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Master's Dissertation
DOI
https://doi.org/10.11606/D.25.2020.tde-22102021-154114
Document
Author
Full name
Carolina Yoshi Campos Sugio
Institute/School/College
Knowledge Area
Date of Defense
Published
Bauru, 2020
Supervisor
Committee
Neppelenbroek, Karin Hermana (President)
Lopes, José Fernando Scarelli
Porto, Vinícius Carvalho
Urban, Vanessa Migliorini
Title in Portuguese
Resposta tecidual em modelo animal de condicionador de tecido contendo complexo de inclusão antifúngico:-ciclodextrina para tratamento de estomatite protética
Keywords in Portuguese
Ciclodextrinas
Clorexidina
Estomatite sob Prótese
Nistatin,; Reembasadores de Dentadura
Toxicidade
Abstract in Portuguese
O objetivo do presente estudo foi avaliar em modelo animal a resposta tecidual após indução de estomatite protética (EP) na mucosa palatina de ratos, com posterior tratamento por meio de dispositivos intraorais (DIOs) reembasados com condicionador tecidual modificado pelas concentrações inibitórias mínimas (CIMs) ao biofilme de Candida albicans de fármacos em suas formas puras ou complexadas com - ciclodextrina. Ratos machos Wistar (N=37) foram divididos em oito grupos experimentais: Cn (controle negativo, sem EP), De (uso de DIO estéril, sem EP), EP (controle positivo, com EP, uso de DIO), Soft (com EP, uso do DIO com condicionador tecidual Softone, sem fármaco), Clx (com EP, tratados com DIO reembasado com Softone modificado pela CIM de clorexidina), Nis (com EP, tratados com DIO reembasado com Softone modificado pela CIM de nistatina), Clx:CD (com EP, tratados com DIO reembasado com Softone modificado pela CIM de clorexidina:- ciclodextrina), and Nis:CD (com EP, tratados com DIO reembasado com Softone modificado pela CIM do complexo de inclusão nistatina:-ciclodextrina). Após a indução (ou não- Cn) de EP com o uso por 4 dias de DIOs contaminados com C. albicans, os ratos tiveram seus DIOs reembasados ou não com Softone sem ou com as CIMs de Nis ou Clx em suas formas puras ou complexadas. Após 2 dias, os animais foram eutanasiados e a região palatina entre molares foi submetida às seguintes análises: morfohistopatológica qualitativa descritiva e ordinal por escores e histométrica por planimetria computadorizada. As variáveis foram correlacionadas estatisticamente utilizando o teste de Correlação de Pearson. Os resultados evidenciaram que os Grupos Cn e De foram histopatologicamente semelhantes entre si, apresentando tecido epitelial sem qualquer alteração. No Grupo EP, houve modificações epiteliais compatíveis com o quadro da doença, tanto na análise morfohistopatológica, quanto na histométrica por planimetria computadorizada. Em relação às diferentes formas de tratamento testadas, o Grupo Soft se apresentou histopatologicamente similar ao Grupo EP, sugerindo persistência da inflamação. Nos grupos testados com a incorporação de fármacos (Clx, Nis, Clx:CD e Nis:CD), todas as amostras mostraram diminuição da inflamação tecidual ou recuperação histopatológica completa dos tecidos, evidenciando um epitélio compatível com o sadio. O teste de Correlação de Pearson revelou, na maioria das vezes, relação linear forte entre os escores atribuídos às amostras e as mensurações obtidas na análise histométria por planimetria computadorizada. Foi possível concluir que o tratamento da EP utilizando reembasamento dos DIOs com condicionador tecidual modificado pela incorporação das CIMs de antifúngicos em suas formas puras ou complexadas com -ciclodextrina mostrou recuperação tecidual nos aspectos histopatológicos do palato dos animas, podendo ser uma alternativa terapêutica promissora. No entanto, concentrações muito inferiores dos antifúngicos complexados foram necessárias para se obter o mesmo grau de resposta tecidual em relação aos fármacos puros, o que pode representar clinicamente menor potencial de toxicidade e efeitos adversos à saúde do paciente.
Title in English
Keywords in English
Chlorhexidine
Cyclodextrins
Denture
Denture liners
Nystatin
Stomatitis
Toxicity
Abstract in English
The objective of the present study was to evaluate in an animal model the tissue response after denture stomatitis (DS) induction in the palatal mucosa of rats, with subsequent treatment using intraoral devices (IODs) relined with tissue conditioner modified by minimal inhibitory concentrations (MICs) to the Candida albicans biofilm of drugs in their pure or complexed forms with -cyclodextrin. Male Wistar rats (N = 37) were divided into eight experimental groups: Nc (negative control, without EP), Sd (use of sterile DIO, without EP), DS (positive control, with DS, use of IOD), Soft (with DS, use of IOD relined with tissue conditioner Softone, without drug), Chx (with EP, treated with IOD relined with Softone modified by the MIC of chlorhexidine), Nys (with DS, treated with IOD relined with Softone modified by the MIC of nystatin), Chx:CD (with DS, treated with IOD relined with Softone modified by the MIC of chlorhexidine:- cyclodextrin) and Nys:CD (with EP, treated with IOD relined with Softone modified by the MIC of the nystatin inclusion complex Nys:-cyclodextrin). After induction (or not - Nc) of DS with the use for 4 days of DIOs contaminated with C. albicans, the rats had their IODs relined or not with Softone without or with the MICs of Nys or Chx in their free or complexed forms. After 2 days, the animals were euthanized and the palatal region between molars was subjected to the following analyzes: descriptive morphohistopathological and ordinal scores, and histometric by computerized planimetry. The variables were statistically correlated using the Pearson's Correlation test. The results showed that Groups Nc and Sd were histopathologically similar to each other, displaying epithelial tissue without any alteration. In Group DS, there were epithelial changes compatible with the disease, both in morphohistopathological and histometric analysis using computerized planimetry. In relation to the different forms of treatment tested, Group Soft presented similar histopathological findings to Group DS, which suggested persistence of inflammation. In the other groups tested with the drug incorporation (Chx, Nys, Chx:CD, and Nys:CD), all samples showed a decrease in tissue inflammation or complete histopathological recovery of the tissues, with an epithelium compatible with the healthy one. Pearson's Correlation test showed, in most cases, a strong linear relation between the scores attributed to the samples and the measurements obtained in the histometric analysis by computerized planimetry. It was possible to conclude that the treatment from the relining of IODs with tissue conditioner modified by the incorporation of MICs of antifungals in their pure or complexed forms with -cyclodextrin showed tissue recovery in the histopathological aspects of the animals' palate, which can be a promising therapeutic alternative. However, much lower concentrations of complexed antifungals were necessary to obtain the same degree of tissue response compared to pure drugs, which may represent clinically less potential for toxicity and adverse effects on the patient's health.
 
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Publishing Date
2021-10-22
 
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