Sedgley C M, Messer H H
J Endod. 1992 Jul;18(7):332-5. doi: 10.1016/S0099-2399(06)80483-8.
This study compared biomechanical properties (punch shear strength, toughness, hardness, and load to fracture) of 23 endodontically treated teeth (mean time since endodontic treatment: 10.1 yr) and their contralateral vital pairs. Analyses using paired t tests revealed no significant differences in punch shear strength, toughness, and load to fracture between the two groups. Vital dentin was 3.5% harder than dentin from contralateral endodontically treated teeth (p = 0.002). The similarity between the biomechanical properties of endodontically treated teeth and their contralateral vital pairs indicates that teeth do not become more brittle following endodontic treatment. Other factors may be more critical to failure of endodontically treated teeth.
本研究比较了23颗经根管治疗的牙齿（根管治疗后的平均时间：10.1年）及其对侧健康对照牙的生物力学性能（冲剪强度、韧性、硬度和断裂载荷）。采用配对t检验分析发现，两组之间的冲剪强度、韧性和断裂载荷无显著差异。健康牙本质比来自对侧经根管治疗牙齿的牙本质硬3.5%（p = 0.002）。经根管治疗的牙齿与其对侧健康对照牙的生物力学性能相似，表明根管治疗后牙齿不会变得更脆。其他因素可能对经根管治疗牙齿的失败更为关键。
