(PR083) Comparative Study of Four Endodontic Rotary Systems to Assess Fitting of Matching Gutta Percha Cones to Prepared Working Length in Teeth with Varying Canal Curvatures

Nickel titanium (NiTi) rotary instruments allow clinicians to prepare complex canals. However, clinicians often face difficulties fitting master gutta-percha (GP) cones to the prepared working length (WL), especially in curved canals. Variability in the tip diameter and taper of NiTi rotary files/GP cones across manufacturers may be a contributing factor. This study aimed to compare the shaping ability and fit of matching GP cones of four different NiTi rotary systems (Vortex Blue, EdgeFile X7, ProTaper Gold, and WaveOne Gold) in a variety of canal curvatures. To assess this, 92 canals from 63 extracted teeth were screened using CBCT and divided into three categories based on Schneider classification: 1) 0-5 degrees, 2) >5-20 degrees, and 3) >20 degrees. Canals were instrumented to size 25 following manufacturer’s recommendations. After instrumentation, the corresponding master GP cones were placed. The difference between actual length (AL) of the master cone at the reference point and measured WL was calculated. All instrumentation and measurements were performed under a dental operating microscope. The results showed that the WaveOne Gold System had the highest percentage where AL of matching GP equaled measured WL (83.33%) in curved canals. This indicated WaveOne Gold may be superior to other rotary systems; however, these findings were not statistically significant (P=0.0729). Further investigation is needed to determine the efficacy of various rotary systems in teeth with curved canals, as this could potentially improve treatment predictability and efficiency for endodontic procedures.