Department of Endodontics, Affiliated Stomatological Hospital of Nanjing Medical University.
J Oral Sci. 2023 Oct 1;65(4):203-208. doi: 10.2334/josnusd.23-0050. Epub 2023 Aug 3.
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.
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.
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.
Under CECs, XPS preserves the original root canal anatomy, meanwhile it produces less apical debris than the other instruments.
比较 XP-endo Shaper（XPS）、ProTaper Gold（PTG）、ProTaper 手用器械（HPT）和 Hero Shaper 对缩窄根管腔（CECs）和传统根管腔（TECs）进行预备后，牙本质碎屑的根尖挤出量、根管偏移和成形能力。
根据根管形态和镍钛（Ni-Ti）器械，将 CECs 或 TECs 组进一步细分为 24 个组。使用 Myers 和 Montgomery 模型计算牙本质碎屑的根尖挤出量。使用 micro-CT 扫描牙齿的术前和术后图像，并构建和比较三维模型。
在 CECs 或 TECs 下，XPS 和 PTG 产生的根尖碎屑少于 HPT 和 Hero Shaper，形成的根管偏移也少于 HPT 和 Hero Shaper（P < 0.05）。在 CECs 下，XPS 组在 20°-35°曲率的圆形根管中产生的根尖碎屑少于 TCEs 下（P < 0.05）。在 TECs 下，四个测试器械的中心率均高于 CECs 下（P < 0.05）。在 CECs 下，HPT 和 Hero Shaper 的偏移量大于 TCEs 下（P < 0.05）。在所有组中，成形能力均无统计学差异。
在 CECs 下，XPS 保持原始根管解剖结构，同时产生的根尖碎屑少于其他器械。
