The Experimental Study Of The Relationship Between Low Molar And The Retention Of Complete Crown

ObjectiveTo probe into the minimum preparation height of low molar by measured with theretention of complete crown．MethodsProduced with1.0,1.5,2.0and2.5mm crown height and0°taper as the modelgroup,4.0mm crown height and6°taper as the control group. Each group wasmeasured by Autograph Force Meter,the data was analyzed in Dunnett-t test．ResultsBefore cementation,the model group were (11.38±2.55) N、(19.20±2.52) N、(30.60±4.17) N、(48.41±3.65) N;after cementation, they were (109.20±21.76) N、(195.52±28.32) N、(263.55±44.53) N、(357.90±19.85) N.the control group were(28.89±4.17) N and (303.33±27.81) N．To compared with the control group,the1.0,1.5, and2.5mm group has significant difference(p<0.05),the2mm group hasno significant difference(p>0.05).ConclusionsWhen the preparation height was lower than2mm and even if the taper was0°,the retention of complete crown decreased obviously．...