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[The experimental study of the relationship between preparation height and retention of complete crowns]
Li-Ping Chen1, Nan Hua, Yan Ge
1Department of Prosthodontics, Ninth People's Hospital, School of Stomatology, Shanghai Second Medical University, Shanghai 200011, China.
Purpose:
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.
Conclusion:
In order to get enough retention of short height molar, we should induce the preparation taper.