Comparative study of retention of fiber-reinforced post at middle and cervical one thirds of root canal cemented by self adhesive resin and polycarboxylate cement measured at different times

الملخص EN

The purpose of this study was to compare regional bond strength at middle and cervical thirds of the root canal among glass fiber-reinforced composite (FRC) endodontic posts cemented with different cements, using the push-out test to compare the performance (retention) of two types of luting cements ; polycarboxylate cement and resin cement used to cement translucent fiber post and to compare the result of the push-out test at different storage times ;1 week, 1month and 2 months.

Sixty caries-free, recently extracted single-rooted human teeth with straight root canals was used in this study, The root canals were end odontically instrumented at a working length of 0.5 mm from the apex by means of conventional instruments for hand use (Dentsply, Switzerland) up to size 35.then root canal filling was performed followed by post space preparation up to 8mm including cervical and middle one third of root canal then the fiber post was cemented into canal post space then the root was sectioned to get cervical (4 mm in length) and middle (4 mm in length) thirds ,these thirds were examined by push out test to get values of retention of fiber post inside these canal thirds .The results of this study.

Showed that there was no significant differences between push out bond strength between fiber post and root at cervical third as compared with middle third when using polycarboxylate cement to cement the fiber post to the canal walls but there was highly significant differences between push out bond strength between fiber post and root at cervical third as compared with middle third when using the self-adhesive to cement the fiber post to the canal walls also the results showed that there was higher significant more push out bond strength for resin cement as compared with polycarboxylate cement, and the results showed that there was no significant differences in push out bond strength for polycarboxylate after one and two months but there was highly significantly increase in push out bond strength for resin cements used to cement the fiber post to the root canal after one and two months.