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1.
Fogorv Sz ; 92(7): 203-12, 1999 Jul.
Article in Hungarian | MEDLINE | ID: mdl-10489730

ABSTRACT

An experimental model was constructed to test the abutment screw fixation for two Hungarian implant systems. First, abutments were tightened to 22.4 Ncm and after 4.25 hour loosening torques varied between 13.8-20.9 Ncm. Secondly, premolar-form crowns were casted and cemented on abutment-implant assemblies and cyclic load between 20-60 N was applied. 3.8-18.3 Ncm of loosening torques were measured. Four abutments of nine test assemblies were completely loosened and the cement fixation of one crown was destroyed. It was concluded that the test procedure and the model of crown-abutment-implant assemblies had given a reproducible technique to record changes in torques during a dynamic load.


Subject(s)
Dental Abutments , Dental Implantation , Dental Implants/standards , Bicuspid , Crowns , Humans , In Vitro Techniques
2.
Fogorv Sz ; 85(10): 299-307, 1992 Oct.
Article in Hungarian | MEDLINE | ID: mdl-1303875

ABSTRACT

Diakor aluminium oxide implants of different forms and sizes have been investigated and compared by photoelastic stress analysis. On forming the conditions of investigations the authors aimed at the modelization based upon the physiological direct implant-bone contact, installing implants having resin that is optically double refractive. In the sample results show a move advantageous stress relation at multi grooved implants of extended dimensions.


Subject(s)
Dental Implantation/standards , Dental Stress Analysis/methods , Aluminum Oxide/standards , Biomechanical Phenomena , Elasticity , Humans , Metal Ceramic Alloys
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