Comparison of root canal preparation using Two rotary Ni-Ti instruments (An In Vitro Study)

Abstract

Root canal success is dependent upon two major factors: cleaning and shaping. Proper cleaning is essential in order to provide an adequate seal and to prevent failure. The goal of shaping the canal is to develop a continuously shaped three-dimensional conical form from the apex of the root to the crown. During shaping, it is critical that the canal anatomy be maintained, tooth structure be conserved. The purpose of this study was to assess and compare the shaping and cleaning ability of the recently introduced PTG system with the PTU rotary system, sixty human permanent mandibular first molars with mature apices having angles of curvature of the mesial root less than25° degree were collected ,Accessed,mounted in four large acrylic resin block, two for the Protaper Gold file and the other two for the Protaper Universal files. Blocks were scanned by Cone beam Computed Tomography and the images were stored for pre-instrumentation measurements. Instrumentation of the mesiobuccal canals were prepared for each group till size F2 according to manufacturer recommendations. All the samples then were scanned with CBCT and the images were stored for post-instrumentation measurements. The roots were then grooved and split longitudinally. The amounts of debris and were evaluated at the apical, middle and coronal regions under the Stereomicroscope.The data was tabulated and statistically analysed using unpaired t-test and ANOVA test. The results showed that in the study there was no significant difference between the two groups regarding canal centering ability and change in angle of curvature of the canals. For cleaning ability there was no different between the two groups regarding percentage of the debris but there were differences among different regions within the same group.best cleanness was obtained at the cervical area and the worst was apicaly.