Resposta pulpar de dentes de ratos após tratamento capeador direto com sistema adesivo monocomponente ou autocondicionante
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Data
2004-07-14
Autores
Favaretto, Lúcia Helena Denardi Roveroni [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O objetivo do trabalho foi avaliar a resposta pulpar de dentes de ratos a diferentes sistemas adesivos diretamente aplicados sobre exposições pulpares. Foram realizados preparos oclusais com exposição pulpar nos primeiros e segundos molares superiores. O grupo C (controle, n=34) recebeu como material capeador o cimento de hidróxido de cálcio Dycal, no E1 (n=31) foi aplicado o sistema adesivo Single Bond e no E2 (n=30) o sistema adesivo auto-condicionante One-up Bond F. Os materiais foram aplicados conforme especificações dos fabricantes e todas as cavidades restauradas com resina composta. Os animais foram sacrificados após sete, trinta e 45 dias e as polpas dentárias foram histologicamente avaliadas. Os dados foram analisados estatisticamente utilizando-se o teste exato de Fisher. Observou-se que aos sete dias não houve diferença entre C e E2 com relação à resposta inflamatória e à organização pulpar, predominando quadros de inflamação crônica focal e perdas odontoblásticas localizadas. O E1 demonstrou diferença estatisticamente significativa em relação ao E2, exibindo maior número de casos com necrose. Aos sete dias a contaminação bacteriana da polpa foi menor no grupo tratado com One-up, porém, todas as diferenças mencionadas foram perdidas com o decorrer do tempo, equiparando-se os três grupos aos 45 dias, período em que predominou a necrose pulpar. Houve um aumento no número de barreiras dentinárias formadas e na contaminação bacteriana do tecido pulpar com o aumento do tempo experimental. Concluiu-se que o tratamento capeador direto, conforme o modelo experimental empregado, demonstrou ser histologicamente insatisfatório, independentemente do material empregado.
The aim of this study was to evaluate the pupal response to different adhesives systems directly applied on mechanically exposed pulps in rats. The oclusal surfaces of first and second molars were prepared and the pulps exposed. In C (control group-n=34) pulps were capped with a calcium hydroxide paste (Dycal); E1 (n=31) received the Single Bond adhesive system and E2 (n=30) was treated with the self-etching One-up Bond F adhesive system. The materials were applied according to the manufacture's instructions and cavities were restored with Z100 composite resin. Animals were sacrificed after seven, thirty and 45 days and histological features of the dental pulp were evaluated. The Fisher test was used as statistical analysis. At seven days C and E2 presented similar inflammatory response and pulpal organization, showing focal chronic inflammation and localized odontoblast cell lost. E1 and E2 demonstrated statistically significant difference regarding to pulpal organization and inflammatory response; the former exhibiting much more necrosis. At seven days, bacterial contamination of the dental pulp was less evident with One-up Bond F. All these differences were lost with time and after 45 days, pulpal necrosis and bacterial contamination prevailed in the three groups. The formation of the dentin barrier was greater with time in the three groups. The results presented suggest negative effects of direct pulp capping on molar teeth of rats using Dycal, One-up Bond F and Single Bond, under the experimental conditions described.
The aim of this study was to evaluate the pupal response to different adhesives systems directly applied on mechanically exposed pulps in rats. The oclusal surfaces of first and second molars were prepared and the pulps exposed. In C (control group-n=34) pulps were capped with a calcium hydroxide paste (Dycal); E1 (n=31) received the Single Bond adhesive system and E2 (n=30) was treated with the self-etching One-up Bond F adhesive system. The materials were applied according to the manufacture's instructions and cavities were restored with Z100 composite resin. Animals were sacrificed after seven, thirty and 45 days and histological features of the dental pulp were evaluated. The Fisher test was used as statistical analysis. At seven days C and E2 presented similar inflammatory response and pulpal organization, showing focal chronic inflammation and localized odontoblast cell lost. E1 and E2 demonstrated statistically significant difference regarding to pulpal organization and inflammatory response; the former exhibiting much more necrosis. At seven days, bacterial contamination of the dental pulp was less evident with One-up Bond F. All these differences were lost with time and after 45 days, pulpal necrosis and bacterial contamination prevailed in the three groups. The formation of the dentin barrier was greater with time in the three groups. The results presented suggest negative effects of direct pulp capping on molar teeth of rats using Dycal, One-up Bond F and Single Bond, under the experimental conditions described.
Descrição
Palavras-chave
Materiais dentários, Hidroxido de calcio, Adesivos dentarios, Hidróxido de cálcio, Adesivos dentários, Calcium hydroxide, Dental pulp
Como citar
FAVARETTO, Lúcia Helena Denardi Roveroni. Resposta pulpar de dentes de ratos após tratamento capeador direto com sistema adesivo monocomponente ou autocondicionante. 2004. 212 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Odontologia de São José dos Campos, 2004.