a cabo estudios relevantes publicados hasta julio de 2020 en PubMed, Medline, Embase y Web of Science tras desarrollar la investigación con el método PICO. La evaluación de la calidad y el riesgo de sesgo se analizaron según el protocolo SYRCLE. Se recuperó un total de 52 referencias, cuatro de las cuales se consideraron elegibles para su inclusión. En un total de 34 ratas Wistar macho de los estudios incluidos se evaluó la pérdida de hueso alveolar y el perfil inflamatorio. Los resultados indicaron que el ejercicio puede reducir la pérdida de hueso alveolar (IC del 95%: -2,85 a -0,82; p = 0,002) y el factor de necrosis tumoral proinflamatorio-α (TNFα) en suero o tejido gingival (IC del 95%: -0,45 a -0,24; p < 0,00001). Por el contrario, el ejercicio aumentó la interleucina-10 (IL-10) antiinflamatoria en el suero o en el tejido gingival (IC del 95%: 0,28 a 0,69; p < 0,00001). Sin embargo, un estudio informó de un resultado negativo en la expresión de TNFα e IL-10. Las pruebas actuales indican que el ejercicio contribuye a mejorar la EP al reducir la pérdida de hueso alveolar y la inflamación en modelos animales de EP, lo que sugiere que se puede implementar el ejercicio moderado en la práctica clínica para mantener la salud periodontal. Nivel de Evidencia I; Revisión Sistemática y Meta-análisis.

RESUMO A doença periodontal (DP) é uma doença inflamatória oral e a perda óssea alveolar é seu sinal mais importante. No entanto, os efeitos do exercício sobre os fatores inflamatórios e a perda óssea alveolar em indivíduos com DP têm sido pouco estudados. Esta metanálise avalia o efeito do exercício físico sobre a perda óssea alveolar (POA) e o perfil inflamatório da DP em modelos animais. Estudos relevantes publicados até julho de 2020 em PubMed, Medline, Embase e Web of Science foram pesquisados depois de desenvolver a pesquisa com o método PICO. A avaliação da qualidade e o risco de viés foram analisados de acordo com o protocolo SYRCLE. Um total de 52 referências foram recuperadas, quatro das quais foram consideradas elegíveis para inclusão. Um total de 34 ratos Wistar machos dos estudos incluídos foram avaliados quanto à perda de osso alveolar e avaliados quanto ao perfil inflamatório. Os resultados indicaram que o exercício físico pode reduzir a perda de osso alveolar (IC 95% -2,85 a -0,82, p = 0,002) e o fator de necrose tumoral pró-inflamatório-α (TNFα) no soro ou tecido gengival (IC 95% -0,45 a -0,24, p < 0,00001). Inversamente, o exercício aumentou a interleucina-10 anti-inflamatória (IL-10) no soro ou no tecido gengival (IC 95% 0,28 a 0,69, p < 0,00001). Contudo, um estudo relatou resultado negativo na expressão de TNFα e IL-10. As evidências atuais indicam que o exercício físico contribui para melhorar a DP, reduzindo a perda de osso alveolar e a inflamação em modelos animais de DP, o que sugere que o exercício moderado pode ser implementado na prática clínica para manter a saúde periodontal. Nível de Evidência I; Revisão Sistemática e Metanálise.

Classification of furcation involvement of endodontically treated mandibular first permanent molars based on cone beam CT / 口腔疾病防治

Objective @#To classify the furcation involvement (FI) of endodontically treated mandibular first permanent molars based on cone beam computed tomography (CBCT), provide reference for individualized treatment of FI. @*Methods@#CBCT images of the FI of 164 endodontically treated mandibular first permanent molars from 163 patients in Nanjing Stomatological Hospital, Medical School of Nanjing University were collected retrospectively. On the CBCT images, the shape and extent of periapical and periodontitis bone resorption, the thickness of residual dentin in the pulp floor and root canal wall, and the periodontal bone resorption of the complete dentition were evaluated. The FI was classified into periodontal, periapical, perforated and mixed types.@* Results@#Among the 164 FIs of endodontically treated mandibular first permanent molars, the periapical type was the most common (41.5%), followed by the mixed type (26.2%), perforated type (18.3%), and periodontal type (14.0%). Among the 68 periapical-type FIs of endodontically treated mandibular first permanent molars, 48.5% were proper root canal filling, 44.1% were insufficient filling and 7.4% were overfilling. Among the 43 mixed-type FIs, the periodontal mixed periapical type was the most common (72.1%).@*Conclusion @#Detailed evaluation and classification of furcation involvement could be performed using CBCT images; therefore, the study has guiding significance for clinical treatment.

β-defensinas como posibles indicadores de la actividad inflamatoria en la enfermedad periodontal / β-defensins as possible indicators of inflammatory activity in periodontal disease

Resumen La enfermedad periodontal (gingivitis y periodontitis) es un proceso inflamatorio ocasionado por la actividad de bacterias patógenas y sus productos sobre el surco gingival, con la consecuente activación de la respuesta inmunitaria. La saliva y el fluido crevicular contienen una gran variedad de enzimas y factores antimicrobianos que están en contacto con la región supragingival y subgingival; entre ellos, las β-defensinas (hBDs). Las hBDs son péptidos catiónicos no glicosilados ricos en cisteína, producidos por las células epiteliales; tienen efecto antimicrobiano e inmunorregulador; de esta forma, contribuyen al mantenimiento de la homeostasis en los tejidos periodontales. Los cambios en la microbiota y en la respuesta inmunitaria de un periodonto sano a gingivitis y, finalmente, a periodontitis, es compleja. Su severidad depende de un equilibrio dinámico entre las bacterias asociadas a la placa, factores genéticos y ambientales. Los avances recientes han permitido comprender la implicación de las hBDs en la detección, el diagnóstico y la terapéutica de la enfermedad periodontal, así como la relación que hay entre la periodontitis y otras enfermedades inflamatorias. El objetivo de esta revisión es describir el efecto de las hBDs en la respuesta inmunitaria y su utilización como marcadores de la actividad inflamatoria de la enfermedad periodontal.

Abstract Periodontal disease (gingivitis and periodontitis) is an inflammatory process caused by the activity of pathogenic bacteria and their products on the gingival sulcus, with the consequent activation of the immune response. Saliva and crevicular fluid contain a wide variety of enzymes and antimicrobial factors that are in contact with the supragingival and subgingival region, including β-defensins (hBDs). hHBDs are non-glycosylated, cysteine-rich cationic peptides produced by epithelial cells with antimicrobial and immunoregulatory effects, thus contributing to maintaining homeostasis in periodontal tissues. The changes in the microbiota and the immune response from a healthy periodontium to gingivitis and, finally, to periodontitis are complex. Their severity depends on a dynamic balance between bacteria associated with plaque, genetic and environmental factors. Recent advances have made it possible to understand the implication of hBDs in the detection, diagnosis, and therapy of periodontal disease and the relationship between periodontitis and other inflammatory conditions. This review aims to describe the effect of hBDs on the immune response and its use as a possible marker of the inflammatory activity of the periodontal disease.

Efeitos da nanopartícula de ácido poli lático-co-glicólico (PLGA) associada ao cloridrato de metformina na doença periodontal em ratos diabéticos / Effects of polylactic-co-glycolic acid (PLGA) nanoparticle associated with metformin hydrochloride on periodontal disease in diabetic rats

Existe uma associação entre diabetes e a periodontite, e a Metformina (MET) além de controlar os níveis glicêmicos, tem apresentado efeitos antiinflamatórios e na diminuição da perda óssea periodontal. Ao se veicular a MET a um sistema de nanopartículas pode-se apresentar a vantagem de aumento da eficácia terapêutica. Objetivos: esse estudo consistiu na avaliação dos efeitos antiinflamatórios, perda óssea e disponibilidade in vitro/in vivo de uma nanopartícula de ácido poli lático-co-glicólico (PLGA) associada à MET em um modelo de periodontite induzida por ligadura. Materiais e métodos: o PLGA carreado com diferentes doses da MET foi caracterizado pelo seu diâmetro médio, tamanho da partícula, índice de polidispensão e eficiência de aprisionamento. Foram utilizados ratos machos da linhagem Wistar, divididos aleatoriamente, em grupos controles e experimentais com diferentes doses de MET associadas ou não ao PLGA, os quais receberam diferentes tratamentos. Amostras de maxilas e tecidos gengivais foram utilizadas para avaliação de perda óssea e inflamação, por meio da microtomografia computadorizada, histopatológico, imunohistoquímica, análise de citocinas inflamatórias e expressão gênica de proteínas por RT-PCR quantitativo. Para o ensaio de liberação in vitro, utilizou-se o dispositivo de células de difusão vertical de Franz estáticas. Para a disponibilidade in vivo, as amostras de sangue foram coletadas em diferentes intervalos de tempo e analisadas por cromatografia líquida de alta eficiência acoplado a espectrometria de massas (HPLC-MS/MS). Resultados: o diâmetro médio das nanopartículas de PLGA carreadas com MET estava em um intervalo de 457,1 ± 48,9 nm (p <0,05) com um índice de polidispersidade de 0,285 (p <0,05), potencial Z de 8,16 ± 1,1 mV (p <0,01) e eficiência de aprisionamento (EE) de 66,7 ± 3,73. O tratamento com a MET 10 mg / kg + PLGA mostrou uma baixa concentração de células inflamatórias, fraca imunomarcação para RANKL, Catepsina K, OPG e osteocalcina. Diminuição dos níveis de IL-1ß e TNF-α (p <0,05), aumento da expressão gênica do AMPK (p <0,05) e diminuição do NF-κB p65, HMGB1 e TAK-1 (p <0,05). O 10 mg/kg MET + PLGA foi liberado no ensaio in vitro sugerindo um modelo cinético de difusão parabólica com um perfil de liberação que atinge 50% de seu conteúdo em 2h e permanece em liberação constante em torno de 60% até o final de 6h. O ensaio in vivo mostrou o volume aparente de distribuição Vz/F (10 mg/kg MET + PLGA, 46,31 mL/kg vs. 100 mg/kg MET + PLGA, 28,8 mL/kg) e o tempo médio de residência MRTinf (PLGA + MET 10 mg /kg, 37,66h vs. MET 100 mg/kg, 3,34h). Conclusão: o PLGA carreado com MET diminuiu a inflamação e a perda óssea na periodontite em ratos diabéticos. O 10 mg/kg MET + PLGA teve uma taxa de eliminação mais lenta em comparação com o MET 100 mg/kg. A formulação modifica os parâmetros farmacocinéticos, como volume de distribuição aparente e tempo médio de residência (AU).

There is an association between diabetes and periodontitis, and Metformin (MET) in addition to controlling glycemic levels, has shown anti-inflammatory effects and decreased periodontal bone loss. By transferring MET to a nanoparticle system, the advantage of increasing therapeutic efficacy can be presented. Objectives: this study consisted of evaluating the antiinflammatory effects, bone loss and in vitro/in vivo availability of a polylactic-co-glycolic acid (PLGA) nanoparticle associated with MET in a ligature-induced periodontitis model. Materials and methods: PLGA loaded with different doses of MET was characterized by its mean diameter, particle size, polydispension index and entrapment efficiency. Male Wistar rats were used, randomly divided into control and experimental groups with different doses of MET associated or not with PLGA, which received different treatments. Samples of jaws and gingival tissues were used to assess bone loss and inflammation, using computed microtomography, histopathology, immunohistochemistry, analysis of inflammatory cytokines and gene expression of proteins by quantitative RT-PCR. For the in vitro release assay, the static Franz vertical diffusion cell device was used. For in vivo availability, blood samples were collected at different time intervals and analyzed by high performance liquid chromatography coupled with mass spectrometry (HPLC-MS/MS). Results: the mean diameter of MET-loaded PLGA nanoparticles was in the range of 457.1 ± 48.9 nm (p <0.05) with a polydispersity index of 0.285 (p <0.05), Z potential of 8.16 ± 1.1 mV (p <0.01) and trapping efficiency (EE) of 66.7 ± 3.73. Treatment with MET 10 mg/kg + PLGA showed a low concentration of inflammatory cells, weak immunostaining for RANKL, Cathepsin K, OPG and osteocalcin. Decreased IL-1ß and TNF-α levels (p <0.05), increased AMPK gene expression (p <0.05) and decreased NF-κB p65, HMGB1 and TAK-1 (p <0. 05). The 10 mg/kg MET + PLGA was released in the in vitro assay suggesting a kinetic model of parabolic diffusion with a release profile that reaches 50% of its content in 2h and remains in constant release around 60% until the end of 6h . The in vivo assay showed the apparent volume of distribution Vz/F (10 mg/kg MET + PLGA, 46.31 mL/kg vs. 100 mg/kg MET + PLGA, 28.8 mL/kg) and the mean MRTinf residency (PLGA + MET 10 mg/kg, 37.66h vs. MET 100 mg/kg, 3.34h). Conclusion: MET-loaded PLGA decreased inflammation and bone loss in periodontitis in diabetic rats. 10 mg/kg MET + PLGA had a slower rate of elimination compared to 100 mg/kg MET. The formulation modifies pharmacokinetic parameters such as apparent volume of distribution and mean residence time (AU).