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首页> 外文期刊>Operative dentistry >Fracture strength and fracture patterns of root-filled teeth restored with direct resin composite restorations under static and fatigue loading.
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Fracture strength and fracture patterns of root-filled teeth restored with direct resin composite restorations under static and fatigue loading.

机译：用直接树脂复合材料修复物在静态和疲劳载荷下修复了根部充填牙齿的断裂强度和断裂模式。

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摘要

To assess fracture strength and fracture patterns of root-filled teeth with direct resin composite restorations under static and fatigue loading.MOD cavities plus endodontic access were prepared in 48 premolars. Teeth were root filled and divided into three restorative groups, as follows 1) resin composite; 2) glass ionomer cement (GIC) core and resin composite; and 3) open laminate technique with GIC and resin composite. Teeth were loaded in a servohydraulic material test system. Eight samples in each group were subjected to stepped fatigue loading: a preconditioning load of 100 N (5000 cycles) followed by 30,000 cycles each at 200 N and higher loads in 50-N increments until fracture. Noncycled teeth were subjected to a ramped load. Fracture load, number of cycles, and fracture patterns were recorded. Data were analyzed using two-way analysis of variance and Bonferroni tests.Fatigue cycling reduced fracture strength significantly (p<0.001). Teeth restored with a GIC core and a laminate technique were significantly weaker than the composite group (379±56 N, 352±67 N vs 490±78 N, p=0.001). Initial debonding occurred before the tooth underwent fracture. All failures were predominantly adhesive, with subcrestal fracture of the buccal cusp.Resin composite restorations had significantly higher fracture strength than did other restorations. Fatigue cycled teeth failed at lower load than did noncycled teeth.
机译：为了评估在静态和疲劳载荷下具有直接树脂复合材料修复物的牙根充填牙齿的断裂强度和断裂模式。在48个前磨牙中制备了MOD腔和牙髓通道。牙齿被根部填充并分为三个修复组，如下：1）树脂复合材料; 2）玻璃离聚物水泥（GIC）芯和树脂复合材料; 3）采用GIC和树脂复合材料的开放层压技术。将牙齿加载到伺服液压材料测试系统中。每组中的八个样品都经受阶梯式疲劳载荷：100 N的预处理载荷（5000个循环），然后以200 N的载荷每个30,000个循环，并以50 N的增量增加载荷，直到断裂。未循环的牙齿承受了倾斜的负载。记录断裂载荷，循环次数和断裂模式。数据使用方差和Bonferroni检验进行双向分析，疲劳循环显着降低了断裂强度（p <0.001）。用GIC核心和层压技术修复的牙齿明显弱于复合材料组（379±56 N，352±67 N vs 490±78 N，p = 0.001）。最初的脱粘发生在牙齿断裂之前。所有的破坏都以粘合性为主，颊尖部在晶界下破裂。树脂复合修复体的断裂强度明显高于其他修复体。与未循环的牙齿相比，疲劳循环的牙齿在较低的负荷下会失效。

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