摘要
目的比较IPS e.max press热压铸全瓷冠、Cercon计算机辅助设计制作的全瓷冠的边缘适合性.方法取正畸拔除的上颌双尖牙1颗,制备全瓷冠的牙体模型,复制30个树脂代型,其中15个用于分别制作IPS e.max press、Cercon全瓷冠,对照组钴铬烤瓷冠(n=5),15个体视显微镜下观察、评价全冠边缘适合性,实验数据用进行单因素方差分析.结果 3组试件完全边缘缝隙的平均值(66.65±28.07)μm,IPS e.max press组(58.03±22.90)μm,Cercon组(90.23±24.13)μm,钴铬烤瓷组(51.68±23.02)μm,Cercon组的边缘缝隙最大,与其它2组差异有统计学意义(P<0.01).IPS e.max press组与钴铬烤瓷组完全边缘缝隙比较差异无统计学意义(P>0.05).结论 IPS e.max press热压铸全瓷冠和Cercon全瓷冠的边缘适合性均在临床可接受的范围,IPS e.max press全瓷冠边缘适合性优于Cercon全瓷冠,与钴铬烤瓷冠组边缘适合性比较差异无统计学意义(P>0.05).
Objective To evaluate the marginal fit of two all-ceramic crown systems with the metal-ceramic crown as the control group.Methods An extracted maxillofacial premolar was prepared for a full crown and 30 resin casts were subsequently duplicated.All-Ceramic crown(n=5) was fabricated on the resin casts using IPS e.max press and Cercon Y-TZP(yttriumcation-doped tetragonal zirconia polycrystals) with the metal ceramic crown as a comparison.The absolute marginal discrepancy(AMD) of the full crown was assessed by stereomicroscopy.The data were analyzed using 1-way ANOVA(α=0.05).Results The means of AMD were 58.03±22.90 μm for the IPS e.max press group,90.23±24.13 μm for the Cercon group and 51.68±23.02 μm for the control group.There was a statistically significant difference between the Cercon group and the other two groups(P<0.01) but no significant difference was found between IPS e.max press group and the control group.Conclusion Within the limitation of this in vitro study,the marginal fit of all-ceramic crown systems is acceptable in clinical practices.The marginal fit of IPS e.max press is better than Cercon system(P<0.01),but no significant difference is found statistically between IPS e.max press group and the control group.
出处
《昆明医科大学学报》
CAS
2013年第7期47-49,共3页
Journal of Kunming Medical University
基金
云南省教育厅科研基金资助项目(08Y0230)
