仮着用ならびに合着用セメントの浮き上がりに関する実験的研究

概要

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Periodontal diseases and arthrosis of temporomandibular joint attributed to inadequate crown or bridge have recently been increasing. To prevent these diseases the functional performance of the prosthesis should be checked by temporarily cementing for some period prior to final fixation. However, very few descriptions were found on the elevation of the crown or even on the film thickness with temporary luting cements for that purpose. In this study, therefore, the elevation of the crown by cementation with temporary and permanent luting cements was examined using experimental crown and abutment tooth models. The space between the crown and abutment was approximately 30μm both at the axial and occlusal plane when the crown was seated on the abutment without cement. The decreasing rate of the elevation of the crown with time under loading was significantly different among the cements, suggesting that the outflow of the cement slurry from the crown margin might be markedly affected by its thixotropical behavior and particle size as well as its consistency. As for the effect of the particle size, it seemed rational to refer the maximum size of the residual particles after setting rather than that of the original powder particles. The temporary luting cements used were devided into two groups showing elevations as small as 4 to 14μm and more than 120μm, respectively. On the other hand, the elevation with the permanent cements ranged from 6 to 47μm. The applied load and load initiation time for cementation affected the elevation. No significant changes were found in the elevation if the load application was started within one minute after the end of mixing. It was also found that the load of 5 kg was sufficient for minimizing the elevation by cementation. The results indicate that in order to check the functional performance of the prosthesis prior to final fixation it is essential to properly select the temporary cement showing compatible elevation with the permanent cement to be used.
九州歯科学会の論文
1988-06-25

著者

脇博泰
九州歯科大学歯科補綴学第2講座

仮着用ならびに合着用セメントの浮き上がりに関する実験的研究

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