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[A dynamic functional comparative analysis of screw retained vs cement retained crowns under cyclic fatigue testing]
1Department of Prosthodontics, College of Stomatology, Wuhan University, Wuhan 430079, China.
Objective:
To investigate the stability and mechanical characteristics of screw-retained and cement-retained crowns under dynamic cyclic fatigue testing.
Methods:
Screw-retained and cement-retained crown samples were fixed on a 227 kg pressure transducer, through computer control cyclic fatigue testing was performed under a load of 15 kg on the sample during testing. Crown mobility was assessed in PTV value and the failure pattern of crowns were recorded.
Results:
The initial PTV of cement-retained and screw-retained samples were not significant difference. The stability of the two group samples was no significant difference after testing. However the pattern of failure in two group samples was different.
Conclusion:
Both screw-retained and cement-retained methods may provide sufficient retentive force to keep stability of the crown in masticatory function.