Apically extruded debris, canal transportation, and shaping ability of nickel-titanium instruments on contracted endodontic cavities in molar teeth

• Published in: Journal of Oral Science 2023, Vol.65(4), pp.203-208
• Main Authors: Zhang, Qinqin, Gu, Jingyi, Shen, Jiadi, Ma, Ming, Lv, Ying, Wei, Xin
• Format: Article
• Language: English
• Subjects: apically extruded debris; canal transportation; contracted endodontic cavities; Ni-Ti instrument; shaping ability; traditional endodontic cavities
• ISSN: 1343-4934; 1880-4926
• DOI: 10.2334/josnusd.23-0050

Purpose: Apically extruded debris, canal transportation and shaping ability were compared between contracted endodontic cavities (CECs) and traditional endodontic cavities (TECs) after instrumentation with XP-endo Shaper (XPS), ProTaper Gold (PTG), ProTaper for hand-use (HPT) and Hero Shaper.Methods: The CECs or TECs groups were sub-divided into 24 groups according to root canal morphology and nickel-titanium (Ni-Ti) instruments. The weight of apically extruded debris was calculated using the Myers and Montgomery model. Pre- and postoperative images of teeth were scanned using micro-CT and the three-dimensional models were constructed and compared.Results: Under CECs or TECs, XPS and PTG produced less apical debris and formed less canal transportation than HPT and Hero Shaper (P < 0.05). XPS group under CECs extruded less apical debris than that under TCEs for round canals with curvature of 20°-35° (P < 0.05). The centering ratios of four tested instruments were higher under TECs than those under CECs (P < 0.05). The HPT and Hero Shaper had more transportation under CECs than that under TCEs (P < 0.05). No statistical difference was found regarding shaping ability among all the groups.Conclusion: Under CECs, XPS preserves the original root canal anatomy, meanwhile it produces less apical debris than the other instruments.