The experimental study of the relationship between low molars and the retaining force of complete crownChinese Full Text
ZHOU Guan-hua,XIAO Yue-hong,LI Wu-wei.(Department of Prosthodontics,Liaoning University,Jinzhou 121001,China)
Abstract: Objective To probe into the minimum preparation height of low molars by examining the retaining force of complete crown.Methods Produce the experimental group in 1.0,1.5,2.0 and 2.5 mm crown height and 0° taper,and the control group in 4.0 mm crowns height and 6° taper.Each group was measured with Autograph Force Meter,and the data were analyzed with Dunnett-t test.Results Before cementation,the retaining force of the experimental group was（11.38±2.55）N,（19.20±2.52）N,（30.60±4.17）N,（48.41±3.65）N;after cementation,the retaining force of the experimental group was（109.20±21.76）N,（195.52±28.32）N,（263.55±44.53）N,（357.90±19.85）N.The retaining force of the control group before cementation was（28.89±4.17）N and the retaining force of the control group after cementation was（303.33±27.81）N.Compared with 4.0 mm crowns in the control group,the 1.0,1.5,and 2.5 mm crowns in the experimental group had significant difference（P＜0.05）,while the 2 mm crowns had no significant difference（P＞0.05）.Conclusions When the preparation height was lower than 2 mm,even if the taper was 0°,the retaining force of complete crown decreased obviously.
- DOI：
10.13591/j.cnki.kqyx.2012.07.006
- Series：
- Subject：
- Classification Code：
R783.3
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