Revista de Odontologia da UNESP
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Revista de Odontologia da UNESP
Original Article

Análise das microfendas, fraturas dentinárias e desajustes por aplicação de pinos de retenção. Efeito de dobramento e distâncias

Analysis of dentinal fractures, gaps and disadjustments promoted by the retentive pins. Effect of bending

Pfeifer, J.M.G.A.; Gabrielli, F.; Dinelli, W.; Cândido, M.S.M.

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Resumo

O objetivo deste trabalho foi analisar as fraturas, microfendas dentinárias e os desajustes provocados por pinos de retenção para as restaurações. Também estudou-se o efeito do dobramento desses pinos. Foram utilizados seis diferentes tipos de pinos do sistema rosqueável e um do sistema por atrito. As análises foram efetuadas em dois cortes, transversal e longitudinal, de dentes molares recém extraídos, em lupa estereoscópica. Os resultados mostraram que a colocação de pinos provoca sempre algum tipo de alteração na dentina; que o dobramento dos pinos não induz maior porcentagem de alterações dentinárias e que distâncias maiores entre pinos tendem a reduzir o percentual de alterações. No corte transversal o pino rosqueável de menor diâmetro produz menor percentual de alterações e no corte longitudinal os pinos por atrito produzem menor proporção de microfendas e fraturas.

Palavras-chave

Pinos retentivos, fratura dentinária, desajuste pino/dentina

Abstract

The purpose of this study was to analyse the fractures, dentinal microscopic gaps and disadjustments promoted by restorative retention pins. The effect of bending the pins was also studied. Six different types threading pins and one attrition pin were used. The analyses were made upon two sections, transverse and longitudinal, of recently extracted molar teeth, by means of a stereomicroscope. The results showed that the utilization of pins always promote some kind of alteration of dentin and that the bending of the pin does not create a greater percentage of dentinal alterations. Also, greater distance between the pins tends to reduce that percentage. ln the transverse sectioning, the threading pin of smaller diameter produces a lesser percentage of alterations and the attrition pins, in the longitudinal sectioning, promote a lesser percentage of microfailures and fractures.

Keywords

Retentive-pins, dentinal gaps, dentinal fractures and disadjustments

References

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