Seghi R R, Sorensen J A
Department of Restorative and Prosthetic Dentistry, The Ohio State University, Columbus 43210, USA.
Int J Prosthodont. 1995 May-Jun;8(3):239-46.
The flexural strength of six recently introduced dental ceramic materials was measured using a three-point-bend test. Conventional feldspathic porcelain and soda-lime glass were used as controls. All six of the new materials had significantly greater breaking strength than the controls. The alumina-based crystalline-reinforced materials exhibited the highest breaking strengths. The silica-based crystalline-reinforced materials resulted in ceramic materials with more moderate strength but still with significantly greater strength than the controls. Scanning electron microscopic analysis of the fractured surfaces indicated crack deflection appeared to be the principal strengthening mechanism in the highly crystalline materials.
使用三点弯曲试验测量了六种新推出的牙科陶瓷材料的抗弯强度。传统长石质瓷和钠钙玻璃用作对照。所有六种新材料的断裂强度均显著高于对照材料。氧化铝基晶体增强材料的断裂强度最高。硅基晶体增强材料制成的陶瓷材料强度适中，但仍显著高于对照材料。对断裂表面的扫描电子显微镜分析表明，裂纹偏转似乎是高结晶材料中的主要强化机制。
