摘要
目的:通过测定不同龈高度牙体模型上全冠的固位力,探讨后牙全冠修复获得理想固位的合适牙体高度。方法:制作底部直径7mm,轴聚角5°,高度分别为1mm、2mm、3mm、4mm、5mm、6mm的离体牙模型6组,每组6个。用滴蜡法在每个模型上制作金属全冠,全冠用磷酸锌水门汀粘固,应用万能电子拉力实验机进行冠固位力测定。结果:轴聚角5°,龈高度为1、2、3、4、5、6mm的各组平均冠固位力分别为84.25N、116.67N、183.00N、268.58N、360.92N、448.25N。不同高度的牙体冠固位力之间有显著差异。结论:全冠固位力与龈高度成正比,当内聚角为5°,冠高度小于3mm时,冠固位力不能满足临床需要。
Objective： The retention of complete crown was measured with different height to probe into the ideal preparation height of molar.MethodtThe 36 extracted molar was produced with 5°crown taper and 7ram diameter.6 groups were divided with the different height： 1 mm,2 mm,3 mm,4 ram,5 mm,6 mm, and each group had 6 teeth.Crowns were made on each model.Each group was measured about the retention of crowns by Autograph Force Meter. Result： The retention of crowns on the models with 5° crown taper and 1 mm,2 mm,3 mm,4 mm,5 mm,6 mm height were 84.2500 N, 116.6667 N,183.0000 N,268.5833 N,360.9167 N,448.2500 N respectively.The retention of Crowns between models increased significantly with the increase of crown height.Conclusion. The retention of complete Crown was relevant to the crown height.When the preparation taper was 5° and the preparation height was more than 2 mm, The retention of complete crown increased obviously.
出处
《临床口腔医学杂志》
2007年第7期427-428,共2页
Journal of Clinical Stomatology
关键词
固位力
[牙合]龈高度
全冠
Retention
Preparation height
Complete Crown
