<span lang="EN-GB">Fracture resistance of endodontically treated teeth using ProTaper NEXT rotary and R-Motion reciprocating file systems

Objective: This study compared the fracture resistance of mandibular premolars instrumented using the ProTaper NEXT rotary and R-Motion reciprocating nickel-titanium file systems.Methods: In this in vitro study, ۴۵ extracted single-rooted mandibular premolars were decoronated to obtain standardized root lengths of ۱۳ mm. The teeth were randomly allocated to three groups (n = ۱۵). Group I served as the uninstrumented control group. Groups II and III were instrumented using the ProTaper NEXT rotary and R-Motion reciprocating file systems, respectively. The canals were then obturated using the lateral compaction technique. A vertical load was applied to each specimen until fracture occurred. Data were analyzed using one-way analysis of variance (ANOVA), followed by Tukey’s post hoc test, with significance set at P < ۰.۰۵.Results: A statistically significant difference in fracture resistance was found among the groups (P = ۰.۰۰۶). The uninstrumented control group showed the highest mean fracture resistance (۷۵۸.۰ ± ۱۴۹.۶ N), followed by the R-Motion reciprocating group (۷۳۱.۹ ± ۱۲۳.۶ N) and the ProTaper NEXT rotary group (۵۹۵.۶۵ ± ۱۴۶.۰۶ N). No statistically significant difference was found between the uninstrumented control and R-Motion groups (P = ۰.۰۸۶). The ProTaper NEXT group exhibited significantly lower fracture resistance than both the uninstrumented control group (P = ۰.۰۰۸) and the R-Motion group (P = ۰.۰۲۹).Conclusions: Within the limitations of this in vitro study, the R-Motion reciprocating file system maintained fracture resistance comparable to that of the uninstrumented control group and significantly higher than that of the ProTaper NEXT rotary file system.

کلیدواژه ها:

Dental instruments ، endodontically treated teeth ، fracture resistance ، Root Canal Therapy ، Shape memory alloys ، Tooth fractures