Indução experimental de anacorese no periápice de dentes após obturação dos canais. Estudo em cães em região geográfica endêmica para Leishmaniose

Dezan, Elói

doi:10.11606/t.25.2001.tde-21122004-171310

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“…It is known that this phenomenon, named anachoresis, consists in the permanence of circulating microorganisms, foreign proteins and other substances in inflammatory areas 6 . By means of this hypothesis, we may deduce that cavity preparations with pulp exposure become favorable to anachoresis, where microorganisms may persist or even collaborate for more bacterial colonizations.…”

Section: Discussionmentioning

confidence: 99%

Biological response of pulps submitted to different capping materials

et al. 2006

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Pulp capping is a procedure that comprises adequate protection of the pulp tissue exposed to the oral environment, aiming at the preservation of its vitality and functions. This study evaluated the response of the dental pulps of dog teeth to capping with mineral trioxide aggregate (MTA) or calcium hydroxide P.A. For that purpose, 37 teeth were divided into two groups, according to the capping material employed. Two dogs were anesthetized and, after placement of a rubber dam, their pulps were exposed in a standardized manner and protected with the experimental capping materials. The cavities were then sealed with resin-modifi ed glass ionomer cement and restored with composite resin. After sixty days, the animals were killed and the specimens were processed in order to be analyzed with optic microscopy. It was observed that MTA presented a higher success rate compared to calcium hydroxide, presenting a lower occurrence of infection and pulp necrosis. DESCRIPTORS:Dental pulp capping; Biocompatible materials; Calcium hydroxide. RESUMO:O capeamento pulpar é um procedimento que consiste na adequada proteção do tecido pulpar exposto ao meio oral, objetivando a preservação de sua vitalidade e suas funções. O objetivo deste trabalho foi observar a resposta da polpa dental de cães ao capeamento com o agregado de trióxido mineral (MTA) ou hidróxido de cálcio P.A. Para tanto, 37 dentes foram divididos em dois grupos, de acordo com o material capeador utilizado. Dois cães foram anestesiados e após o isolamento absoluto do campo operatório, realizou-se exposição padronizada da polpa, proteção com os materiais capeadores testados e selamento das cavidades com cimento modifi cado de ionômero de vidro. Os dentes foram então restaurados com resina composta. Após sessenta dias, os animais foram sacrifi cados e as peças foram processadas para a análise microscópica dos dentes. Observou-se que o MTA apresentou maior índice de sucesso em relação ao hidróxido de cálcio, evidenciando menor ocorrência de infecção e necrose pulpar. DESCRITORES:Capeamento da polpa dentária; Materiais biocompatíveis; Hidróxido de cálcio. INTRODUCTIONPulp capping comprises adequate protection of a vital pulp exposed to the oral environment. It is a technique that aims at preserving the vitality of this tissue, thus avoiding more invasive endodontic procedures.Within this context, a great advancement for the achievement of a biologically acceptable treatment was the advent of a material which has been demonstrated to lead pulp cells to stimulate deposition of a hard tissue bridge fundamentally constituted of granulomatous areas, dystrophic calcification and dentin 10,26 . Some investigators emphasize that the material of choice for achievement of this outcome is calcium hydroxide, and especially calcium hydroxide P.A.12 . However, new materials have been employed for the protection of exposed pulps. These include the mineral trioxide aggregate (MTA), whose primary components are tricalcium silicate, tricalcium aluminate, calcium oxide and silicat...

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Section: Discussionmentioning

confidence: 99%