摘要
目的评估两种计算机辅助设计(CAD)/计算机辅助制造(CAM)系统制作的氧化锆内冠在种植体基台上的边缘和内部适合性。方法采用不同扫描方式在同一个种植体基台上制备Procera和Lava氧化锆内冠各5颗,与传统方法制作的5颗贵金属内冠进行比较。用超硬石膏复制15个基台,随机与两种氧化锆内冠和贵金属内冠黏结、切割、包埋。采用扫描电镜(SEM)评估内冠的边缘、肩台、牙合面以及轴面适合性。结果 3种内冠间的边缘和轴面适合性差异无统计学意义(P>0.05)。Lava内冠牙合面适合性明显优于Procera内冠(P<0.05)和贵金属内冠(P<0.05),而Procera内冠又明显优于贵金属内冠(P<0.05)。结论两种氧化锆内冠的边缘和内部适合性均在临床可接受范围内,不同制作技术对氧化锆内冠的内部适合性具有一定影响。
Objective To evaluate the accuracy of marginal and internal fit of the zirconium copings manufactured by two different computer-aided design （CAD） /computer-aided manufacturing （CAM） system on the implant abutment. Methods Using different scanning mode, five ProceraR zirconium copings and five Lava zirconium copings were fabricated on the same implant abutment, and then compared with five precious metal copings fabricated by traditional method. Fifteen abutment replica were made with die-stone and the cop- ings were randomly cemented on them, then they were sectioned and invested. The marginal, shoulder, ocelu- sal, and axial fit of each sample was measured by scanning electron microscopy （SEM）. Results There was no significant difference in marginal and axial fit among the three groups （ P 〉 0.05 ）. Significant difference in occlusal fit was found among the three groups （P 〈 0.05 ） ： Lava group showed better fit than the others （ P 〈 0.05 ） and Procera~ group showed better fit than the control （ P 〈 0.05 ）. Conclusions These two types of zirconium coping have clinically acceptable marginal and internal fit. The internal fit of zirconium coping may be affected by different manufacturing techniques.
出处
《中国医学科学院学报》
CAS
CSCD
北大核心
2012年第3期249-253,共5页
Acta Academiae Medicinae Sinicae
