Fracture toughness and flexural strength of dental ceramics for titanium.
Fracture toughness and flexural strength of dental ceramics for titanium.
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DOI：
10.1016/0142-9612(95)91099-k
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发表时间：
1995
期刊：
影响因子：
14
通讯作者：
K. Kvam;T. Dérand;E. Austrheim
中科院分区：
文献类型：
--
作者：
K. Kvam;T. Dérand;E. Austrheim
对用于钛贴面的三种品牌牙科陶瓷：TitanBond（O 'Hara）、Ti-Ceram（Ducera）和Titankeramik（Vita）进行了测试，以比较它们在潮湿和干燥条件下的断裂性能。将每种材料的8个抛光和预裂纹试样在37 °C的水中储存28 d，然后在水下以50 N的恒定载荷在四点弯曲夹具中预加载24 h。其中五个试样在37 °C的水中通过四点弯曲试验断裂。在其余三个试样的三个不同位置测量裂纹深度。断裂载荷和裂纹深度被用来计算断裂韧性。另外10个抛光试件在37 °C水中储存28 d后，用四点弯曲试验测量弯曲强度。使用相同的程序和数量的试样来测量断裂韧性和弯曲强度，而无需预加载和在水中储存。
Three brands of dental ceramics for veneering to titanium: TitanBond (O'Hara), Ti-Ceram (Ducera) and Titankeramik (Vita) were tested to compare their fracture properties in wet and in dry conditions. Eight polished and precracked specimens of each material were stored in water at 37 °C for 28 d and then preloaded in a four-point bending jig with a constant load of 50 N for 24 h under water. Five of the specimens were fractured by a four-point bending test also under water at 37 °C. Crack depths were measured in three different positions in each of the remaining three specimens. Fracture load and crack depths were used to calculate the fracture toughness. Another ten polished specimens were used to measure the flexural strength with a four-point bending test after storage in water at 37 °C for 28 d. Equal procedures and numbers of specimens were used to measure fracture toughness and flexural strength without preloading and storage in water.