[Double scanning method for computer aided design and computer aided manufacture all-ceramic restorations].
OBJECTIVE
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.


METHODS
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.


RESULTS
The observation time for the crowns ranged from 6 to 24 months. The results of clinic evaluation were acceptable in all restorations.


CONCLUSIONS
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.
Liu
Yi-Hong
YH
Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Feng
Hai-Lan
HL
Wang
Hai-Tao
HT
Wang
Lin
L
Nie
Yu-Guang
YG
Wang
Tao
T
D000328:Adult; D000368:Aged; D017076:Computer-Aided Design; D003442:Crowns; D003776:Dental Porcelain; D017267:Dental Prosthesis Design; D019554:Dental Restoration Wear; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010783:Photometry; D013499:Surface Properties; D015040:Zirconium
D003776:Dental Porcelain; D015040:Zirconium; C028541:zirconium oxide