抄録
This investigation was made to clarify the factors which had influences upon adhesive strength of the adhesion bridge to the enamel in the clinical conditions. Tension and shear force were applied onto the specimens for measuring the adhesion strength under the various conditions. The results obtained in this study were summarized as follows: 1) Film thickness of the resin and loading of 100 kg repeatedly on the adhesive resin effected onto the adhesive strength of the resin to enamel and Co-Cr dental alloy. The degree of influences varied, depending on the physical properties of the adhesive resin. 2) Even a slight movility in one abutment tooth decreased remarkably the retentive strength of the adhesion bridge. On the contrary, the movility of both abutment teeth increased it slightly. 3) The rotation force produced by applying load to the bucco-lingual direction decreased remarkably the retentive strength of the adhesion bridge compared with the vertical force.
