Intra-canal XXXX removal by two rotary systems: A comparative study.

@entity1 @entity15383 @entity1548 @entity6086 @entity346
AIM: The presence of @entity6086 ( @entity15383 ) in the root canal interferes with the apical root canal sealing and may result in @entity1548 in the long run. The present study was aimed to compare the efficacy of two rotary systems of Race and Mtwo in the removal of @entity15383 aqueous-based from distobuccal canals of @entity1 maxillary molars. MATERIALS AND METHODS: A total of 44 distobuccal root canals of @entity1 maxillary molars were randomly distributed into two groups of 20 canals each and two control groups. Specimens in each group were instrumented with similar master @entity346 (MAR) and flexible files according to the manufacture's guidelines. The @entity15383 paste was placed in canals using # 20 lentulo and radiographs were taken from the two dimensions. The roots were incubated for 1 week at 37  C and 100% humidity and @entity15383 was removed from canals by MAR, afterward. Then, the roots were longitudinally split in halves by diamond disk and chisel without entering the root canals. Photos were taken from the canals' walls by a stereomicroscope with * 10 magnification. Next, according to a defined scoring system, photos were scored by four endodontists, so that scores 1 and 2 (nonvisible remnants or scattered remnants of @entity15383 ) were considered as acceptable and scores 3 and 4 (distinct mass or densely-packed mass of @entity15383 ) were regarded as nonacceptable. RESULTS: The obtained findings indicated that in coronal, middle, and apical portions of the root canal, 45, 60, and 65% of Mtwo specimens and 40, 50, and 55% of specimens prepared by the Race system acquired an acceptable score (1 and 2), respectively. Moreover, the results showed no significant difference between the two groups (P > 0.05). CONCLUSIONS: Both Mtwo and Race rotary systems with acceptable removal efficiency (score 1 and 2) were similarly able to remove @entity15383 .
