O diabetes mellitus (DM) é caracterizado por uma deficiência no transporte de glicose da corrente sanguínea para o interior da célula, elevando os níveis de glicose no sangue. Isso ocorre pela deficiência e até mesmo resistência à insulina, e é controlada por agentes hipoglicêmicos orais e/ou dieta, associada a exercícios físicos. É classificada em tipo I e II, sendo que o segundo é a forma mais comum da doença e tem a idade como um dos fatores predisponentes. O periodonto é formado por estruturas de suporte e proteção ao elemento dentário e seu aspecto de saúde tem uma importância significante na cavidade bucal. A doença periodontal (DP) é um processo inflamatório crônico caracterizado por inflamação do tecido gengival e/ou perda de estruturas que compõem o periodonto, causando danos à estrutura dentária ou até perda do dente. É reconhecida como a sexta maior complicação do diabetes. Esse estudo teve como objetivo comparar as alterações periodontais em indivíduos diabéticos tipo II e não diabéticos residentes no município de Araguaína Tocantins (TO). Para isso, foram examinados 34 pacientes divididos em dois grupos: diabéticos e não diabéticos, que foram submetidos a exames periodontais para determinar a Profundidade de Sondagem (PS), Perda de Inserção Clínica (PIC), Índice Gengival (IG), Índice de Placa (IP), Índice de Higiene Oral (IHO) e exames laboratoriais para os diabéticos tipo II. Para a análise estatística foi usado o teste t no intuito de obter as correlações dos índices entre os diabéticos e o teste U para analisar as alterações periodontais entre os grupos. Foram encontrados PIC e IHO maiores em diabéticos, sendo os demais índices maiores no grupo dos não diabéticos. Só IP não apresentou diferença estatística significante (p>0,05). Também foi verificada uma correlação entre IP e IG, não ocorrendo entre os demais índices. Concluiu-se que os diabéticos têm doença periodontal mais severa que os não diabéticos. / Diabetes Melitus (DM) is characterized by a deficiency in the glicose transport from the blood stream to the inside of cells, raising the glicose leves in the blood. This occurs due to the deficiency or even resistance to insulin, and it is controlled by oral hypoglicemic agents and/or diet, associated with physical exercises. It is classified in types I and II, in such a way the second type in the most common and its predisponent factor is age. The periodonto is made of structures that support and protect the dental element and its health aspect has a significant importance to the bucal cavity. The periodontal disease (PD) is a chronic inflammatory process characterized by inflammation of the gingival tissue and /or loss of structures that compose the periodonto, causing damage to the dental structure or even loss of teeth. Its known as the sixth biggest complication derived from diabetes. This work had the purpose of comparing periodontal modifications in diabetic type II and non diabetic patients who lived in Araguaína Tocantins (TO). Therefore, 34 patients were examined and separated in two groups with PD: diabetics and non diabetics. They were submitted to periodontal examination in order to measure the Depth Proof (PPD), Clinical Attachment Loss (CAL), Gingival Index (GI), Plaque Index (PII), Oral Hygiene Index (OHI) indices. Also, laboratorial tests were made for type II - diabetic patients. The statistical analysis was made using the t-test to obtain the indices of correlation in diabetic group and the u-test to evaluate periodontal modifications between the groups. The CAL and the indices were higher in diabetic group and the other indices were higher in non diabetic group. Only the PII index show no significant statistic difference (p>0,05). It was also verified a correlation between PII and GI indices, yet it was not true in other indices. It was possible the conclude that the diabetics have more severe periodontal disease than the non diabetics.

Orientador: Wilson Roberto Poi / Banca: Sônia Regina Panzarini Barioni / Banca: Maurício Zardo / Banca: Wilson Roberto Poi / Resumo: Quando um dente é avulsionado, o reimplante dentário imediato é o procedimento ideal, porém nem sempre é uma realidade clínica. Diante desta situação, vários protocolos de tratamento têm sidos propostos para o reimplante tardio cujos objetivos são retardar o início da reabsorção radicular e aumentar a sobrevida do dente avulsionado. O objetivo deste trabalho é analisar o processo de reparo do reimplante tardio após o tratamento do ligamento periodontal necrosado de dentes de ratos com ácido cítrico. Trinta ratos, divididos em 3 grupos de 10 animais, tiveram o incisivo superior direito extraído e mantido em meio ambiente durante 5 minutos no Grupo I (Controle) e nos outros 2 grupos por 60 minutos. Posteriormente, os dentes do grupo I foram reimplantados. No grupo II, os dentes tiveram sua papila dentária removida, a polpa extirpada e o canal radicular preenchido com hidróxido de cálcio e reimplantados. No grupo III, os mesmos cuidados foram tomados, mas antes do preenchimento do canal com o hidróxido de cálcio, o dente foi mantido imerso em solução de ácido cítrico, pH1, por 3 minutos. Os resultados obtidos após os 60 dias de sacrifício demonstraram diferença estatisticamente significante (p<0,05) entre os grupos quanto à reabsorção por substituição, não apresentando diferença quanto à anquilose e reabsorção inflamatória. Quando a reabsorção por substituição foi avaliada, o grupo controle apresentou menor quantidade em relação outros grupos, apresentando diferença estatisticamente significante. A estrutura radicular e a extensão de cemento foram mais acometidas pela reabsorção por substituição e anquilose no grupo II (tardio) do que no grupo tratado com ácido, mas sem diferenças significativas. De acordo com os resultados obtidos, foi possível concluir que o reimplante tardio com tratamento do ligamento periodontal necrosado com ácido... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: When it happens the dental avulsed, the immediate dental reimplant it is the ideal procedure, however not always it is a clinical reality. Due to this situation, several treatment protocols has been proposed for the late reimplante tends as objective delays the beginning of the radicular reabsorption and to improve the prognostic of the avulsed tooth. The objective of this article is to analyze the process of repair of the delayed reimplant after treatment, with citric acid, of the death periodontal ligament of rat's teeth. Forty rats, divided in 3 groups of 10 animals, had the incisor extracted right superior and maintained in environment by the period of 5 minutes in the Group I (Controls) and in the other 3 groups for 60 minutes. Later, the teeth of the group I, were reimplanted. In the group II, the teeth had your dental papilla removed, the extirpated pulp and the radicular channel filled out with hydroxide of calcium and reimplanted. In the group III the same carefuls were been but before the completion of the channel with the hydroxide of calcium, the tooth was maintained submerged in citric acid solution pH1 for 3 minutes. The results demonstrated significant statistic difference (p <0,05) among the groups with relationship to the reabsorption for substitution, not presenting difference with relationship to the anquilose and inflammatory reabsorption. When appraised the reabsorption for substitution, the group control presented smaller amount in relation to the other groups, presenting significant statistic difference. The structure radicular and the cemento extension were more committed for the reabsorption for substitution and anquilose in the group II (late) than in the treated group with acid, but without significant differences. In agreement with the obtained results, it can be concluded that the late reimplant with treatment of the ligament periodontal necrosado with citric... (Complete abstract, click electronic address below) / Mestre

Indiana University-Purdue University Indianapolis (IUPUI) / Orthodontics research investigates the methods in which tooth displacement may be directed in the tooth-periodontal ligament-bone-complex. In the biological environment, the periodontal ligament is the soft tissue responsible for the absorption of forces on teeth and has a direct connection to tooth mobility. Current research is limited in that it must be conducted in an in-vivo capacity. A major advancement in orthodontics research would be a testing method that allows for the development and analysis of orthodontic devices without a patient present. This study outlines the development and testing methods for the validation of an artificial periodontal ligament to be used in conjunction with an artificial-tooth-periodontal ligament-bone-complex. The study focused on finding the criteria in which consistent results were produced, the mixture that best simulated the human periodontal ligament’s mechanical behavior, and the robustness of the artificial-periodontal ligament-bone-complex. This study utilized a geometrically accurate denture mold filled with varying compositions of an artificial periodontal ligament for testing. Experiments focused on findings of viscoelasticity, curing times, and instantaneous responses of the teeth under direct orthodontic loading, as well as the changes in response from different teeth within the denture mold. Tests confirmed that a mixture composed of 50\% Gasket Sealant No. 2 and 50\% RTV 587 Silicone produced a substance that could adequately serve as an artificial periodontal ligament.

Indiana University-Purdue University Indianapolis (IUPUI) Indiana University School of Dentistry / Background: Pre-eclampsia a potentially life threatening hypertensive disorder occurring in 3-14% of pregnancies. Its etiology is multifactorial involving the placenta. The only “cure” that currently exists is the delivery of the baby, which is often pre-term. There is no early pregnancy screening test to recognize those at risk. Recently, an altered immune-inflammatory responses at the placental level in response to infectious agents (eg., periodontal pathogens) have been proposed to be etiological for this pregnancy complication. A new class of Pattern Recognition Receptors called Peptidoglycan Recognition Proteins (PGRPs) constituting 4 distinct molecules PGRP 1-4 is emerging as a key player in modulating host responses to peptidoglycan and its breakdown products. A critical knowledge gap exists on the role of PGRPs in the innate immune responses that occur at the maternal-fetal interface in response to pathogens and their components that may be present in maternal circulation secondary to chronic infections. Aim: The aim of this pilot study is to investigate the expression PGRPs in the placenta of pre-eclamptic women. The overall goal is to better understand the association of periodontal disease and adverse pregnancy outcomes. Methods and Materials: This case control study consisted of subjects with: (1) normal term pregnancies (n=7) (2) pre-eclampsia (n=7). Preeclampsia was defined as hypertension (systolic blood pressure of ≥ 140 mm Hg or diastolic blood pressure of ≥ 90 mm Hg on at least 2 occasions, 4 hours to 1 week apart) and proteinuria (≥ 300 mg in a 24-hour urine collection or one dipstick measurement of ≥ 2+). A real time quantitative PCR array was used to analyze the relative mRNA expression of TLR2, TLR4, NOD1, NOD2, PGRP1, PGRP2, PGRP3, and PGRP4. Immunohistochemistry was performed to determine the cell type(s) expressing the PGRP proteins in the placental tissue. Summary statistics (mean, standard deviation, range, 95% confidence interval for the mean) were calculated for PGRP 1-4 expression for each group. Results and conclusions: The PCR data showed the expression of PGRPs 1, 3 and 4 in the placental samples. There was an up-regulation of PGRP-1 (1.4 fold) and down regulation of PGRP-3 (1.3 fold) and PGRP-4 (1.6 fold). TLR2, TLR4 and NOD2 mRNA were also elevated in the placental samples. Immunohistochemistry demonstrated positive staining for PGRPs 3 and 4 in the trophoblasts. The results from this novel research could lead to development of salivary and/or plasmatic biomarkers for early detection of PE and warrants further investigation.

INTRODUÇÃO: A periodontite é uma doença infecciosa associada à inflamação crônica dos tecidos do dente. Os mediadores inflamatórios e citocinas podem influenciar o curso de doenças reumáticas. O objetivo deste trabalho foi verificar se o tratamento da doença periodontal (DP) possue correlação com a atividade do lúpus eritematoso sistêmico (LES). MÉTODOS: Foram avaliados 42 pacientes com LES (ACR, 1997) e consecutivamente randomizados em dois grupos. Os critérios de exclusão foram SLEDAI < 2 e/ou Índice de Sangramento Sulcular (ISS) igual a zero, obtendo-se o grupo TRATADO com 19 pacientes e o CONTROLE com 17 pacientes. Todos os pacientes estavam sob tratamento com ciclofosfamida endovenosa. Estes grupos foram pareados para idade, sexo, e raça. Foram determinados a velocidade de hemossedimentação (VHS), a proteína C reativa (PCR) e o SLEDAI. A graduação da doença periodontal foi aferida através da profundidade da bolsa periodontal (PB), do ISS e do nível de inserção (NI). O tratamento odontológico objetivou a desinfecção oral completa. O grupo TRATADO iniciou o tratamento odontológico imediatamente após a visita inicial e foram reavaliados após três meses. O grupo CONTROLE iniciou o tratamento odontológico após três meses de observação. Assim, todos os pacientes com SLEDAI ? 2 e/ou ISS ? zero, passaram a pertencer ao grupo TRATADO (n=32). Esses pacientes foram reavaliados após três meses do término do tratamento odontológico. RESULTADOS: Os grupos foram similares na visita inicial para o ISS (40,75 ± 30,98 vs. 40,72 ± 36,19%, p=0,89), PB (1,73 ± 1,80 vs. 1,48 ± 0,59mm, p=0,80) e NI (2,47 ± 1,9 vs. 1,91 ± 1,34mm, p=0,18) e para a VHS (20,69 ± 23,88 vs. 23,41 ± 21,92 mm/h, p=0,80), a PCR (4,7 ± 4,61 vs. 4,21 ± 5,86mg/dl, p=0,34) e o SLEDAI (5,94 ± 4,24 vs. 6,29 ± 4,35, p=0,73). A eficácia do tratamento odontológico foi atestada pela redução dos índices periodontais no grupo TRATADO: ISS (40,75 ± 30,98 vs. 15,19 ± 17,22%, p<0,01), PB (1,73 ± 1,80 vs. 1,10 ± 0,29 mm, p<0,01) e NI (2,47 ± 1,96 vs. 1,68 ± 0,90 mm, p<0,01). Os níveis de VHS e PCR não se alteraram ao longo do tratamento para os grupos. O grupo TRATADO apresentou redução do SLEDAI (5,94 ± 4,24 vs. 3,38 ± 3,30, p=0,04). O grupo CONTROLE não alterou os parâmetros odontológicos e nem clínicos nos 3 meses em observação. CONCLUSÃO: O tratamento odontológico propiciou a melhora da doença periodontal nos pacientes com lúpus eritematoso sistêmico, associada a uma redução significativa na atividade da doença aferida pelo SLEDAI. / INTRODUCTION: Periodontal disease is an infectious disease associated to a chronic inflammation of dental tissues. Inflammatory mediators and cytokines determine the course of rheumatic diseases. The aim of this study is to evaluate if periodontal disease (PD) treatment influences systemic lupus erythematosus (SLE) activity. METHODS: Forty-two SLE patients (ACR, 1997) were evaluated and consecutively randomized in two groups. Exclusion criteria were SLEDAI < 2 and/or bleeding gingival index (BGI) of zero, resulting in TREATED group with 19 patients and CONTROL with 17 patients. All SLE patients were under IV cyclophosphamide therapy. Both groups were matched for age, gender, and race. Erythrocyte sedimentation rate (ESR), C- reactive protein (CRP) and SLEDAI were determined. Periodontal disease graduation was defined according to probing depth (PD), bleeding gingival index (BGI) and probing attachment level (PAL). Odontological treatment focused a complete mouth desinfection. TREATED group have odontologial treatment immediately at entry and evaluated after three months. CONTROL started odontological treatment after 3 months of observation period. At the end, all SLE patients with SLEDAI ³ 2 and/or BGI > zero, entered in the TREATED group (n=32). These patients were evaluated 3 months after the end of odontological treatment. RESULTS: At entry, both groups had similar BGI (40.75 ± 30.98 vs. 40.72 ± 36.19%, p=0.89), PD (1.73 ± 1.80 vs. 1.48 ± 0.59mm, p=0.80), and PAL (2.47 ± 1.9 vs. 1.91 ± 1.34mm, p=0.18) and also for ESR (20.69 ± 23.88 vs. 23.41 ± 21.92 mm/h, p=0.80), CRP (4.7 ± 4.61 vs. 4.21 ± 5.86mg/dl, p=0.34) and SLEDAI (5.94 ± 4.24 vs. 6.29 ± 4.35, p=0.73). Efficacy of odontological treatment was identified in the reduction of all indexes of TREATED group: BGI (40.75 ± 30.98 vs. 15.19 ± 17.22%, p<0.01), PD (1.73 ± 1.80 vs. 1.10 ± 0.29 mm, p<0.01) and PAL (2.47 ± 1.96 vs. 1.68 ± 0.90 mm, p<0.01). ESR and CRP did not alter during treatment in both groups. TREATED group had a significant reduction in SLEDAI (5.94 ± 4.24 vs. 3.38 ± 3.30, p=0.04) after odontological treatment whereas CONTROL had similar odontological and clinical parameters during the 3 months of observation. CONCLUSION: SLE patients after odontological treatment had a significant reduction of SLEDAI with a better control of the inflammation of the disease.

INTRODUÇÃO: A periodontite é uma doença infecciosa associada à inflamação crônica dos tecidos do dente. Os mediadores inflamatórios e citocinas podem influenciar o curso de doenças reumáticas. O objetivo deste trabalho foi verificar se o tratamento da doença periodontal (DP) possue correlação com a atividade do lúpus eritematoso sistêmico (LES). MÉTODOS: Foram avaliados 42 pacientes com LES (ACR, 1997) e consecutivamente randomizados em dois grupos. Os critérios de exclusão foram SLEDAI < 2 e/ou Índice de Sangramento Sulcular (ISS) igual a zero, obtendo-se o grupo TRATADO com 19 pacientes e o CONTROLE com 17 pacientes. Todos os pacientes estavam sob tratamento com ciclofosfamida endovenosa. Estes grupos foram pareados para idade, sexo, e raça. Foram determinados a velocidade de hemossedimentação (VHS), a proteína C reativa (PCR) e o SLEDAI. A graduação da doença periodontal foi aferida através da profundidade da bolsa periodontal (PB), do ISS e do nível de inserção (NI). O tratamento odontológico objetivou a desinfecção oral completa. O grupo TRATADO iniciou o tratamento odontológico imediatamente após a visita inicial e foram reavaliados após três meses. O grupo CONTROLE iniciou o tratamento odontológico após três meses de observação. Assim, todos os pacientes com SLEDAI ? 2 e/ou ISS ? zero, passaram a pertencer ao grupo TRATADO (n=32). Esses pacientes foram reavaliados após três meses do término do tratamento odontológico. RESULTADOS: Os grupos foram similares na visita inicial para o ISS (40,75 ± 30,98 vs. 40,72 ± 36,19%, p=0,89), PB (1,73 ± 1,80 vs. 1,48 ± 0,59mm, p=0,80) e NI (2,47 ± 1,9 vs. 1,91 ± 1,34mm, p=0,18) e para a VHS (20,69 ± 23,88 vs. 23,41 ± 21,92 mm/h, p=0,80), a PCR (4,7 ± 4,61 vs. 4,21 ± 5,86mg/dl, p=0,34) e o SLEDAI (5,94 ± 4,24 vs. 6,29 ± 4,35, p=0,73). A eficácia do tratamento odontológico foi atestada pela redução dos índices periodontais no grupo TRATADO: ISS (40,75 ± 30,98 vs. 15,19 ± 17,22%, p<0,01), PB (1,73 ± 1,80 vs. 1,10 ± 0,29 mm, p<0,01) e NI (2,47 ± 1,96 vs. 1,68 ± 0,90 mm, p<0,01). Os níveis de VHS e PCR não se alteraram ao longo do tratamento para os grupos. O grupo TRATADO apresentou redução do SLEDAI (5,94 ± 4,24 vs. 3,38 ± 3,30, p=0,04). O grupo CONTROLE não alterou os parâmetros odontológicos e nem clínicos nos 3 meses em observação. CONCLUSÃO: O tratamento odontológico propiciou a melhora da doença periodontal nos pacientes com lúpus eritematoso sistêmico, associada a uma redução significativa na atividade da doença aferida pelo SLEDAI. / INTRODUCTION: Periodontal disease is an infectious disease associated to a chronic inflammation of dental tissues. Inflammatory mediators and cytokines determine the course of rheumatic diseases. The aim of this study is to evaluate if periodontal disease (PD) treatment influences systemic lupus erythematosus (SLE) activity. METHODS: Forty-two SLE patients (ACR, 1997) were evaluated and consecutively randomized in two groups. Exclusion criteria were SLEDAI < 2 and/or bleeding gingival index (BGI) of zero, resulting in TREATED group with 19 patients and CONTROL with 17 patients. All SLE patients were under IV cyclophosphamide therapy. Both groups were matched for age, gender, and race. Erythrocyte sedimentation rate (ESR), C- reactive protein (CRP) and SLEDAI were determined. Periodontal disease graduation was defined according to probing depth (PD), bleeding gingival index (BGI) and probing attachment level (PAL). Odontological treatment focused a complete mouth desinfection. TREATED group have odontologial treatment immediately at entry and evaluated after three months. CONTROL started odontological treatment after 3 months of observation period. At the end, all SLE patients with SLEDAI ³ 2 and/or BGI > zero, entered in the TREATED group (n=32). These patients were evaluated 3 months after the end of odontological treatment. RESULTS: At entry, both groups had similar BGI (40.75 ± 30.98 vs. 40.72 ± 36.19%, p=0.89), PD (1.73 ± 1.80 vs. 1.48 ± 0.59mm, p=0.80), and PAL (2.47 ± 1.9 vs. 1.91 ± 1.34mm, p=0.18) and also for ESR (20.69 ± 23.88 vs. 23.41 ± 21.92 mm/h, p=0.80), CRP (4.7 ± 4.61 vs. 4.21 ± 5.86mg/dl, p=0.34) and SLEDAI (5.94 ± 4.24 vs. 6.29 ± 4.35, p=0.73). Efficacy of odontological treatment was identified in the reduction of all indexes of TREATED group: BGI (40.75 ± 30.98 vs. 15.19 ± 17.22%, p<0.01), PD (1.73 ± 1.80 vs. 1.10 ± 0.29 mm, p<0.01) and PAL (2.47 ± 1.96 vs. 1.68 ± 0.90 mm, p<0.01). ESR and CRP did not alter during treatment in both groups. TREATED group had a significant reduction in SLEDAI (5.94 ± 4.24 vs. 3.38 ± 3.30, p=0.04) after odontological treatment whereas CONTROL had similar odontological and clinical parameters during the 3 months of observation. CONCLUSION: SLE patients after odontological treatment had a significant reduction of SLEDAI with a better control of the inflammation of the disease.

Made available in DSpace on 2017-07-10T14:57:30Z (GMT). No. of bitstreams: 1 Claudio Girelli_ Junior.pdf: 1035740 bytes, checksum: 5744f2af3a9cdd7a97647cc399f302df (MD5) Previous issue date: 2015-02-24 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Testosterone is the principal male sex steroid hormone involved in differentiation, sexual development and control of male reproductive functions. In addition to its role in reproductive endocrinology and fertility, testosterone is an important hormone in the regulation and functioning of other organs and tissues including the kidney, heart, skeletal muscle, immune system and oral and periodontal tissues. Periodontitis is a disease characterized by inflammation of the periodontal tissues and associated with dental decay, are mainly responsible for the loss of dental elements. The relationship between sex steroids hormones and periodontal disease has been intensively investigated in females, however studies in males are still scarce. Therefore, the aim of the present project is to analyze the influence of testosterone deficiency on bone loss and histological structure of the periodontal tissues of castrated rats and experimental periodontitis. Twenty-eight male Wistar rats, provided by the Central Biotherium of Unioeste were used. At 80 days of age the animals were separated in four experimental groups, with 7 animals per group: no ligature control (CON), ligature control CON + LIG), no ligature castrated (CAST) and ligature castrated (CAST + LIG). At 90 days of age was held orchiectomy in appropriate groups. Sixty days after castration, the periodontal disease was induced by ligature technique. At the end of experimental period (90 days after castration), the animals were weighed and euthanized in a CO2 chamber. The mandible was removed, dissected, separated into left and right, were fixed by immersion in 10% buffered formalin for 24 hours, decalcified and processed for histological and radiological techniques. The results of this study showed that ligature model was effective 13 in inducing periodontitis in the animals. The food intake profile was similar between groups. The animals of CAST and CAST + LIG groups showed significant reduction in body weight at the end of experimental period, when compared with the groups CON and CON + LIG. Castration resulted in a significant bone loss in animals, which was accentuated with the induction of periodontal disease. Animals with periodontal diseases presented increased of gingival epithelium and connective tissue area, compared to animals without the disease. We conclude that testosterone is a physiological regulator important of alveolar bone metabolism. Testosterone deficiency in synergism with periodontal disease increases alveolar bone resorption and alters the thickness of gingival epithelium.Key / A testosterona é o principal hormônio sexual esteróide masculino envolvido na diferenciação, desenvolvimento sexual e controle das funções reprodutivas masculina. Além do seu papel na endocrinologia reprodutiva e fertilidade, a testosterona é um hormônio importante na regulação e funcionamento de outros órgãos e tecidos corporais tais como o rim, coração, músculo estriado esquelético, sistema imunológico e os tecidos orais e periodontais. A periodontite é uma doença caracterizada pelo processo inflamatório dos tecidos periodontais e juntamente com a cárie, são as grandes responsáveis pela perda de elementos dentais. As relações entre os hormônios sexuais esteróides e doença periodontal tem sido intensamente investigado em fêmeas, entretanto os estudos em machos ainda são escassos. Assim, o presente trabalho teve por objetivos analisar a influência da deficiência de testosterona sobre a perda óssea alveolar e estrutura histológica dos tecidos periodontais de ratos castrados e com periodontite experimental. Foram utilizados 28 ratos machos Wistar, fornecidos pelo Biotério Central da Unioeste. Aos 80 dias de idade os animais foram separados em quatro grupos experimentais, com 7 animais por grupo: controle sem ligadura (CON), Controle com ligadura (CON+LIG), castrado sem ligadura (CAST) e castrado com ligadura (CAST+LIG). Aos 90 dias de idade realizou-se a orquidectomia nos devidos grupos. Sessenta dias após a castração a doença periodontal foi induzida através da técnica de ligadura. Ao final do período experimental (90 dias após a castração), os animais foram pesados e sacrificados em câmara de CO2. As mandíbulas foram retiradas, dissecadas, separadas em direita e esquerda, fixada em formalina tamponada a 10% por 24 horas, descalcificada e 11 processadas para técnicas histológicas e radiológicas. Os resultados do presente trabalho demonstraram que o modelo de ligadura foi eficiente em induzir a periodontite nos animais. O perfil de consumo alimentar foi semelhante entre os grupos. Os animais dos grupos CAST e CAST+LIG apresentaram significativa redução do peso corporal ao final do período experimental, quando comparados aos grupos CON e CON+LIG. A castração levou a uma significativa perda óssea nos animais, a qual foi acentuada com a indução da doença periodontal. Os animais com doença periodontal apresentaram aumento de área do epitélio gengival e área de tecido conjuntivo, quando comparado aos animais sem a doença. Concluímos que a testosterona é um importante regulador fisiológico do metabolismo ósseo alveolar. A deficiência de testosterona em sinergismo com a doença periodontal aumenta a reabsorção óssea alveolar e altera a espessura do epitélio gengival.

The human jaw, like all other articulated body parts, exhibits small oscillatory movements during isometric holding tasks. These movements, known as physiological tremor, arise as a consequence of the interaction of various factors. One of these factors is reflex feedback from peripheral receptors. In the human jaw, receptors that innervate the periodontium are able to transduce minute changes in force. This thesis examines the contribution of these periodontal mechanoreceptors (PMRs) to the genesis of physiological tremor of the human jaw. By using frequency domain analysis of time series recorded during isometric biting tasks, the character of physiological jaw tremor can be revealed. Physiological jaw tremor was observed in force recorded from between the teeth as well as from electromyograms recorded from the principal muscles of mastication. These recordings have shown us that jaw physiological tremor consists of a frequency invariant component between 6 and 10Hz. This frequency remains unaltered under various load conditions where the mechanical resonance of the jaw would be expected to vary greatly (Chapter 2). Such findings indicate a ‘neurogenic’ origin for this tremor. A possible candidate for this neurogenic component of physiological tremor in the jaw is the reflex feedback arising from the PMRs. Using local anaesthetisation, it has been shown in this thesis, that by blocking outflow from the PMRs, the amplitude of neurogenic physiological jaw tremor can be reduced dramatically. This procedure caused a dramatic reduction in not only the mechanical recordings of tremor but also in the coupling between masseteric muscles bilaterally (Chapter 3) and between single motor units recorded from within a homonymous muscle (Chapter 4). The obvious mechanism by which periodontal mechanoreceptor anaesthetisation could reduce the amplitude of physiological tremor in the jaw would be by reducing the amplitude of the oscillatory input to the motoneurones driving the tremor. This interpretation remains controversial however as physiological tremor in the jaw can be observed at force levels above which the PMRs are supposedly saturated in their response. In light of this knowledge, the saturating characteristics of these receptors in terms of reflex output were examined. To do this, a novel stimulation paradigm was devised whereby the incisal teeth were mechanically stimulated with identical stimulus waveforms superimposed upon increasing tooth preloads. This necessitated the use of a frequency response method to quantify the reflexes. An optimal frequency for stimulation was identified and used to confirm that the hyperbolic saturating response of PMRs observed previously, translated to a similar phenomenon in masticatory reflexes (Chapter 5). These data reinforced the idea that physiological tremor in the jaw was not just a consequence of rhythmic reflex input from PMRs, as the dynamic reflex response uncoupled from the input as the receptor-mediated reflex response saturated. An alternative hypothesis was then developed that suggested the effect of PMR suppression in physiological tremor was via tonic rather than rhythmic effects on the masseteric motoneurone pool. By utilising a novel contraction strategy to manipulate the mean firing rate of the motor neuron pool at a given level of force production, data contained in Chapter 6 shows that population motor unit firing statistics influence the expression of physiological tremor, and such manipulations mimic, to an extent, the changes in firing statistics and tremor amplitude seen during anaesthetisation of the PMRs. This thesis therefore posits a mechanism whereby periodontal input influences the firing rate of motoneurones in such a way as to promote tremulous activity (Chapter 5). However, as this proposed mechanism did not explain the full extent of tremor suppression seen during PMR anaesthetisation it can therefore only be considered a contributing factor in a multifactor process. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1297555 / Thesis (Ph.D.) -- University of Adelaide, School of Molecular and Biomedical Science, 2007

The human jaw, like all other articulated body parts, exhibits small oscillatory movements during isometric holding tasks. These movements, known as physiological tremor, arise as a consequence of the interaction of various factors. One of these factors is reflex feedback from peripheral receptors. In the human jaw, receptors that innervate the periodontium are able to transduce minute changes in force. This thesis examines the contribution of these periodontal mechanoreceptors (PMRs) to the genesis of physiological tremor of the human jaw. By using frequency domain analysis of time series recorded during isometric biting tasks, the character of physiological jaw tremor can be revealed. Physiological jaw tremor was observed in force recorded from between the teeth as well as from electromyograms recorded from the principal muscles of mastication. These recordings have shown us that jaw physiological tremor consists of a frequency invariant component between 6 and 10Hz. This frequency remains unaltered under various load conditions where the mechanical resonance of the jaw would be expected to vary greatly (Chapter 2). Such findings indicate a ‘neurogenic’ origin for this tremor. A possible candidate for this neurogenic component of physiological tremor in the jaw is the reflex feedback arising from the PMRs. Using local anaesthetisation, it has been shown in this thesis, that by blocking outflow from the PMRs, the amplitude of neurogenic physiological jaw tremor can be reduced dramatically. This procedure caused a dramatic reduction in not only the mechanical recordings of tremor but also in the coupling between masseteric muscles bilaterally (Chapter 3) and between single motor units recorded from within a homonymous muscle (Chapter 4). The obvious mechanism by which periodontal mechanoreceptor anaesthetisation could reduce the amplitude of physiological tremor in the jaw would be by reducing the amplitude of the oscillatory input to the motoneurones driving the tremor. This interpretation remains controversial however as physiological tremor in the jaw can be observed at force levels above which the PMRs are supposedly saturated in their response. In light of this knowledge, the saturating characteristics of these receptors in terms of reflex output were examined. To do this, a novel stimulation paradigm was devised whereby the incisal teeth were mechanically stimulated with identical stimulus waveforms superimposed upon increasing tooth preloads. This necessitated the use of a frequency response method to quantify the reflexes. An optimal frequency for stimulation was identified and used to confirm that the hyperbolic saturating response of PMRs observed previously, translated to a similar phenomenon in masticatory reflexes (Chapter 5). These data reinforced the idea that physiological tremor in the jaw was not just a consequence of rhythmic reflex input from PMRs, as the dynamic reflex response uncoupled from the input as the receptor-mediated reflex response saturated. An alternative hypothesis was then developed that suggested the effect of PMR suppression in physiological tremor was via tonic rather than rhythmic effects on the masseteric motoneurone pool. By utilising a novel contraction strategy to manipulate the mean firing rate of the motor neuron pool at a given level of force production, data contained in Chapter 6 shows that population motor unit firing statistics influence the expression of physiological tremor, and such manipulations mimic, to an extent, the changes in firing statistics and tremor amplitude seen during anaesthetisation of the PMRs. This thesis therefore posits a mechanism whereby periodontal input influences the firing rate of motoneurones in such a way as to promote tremulous activity (Chapter 5). However, as this proposed mechanism did not explain the full extent of tremor suppression seen during PMR anaesthetisation it can therefore only be considered a contributing factor in a multifactor process. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1297555 / Thesis (Ph.D.) -- University of Adelaide, School of Molecular and Biomedical Science, 2007

Made available in DSpace on 2014-06-11T19:33:28Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-06-06Bitstream added on 2014-06-13T19:23:26Z : No. of bitstreams: 1 ruiz_kgs_dr_arafo.pdf: 357284 bytes, checksum: 93541a495590ca3b701f6cf9ef876131 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / O objetivo do presente estudo foi avaliar o efeito da combinação do fator de crescimento de fibroblastos básico (b-FGF) e fator de transformação de crescimento beta (TGF- beta) na proliferação, expressão de genes para colágeno tipos I e III, metaloproteases -1 e -2 e TIMPs 1, 2 e 3, e na síntese destes próprios fatores de crescimento pelas células do ligamento periodontal de humanos. A avaliação da proliferação celular foi realizada após os períodos de 24 e 48h na presença dos fatores de crescimento, através da mensuração do nível de MTS reduzido a formazan pelas células viáveis, e a síntese de b-FGF e TGF-b pelo teste ELISA empregando a técnica sandwich. Conclui-se que as associações do bFGF e do TGF-b atuaram de maneira dose-dependente no estímulo à proliferação celular, o aumento na expressão de genes para colágeno e TIMPs e redução para as metalproteases e modulação da síntese deles próprios. / The aim of this study was to evaluate the effect of association of basic fibroblast growth factor and transforming growth factor beta on the proliferation, expression of colagen type I e III, matrix metalloproteinases-1 e -2 e TIMPs 1, 2 e 3, and on the modulation of the syntheses oh these growth factors by humans periodontal ligament cells. The cellular proliferation was evaluated to 24 and 48 hours of incubation by the colorimetric method. The synthese of bFGF and TGF-ß was verificated by ELISA method, using a sandwich techinique, and mRNA expression by Real Time - PCR. In conlusion, the associations of bFGF e TGF-ß influenced of dose-dependent manner on the cellular proliferation, on the increasing of the expression to collagen and TIMPs, and on the reduction to metaloproteinases and, the modulation of these own synthesis.