EFFECT OF SEALER, CEMENT TYPES AND TIME OF CEMENTATION ON CUSTOM - CAST POST RETENTION

الملخص

Objective: The purposes of this in vitro study were to evaluate and compare the retention ability of custom-made metal posts using two types of cements, and determine the effect of two types of sealers and different cementation times on posts retention.
Materials and Methods: A total of eighty extracted human teeth randomly divided into two groups; all roots prepared using step-back technique & obturated by cold lateral compaction technique but first group (40 roots) with Zinc oxide eugenol sealer and the second group (40 roots) with resin sealer; each group was subdivided randomly into two groups (A & B) of 20 roots for each; in group Aposts cemented by Zinc polycarboxylate cement, and in group B- posts cemented
by resin cement. Groups A & B were further divided into two groups; one with immediate cementation and other with delayed cementation with 10 roots for each. All post space preparations were done by using Peeso reamer. The posts were
fabricated by direct waxing of the canals of 7mm length; base metal post & ringlike core were obtained. The ring was grasped by the clamping apparatus in Universal Testing Machine until dislodgement of the post from the root.
Results: By using t- test, there were highly significant differences between the delayed and immediate cementation time groups, the resin and zinc polycarboxylate cement groups and also between the resin sealer and zinc oxide eugenol sealer groups at p< 0.01
Conclusion: As conclusion, the delayed cementation time and resin cement type had better retention. The use of eugenol-containing sealer had bad effect on the retention of cemented posts.