Comparison of Retention of Titanium Para Post Luted with MTA and Four Common Dental Cements; an in-vitro Study

Statement of the problem: When Root perforation occur in the middle third of the root, considerable canal length that would normally be available for post placement must be filled by the repair material, thus necessitating a considerably shorter post and leads to poorer retention. Purpose: the aim of the study was to comparison of retention of Titanium Para Post luted with MTA and four cements. Materials and Methods: One hundred recently extracted human sound mandibular premolars were selected and coronal portion of each tooth was removed. The roots were endodontically instrumented and assigned to ۵ groups (n=۲۰). In five groups, the specimens were obturated with gutta-percha/AH۲۶ and the post was cemented into the roots with one of five luting agents: zinc phosphate Harvard (group ZP), glass-ionomer GC (group GI), resin cement Panavia F۲.۰ (group PF۲), self-adhesive cement RelyX Unicem (group RU) and mineral trioxide aggregate White ProRoot (group MTA). In all specimens, parallel-sided titanium ParaPost was seated to a ۱۰ mm deep post space prepared with the corresponding size drill. The debonding force (Newton) was measured using a universal testing machine and the failure mode was evaluated by a stereomicroscope. Statistical analysis was performed by ANOVA and Tukey’s test (α=۰.۰۵). Results: The mean and standard deviation of post retention was ZP (۳۱۱.۳±۴۱.۰), GI (۲۸۹.۲±۳۵.۵), and PF۲ (۲۸۵.۰±۲۹.۵), RU (۱۹۱.۳±۲۱.۸) and MTA (۱۸۵.۰±۲۴.۴). The result of One-way ANOVA showed that there was a significant difference between groups retention value (p<۰.۰۵). Tukey test showed that although there is no significant difference between the retention of posts luted with ZP, GI and PF۲ they were significantly (p>۰.۰۵) higher than of luted with MTA and RU. Conclusion: The findings of this study showed the retention of posts luted with mineral trioxide aggregate were lower in compare with other common luting agents.