Al Amri Mohammad D, Al-Johany Sulieman, Sherfudhin Haneef, Al Shammari Badar, Al Mohefer Sami, Al Saloum Mohammed, Al Qarni Hatem
Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Department of Dentistry, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.
Aust Endod J. 2016 Dec;42(3):124-131. doi: 10.1111/aej.12148. Epub 2016 Mar 16.
The aim was to investigate in vitro the fracture resistance (FR) of endodontically treated teeth (ETT) with conservative access cavity restored using various direct and indirect restorative materials and techniques. Seventy-two mandibular first molars were equally divided into six groups. Teeth in Group 1 were untreated (controls). In Groups 2, 3, 4, 5 and 6, teeth were restored with amalgam, composite resin, ceramic inlay, ceramic onlay and zirconium crown, respectively. A fracture test was performed on all teeth using a static load. Compared with other groups, teeth in Groups 3 (P < 0.05) and 6 (P < 0.05) had the highest FR values with no significant difference in-between them. Teeth in Group 4 had the lowest FR than other groups (P < 0.05). All restorative techniques tested led to a significant reduction in FR. It is necessary to consider type of fracture when evaluating fracture resistance of endodontically treated teeth. Crowned molars had the highest favourable fractures among the five treatment groups. Although the results of this in vitro study showed variations between tested techniques in ETT with a conservative access cavity, further long-term controlled clinical trials are required to confirm these in vitro findings.
目的是在体外研究使用各种直接和间接修复材料及技术修复保守开髓洞型的根管治疗牙（ETT）的抗折性（FR）。72颗下颌第一磨牙平均分为6组。第1组牙齿未治疗（作为对照）。第2、3、4、5和6组牙齿分别用银汞合金、复合树脂、陶瓷嵌体、陶瓷高嵌体和锆冠修复。对所有牙齿进行静载抗折试验。与其他组相比，第3组（P < 0.05）和第6组（P < 0.05）的牙齿FR值最高，两组之间无显著差异。第4组牙齿的FR低于其他组（P < 0.05）。所有测试的修复技术均导致FR显著降低。在评估根管治疗牙的抗折性时，有必要考虑骨折类型。在五个治疗组中，带冠磨牙的有利骨折发生率最高。尽管这项体外研究的结果显示，在保守开髓洞型的根管治疗牙中，测试技术之间存在差异，但仍需要进一步的长期对照临床试验来证实这些体外研究结果。
