[Clinical evaluation of two tooth preparation methods of metal-porcelain restoration].
OBJECTIVE
To evaluate the clinical performance of the two configurations of gingival margin preparation of tooth.


METHODS
The cases in this study were divided into two groups according to different tooth defects. Each group consisted of 40 cases. One group's gingival margin configuration was 90 degree shoulder, the other was under-gingival non-shoulder. The clinical performance of these restorations was followed up for 1 year and 2 years. The evaluators examined the restorations for plaque index, gingival index, marginal discolor and marginal fit.


RESULTS
There was no significant difference in the evaluators between the two groups.


CONCLUSIONS
The under-gingival non-shoulder margin configuration of porcelain fused to metal should be used for clinical application compared with the 90 degree shoulder one in certain circumstance.
Li
Yu-ling
YL
Dept. of Prosthodontics, School of Stomatology, Guangxi Medical University, Nanning 530021, China.
Wang
Qing-tao
QT
Lan
Li-chong
LC
Lin
Chun-hua
CH
D003776:Dental Porcelain; D017267:Dental Prosthesis Design; D006801:Humans; D016876:Metal Ceramic Alloys; D019231:Tooth Preparation, Prosthodontic / Q000379:methods*
D016876:Metal Ceramic Alloys; D003776:Dental Porcelain