摘要
目的研究高透性氧化锆陶瓷及IPS EmpressⅡ玻璃陶瓷材料的底层厚度与透光度的变化规律,为临床上从美学因素选择及制作全瓷底层材料提供参考依据。方法将两种高透性氧化锆陶瓷分别制作成边长12 mm,厚度分别为0.4 mm、0.6 mm、0.8 mm、1.0 mm的正方形瓷片,每种各5个。将玻璃陶瓷块制作成边长12 mm,厚度分别为0.6 mm,0.8 mm,1.0mm,1.2 mm的正方形瓷片,每种各5个。抛光后用分光光度计测量各试样相对透明度。结果 3种全瓷底层材料的相对透明度随着厚度的增加而减小,高透性氧化锆全瓷底层材料厚度为0.4 mm时,相对透明度最好,且与同种材料的其它组有显著差异(P<0.05);在相同厚度下,3种全瓷底层材料的相对透明度没有显著差异(P>0.05)。结论全瓷底层材料的透光性随着底瓷厚度的增加而减小;透明性氧化锆全瓷底层材料在厚度为0.4 mm时透光性最好,在厚度0.6～1.0 mm范围内透光性与IPS EmpressⅡ玻璃陶瓷材料的透光性相似。
Objective To study the law of basal thickness and translucency of two brands of translucent zirconia ceramics and IPS Empress Ⅱ glass-ceremic so as to provide clinical reference for chosing and fabricating all-ceremic basal material aesthetically.Methods Four groups of square-shaped specimens（12 mm in length and 0.4,0.6,0.8,or 1.0 mm in thickness） made of two kinds of translucent zirconia ceramics separately and another four groups of square-shaped Empress Ⅱ glass-ceramic specimens（12 mm in length and 0.6,0.8,1.0,or 1.2 mm in thickness） were fabricated,five disks per group.The relative translucency of each specimen was measured with a spectrophotometer after polishing.Results Increasing the thickness resulted in decrease of relative translucency.When the thickness of zirconia ceramic core materials was 0.4 mm,the relative translucency was the best,which showed significant difference with other groups in the same material（P＆lt;0.05）.There were no significant differences in the relative translucency among three all-ceramic core materials in the same thickness（P＆gt;0.05）.Conclusions The translucency of all-ceramic core materials decreases along with the increase of thickness.The translucency of zirconia ceramic core materials is best in the thickness of 0.4 mm,and the translucency of zirconia ceramic core materials in the thickness within 0.6~1.0 mm is similar to that of Empress Ⅱ ceramic glass-ceramic material.
出处
《口腔医学》
CAS
2013年第5期324-326,共3页
Stomatology
基金
江苏高校优势学科建设工程资助项目
关键词
牙科陶瓷
底层材料
厚度
相对透明度
dental ceramics
core material
thickness
relative translucency
