Efecto de la hipoxia sobre los tejidos de la cavidad oral: revisión de la literatura / Effect of hypoxia on oral tissues: a review of the literature

La exposición a hipoxia es considerada un estímulo estresante, por lo que el organismo desarrolla meca-nismos de aclimatación para asegurar la homeosta-sis. Si bien el efecto de la hipoxia sobre los distintos sistemas de tejidos y órganos ha sido bien documen-tado, el rol de los bajos niveles de O2 en la cavidad oral no ha recibido el mismo análisis. En este trabajo se revisaron los datos bibliográficos disponibles sobre el efecto de la hipoxia sobre el tejido periodontal, las glándulas salivales, la pulpa dental y el hueso mandi-bular y alveolar. De lo analizado en la bibliografía, re-sulta evidente que los bajos niveles de O2 aumentan el número de mediadores inflamatorios que inducen la progresión de la enfermedad periodontal y, a su vez, la inflamación establecida durante dicha enfermedad agrava aún más las condiciones de hipoxia tisular. Las glándulas salivales también se encuentran afectadas durante la exposición a hipoxia, disminuyendo la can-tidad de saliva secretada, observándose alteraciones ultraestructurales en el parénquima glandular. Por otra parte, se ha establecido que la hipoxia puede te-ner efectos deseados para el cultivo de células madre de la pulpa dental, lo cual resulta útil en el campo de la odontología reparativa y también para el movimien-to dental durante los tratamientos ortodónticos. En conclusión, para determinar los efectos de la hipoxia en la cavidad oral se debe analizar no sólo el tipo de tejido involucrado sino también las condiciones de hi-poxia a las cuales éste es sometido, así también como la duración de la exposición y la modalidad de hipoxia (AU)

Exposure to hypoxia is considered a stressful stimulus, therefore the organism develops acclimation mechanisms to try to ensure homeostasis. Although the effect of hypoxia on different tissues and organs has been very well documented, the role of low levels of O2 in the oral cavity has not received the same analysis. In this review, we analyzed the available bibliographic data concerning the effects of hypoxia on periodontal tissue, salivary glands, and dental pulp. The published evidence demonstrates that low O2 levels increase the number of inflammatory mediators that induce the progression of periodontal disease, and, in turn, the inflammation established during the progression of periodontitis aggravates tissue hypoxia conditions. Salivary glands are also affected during hypoxic exposure, decreasing salivary secretion, and leading to ultrastructural alterations in the glandular parenchyma. On the other hand, hypoxia could also be beneficial in some scenarios. It has been established that dental pulp cells grow better in culture under hypoxic conditions than they do in normoxia. Furthermore, mild hypoxia seems to stimulate periodontal ligament cells proliferation and matrix degradation, key events during for orthodontic treatments. In conclusion, to determine the effects of hypoxia in the oral cavity, it is necessary to analyze not only the type of tissue involved but also the hypoxic conditions to which it is subjected, as well as its duration and modality (AU)

Effects of the photobiomodulation using different energy densities on the periodontal tissues under orthodontic force in rats with type 2 diabetes mellitus

Abstract To evaluate the impact of the GaAlAs diode laser with energy densities of 160 J/cm2, 320 J/cm2, and 640 J/cm2 on the periodontal tissues under continuous orthodontic force application and on the rate of orthodontic tooth movement in rats with type-2 diabetes mellitus. The intensity of primary alveolar bone formation was also investigated through the immune-positive osteocytes for OPN antibody. Forty adult male Wistar rats were divided into eight groups of 5 rats: normoglycemic (N), 160 J-laser-normoglycemic (160 J-LN), 320 J-laser-normoglycemic (320 J-LN), 640 J-laser-normoglycemic (640 J-LN), diabetic (D), 160 J-laser-diabetic (160 J-LD), 320 J-laser-diabetic (320 J-LD), and 640 J-laser-diabetic (640 J-LD) rats. Diabetes mellitus was induced by a single intravenous injection of 40 mg/kg monohydrated-alloxan. An orthodontic force magnitude of 20cN was applied. The laser parameters were continuous emission of 780-nm wavelength, output power of 20mW, and fiber probe with a spot size of 0.04 cm in diameter. Radiographic, histomorphological, and immunohistochemical analysis were performed after a period of 21 days. The photobiomodulation using the energy density of 640 J/cm2 strongly stimulated the alveolar bone formation and contributed the reorganization of the soft periodontal tissues, followed by the 320 J/cm2. Extensive alveolar bone loss, intense infiltration of inflammatory cells, and degradation of the PDJ tissue were mainly found in the D and 160 J-LD groups. The rate of orthodontic tooth movement was represented by the interdental distance between the cementoenamel junctions of the right mandibular first and second molars . This distance was larger in the diabetic groups (D: 39.98±1.97, 160 J-LD: 34.84±6.01, 320 J-LD: 29.82±1.73, and 640 J-LD: 35.47±4.56) than in the normoglycemic groups (N: 21.13±1.19; 160 J-LN: 22.69±0.72, 320 J-LN: 22.28±0.78, and 640 J-LN: 24.56±2.11). The number of osteopontin-positive osteocytes was significantly greater in the 640 J-LD (14.72 ± 0.82; p < 0.01) and 640 J-LN (13.62 ± 1.33; p < 0.05) groups than with D (9.82 ± 1.17) and 160 J-LD (9.77 ± 1.10) groups. Therefore, the energy density of 640 J/cm2 provided the best maintenance and integrity of the periodontal tissue microarchitecture under continuous orthodontic force when compared with the other dosages, mainly in the uncontrolled diabetic rats. The interdental distance was greater in the D and 160 J-LD groups due to presence of severe periodontitis caused by diabetes plus the mechanical stress generated by continuous orthodontic forces, implying, thus, an insufficient biostimulatory effect for the dosage of 160 J/cm2.

Lesões endodôntico-periodontais: do diagnóstico ao tratamento / Endodontic-periodontal lesions: from diagnosis to treatment

As doenças endodôntico-periodontais até hoje representam um desafio para o cirurgião-dentista. Uma única lesão pode apresentar sinais de envolvimento endodôntico e periodontal, o que pode induzir o cirurgião-dentista à realização de um tratamento inadequado. O diagnóstico da doença geralmente é difícil devido às íntimas conexões anatômicas e vasculares entre a polpa e o periodonto. Além disso, o fato dessas doenças serem frequentemente avaliadas como entidades diferentes dificulta ainda mais o diagnóstico. A avaliação do prognóstico e o tratamento também podem ser desafiadores. Microrganismos, trauma, reabsorções radiculares e perfurações estão entre os fatores etiológicos e contribuintes para o desenvolvimento e progressão da doença. Frequentemente, o dente acometido por uma lesão endodôntico-periodontal é condenado devido à falta de conhecimento do cirurgião-dentista. É fundamental reconhecer a relação entre as doenças para o manejo adequado da lesão. A realização de um diagnóstico preciso é um determinante crítico do resultado do tratamento. O presente estudo revisou a literatura relacionada à etiologia, classificação e tratamento dessa doença. A revisão foi feita através de consulta ao pubmed e foram incluídos artigos publicados entre 1974 e 2016. Os termos "lesão endoperio", "lesão endodôntico-periodontal" e "doença endodônticoperiodontal" foram as palavras-chave utilizadas no levantamento. Concluiu-se que é necessário abordar e tratar de forma multidisciplinar, sendo o tratamento direcionado à causa principal diagnosticada. Na lesão combinada verdadeira, o tratamento endodôntico deve preceder o periodontal.(AU)

Until these days endodontic-periodontal lesions remains a challenge to dentists. A single lesion may show signs of endodontic and periodontal involvement, which can induce the dentist to perform an inadequate treatment. The diagnosis is often difficult due to the intimate anatomical and vascular connections between the pulp and periodontium. Furthermore, the fact that these diseases are often evaluated as different entities complicates the diagnosis. Prognosis assessment and treatment can also be challenging. Microorganisms, trauma, perforations and radicular resorptions are among the etiologic factors and contributors to the development and progression of the disease. Often the tooth affected by an endodontic-periodontal lesion is doomed due to lack of knowledge of the dentist. It is important to recognize the relationship between the diseases for the proper management of the injury. This study reviewed the literature related to the etiology, classification and treatment of this disease. The reviewwas done through consultation with pubmed and articles published between 1974 and 2016 were included. The terms "endo perio lesion", "endodontic periodontal lesion" and "endodontic periodontal disease" were the key words used in the survey.It was concluded that it must be addressed and treated in a multidisciplinary way. Treatment should be directed to the main cause. In true combine lesion, endodontic treatment should precede periodontal.(AU)

Human papilloma virus in oral mucosa and its association with periodontal status of gynecologically infected women

El objetivo del estudio fue identificar la presencia del virus Papiloma Humano en lengua y periodonto de mujeres sanas y enfermas periodontales con lesiones genitales del mismo. Se evaluarontreinta mujeres, no menopáusicas, de entre 18 y 50 años de edad, derivadas del Servicio de Ginecología del Hospital Universitario Materno Neonatal de la ciudad de Córdoba, sistémicamentesanas y con diagnóstico gineco lógico de lesiones por HPV. Se realizó, anamnesis, inspec ción de mucosas bucales, examen clínico periodontal y la toma de tres escobillados por paciente, dos de un mismo sitio periodontal (epitelio externo de encía y epitelio interno del surco/bolsa periodontal) y el otro de lengua. Las 90 muestras obtenidas fueron sometidas a estudios citológicos de Papanicolau y a estudios moleculares de amplificación de ácidos nucleicos por Reacción en Cadena de la Polimerasa. Los datos fueron agrupados y analizados por el “Test Chi Cuadrado” (χ2)y el “Índice de Kappa” (κ). Fue demostrada la alta prevalencia de la presencia del virus papiloma tanto en lengua (30 por ciento), como en tejidos periodontales (15 por ciento). El genotipo -16 de alto riesgo (HR) fue identificado en mayores porcentajes (67 por ciento) encontrando, también, el genotipo -52 y el -6. Siempre que el HPV estuvo presente en los sitios periodontales fue detectado, también, en la lengua de las mismas pacientes, de las cuáles el 88,89 por ciento practicabasexo oral. Se destaca el hallazgo clínico de lesiones estomatológicas compatibles con papilitis foliada en las pacientes HPVintrabucales positivas. Se señala en la población femenina de Córdoba, Argentina, la alta prevalencia de la presencia de HPV donde el genotipo -16 fue detectado en mayor porcentaje. En lamuestra analizada No fueron positivamente correlacionados lapresencia de HPV y la mayor incidencia y severidad de lesiones periodontales...

Microscopic evaluation of induced tooth movement after subluxation trauma: an experimental study in rats

OBJECTIVE: The objective of this study was to assess the histological alterations that occurred in the periodontal area of rat molars submitted to induced tooth movement (ITM) right after an intentional trauma (subluxation). METHODS: Forty adult male Wistar rats (Rattus norvegicus albinus) were selected. The animals were divided into eight groups (n = 5), according to the combination of variables: Group 1 - control (neither trauma nor ITM); Group 2 - ITM; Groups 3, 4, 5 and 6 - dentoalveolar trauma groups corresponding, respectively, to 1, 3, 8 and 10 days after trauma; Groups 7 and 8 - the animals' molars were subjected to a 900 cN impact and, one and three days after the trauma event, tooth movement was induced. The rats' maxillary first molars were mesially moved during seven days with a closed coil (50 cN). After the experimental period of each group, the animals were sacrificed by anesthetic overdose and the right maxillas were removed and processed for histological analysis under light microscopy. RESULTS: In the animals of group 3, 4, 5 and 6, the histological alterations were not very significant. Consequently, the effect of induced tooth movement right after a subluxation event (groups 7 and 8) was very similar to those described for Group 2. CONCLUSION: There was no difference in the quality of periodontal repair when ITM was applied to teeth that had suffered a subluxation trauma. .

OBJETIVO: avaliar as alterações histológicas ocorridas na área periodontal de molares de ratos submetidos à movimentação dentária induzida (MDI), logo após um trauma intencional (subluxação). MÉTODOS: quarenta ratos Wistar machos adultos (Rattus norvegicus albinus) foram selecionados. Os animais foram divididos em oito grupos (n = 5), de acordo com a combinação das variáveis: Grupo 1 - controle (sem trauma e sem MDI); Grupo 2 - MDI; Grupos 3, 4, 5 e 6 - grupos de trauma dentoalveolar correspondendo, respectivamente, para 1, 3, 8 e 10 dias após o trauma; Grupos 7 e 8 - os molares murinos foram submetidos a um impacto de 900cN e, de um e três dias após o evento trauma, o movimento do dente foi induzido. Os primeiros molares superiores dos animais foram movidos mesialmente durante sete dias, com uma mola fechada (50cN). Após período experimental de cada grupo, os animais foram sacrificados por overdose anestésica e as maxilas direitas foram removidas e processadas para análise histológica qualitativa. RESULTADOS: nos animais dos grupos 3, 4, 5 e 6, as alterações histológicas não foram muito significativas. Consequentemente, o efeito do movimento dentário induzido logo após um evento de subluxação (grupos 7 e 8) foi muito semelhante ao descrito para o grupo 2. CONCLUSÃO: não houve diferença na qualidade do reparo periodontal quando a MDI foi aplicada aos dentes que sofreram um trauma de subluxação. .

Periodontal evaluation of different toothbrushing techniques in patients with fixed orthodontic appliances

INTRODUCTION: Plaque control is the major consensus during orthodontic treatment to prevent the occurrence of cavities and periodontal inflammation. The mechanic resource of greater effectiveness and frequent use in this control is the oral hygiene. The tooth brushing techniques most used in orthodontic patients are: Ramfjord's method, Modified Stillman technique and Bass method. OBJECTIVE: Since control studies evaluating the effectiveness of usual tooth brushing techniques do not show clear advantage, the objective of this study was to evaluate the effectiveness of three brushing methods, through periodontal clinical parameters of patients with fixed orthodontic appliances. METHODS: Thirty patients were selected, with ages between 14 and 22 years old, with fixed orthodontic appliances. After basic periodontal treatment the following factors were evaluated: 1 - Plaque index and 2 - Gingival index and each patient was randomly included in one of the three selected groups according to the brushing technique: Group 1 - Scrubbing technique; Group 2 - Modified Stillman technique and Group 3 - Bass technique. Patients were evaluated for 9 months. RESULTS: The results showed a significant reduction of clinical parameters by the end of this period, however there was a very significant reduction of Gingival index on group 3 (13.6%) when compared to the other groups. CONCLUSION: Thus, it can be suggested that the Bass technique can be effective on the reduction of periodontal clinical parameters of Plaque index and Gingival index in patients with fixed orthodontic appliances.

INTRODUÇÃO: o controle de placa bacteriana é o maior consenso durante o tratamento ortodôntico para prevenir a ocorrência de cáries e inflamação periodontal. O recurso mecânico de maior efetividade e uso frequente nesse controle é a higienização bucal. As técnicas de escovação dentária mais usadas por pacientes ortodônticos são: a friccional giratória de Ramfjord, a Stillman modificada e a sulcular de Bass. OBJETIVO: tendo em vista que estudos de controle avaliando a efetividade das técnicas de escovação mais comuns não demonstraram nenhuma superioridade clara, o objetivo desse estudo foi avaliar a efetividade de três técnicas de escovação, através dos parâmetros clínicos periodontais de pacientes portadores de aparelhos ortodônticos fixos. MÉTODOS: foram selecionados 30 pacientes, com idades entre 14 e 22 anos, portadores de aparelhos ortodônticos fixos. Após o final do tratamento periodontal básico, determinou-se o (1) Índice de Placa e o (2) Índice Gengival, e cada paciente foi incluído, aleatoriamente, em um dos três grupos, selecionados de acordo com a técnica de escovação (Grupo 1 = Técnica de esfregaço; Grupo 2 = Técnica de Stillman Modificada e Grupo 3 = Técnica de Bass). Os pacientes foram avaliados por um período total de 9 meses. RESULTADOS: os resultados mostraram uma diminuição significativa dos parâmetros clínicos ao final desse período, porém houve uma redução muito significativa do Índice Gengival no grupo 3 (13,6%), em comparação aos demais grupos. CONCLUSÃO: pode-se sugerir que a Técnica de Bass pode ser efetiva na redução dos parâmetros clínicos periodontais de Índice de Placa e Índice Gengival em pacientes portadores de aparelhos ortodônticos fixos.

Functional activity of neutrophils and systemic inflammatory response of Down’s syndrome patients with periodontal disease

Periodontal disease (PD) is characterized as an inflammatory process that compromises the support and protection of the periodontium. Patients with Down’s syndrome (DS) are prone to develop PD. Neutrophils (NE) are the first line of defense against infection and their absence sets the stage for disease. Aim: To compare the activity and function of NE in the peripheral blood from DS patients with and without PD, assisted at the Center for Dental Assistance to Patients with Special Needs affiliated with the School of Dentistry of Araçatuba, Brazil. Methods: Purified NE were collected from peripheral blood of 22 DS patients. NE were used to detect the 5-lypoxigenase (5-LO) expression by RT-PCR. Plasma from peripheral blood was collected to measure tumor necrosis factor-a (TNF-a) and interleukin-8 (IL-8) by ELISA and nitrite (NO3) using a Griess assay. Results: Data analysis demonstrated that DS patients with PD present high levels of TNF-a and IL-8 when compared with DS patients without PD. However, there was no statistically significant difference in the levels of NO3 production between the groups. The levels of the inflammatory mediator 5-LO expression increased in DS patients with PD. Conclusions: According with these results, it was concluded that TNF-a and IL-8 are produced by DS patients with PD. Furthermore, DS patients with PD presented high levels of 5-LO expression, suggesting the presence of leukotriene B4 (LTB4) in PD, thus demonstrating that the changes in NE function due to the elevation of inflammatory mediators contribute to PD.

Crestal bone preservation: A review of different approaches for successful implant therapy.

The level of bone crest surrounding the implant is of utmost significance to determine osseointegrated implant success, as preservation of marginal bone height is highly important for long-term dental implant survival. Various approaches have been described in the literature to prevent the crestal bone loss, including platform switching, non-submerged approach, scalloped implants, implant design modifications, progressive loading, immediate implant placement, etc. The purpose of this paper is to review all the possible methods to preserve the crestal bone, when each method should be used and their success rates in an attempt to address this complex problem of crestal bone resorption. "PubMed" and "Google Scholar" were used to find out any studies involving platform switching concept from 1990 up to 2009. Twenty-four studies involving methods for preservation of crestal bone were evaluated, which included 26% studies on platform switching, 22% on non-submerged approach, 17% on scalloped implants, 13% on progressive loading and 22% on immediate implant placement. Crestal bone preservation should be thought of starting from the design of the implant to be placed. The technique to be followed in a given case will depend upon the density of bone, force factors by the patient, bone volume and amount of soft tissues, etc. The best possible method or the combination of the methods should be used to preserve the crestal bone for the long-term success of the implants.

Evaluation of community periodontal index of treatment needs in pregnant and non pregnant women

Based on the latest researches it is concluded that periodontal disease is an important risk factor, leading to preterm delivery low birth weight babies and the effects of socioeconomic status on periodontal condition. The aim of this study, evaluation of periodontal condition of pregnant and non-pregnant women based on CPITN index and relation between the demographic and clinical variables. A cross-sectional descriptive study was carried out among 540 pregnant and non-pregnant women. Data collection was carried out with a questionnaire with demographic and clinical variables. Examinations were performed with WHO probes and dental mirrors. Data were analyzed by the means on Chi-square T-test and Anova. SPSS Software was used. The results of study showed that 66.7% pregnant women had periodontal disease and 92% pregnant women in third trimester had periodontal disease. There was a significant relation between CPITN and gestational age, education level, economic level and frequency of tooth brushing. The results of this study showed that pregnant women had higher CPITN than non pregnant women, then it might be suggested that simple preventive oral hygiene program help to maintain healthy periodontium during pregnancy

Endoperiodontal lesion due to communication internal root resorption / Lesão endoperiodontal decorrente de reabsorção radicular interna comunicante

Internal root resorptions are usually non-symptomatic and are discovered occasionally throughperiapical radiographs, revealing a very defined and regular outline. These resorptions are progressive,and eventually perforate the periodontium. The present work describes the treatment of a clinicalcase of internal root resorption with periodontal communication, outlining the interrelation betweenperiodontal surgery and endodontic therapy.

As reabsorções internas são normalmente assintomáticas e descobertas ocasionalmente atravésde radiografias periapicais, onde revelam um contorno bem definido e regular. Estasreabsorções são progressivas e eventualmente perfuram o periodonto. O presente trabalhodescreve o tratamento de um caso clínico de reabsorção radicular interna com comunicaçãoperiodontal onde se fizeram necessárias a inter-relação entre a cirurgia periodontal e a terapiaendodôntica convencional.

Displasia cementária periapical - relato de caso / Periapical cemental dysplasia - case report

A displasia cementária periapical (DCP) é um tumor odontogênico benigno de origem mesenquimal, derivado do ligamento peridontal. É comumente descoberta em exames radiográficos de rotina uma vez que não apresenta sinais ou sintomas clínicos. Devido às suas características radiográficas pode ser confundida com lesões periapicais inflamatórias, cistos periodontais e lesões fibro-ósseas. O objetivo deste artigo é revisar a literatura, relatar um caso de DCP e ressaltar a importância de um correto diagnóstico

Microscopic qualitative evaluation of fixation time and decalcification media in rat maxillary periodontium

The rat model is widely used in periodontal research and the quality of histological sections is essential. The purpose of this study was to evaluate the histological characteristics of periodontal tissues in Wistar rat maxillae, with different times of fixation and decalcified by nitric acid or formic acid (Anna Morse Solution). Fifteen rats were used. Fixation was performed for 24, 48 and 72 hours. The maxillae were hemi-sectioned and each part was decalcified either in nitric acid for 7 days or in Anna Morse solution for 35 days. Two trained and blinded examiners performed the evaluation. Fourty eight hours of fixation and decalcification with Anna Morse solution showed more clear characteristics of the epithelium-connective tissue interface and of the periodontal structures. Mean measurements between the cementum-enamel junction and the bone crest varied in the different experimental times from 176.5 (± 60.45) to 210.94 (± 39.33) pixels on the buccal aspect, and from 199.69 (± 38.33) to 298.55 (± 70.81) pixels on the palatal aspect, with no statistically significant differences (ANOVA, p > 0.05). In the same fixation period, decalcification with nitric acid or Anna Morse solution did not display any statistically significant differences. It may be concluded that for a qualitative histological analysis, fixation should preferably be for 48 hours and the demineralization should be made by Anna Morse solution. For a histomorphometric analysis, the decalcification solution does not interfere in the results.

O modelo rato é extensamente usado na pesquisa periodontal, e a qualidade dos cortes histológicos é essencial. A proposta deste estudo foi avaliar as características histológicas dos tecidos periodontais nas maxilas de ratos Wistar, após diferentes períodos de fixação e descalcificação pelo ácido nítrico ou pelo ácido fórmico (Solução de Anna Morse). Quinze ratos foram usados. A fixação foi realizada nos períodos de 24, 48 e 72 horas. As maxilas foram divididas e parte foi descalcificada em ácido nítrico durante 7 dias e parte com solução de Anna Morse por 35 dias. Dois examinadores treinados e cegos executaram a avaliação. Quarenta e oito horas de fixação e descalcificação com solução de Anna Morse mostraram características mais evidentes da interface epitélio-conjuntivo, assim como das estruturas periodontais. As médias, por vestibular, entre a junção cemento-esmalte e a crista óssea nos diferentes tempos experimentais variaram entre 176,5 (± 60,45) e 210,94 (± 39,33) "pixels", e, na face palatina, entre 199,69 (± 38,33) e 298,55 (± 70,81) "pixels", sem nenhuma diferença estatisticamente significativa (ANOVA, p > 0,05). No mesmo período de fixação, a descalcificação com ácido nítrico ou solução de Anna Morse não mostrou diferenças estatisticamente significantes. Pode-se concluir que, para a análise histológica qualitativa, a fixação deve ser preferivelmente em 48 horas e a desmineralização por solução de Anna Morse. Para a análise histo-morfométrica, a solução descalcificadora não interferiu nos resultados.

Síndrome de Crest, sclerodermia sistémica progresiva: ¿cómo tratar y mantener un periodonto? Caso clínico / Crest syndrome, progressive systemic scleroderma: how to treat and mantein a periodontium? Clinical case

El síndrome de Crest es una enfermedad autoinmune. Su diagnóstico es un desafío, los tratamientos sistémicos yperiodontal son muy difíciles. El caso clínico que presentamos, tratado en la práctica privada, ofrece una visión de esta enfermedad. Asimismo, permite hacer una crítica a los sistemas de salud que no la contemplan y categorizan como discapacitados a este tipo de pacientes.

Determination of systemically & locally induced periodontal defects in rats.

BACKGROUND & OBJECTIVE: The role of lathyrogens on bone metabolism is unclear, therefore we undertook this study to observe periodontal and systemic alterations in experimental lathyrism in rat and compare these changes to that observed in the locally induced periodontitis group. METHODS: A total of 45 male Wistar rats were equally divided in the lathyritic group (group 1), ligature-induced periodontitis group (group 2), and healthy controls (group 3). Experimental lathyrism was induced by once daily subcutaneous administration of beta-aminoproprionitrile (beta-APN), at a dose of 5 mg/0.4 ml per 100 g of body weight for 40 days. Ligature-induced periodontitis was created by tying silk ligatures on the necks of mandibular molars. After 40 days, blood samples were obtained and the animals were decapitated. Radiographic observations, extraction tests, histologic evaluations were performed, and serum ALP activity and gingival tissue IL-1beta levels were measured. RESULTS: Significant alveolar bone resorption around the mandibular molar teeth (P<0.001); lower extraction force levels (P<0.001); higher numbers of lymphocytes and macrophages (P<0.01) (both in connective tissue and epithelium at the dentogingival junction); decreased ALP activity (P<0.001); and increased gingival tissue IL-1beta levels (P<0.001) were observed in groups 1 and 2, compared to those in group 3. ALP activity was higher in group 1 than in group 2 rats (P<0.05). INTERPRETATION & CONCLUSION: Similar radiographical and histopathological findings and comparable increases in gingival tissue IL-1beta levels both in groups 1 and 2 showed that in addition to resorption of alveolar bone, chronic inflammation of periodontium also occurred both in the lathyritic rats as well as in ligature-induced periodontitis group rats.

Granuloma periférico de células gigantes: histopatologia e imunohistoquímica anti-PCNA e anti-a-actina de músculo liso: análise quantitativa / Peripheral giant cell granuloa: histopatology and anti-PCNA immunohistochemistry and anti-a-actine of smooth muscle: quantitative analysis

O granuloma periférico de células gigantes (GPCG) é uma lesão reacional freqüentemente encontrada no periodonto. O objetivo do presente estudo foi avaliar estas lesões, através da histopatologia, estudo das fibras colágenas e elásticas, imunohistoquímica anti-a-actina de músculo liso para avaliação dos vasos e a atividade proliferativa através da imunohistoquímica anti-PCNA. Foram selecionadas 26 lesões de GPCG incluídas em blocos de parafina. Não houve diferenças estatisticamente significantes entre indivíduos de diferentes sexos, idades e achados histopatológicos com relação a fibras colágenas, fibras elásticas e células gigantes. A densidade de volume (Vv) dos vasos foi estatisticamente significante maior em indivíduos com mais de 18 anos quando comparados com menores de 18 anos. As células gigantes foram PCNA negativas e o Vv de PCNA também não mostrou diferenças estatisticamente significantes entre indivíduos de diferentes sexos, idades e achados histopatológicos. O volume ocupado por vasos, fibras colágenas e elásticas e células gigantes nas lesões de GPCG representou cerca de 25% do volume total. Os resultados deste estudo reforçam o comportamento reacional das lesões de GPCG.

Avaliação da transmissibilidade de microrganismos periodontopatogênicos entre mães e filhos utilizando-se o teste BANA / Periodontophatogens microorganisms transmission between mother and children using the BANA test evaluation

Descobertas recentes sugerem que microrganismos periodontopatogênicos são transmitidos entre membros de uma mesma família, pois há verificações da semelhança de linhagens de bactérias obtidas de seus integrantes, principalmente da mãe. Assim, o objetivo foi verificar se havia alguma correlação significativa entre os resultados do Teste BANA (Perioscan), obtidos em amostras de placa dentária subgengival de 54 crianças, entre 6 e 9 anos, e suas mães, todos residentes no município de Barretos−S.P. As amostras de placa subgengival foram colhidas com curetas periodontais de 432 sítios. Após a análise dos dados, os resultados do Teste BANA demonstraram que 67 sítios de crianças (31%) apresentaram reatividade positiva, enquanto que nas mães o número foi de 85 (39,3%). Em relação a negatividade do BANA nas crianças e suas mães, foi, respectivamente, de 149 (69%) e de 131 (60,7%) sítios, o que demonstrou a existência de uma relação estatisticamente significativa entre as variáveis BANA de mãe e filho. Os resultados do presente estudo permitiram sugerir que a presença de bactérias periodontopatogênicas nos filhos está relacionada à presença das mesmas bactérias nas mães, e que possível relacionamento de alterações periodontais nas mães podem representar significado importante no estabelecimento das patologias periodontais nos filhos

Recent researchs suggest that periodontophatogens microrganisms are transmitted among the members of the same family, because it could be observed the likeness of the lineages of obtained from bacterias of family members, mainly of the mother. The purpose of this study was to verify if there was some significant correlation between the results of the Test BANA (Perioscan), obtained in samples of subgingival dental plaque of 54 children between 6 and 9 years and their mothers, resident in the municipal district BarretosS.P. The samples of the subgingival plaques were picked up with periodontal instruments in 432 sites. After the statistical analysis of the data, the BANA Test results showed that in the children 67 (31%) of the sites presented positive reactivity while in the mothers 85 (39,3%) and in relation to the negativity of the BANA test, it was 149 (69%) e 131 (60,7%) respectivilly, this showed a statistically significant relationship between mother's and son BANA variable. The results of the present study let us to suggest that the presence of bacterial periodontophatogens in the children is related with the presence of the same bacterias in their mothers, and that a possible relationship of the periodontal alterations in the mothers can be an important factor in the establishement of periodontal pathologies in children

El tabaco daña la salud. Alerta para los tejidos periodontales! / Tobacco damages the health. An alert for periodontal tissues!

En este trabajo de revisión bibliográfica se encontró que diversos autores coinciden acerca del daño que las sustancias tóxicas del tabaco, provocan a los tejidos periodontales. Conocer la influencia de la nicotina sobre dichos tejidos, servirá de motivación para trabajar en prevención, mejorar el diagnóstico, conocer la limitación del tratamiento y orientar el pronóstico de la enfermedad periodontal del fumador

Cambios inmunológicos en pacientes con periodontitis / Immunologic changes in patients with periodontitis

Se realizó una investigación en 37 pacientes atendidos en el Servicio de Periodontología de la Clínica Estomatológica Docente Provincial de Santiago de Cuba, durante los meses de mayo a junio de 1989, a los cuales se les tomó una muestra de la pared blanda de la bolsa para realizarles biopsia. Los mismos fueron procesados en el Departamento de Anatomía Patológica del Hospital Clinicoquirúrgico "Saturnino Lora", con el fin de observar el componente inmune, así como los cambios histológicos respectivos. Se constató la presencia de abundantes plasmocitos y linfocitos y hubo dependencia de los linfocitos B, predominio de células plasmáticas y gran número de población de células linfoplasmocitarias; la acantosis fue el cambio epitelial más frecuente