試作FRPを応用した支台築造に関する研究
スポンサーリンク
概要
- 論文の詳細を見る
Traditionally, in case of abutment build up, casting metal core or resin core combination with ready-made metal post were used. However, it is pointed out that stress concentration is created at the tip of metal post because of the difference in the modulus of elasticity between the metal and the tooth, and that can cause root fracture. In recent years, abutment build up using fiber reinforced plastic (FRP) is noticed, since FRP has similar modulus of elasticity to human tooth. The purpose of this study is to pursue the appropriate abutment build up using core resin combination with the FRP. For this experiment, prototype FRP, five kinds of core resins and human extracted teeth were used. The shear bond strength of the each core resin to the prototype FRP was examined before and after thermo cycling by compression shear bonding test. Next, the pulling-out strength of the prototype FRP using each core resins to the root canal of human teeth was examined before and after thermo cycling. Moreover, the fractured surfaces of specimens after pulling-out test were observed. The results were as follows : 1. The shear bond strength of the light polymerizing-type resins and the dual poly merizing-type resins to prototype FRP were higher than that of the chemical polymerizing type-resins, and decreased little by thermo cycling. 2. In the experiment using human extracted teeth, the pulling-out strength of prototype FRP using the dual polymerizing-type resins were higher than that using the chemical polymerizing-type resins. 3. When specimens after pulling-out test were observed, in the dual polymerizing-type resins complex failures were often observed, while in the chemical polymerizing-type resins interface failures between resin and dentin were observed with high frequency. From the mentioned above, it is suggested that the dual polymerizing-type resins are suitable for the abutment build up using this prototype FRP combination with core resin.
- 2005-09-30