玻璃纤维桩长度对上颌中切牙修复后抗折性能的影响。
Effect of the length of glass fiber posts on the fracture resistance of restored maxillary central incisors.
作者信息
Borelli Bruna, Sorrentino Roberto, Zarone Fernando, Ferrari Marco
机构信息
Department of Fixed Prosthodontics and Restorative Dentistry, Tuscany School of Dental Medicine, University of Florence and Siena, Italy.
出版信息
Am J Dent. 2012 Apr;25(2):79-83.
PURPOSE
To evaluate the influence of post length insertion on the fracture resistance of directly restored endodontically treated teeth.
METHODS
30 maxillary central incisors were restored with glass fiber posts and composite cores to produce groups with post lengths of (1) 5 mm, (2) 7 mm, and (3) 9 m. Specimens were loaded at 130 degrees (Instron). Fracture strengths were analyzed with the Kolmogorov-Smirnov Test to verify the normality of the data distribution and with ANOVA and Tukey's post hoc test at P < 0.05. Fracture patterns (restorable or unrestorable) were analyzed (Pearson's Chi-square test).
RESULTS
The average fracture resistance was: Group 1 = 366.4 N, Group 2 = 507.4 N and Group 3 = 509.9 N. No significant difference was found among the three groups for fracture resistance or for failure mode. The insertion length did not influence the fracture pattern; more restorable fractures were detected.
目的
评估桩长度对经根管治疗后直接修复牙齿抗折性的影响。
方法
选取30颗上颌中切牙，用玻璃纤维桩和复合树脂核进行修复，分为三组，桩长度分别为(1)5毫米、(2)7毫米和(3)9毫米。标本在130度角加载（英斯特朗万能材料试验机）。采用柯尔莫哥洛夫-斯米尔诺夫检验分析断裂强度以验证数据分布的正态性，采用方差分析和Tukey事后检验（P<0.05）。分析断裂模式（可修复或不可修复）（Pearson卡方检验）。
结果
平均抗折力为：第1组=366.4牛，第2组=507.4牛，第3组=509.9牛。三组之间在抗折力或失效模式方面未发现显著差异。桩的插入长度不影响断裂模式；检测到更多可修复的骨折。
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