Frecuencia de enfermedades periodontales y características clínicas de pacientes atendidos en la Cátedra de Periodoncia de la Universidad Autónoma de Asunción

Las enfermedades periodontales son consideradas entre las más comunes entre las patologías bucales. Su frecuencia es cada vez más elevada en la población y existen varias patologías sistémicas y hábitos que empeoran su cuadro clínico. El objetivo de este trabajo fue determinar la frecuencia y características clínicas de pacientes con enfermedades periodontales que acuden a la cátedra de periodoncia en la Universidad Autónoma de Asunción en el período de 2011 al 2019. Estudio Observacional, descriptivo, retrospectivo, se procesaron 477 fichas clínicas de pacientes de la cátedra de Periodoncia de la Universidad Autónoma de Asunción desde el año 2011 al 2019. El tipo de muestreo utilizado fue no probabilístico por conveniencia. De las 477 fichas solo se analizaron 317 pacientes que cumplieron con los criterios de inclusión. Fueron el 56.46 % de sexo femenino y 43,53 % de sexo masculino, la mediana de edad fue de 33 (23-48) años. El 53% los pacientes presentaban periodontitis crónica y comorbilidades como diabetes e hipertensión arterial. Solo el 11,9 % fueron fumadores. En cuanto a los pacientes diabéticos la mayoría eran de sexo femenino y de edad avanzada, presentando como diagnóstico más frecuente la periodontitis crónica. El diagnóstico clínico más frecuente de la población estudiada fue la periodontitis crónica, seguido por la gingivitis.

Periodontal diseases are considered among the most common among oral pathologies. Its frequency is increasingly higher in the population and there are several systemic pathologies and habits that worsen its clinical condition. The objective of this work was to determine the frequency and clinical characteristics of patients with periodontal diseases who attend the periodontics department at the Autonomous University of Asunción in the period from 2011 to 2019. Observational, descriptive, retrospective study, 477 clinical records were processed. of patients from the Department of Periodontics at the Autonomous University of Asunción from 2011 to 2019. The type of sampling used was non-probabilistic for convenience. Of the 477 records, only 317 patients who met the inclusion criteria were analyzed. They were 56.46% female and 43.53% male, the median age was 33 (23-48) years. 53% of the patients had chronic periodontitis and comorbidities such as diabetes and high blood pressure. Only 11.9% were smokers. Regarding diabetic patients, the majority were female and elderly, with chronic periodontitis as the most frequent diagnosis. The most frequent clinical diagnosis of the studied population was chronic periodontitis, followed by gingivitis.

Evaluation of characteristics of periodontal probes

Aim: This study aimed to evaluate the millimeter distances and active tip diameters of different periodontal probes. Methods: Two types of periodontal probes were analyzed (North Carolina (15-UNC) and PCP-12). Two manufacturers were selected for each probe type. Digital images of the probes were obtained and the distances were measured using a software program. The diameter of the active tip was measured using a digital caliper. Both variables were measured by two trained and calibrated examiners. The data were analyzed using the Bland-Altman method and two-way ANOVA with Tukey's post-hoc test. Statistical significance was set at p<0.05. Results: A comparison of measurements between the 15UNC and PCP-12 probes showed a significant difference in all millimeter markings. The 15-UNC probe showed differences between the 3 and 12 mm markings. The PCP-12 probe only showed differences between the marks at the 12 mm mark. The 15-UNC probe had a similar active tip diameter between the two manufacturers. The PCP-12 probe showed a significant difference between the two manufacturers. Both types of probes had similar active tip diameters when compared by the two manufacturers. Conclusion: There was no standardization in relation to millimeter marks and tip diameters of the two types of periodontal probes produced by the two different manufacturers. The probe types exhibited little variability

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.

Clinical and radiographic evaluation of Bio-Oss granules and Bio-Oss Collagen in the treatment of periodontal intrabony defects: a retrospective cohort study

Abstract Objective This retrospective study aimed to analyze the clinical efficacy of two regenerative surgical methods — Bio-Oss granules combined with barrier membranes and Bio-Oss Collagen alone — and to help clinicians achieve better periodontal regeneration outcomes in the specific periodontal condition. Methodology Patients who underwent periodontal regeneration surgery from January 2018 to April 2022 were retrospectively screened, and their clinical and radiographic outcomes at 6 months postoperatively were analyzed. The probing depth (PD), clinical attachment level (CAL), bleeding on probing (BOP), gingival recession (GR), distance from the cemento-enamel junction to the bottom of the bone defect (CEJ-BD), and depth of intrabony defects (INFRA) were recorded before the operation (T0) and 6 months after it (T1), and subsequently compared. Results In total, 143 patients were included — 77 were placed in the Bio-Oss group and 66 were placed in the Bio-Oss Collagen group. All indicators, including PD and CAL at T1, showed significant differences compared to baseline, for both groups (P<0.001). PD reduction was greater in the group receiving the Bio-Oss Collagen treatment (P=0.042). Furthermore, in cases when the baseline PD range was 7-11 mm and the age range was 35-50 years, PD reduction was more significant for patients receiving the Bio-Oss Collagen treatment (P=0.031, 0.023). A linear regression analysis indicated that postoperative PD and CAL were positively correlated with baseline values, and that the efficacy tended to decrease with increasing age. Conclusion Both the use of Bio-Oss Collagen alone and the use of Bio-Oss granules combined with barrier membranes resulted in significant effects in the treatment of periodontal intrabony defects. The Bio-Oss Collagen treatment generated more improvements in PD than the Bio-Oss granules combined with barrier membranes, particularly within the baseline PD range of 7-11 mm and the 35-50 years age group. Additionally, age was the main factor influencing the effectiveness of regenerative surgery for intrabony defects: older individuals exhibited fewer improvements.

Research progress on cemental tears in terms of clinical diagnosis and treatment / 口腔疾病防治

@#A cemental tear is defined as an incomplete or complete detachment of the cementum along the dentino-cemental junction (CDJ) or the incremental line within the body of the cementum, which can also involve part of the root dentine adjacent to the cementum. The pathogenesis of cemental tears is not fully elucidated. From the literature review, possible predisposing factors were identified, including tooth type, sex, age, periodontitis, previous periodontal treatment or root canal treatment, history of dental trauma, and occlusal trauma or excessive occlusal force. The morphology of cemental tears can be either piece-shaped or U-shaped, which usually contributes to periodontal and periapical breakdown. Clinically, cemental tears have a unitary periodontal pocket and present with symptoms mimicking localized periodontitis, apical periodontitis, and vertical root fractures. Imaging examination is of great significance for the clinical diagnosis of cemental tears, which often manifest as thin ‘prickle-like’ radiopaque masses located longitudinally adjacent to the affected root surface. Exploratory surgery is needed in some cases. Although intraoperative cemental fragments and cemental lines on the root surface can assist in the diagnostic process, histopathology examination is the gold standard for the diagnosis of cemental tears. The treatment methods vary depending on the timing of the correct diagnosis and the clinical or radiological manifestations. With the development of regenerative biomaterials and the development of intentional replantation, an increasing number of affected teeth can survive for a long time. The aim of this review is to systematically describe the biological basis and predisposing factors, clinical features, radiographic and histological characteristics, diagnosis and clinical management of cemental tears, and treatment outcomes to help make a clear diagnosis and develop a personalized treatment plan.

Research progress on immunomodulatory properties of periodontal ligament stem cells / 口腔疾病防治

@#Periodontal ligament stem cells (PDLSCs) have the potential for multidirectional differentiation and are the preferred seed cells for periodontal tissue regeneration. In recent years, a large number of studies have confirmed that PDLSCs also possess broad immunomodulatory properties. Therefore, in-depth exploration of their specific molecular mechanisms is of great significance for the treatment of periodontitis. The aim of this paper is to summarize the research progress on the regulation of PDLSCs on various immune cells and the effect of the inflammatory environment on the immune characteristics of PDLSCs to provide an important theoretical basis for the allotransplantation of PDLSCs and improve the therapeutic effect of periodontal tissue regeneration. Studies have shown that PDLSCs possess a certain degree of immunosuppressive effect on both innate and acquired immune cells, and inflammatory stimulation may lead to the impairment of the immunoregulatory properties of PDLSCs. However, current studies are mainly limited to in vitro cell tests and lack in-depth studies on the immunomodulatory effects of PDLSCs in vivo. In vivo studies based on cell lineage tracing and conditional gene knockout technology may become the main directions for future research.

Clinical efficacy of periodontal endoscopy-assisted subgingival scaling and root planning and its effect on psychology and quality of life in patients with periodontitis / 口腔疾病防治

Objective@#To investigate the clinical efficacy and effects of periodontal endoscope (PE)-assisted subgingival scaling and root planning (SRP) and traditional SRP on the psychological and quality of life of patients with periodontitis.@*Methods@#This study was reviewed and approved by the Ethics Committee, and informed consent was obtained from the patients. Patients with periodontitis who were treated in the Department of Periodontology, Nanjing Stomatological Hospital, Medical School of Nanjing University from April 2018 to December 2022 with residual periodontal pockets (PD ≥ 5 mm) 6 weeks after traditional SRP treatment were enrolled, and the residual periodontal pockets were further treated with PE-assisted SRP (PE+SRP). After 6 weeks of traditional SRP treatment and 3 months of PE+SRP treatment, clinical indicators, including plaque index (PLI), probing depth (PD), clinical attachment loss (CAL) and bleeding on probing (BOP), were measured, and periodontal tissue self-awareness scale scores, oral health impact profile-14 (OHIP-14) score and dental fear scale (DFS) score were collected. Moreover, visual analog scale (VAS) scores were collected after traditional SRP and PE-assisted SRP treatments.@*Results@#Twenty-three patients with periodontitis, including 832 sites of 486 affected teeth, were included in the clinical study. Three months after PE+SRP treatment, all clinical periodontal indicators, PLI (t = 9.254, P<0.001), PD (t = 50.724, P<0.001), CAL (t = 22.407, P<0.001) and BOP (t = 9.217, P<0.001), were significantly improved. Compared with traditional SRP (VAS: 2.48 ± 1.70), the pain caused by PE+SRP (VAS: 2.57±1.80) was not significantly different (t = 0,192, P = 0.850). There was no significant difference in the scores of the periodontal tissue self-awareness scale between the two groups (t = 1.485, P = 0.152). The OHIP-14 (SRP: 12.13±7.63; PE+SRP: 10.26 ± 5.25, t = -1.589, P = 0.126) and DFS (SRP: 40.70 ± 12.63; SRP+PE: 41.57 ± 12.61, t = 0.404, P = 0.690) scores were not significantly different.@*Conclusion@#All clinical periodontal indicators were significantly improved after PE-assisted SRP treatment of residual periodontal pockets, and compared with traditional SRP, PE-assisted SRP had no negative impact on the quality of life or psychological status of patients with periodontitis. Therefore, PE+SRP can be promoted in clinical practice.

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.

Membrana de fibrina rica en plaquetas asociada al colgajo de reposición coronal tres años después

Fundamento la asociación de la membrana de fibrina rica en plaquetas con el colgajo de reposición coronal constituye una modalidad de la ingeniería de tejidos que aporta elementos regenerativos al proceso de reparación tisular. Objetivo evaluar la efectividad de la membrana de fibrina rica en plaquetas asociada al colgajo de reposición coronal en el tratamiento de la recesión periodontal tres años después. Métodos se realizó un cuasiexperimento en la facultad de Estomatología de Villa Clara, en el periodo marzo de 2017-julio de 2020, y con una población de estudio conformada por 46 pacientes portadores de recesión periodontal, quienes requerían recubrimiento radicular mediante el colgajo de reposición coronal. Se utilizó un muestreo no probabilístico intencional por criterios, y la muestra quedó conformada por 26 pacientes. Se establecieron sitios de estudio y sitios de control. Las variables estudiadas fueron: edad, sexo, largo de la recesión, clasificación de Miller, cobertura radicular, ancho y ganancia de la encía insertada, categorías de evaluación y efectividad del tratamiento. Resultados en el 88,68 % de los dientes ubicados en los sitios de estudio predominó la categoría de evaluación favorable. El porcentaje de efectividad a los tres años de la terapéutica fue superior en los sitios de estudio (54,71 %). Conclusiones se consideró más efectivo el tratamiento de la recesión periodontal con membrana de fibrina rica en plaquetas asociada al colgajo de reposición coronal a los tres años del proceder.

Foundation the association of the platelet-rich fibrin membrane with the coronal replacement flap constitutes a modality of tissue engineering that provides regenerative elements to the tissue repair process. Objective to evaluate the effectiveness of the platelet-rich fibrin membrane associated with the coronal repositioning flap in the treatment of periodontal recession three years later. Methods a quasi-experiment was carried out at the Villa Clara Dentistry Faculty, from March 2017 to July 2020, a study population of 46 patients with periodontal recession, who required root coverage using the replacement flap coronal. Intentional non-probabilistic sampling by criteria was used, and the sample of 26 patients. Study sites and control sites were established. The studied variables were: age, sex, recession length, Miller classification, root coverage, width and gain of the attached gingiva, evaluation categories and treatment effectiveness. Results in 88.68% of the teeth located in the study sites, the favorable evaluation category predominated. The effectiveness percentage three years after treatment was higher in the study sites (54.71%). Conclusions the treatment of periodontal recession with platelet-rich fibrin membrane associated with the coronal replacement flap was considered more effective three years after the procedure.

Uso de L-PRF en defectos infraóseos de pacientes con estadios avanzados de periodontitis / Use of L-PRF in intrabone defects in patients with advanced stages of periodontitis

Objetivo: El propósito de este estudio fue observar el efecto del uso de L-PRF en defectos infraoseos de pacientes con periodontitis en estadios avanzados. Métodos: Se incluyeron 32 defectos infraoseos de 12 pacientes con diagnóstico de Periodontitis estadio III y IV (Workshop 2018). Se realizó raspaje a campo abierto con colocación de membrana de L-PRF. Se incluyeron defectos infraóseos de 1-2-3 paredes y cráter óseo. Se registró la profundidad de sondaje (PS), nivel de inserción clínica (NIC), índice de placa (IP) e índice de sangrado (IS). Se realizaron radiografías periapicale digitales antes de la cirugía y al cuarto mes para observar el llenado óseo. Resultados: De los 32 defectos el 75 % mostró disminución de la profundidad de sondaje (PS) y el 66 % mejoro el nivel de inserción clínica (NIC). Se realizó un análisis de correlación pre y posquirúrgico en PS: MV (p = 0,02), MP/L (p = 0,00), DP/L (p = 0,00) y V (p =0,00). El porcentaje de llenado óseo fue de 62,96 % (DS± 3,88). Conclusiones: La mayoría de los defectos infraóseos mostraron radiográficamente llenado óseo parcial o total con el uso de membranas L-PRF. Además, se mejoraron los parámetros clínicos de profundidad de sondaje y nivel de inserción clínica.

Objective: The purpose of this study was to observe the effect of L-PRF (Leuko- cyte-Platelet Rich Fibrin) usage in intraosseous defects in patients with advanced-stages of periodontitis. Methods: Thirty-two intraosseous defects in 12 patients diagnosed with stage III and IV periodontitis (Workshop 2018) were included in the study. Open flap debridement was performed with the placement of L-PRF membranes. Included defects consisted of 1-2-3 wall defects and osseous craters. Parameters such as probing depth (PD), clinical attachment level (CAL), plaque index (PI), and bleeding index (BI) were recorded. Digital periapical radiographs were taken before surgery and at the fourth month to assess bone fill. Results: Out of the 32 defects, 75% showed a reduction in probing depth (PD), and 66% showed improvement in clinical attachment level (CAL). Pre- and post-surgical correlation analysis was performed for PD: MV (p = 0.02), PI/L (p = 0.00), BI/L (p = 0.00), and CAL (p = 0.00). The percentage of bone fill was 62.96% (±3.88 SD). Conclusion: The majority of intraosseous defects exhibited partial or complete radiographic bone fill with the use of L-PRF membranes. Furthermore, clinical parameters such as probing depth and clinical attachment level improved.

Calidad de vida relacionada con enfermedad periodontal en pacientes diabéticos del régimen subsidiado de Manizales

Introducción: la calidad de vida relacionada con la salud bucal es un tema relevante que involucra la relación de la odontología con las enfermedades crónicas no transmisibles como la diabetes, dada su relación bidireccional. En este trabajo se resalta la importancia de revisar el impacto que generan las alteraciones periodontales en la calidad de vida de pacientes diabéticos. El objetivo de este estudio fue establecer la calidad de vida relacionada con el estado periodontal en pacientes diabéticos pertenecientes al régimen subsidiado de Manizales. Métodos: se observaron 90 adultos diabéticos pertenecientes al programa de diabetes del régimen subsidiado mediante entrevista estructurada, aplicación del instrumento OHIP-14 (Perfil de Impacto de la Salud Oral en la Calidad de Vida) y observación directa del estado periodontal, con el fin establecer el índice de extensión y severidad periodontal, descripción del índice OHIP-14, establecer su relación con variables sociodemográficas y con el estado de salud periodontal. Resultados: se encontró una prevalencia de impacto según el OHIP-14 del 44,4%, extensión del impacto con un promedio de 1,58 (IC: 1,0-2,1) y una severidad del impacto de 6,7 (IC: 6,2-7,8). Al consolidar los resultados del OHIP-14 por dimensión, se observó que el mayor impacto correspondió a la dimensión de dolor físico, con un porcentaje del 81,1%. El menor porcentaje se presentó en las dimensiones de Incapacidad Social y Discapacidad o Minusvalía con un 34,4%. Conclusiones: aunque en la población estudiada, la presencia de enfermedad periodontal ejerció pobre impacto en calidad de vida, éste fue mayor en las dimensiones de impacto de dolor físico y malestar psicológico.

Introduction: quality of life related to oral health is a relevant topic that involves the relationship of dentistry with chronic noncommunicable diseases such as diabetes, given its bidirectional relationship. This study emphasizes the importance of reviewing the impact of periodontal alterations on the quality of life of diabetic patients. The objective of this study was to establish the quality of life related to periodontal status in diabetic patients belonging to the subsidized regime of Manizales. Methods: 90 diabetic adults belonging to the diabetes program of the subsidized regime were observed by means of a structured interview, application of the OHIP-14 instrument (Oral Health Impact Profile on Quality of Life) and direct observation of periodontal status, to establish the index of periodontal extension and severity, description of the OHIP-14 index, establish its relationship with sociodemographic variables and with periodontal health status. Results: we found a prevalence of impaction according to OHIP-14 of 44.4%, extent of impaction with an average of 1.58 (CI: 1.0-2.1) and severity of impaction of 6.7 (CI: 6.2-7.8). When consolidating the OHIP-14 results by dimension, it was observed that the greatest impact corresponded to the physical pain dimension, with a percentage of 81.1%. The lowest percentage was presented in the dimensions of Social Incapacity and Disability or Handicap with 34.4%. Conclusions: although in the population studied, the presence of periodontal disease had a poor impact on quality of life, this was greater in the dimensions of physical pain and psychological discomfort.

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.

Efecto Antibacteriano del Extracto Etanólico de Equisetum giganteum L. "Cola de Caballo" Frente al Fusobacterium nucleatum, Microorganismo Asociado a la Enfermedad Periodontal

La fitoterapia aplicada a la Odontología se presenta como una eficaz alternativa de tratamiento frente a las enfermedades periodontales (EP) porque busca utilizar los principios activos de las plantas medicinales que se encuentran en gran cantidad en la naturaleza, dándole así las características de ser más asequibles y de menor costo, para combatir los microorganismos patógenos causantes de las EP. El objetivo del estudio fue determinar el efecto antibacteriano in vitro del extracto etanólico de Equisetum giganteum L. frente a cepas ATCC de Fusobacterium nucleatum. El estudio fue de tipo experimental no probabilístico y estuvo constituido en total por 10 placas Petri sembradas con F. nucleatum. Se utilizó extracto etanólico de E. giganteum L. en las concentraciones de 100, 50, 25, 12.5 y 6.25 %. Se utilizó el método de difusión en agar y se incubaron 10 placas a 37 °C durante 07 días. Se midieron los halos de inhibición con un vernier digital, siendo estos datos posteriormente analizados. No se evidenciaron halos de inhibición significativos en ninguno de los discos embebidos con las diferentes concentraciones en las 10 placas Petri sembradas con F. nucleatum, pero sin con la clorhexidina, agente química utilizado como control positivo. En conclusión no se determinó un efecto antibacteriano in vitro del extracto etanólico de E. giganteum L. frente a F. nucleatum, en ninguna de sus concentraciones.

Phytotherapy applied to Dentistry is presented as an effective alternative treatment against periodontal diseases (PD) because it seeks to use the active ingredients of medicinal plants that are found in large quantities in nature, thus giving it the characteristics of being more affordable. and at a lower cost, to combat the pathogenic microorganisms that cause PE. Objective: to determine the in vitro antibacterial effect of the ethanolic extract of Equisetum giganteum L. against ATCC strains of Fusobacterium nucleatum. Material and methods: The study was of a non- probabilistic experimental type and consisted of a total of 10 Petri dishes seeded with F. nucleatum. Ethanolic extract of E. giganteum L. was used in concentrations of 100, 50, 25, 12.5 and 6.25 %. The agar diffusion method was used and 10 plates were incubated at 37 °C for 07 days. The inhibition halos were measured with a digital vernier, and these data were subsequently analyzed. Results: No significant inhibition halos were found in any of the embedded disks with the different concentrations in the 10 Petri dishes seeded with F. nucleatum, but without chlorhexidine, the chemical agent used as a positive control. Conclusions: an in vitro antibacterial effect of the ethanolic extract of E. giganteum L. was not determined against F. nucleatum, in any of its concentrations.

Diabetes tipo II. A terapia periodontal não cirúrgica pode favorecer o controle glicêmico do paciente? / Type II Diabetes. Does nonsurgical periodontal therapy improve glycemic control in patientes? / Diabetes tipo II. ¿Puede la terapia periodontal no quirúrgica mejorar el control glicémico del paciente?

Introdução:A doença periodontal corresponde àcondição que acomete os tecidos de proteção e/ou suporte do dente através de uma inflamação crônica causadapor patógenos.Estacondição pode ser modificada ou associada às doenças sistêmicas, como por exemplo, o diabetes mellitus tipo II (DM2).Objetivo:Avaliar quais os efeitos da terapia periodontal não cirúrgica sobre o controle glicêmico de pacientes diagnosticados com DM2.Metodologia:Revisão integrativa elaborada a partir de pesquisas clínicas randomizadas indexadas nas bases de dados Pubmed, Embase, Cochrane, Web of Science e BVS, na qual foram utilizados os descritores "periodontal diseases treatment", "glycemic control" e "metabolic control".Resultados:Dos trabalhos avaliados, seis foram selecionados para compor a revisão, tendo em vista os critérios de inclusão e exclusão estabelecidos. Logo, é notório que a terapia periodontal básica indica melhora no controle glicêmico dos pacientes com DM2, de acordo comanálise da HbA1c e PCR,portanto, com base nos resultados dessa pesquisa, o tratamento periodontal não cirúrgico parece contribuir para o controle metabólico. Apesar disso, alguns estudos se opõem aoresultadodo controle glicêmicodesses pacientes, reforçando a existência de variáveis que interferem nos resultados da pesquisa, como os níveis de hemoglobina, estágio da doença periodontal, amostra, dietae atividade física dos pacientes.Conclusões:O resultado deverá ser avaliado com maior cautela, tendo em vista as possibilidades de variáveis presentes nesse tipo de pesquisa. Por fim, ensaios controlados devem ser realizados para alcançar um maior esclarecimento a respeito dos efeitos da terapia periodontal não cirúrgica no controle glicêmico de pacientes com DM2 (AU).

Introduction:Periodontal disease is a condition in which protective or supportive tissues of the tooth are affected by chronic inflammation caused by pathogens. This condition may be modified or associated with systemic diseases such as type 2 diabetes mellitus (T2DM).Objective:To evaluate the effects of nonsurgical periodontal therapy on glycemic control in patients diagnosed with T2DM. Methodology:An integrative review was performed using randomized clinical trials indexed in PubMed, Embase, Cochrane, Web of Science, and BVS databases. The descriptors "periodontal disease treatment," "glycemic control," and "metabolic control" were used. Results:From the reviewed studies, six were selected for the review considering the established inclusion and exclusion criteria.Basic periodontal therapy improves glycemic control in patients with T2DM, as evidenced by analysis of glycated hemoglobin (HbA1c) and polymerase chain reaction (PCR). Therefore, based on the results of this research, nonsurgical periodontal treatment contributes to metabolic control. However, some studies contradict the effect of glycemic control in these patients, reinforcing the presence of variables that interfere with research results, such as hemoglobin levels, stage of periodontal disease, sample, dietand physical activity of patients. Conclusions:The results should be evaluated with more caution considering the potential variables present in this type of research. Finally, controlled trials should be conducted to understand better the effects of nonsurgical periodontal therapy on glycemic control in patients with T2DM (AU).

Introducción: La enfermedad periodontal es una condición en la cual los tejidos protectores o de soportedel diente se ven afectados por una inflamación crónica causada por patógenos. Esta condición puede modificarse o asociarse a enfermedades sistémicas como la diabetes mellitus tipo 2 (DM2). Objetivo: Evaluar los efectos de la terapia periodontal no quirúrgica en el control glucémico en pacientes diagnosticados con DM2. Metodología: Se realizó una revisión integradora utilizando ensayos clínicos aleatorizados indexados en las bases de datos de PubMed, Embase, Cochrane, Web of Science y BVS. Se utilizaron los descriptores "tratamiento de enfermedades periodontales", "control glucémico" y "control metabólico". Resultados: De los estudios revisados, se seleccionaron seis para la revisión, considerando los criterios de inclusión y exclusión establecidos. La terapia periodontal básica mejora el control glucémico en pacientes con DM2, como se evidencia en el análisis de la hemoglobina glicosilada (HbA1c) y la reacción en cadena de la polimerasa (PCR). Por lo tanto, basándose en los resultados de esta investigación, el tratamiento periodontal no quirúrgico contribuye al control metabólico. Sin embargo, algunos estudios contradicen el efecto del control glucémico en estos pacientes, lo que refuerza la presencia de variables que interfieren en los resultados de la investigación, como los niveles de hemoglobina, el estadio de la enfermedad periodontal, la muestra, la dieta y la actividad física de los pacientes. Conclusiones: Los resultados deben evaluarse con mayor precaución, considerando las posibles variables presentes en este tipo de investigación. Por último, se deben realizar ensayos controlados para comprender mejor los efectos de la terapia periodontal no quirúrgica en el control glucémico en pacientes con DM2 (AU).

Recubrimiento radicular de recesiones gingivales con matriz dérmica acelular / Root coverage of gingival recession with acellular dermal matrix

La recesión gingival es considerada como una deformidad o condición mucogingival, la Academia Americana de Periodontología, define a la recesión gingival como el desplazamiento del margen del tejido blando apical a la unión cemento-esmalte con la exposición de la superficie radicular. El tratamiento de las recesiones gingivales es un motivo de consulta común debido a razones estéticas, hipersensibilidad dentinaria, molestias durante el cepillado e incluso temor a la pérdida dentaria. Es una situación clínica común, 60% de la población humana tiene algún tipo de recesión gingival. Al realizar el examen clínico a paciente masculino de 55 años, se observó una recesión gingival tipo 1 (RT1) sin pérdida de inserción interproximal de la clasificación de Cairo. Se realizó el colgajo posicionado coronalmente (CPC) utilizando una matriz dérmica acelular (MDA) de origen humano OrACELL®. Se obtuvo resultado favorable en el recubrimiento de recesiones gingivales múltiples; considerándolos como una buena alternativa frente a los injertos gingivales autógenos. Concluyendo que, el uso de la matriz dérmica acelular para el tratamiento de la recesión gingival tipo 1 es una adecuada opción para el recubrimiento radicular. Se recomiendan más estudios a largo plazo para ver la estabilidad de los resultados obtenidos con la MDA (AU)

Gingival recession, considered a deformity or mucogingival condition, the American Academy of Periodontology, defines gingival recession as the exposure of the root surface resulting from migration of the gingival margin apical to the cementoenamel junction (CEJ). The treatment of gingival recessions is a common reason for consultation due to aesthetic reasons, dentin hypersensitivity, discomfort during brushing and even fear of tooth loss. It is a common clinical situation, 60% of the human population has some kind of gingival recession. Clinical examination of a 55-year-old male patient showed a type 1 gingival recession (RT1) without loss of interproximal insertion of the Cairo classification. Coronally advanced flap (CAF) was performed using an acellular dermal matrix (ADM) of human origin OrACELL®. Favorable results were obtained in the coating of multiple gingival recessions; considering them as a good alternative to autogenous gingival grafts. Concluding that, the use of the acellular dermal matrix for the treatment of gingival recession type 1, is a suitable option for root lining. Further long-term studies are recommended to see the elasticity of MDA outcomes (AU)

Unvaccinated periodontal patients with a history of COVID-19: clinical findings in a Dental School setting

Abstract This study analyzed the periodontal clinical data of individuals with a history of COVID-19 treated in a dental school during the pandemic in 2021 before vaccination. Methods: This analysis included individuals older than 18 years with no history of systemic disorders other than systemic arterial hypertension. Individuals who had COVID-19 were classified according to the World Health Organization as asymptomatic, with mild, moderate, severe, or critical symptoms. Results: A total of 95 individuals were evaluated, which included 24 with a history of COVID-19. Seventeen percent had been asymptomatic, 21% had mild, 25% moderate, 21% severe, and 17% critical symptoms, including intubation. Individuals with no history of COVID-19 presented significantly lower measurements of probing depth (p=0.003; Mann-Whitney test) and clinical attachment level (p=0.002) compared to individuals with a history of COVID-19. A significant negative association was found between bleeding on probing and the severity of characteristics of COVID-19 (rho= -0.233; p=0.023). Conversely, positive associations between the values of probing depth (rho= 0.292; p=0.004) and mean clinical attachment level (rho= 0.300; p=0.003) and the characteristics of COVID-19 were found. Conclusions: The periodontal data shows that patients who had COVID-19 before vaccination may present a worse periodontal status when compared to patients in the same clinical setting with no history of COVID-19. However, a more extensive study should confirm it with more participants.

Resumo Este estudo analisou os dados clínicos periodontais de indivíduos com histórico de COVID-19 tratados em uma escola de odontologia durante a pandemia em 2021, antes da vacinação. Métodos: Essa análise incluiu indivíduos maiores de 18 anos sem histórico de distúrbios sistêmicos, exceto hipertensão arterial sistêmica. Os indivíduos que tiveram COVID-19 foram classificados de acordo com a Organização Mundial da Saúde como assintomáticos, com sintomas leves, moderados, graves ou críticos. Resultados: 95 indivíduos foram avaliados, incluindo 24 com histórico de COVID-19. 17% eram assintomáticos, 21% tinham sintomas leves, 25% moderados, 21% graves e 17% críticos, incluindo intubação. Os indivíduos sem histórico de COVID-19 apresentaram medidas significativamente mais baixas de profundidade de sondagem (p=0,003; teste de Mann-Whitney) e nível de fixação clínica (p=0,002) em comparação com indivíduos com histórico de COVID-19. Foi encontrada uma associação negativa significativa entre o sangramento à sondagem e a gravidade das características da COVID-19 (rho= -0,233; p=0,023). Por outro lado, foram encontradas associações positivas entre os valores de profundidade de sondagem (rho = 0,292; p = 0,004) e o nível médio de apego clínico (rho = 0,300; p = 0,003) e as características da COVID-19. Conclusão: Os dados periodontais mostraram que os pacientes que tiveram COVID-19 antes da vacinação podem apresentar um pior estado periodontal quando comparados a pacientes no mesmo ambiente clínico sem histórico de COVID-19. No entanto, um estudo mais extenso deve ser realizado para confirmar tal achado com maior número de participantes.

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.

Efecto cicatrizante en incisiones periodontales por extracto hidroalcohólico de Morinda citrifolia

Los tratamientos periodontales implican cortes y sangrado de la mucosa gingival; la Morinda citrifolia, específicamente sobre los fragmentos encargados de la cicatrización (plaquetas), tiene un efecto más significativo en los procesos curativos de las lesiones. Objetivo. Identificar el potencial cicatrizante de los extractos hidroalcohólicos de Morinda citrifolia (noni peruano) en los procesos regenerativos de las incisiones periodontales al 70% a diversas concentraciones (1%; 5; y 10%) y su efecto coadyuvante acelerador en la vía oral como curación de tejidos. Materiales y Métodos. Se realizó una investigación aplicada, bajo el diseño experimental. Para ello, se llevó a cabo un estudio previo para el análisis farmacognóstico, porcentaje de humedad, pruebas de solubilidad y el análisis fitoquímico cualitativo para garantizar que el análisis farmacológico y la prueba experimental se completaran adecuadamente. Se administraron dosis a cinco ratas albinas macho Holtzman divididas en cuatro grupos a los cuales se les aplicó las concentraciones en cantidades de 0,5 ml dos veces al día en la incisión, la cual se evaluó durante siete días para obtener parámetros específicos, como infección, tono de piel gingival, cierre de heridas, reducción del tamaño de la incisión y porcentaje de curación. Resultados. Indicaron que todos los grupos que se le suministró el extracto hidroalcohólico al 70% en varias concentraciones mejoró su actividad curativa al reducir el tamaño de la incisión en la encía al séptimo día, donde resultó que la mejor concentración fue del 5% en comparación con las otras concentraciones (1% y 10%). Investigación que indica la eficacia de la Morinda citrifolia peruana como acelerador del proceso de curación en la terapia periodontal.

Periodontal treatments involve cuts and bleeding of the gingival mucosa; Morinda citrifolia, specifically on the fragments in charge of healing (platelets), has a more significant effect on the healing processes of the lesions. Objective. To identify the healing potential of hydroalcoholic extracts of Morinda citrifolia (Peruvian noni) in the regenerative processes of periodontal incisions at 70% at various concentrations (1%; 5; and 10%) and its accelerating coadjuvant effect in the oral route as tissue healing. Materials and Methods. An applied research was carried out under an experimental design. For this purpose, a previous study was carried out for pharmacognostic analysis, moisture percentage, solubility tests and qualitative phytochemical analysis to ensure that the pharmacological analysis and experimental test were properly completed. Doses were administered to five male Holtzman albino rats divided into four groups to which the concentrations were applied in 0.5 ml amounts twice daily to the incision, which was evaluated for seven days for specific parameters, such as infection, gingival skin tone, wound closure, incision size reduction and percentage healing. Results. They indicated that all groups that were given the 70% hydroalcoholic extract in various concentrations improved their healing activity by reducing the size of the gingival incision on the seventh day, where it turned out that the best concentration was 5% compared to the other concentrations (1% and 10%). Conclusion. Research indicating the efficacy of Peruvian Morinda citrifolia as an accelerator of the healing process in periodontal therapy.

Os tratamentos periodontais envolvem corte e sangramento da mucosa gengival; a Morinda citrifolia, especificamente sobre os fragmentos responsáveis pela cicatrização (plaquetas), tem um efeito mais significativo nos processos de cicatrização das lesões. Objetivo. Identificar o potencial cicatrizante de extratos hidroalcoólicos de Morinda citrifolia (noni peruano) nos processos regenerativos de incisões periodontais a 70% em diversas concentrações (1%; 5; e 10%) e seu efeito coadjuvante acelerador na via oral como cicatrizante tecidual. Materiais e métodos. Foi realizada uma pesquisa aplicada sob um desenho experimental. Para esse fim, foi realizado um pré-estudo para análise farmacognóstica, porcentagem de umidade, testes de solubilidade e análise fitoquímica qualitativa para garantir que a análise farmacológica e o teste experimental fossem adequadamente concluídos. Cinco ratos albinos Holtzman machos divididos em quatro grupos foram dosados e as concentrações foram aplicadas em quantidades de 0,5 ml duas vezes ao dia na incisão, que foi avaliada por sete dias quanto a parâmetros específicos, como infecção, tônus gengivais da pele, fechamento da ferida, redução do tamanho da incisão e porcentagem de cicatrização. Resultados. Eles indicaram que todos os grupos que receberam extrato hidroalcoólico a 70% em várias concentrações melhoraram sua atividade de cicatrização ao reduzir o tamanho da incisão gengival no sétimo dia, sendo que a melhor concentração foi de 5% em comparação com as outras concentrações (1% e 10%). Conclusão. A pesquisa indica a eficácia da Morinda citrifolia peruana como um acelerador do processo de cicatrização na terapia periodontal.

Periodontitis en niños sanos de 3 años: dos casos con seguimiento a 5 años / Periodontitis in healthy 3-year-old children: two cases with 5-year follow-up

Objetivo: La periodontitis en dentición primaria es ex- cepcional en niños sin enfermedades sistémicas. El objetivo de este informe es describir las características clínicas y ra- diográficas de dos casos de niños de 3 años sistémicamente sanos con periodontitis, y su tratamiento con seguimiento a 5 años. Casos clínicos: En ambos casos, a los 3 años de edad los niños fueron derivados al especialista en periodoncia por su odontopediatra debido a la pérdida muy temprana de inci- sivos inferiores. El examen clínico y radiográfico mostró pér- dida de inserción clínica, pérdida ósea y movilidad dental en otros incisivos superiores e inferiores. Se realizó la intercon- sulta médica y se descartó que los niños padecieran enferme- dades relacionadas con el diagnóstico de periodontitis como manifestación de una enfermedad sistémica. El tratamiento consistió en la instrucción de medidas de higiene bucal que debían ser ejecutadas por los padres, ins- trumentación subgingival, antisépticos locales, medicación antibiótica sistémica y mantenimiento periodontal. No se rea- lizaron extracciones como parte del tratamiento. En ambos casos uno de los incisivos presentes al momento de la con- sulta se perdió prematuramente, antes de los 4 años. El resto de los incisivos primarios cumplieron su ciclo normal. Luego de 5 años de seguimiento, a la edad de 8 años, ambos niños presentaban los incisivos y los primeros molares permanentes periodontalmente sanos y el resto de los dientes primarios sin signos de periodontitis (AU)

Aim: Periodontitis in primary dentition is exceptional in children without systemic diseases. The objective of this article is to describe the clinical and radiographic charac- teristics of two cases of systemically healthy 3-year-old chil- dren with periodontitis, and their treatment, with a 5-year follow-up. Clinical cases: In both cases, at 3 years of age, the chil- dren were referred to a periodontic specialist by their pediat- ric dentist, due to the very early loss of lower incisors. Clin- ical and radiographic examination showed loss of clinical attachment, bone loss and dental mobility in other upper and lower incisors. A medical consultation was carried out and diseases related to the diagnosis of periodontitis as a mani- festation of a systemic disease were ruled out. The treatment consisted of instruction on oral hygiene measures that had to be carried out by the parents, subgingival instrumentation, local antiseptics, systemic antibiotic medication, and perio- dontal maintenance. No extractions were performed as part of the treatment. In both cases, one of the incisors present at the time of consultation was lost prematurely, before the age of 4 years. The rest of the primary incisors completed their normal cycle. After 5 years of follow-up, at the age of 8 years, both children showed periodontally healthy incisors and first permanent molars, and the rest of the primary teeth without signs of periodontitis (AU)

Recesión mandibular única tratada con colgajo desplazado lateral: Reporte de un caso

Introducción: Hoy en día, uno de los motivos de consulta de los pacientes es la inconformidad con su apariencia estética debido a la presencia de recesiones gingivales. Dentro de las diversas técnicas para tratar este tipo de defectos se encuentra el colgajo posicionado lateral, el cual, se utiliza para la cobertura radicular de recesiones gingivales únicas en dientes mandibulares y cuyos resultados han demostrado ganancia en altura de tejido queratinizado, ganancia en inserción clínica y una cobertura radicular completa. Reporte de Caso: Paciente femenino de 32 años, diagnosticado con defecto mucogingival único en torno a pieza dental 3.1 y que fue tratado con un colgajo posicionado lateral en combinación con proteínas derivadas de la matriz del esmalte, con el objetivo de cubrir la recesión gingival. Conclusión: La técnica de colgajo posicionado lateral es un tratamiento viable y eficaz para la cobertura radicular completa de defectos mucogingivales únicos en torno a diente, donde además se obtiene ganancia en altura de encía queratinizada, así como de nivel de inserción clínica.

Introduction: Nowadays, one of the reasons for consultation of patients is the dissatisfaction with their aesthetic appearance due to the presence of gingival recessions. Among the various techniques to treat this type of defects is the laterally positioned flap, which is used for root coverage of single gingival recessions in mandibular teeth and whose results have shown gain in height of keratinized tissue, clinical attachment gain and complete root coverage. Case Report: 32-year-old female patient, diagnosed with a single mucogingival defect around tooth 3.1 and treated with a laterally positioned flap in combination with enamel matrix derivatives, in order to cover the gingival recession. Conclusion: The laterally positioned flap technique is a viable and effective treatment for complete root coverage of single mucogingival defects around the tooth. In addition, there is a gain in keratinized gingiva and in clinical attachment.