不同包埋方法对铸件边缘适合性影响的实验研究

Experimental Study of the Effect on Marginal Seating of the Castings by Different Investing Methods

目的 观察无圈包埋和有圈包埋对铸件边缘适合性的影响。方法 制作模拟后牙全冠外形的标准试件及圆管 ,于试件上制作 12个蜡型 ,并随机分为 2组 ,每组 6个蜡型。对同一种包埋料 ,采用两种包埋方法 ,即无圈包埋和有圈包埋 ,包埋模拟铸件后牙冠的帽状蜡型 ,铸造后铸件试合于原帽状试件 ,在体视显微镜下分别测试铸件的边缘适合性。结果 无圈包埋组铸件的边缘适合性与有圈包埋组相比有显著性差异 (P <0 .0 5 )。

Objective The purpose of this study was to observe the effect on marginal seating of the castings with and without ring investments.Methods Standarded as cast specimens and round capsules simulated post tooth crowns were made. 12 wax pattern were prepared on the as cast specimens. The 12 specimens were divided into two groups with 6 wax pattern in each group. Two different investing methods with the same investing material were tested. The marginal seating of the castings was measured under traveling microscope.Results The marginal seating of the casting without ring investment had significant difference compared with the castings with ring investment ( P <0.05).Conclusion Casting without ring can improve the marginal seating of the castings.