Zimmermann Moritz, Egli Gustav, Zaruba Markus, Mehl Albert
Department of Computerized Restorative Dentistry, Center of Dental Medicine, University of Zurich.
Dent Mater J. 2017 Nov 29;36(6):778-783. doi: 10.4012/dmj.2016-296. Epub 2017 Aug 24.
The fracture behavior of CAD/CAM fabricated crowns was investigated as a function of material thickness for six silicate ceramic materials: Mark II, e.max CAD, Celtra Duo milled, Celtra Duo fired, Suprinity, Enamic. Crowns with thicknesses 0.5/1.0/1.5 mm were fabricated with CEREC and adhesively seated to dies fabricated with stereolithography technology (n=144). Thermomechanical loading and fractural loading was performed. Statistical analysis was done with one-way ANOVA and post-hoc Scheffé test. For 1.5 mm, all crowns survived fatigue testing, for 1.0 mm, survival was 100% only for materials e.max CAD and Suprinity. For 0.5 mm, best survival rate was 37.5% for Suprinity. Maximum fractural loading significantly varied among the groups. For 0.5 mm, highest value was found for Suprinity (660.1 N). Mark II showed lowest values for 1.0 mm (482.0 N), and 1.5 mm groups (634.8 N). e.max CAD showed highest values for 1.0 mm (774.2 N), and 1.5 mm groups (1,240.8 N).
研究了六种硅酸盐陶瓷材料（Mark II、e.max CAD、Celtra Duo铣削、Celtra Duo烧制、Suprinity、Enamic）制成的CAD/CAM全冠的断裂行为与材料厚度的关系。使用CEREC制作厚度为0.5/1.0/1.5毫米的全冠，并通过粘接固定在采用立体光刻技术制作的代型上（n = 144）。进行了热机械加载和断裂加载。采用单因素方差分析和事后Scheffé检验进行统计分析。对于1.5毫米厚的全冠，所有全冠在疲劳测试中均存活；对于1.0毫米厚的全冠，仅e.max CAD和Suprinity材料的存活率为100%。对于0.5毫米厚的全冠，Suprinity的最佳存活率为37.5%。各组之间的最大断裂载荷有显著差异。对于0.5毫米厚的全冠，Suprinity的最大值最高（660.1 N）。Mark II在1.0毫米厚（482.0 N）和1.5毫米厚组（634.8 N）中显示出最低值。e.max CAD在1.0毫米厚（774.2 N）和1.5毫米厚组（1240.8 N）中显示出最高值。
