Quinn G D, Giuseppetti A A, Hoffman K H
Volpe Research Center, American Dental Association Foundation, Stop 854-6, NIST, Gaithersburg, MD 29899, USA.
Volpe Research Center, American Dental Association Foundation, Stop 854-6, NIST, Gaithersburg, MD 29899, USA.
Dent Mater. 2014 May;30(5):e99-e111. doi: 10.1016/j.dental.2014.02.010. Epub 2014 Mar 29.
The edge chipping test was used to measure the fracture resistance of CAD/CAM dental restoration ceramics and resin composites.
An edge chipping machine was used to evaluate six materials including one feldspathic porcelain, two glass ceramics, a filled resin-composite, a yttria-stabilized zirconia, and a new ceramic-resin composite material. Force versus edge distance data were collected over a broad range of forces and distances. Data were analyzed by several approaches and several chipping resistance parameters were evaluated. The effects of using different indenter types were explored.
The force versus distance trends were usually nonlinear with good fits to a power law equation with exponents usually ranging from 1.2 to 1.9. The order of chipping resistance (from least to greatest) was: feldspathic porcelain and a leucite glass ceramic (which were similar), followed by the lithium disilicate glass ceramic and the two resin composites (which were similar), and finally the zirconia which had the greatest resistance to chipping. Chipping with a Vickers indenter required 28-45% more force than with the sharp conical 120° indenter. The two indenters rank materials approximately the same way. The power law exponents were very similar for the two indenters for a particular material, but the exponents varied with material. The Rockwell C indenter gives different power law trends and rankings.
Despite the variations in the trends and indenters, simple comparisons between materials can be made by chipping with sharp conical 120° or Vickers indenters at 0.50mm. Broad distance ranges are recommended for trend evaluation.
采用边缘崩裂试验来测量计算机辅助设计/计算机辅助制造（CAD/CAM）牙科修复陶瓷和树脂复合材料的抗断裂性。
使用边缘崩裂机评估六种材料，包括一种长石质瓷、两种玻璃陶瓷、一种填充树脂复合材料、一种氧化钇稳定氧化锆以及一种新型陶瓷-树脂复合材料。在广泛的力和距离范围内收集力与边缘距离的数据。通过多种方法对数据进行分析，并评估了几个抗崩裂参数。探讨了使用不同压头类型的影响。
力与距离的趋势通常是非线性的，能很好地拟合幂律方程，指数通常在1.2至1.9之间。抗崩裂性顺序（从最小到最大）为：长石质瓷和一种白榴石玻璃陶瓷（二者相似），其次是二硅酸锂玻璃陶瓷和两种树脂复合材料（二者相似），最后是抗崩裂性最强的氧化锆。使用维氏压头崩裂所需的力比使用尖锐圆锥形120°压头多28 - 45%。两种压头对材料的排序大致相同。对于特定材料，两种压头的幂律指数非常相似，但指数会因材料而异。洛氏C压头给出不同的幂律趋势和排序。
尽管趋势和压头存在差异，但通过使用尖锐圆锥形120°或维氏压头在0.50mm处进行崩裂试验，可以对材料进行简单比较。建议使用较宽的距离范围来评估趋势。
