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牙本质粘接强度剪切测试法因方法简便而被广泛使用。测试中出现牙本质内聚破坏被认为系粘接强度大于内聚强度,并有解释原因为牙本质内聚强度降低。但研究发现粘接界面处应力分布不均。故本文提出:牙本质内聚破坏不仅有牙本质强度降低,而且与剪切测试方法本身的力学特点有关。 采用破坏累积模型计算动态应力分布下的破坏过程。对常规的粘接强度剪切测试法建立二维有限元模型:牙本质试件5.6mm×2mm,树脂为长2mm、直径4mm圆柱试件;粘接面为直径3mm圆形,厚度分别
Dentin bonding strength shear test method is simple and widely used. Tensile dentin cohesion was observed in the test is greater than the cohesive strength of the cohesive strength, and explain the reason for the decrease in dentin cohesive strength. However, the study found that the adhesive interface at the uneven distribution of stress. Therefore, this paper proposes: Dentin cohesion failure not only reduce the dentin strength, but also with the mechanical properties of the shear test itself. The failure model is used to calculate the failure process under dynamic stress distribution. A two-dimensional finite element model was established for the conventional shear strength test of adhesive strength: dentin specimen 5.6 mm × 2 mm, resin length 2 mm and diameter 4 mm cylindrical specimen; the bonding surface was 3 mm in diameter and the thickness was