Sorrentino Roberto, Monticelli Francesca, Goracci Cecilia, Zarone Fernando, Tay Franklin R, García-Godoy Franklin, Ferrari Marco
Department of Dental Materials and Restorative Dentistry, University Siena, Policlinico Le Scotte, Italy.
Am J Dent. 2007 Aug;20(4):269-74.
To compare the fracture resistance and failure patterns of endodontically-treated teeth with a progressively reduced number of residual walls restored using resin composites, with or without translucent glass fiber posts.
Ninety extracted human single-rooted maxillary premolars were used. After endodontic treatment, the following groups were created: Group 1 (control group): endodontically-treated single-rooted maxillary premolars with four residual walls; Group 2: three residual walls; Group 3: two residual walls; Group 4: one residual wall, and Group 5: no residual wall. Groups 2-5 were each divided into two subgroups: subgroups "a" were restored with resin composites, while subgroups "b" were restored with translucent glass fiber posts and resin composites. Static fracture resistance tests and statistical analyses (P= 0.05) were performed.
The mean failure loads (N) were 502.4+/-152.5 (Group 1), 416.4+/-122.2 (Group 2a), 423.0+/-103.3 (Group 2b) 422.1+/-138.9 (Group 3a) 513.2+/-121.7 (Group 3b), 488.7+/-153.7 (Group 4a) 573.4+/-169.2 (Group 4b), 856.7+/-112.2 (Group 5a) and 649.5+/-163.5 (Group 5b), respectively. The samples restored with fiber posts exhibited predominantly restorable fractures. The number of residual cavity walls influenced the mechanical resistance of endodontically-treated teeth.
比较使用树脂复合材料修复时，根管治疗后的牙齿在剩余壁数量逐渐减少的情况下，有无半透明玻璃纤维桩时的抗折性和失败模式。
使用90颗拔除的人单根上颌前磨牙。根管治疗后，创建以下几组：第1组（对照组）：根管治疗后的单根上颌前磨牙，有四个剩余壁；第2组：三个剩余壁；第3组：两个剩余壁；第4组：一个剩余壁；第5组：无剩余壁。第2 - 5组每组再分为两个亚组：亚组“a”用树脂复合材料修复，亚组“b”用半透明玻璃纤维桩和树脂复合材料修复。进行静态抗折性测试和统计分析（P = 0.05）。
平均破坏载荷（N）分别为502.4±152.5（第1组）、416.4±122.2（第2组a）、423.0±103.3（第2组b）、422.1±138.9（第3组a）、513.2±121.7（第3组b）、488.7±153.7（第4组a）、573.4±169.2（第4组b）、856.7±112.2（第5组a）和649.5±163.5（第5组b）。用纤维桩修复的样本主要表现为可修复性骨折。剩余髓腔壁的数量影响根管治疗后牙齿的机械抗力。
