(PO101) Evaluation of Cervical Dentin Thickness After Orifice Shaping in Maxillary Premolars: A Micro CT Study

Abstract: This study aimed to compare the effects of three distinct orifice shapers on cervical dentin thickness. For this ex vivo study, 12 extracted 2-rooted maxillary first premolars were used. The teeth were categorized into three groups: the Gates Glidden group, the Protaper Gold SX group, and the 20-06 rotary file group. Each tooth was scanned using a SkyScan model 1173 micro-CT scanner both before and after shaping the buccal canal. Subsequently, the thickness of the dentin was recorded and analyzed. Significant variances were noted in the total volume post-procedure across the three file systems (p = .0004). The average amount of dentin removed was as follows: 0.36 mm^3 for the 20-06 rotary file system, 0.86 mm^3 for Protaper Gold SX, and 1.30 mm^3 for Gates Glidden. All individual comparisons showcased significant differences after adjusting for multiple comparisons via the Tukey-Kramer test. This study revealed that the Gates Glidden instrument removed more cervical dentin compared to the Protaper Gold SX orifice opener. Moreover, the Protaper Gold SX orifice opener removed more cervical dentin than the 20-06 rotary file.