臼齿
万能试验机
材料科学
断裂(地质)
蒸馏水
玻璃纤维
牙科
复合数
尖点(奇点)
纤维增强复合材料
牙齿骨折
纤维
复合材料
口腔正畸科
极限抗拉强度
化学
数学
医学
色谱法
几何学
作者
Maria Cecilia Gomes Beltrão,Ana Maria Spohr,Hugo Mitsuo Silva Oshima,Eduardo Gonçalves Mota,Luiz Henrique Burnett
出处
期刊:American Journal of Dentistry
日期:2009-02-01
卷期号:22 (1): 9-13
被引量:4
摘要
PURPOSE To assess the effect of a horizontally transfixed fiber glass post placed between buccal and palatal surfaces, on the fracture strength of endodontically treated molar teeth with MOD cavities, either restored with resin-based composite, or not. METHODS 75 sound maxillary human third molars were extracted, embedded in acrylic resin blocks and randomly assigned to five groups (n=15). Group A (sound teeth), (control) and Groups B, C, D and E, which were subjected to the following procedures after endodontic treatment: GB--(MOD+Endo), GC--(MOD+Endo+Post), GD--MOD and composite restoration (MOD+Endo+CR), GE--(MOD+Endo+Post+CR). The specimens were stored in distilled water at 37 degrees C for 24 hours. Later, a compressive force was applied by means of a universal testing machine at 1 mm/minute speed, parallel to the long axis of the teeth until fracture occurred. RESULTS The means of the results (N) followed by the same letter represent no statistical difference by ANOVA and Tukey (P<0.05): GA = 4289.8 (+/- 1128.9)a, GB = 549.6 (+/- 120.7)b, GC = 1474.8 (+/- 338.1)c, GD = 1224.7 (+/- 236.0)c, GE = 2645.4 (+/- 675.1)d. In the analysis of qualitative variables, there was a tendency to cusp fracture in all groups except for Group C. The fiber glass post transfixed horizontally in a MOD cavity significantly increased the fracture resistance of the teeth restored with resin composite.
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