[The experimental study of the relationship between preparation height and retention of complete crowns].
OBJECTIVE
This study was to discuss the influence of preparation height on retention of complete crown.


METHODS
In this study we measured the retention of complete crown with the preparation height 2 mm, 3 mm, 4 mm and 5 mm. All crowns had no preparation taper and no bonding agent was used. The retention of crowns was measured and the data was statistically analyzed by t test.


RESULTS
The preparation height was directly proportional to the retention of complete crown. And the crown with the height of 2 mm had enough retention when the crown had no preparation taper.


CONCLUSIONS
In order to get enough retention of short height molar, we should induce the preparation taper.
Chen
Li-Ping
LP
Department of Prosthodontics, Ninth People's Hospital, School of Stomatology, Shanghai Second Medical University, Shanghai 200011, China.
Hua
Nan
N
Ge
Yan
Y
Zhuang
Jing
J
Qian
Qiong
Q
D003442:Crowns; D017268:Dental Prosthesis Retention; D003799:Dental Stress Analysis; D006801:Humans; D019231:Tooth Preparation, Prosthodontic