Liu Yi-Hong, Feng Hai-Lan, Wang Hai-Tao, Wang Lin, Nie Yu-Guang, Wang Tao
Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Zhonghua Kou Qiang Yi Xue Za Zhi. 2010 Mar;45(3):168-71.
To introduce the double scanning for producing computer aided design and computer aided manufacture (CAD-CAM) zirconia crowns, and to compare Procera with Everest CAD-CAM system by observing clinical effects of the crowns.
Forty CAD-CAM zirconia crowns (10 crowns by Procera, and 30 crowns by Everest) were evaluated, and the examination criteria included: marginal fit, aesthetics, gingival health, retention, and fracture. All of the zirconia copings were produced using double scanning. Procera system and Everest system use contact scanner and optical scanner respectively.
The observation time for the crowns ranged from 6 to 24 months. The results of clinic evaluation were acceptable in all restorations.
Double scanning could be used to produce complicated zirconia copings by CAD-CAM in order to get proper symmetrical porcelain length. It was easier to make complicated coping with contact scanner than with optical scanner.
介绍用于制作计算机辅助设计与计算机辅助制造（CAD-CAM）氧化锆全冠的双重扫描技术，并通过观察全冠的临床效果来比较Procera系统与Everest CAD-CAM系统。
对40个CAD-CAM氧化锆全冠（10个由Procera系统制作，30个由Everest系统制作）进行评估，评估标准包括：边缘适合性、美观性、牙龈健康状况、固位力和折裂情况。所有氧化锆基底冠均采用双重扫描制作。Procera系统和Everest系统分别使用接触式扫描仪和光学扫描仪。
全冠的观察时间为6至24个月。所有修复体的临床评估结果均可接受。
双重扫描可用于通过CAD-CAM制作复杂的氧化锆基底冠，以获得合适的对称瓷层厚度。使用接触式扫描仪比光学扫描仪更容易制作复杂的基底冠。
