Department of Operative Dentistry, Tsurumi University School of Dental Medicine,Yokohama, Japan.
Dent Mater J. 2011;30(3):308-14. doi: 10.4012/dmj.2010-115. Epub 2011 May 20.
The objective of this study was to assess the influence of the ceramic marginal angle on the length and nature of indentation cracks in ceramics near the ceramic/resin bonded interface. Disks of a leucite-reinforced ceramic or a diopside-based glass-ceramic bonded to a resin composite were sectioned so that the ceramic marginal angles were 45, 60, and 90°. Vickers indentations were placed in the ceramic at various distances from the bonded interface. The lengths of the indentation cracks running near parallel to the interface were measured and the orientation of crack propagation was characterized. The crack length and orientation were significantly affected by the distance from the interface and by the marginal angle, respectively. The crack length extended as the distance from the interface was shortened. Smaller marginal angles resulted in more oblique cracks. The toughness of the ceramic affected the indentation crack length, shape, and direction.
本研究旨在评估陶瓷边缘角度对陶瓷/树脂结合界面附近陶瓷内压痕裂纹长度和性质的影响。将具有白榴石增强陶瓷或透辉石基玻璃陶瓷的圆盘与树脂复合材料结合，以使陶瓷边缘角度分别为 45°、60°和 90°。在陶瓷中以不同距离于结合界面进行维氏压痕。测量与界面平行的近压痕裂纹的长度，并对裂纹扩展方向进行特征描述。裂纹长度和方向分别受距界面距离和边缘角度的显著影响。随着与界面距离的缩短，裂纹长度延伸。较小的边缘角度导致更倾斜的裂纹。陶瓷的韧性影响压痕裂纹的长度、形状和方向。
