THE EFFECTS OF THERMAL CYCLING ON THE BOND STRENGTH OF SELF-CURING RESIN

Thermal Cycling에 따른 자가중합 레진의 결합강도에 관한 연구

  • Cho, Hye-Won (Dept. of Prosthodontics, Dental College, Wonkwang University) ;
  • Ha, Jum-In (Dept. of Prosthodontics, Dental College, Wonkwang University)
  • 조혜원 (원광대학교 치과대학 치과보철학교실) ;
  • 하점임 (원광대학교 치과대학 치과보철학교실)
  • Published : 1997.12.01

Abstract

The purpose of this study was to evaluate the effects of two metal adhesive primers on the shear bond strengths of self-curing resin to Ni-Cr a]toy and the effects of 1000 thermal cycling on the durability of the bond. The two selected metal adhesive primers were Metal Primer II(G-C corp., Japan) and MR Bond(Tokuyama corp., Japan) and no treatment groups were used as control. All specimens were divided into two groups according to thermal cycling. In the group without thermal cycling, the specimens were stored in water for 24 hours. In the group with thermal cycling, the specimens were thermocycled 1000 times at temperature of $5^{\circ}C\;and\;55^{\circ}C$. Shear bond strengths were measured using the Universal testing machine(Zwick 145641, Germany) with a crosshead speed of 0.5 mm/min. The results were as follows: 1. MR Bond significantly improved the shear bond strength of resin to Ni-Cr alloy before and after thermal cycling. 2. There were no difference in the shear bond strength of resin to Ni-Cr alloy between Metal Primer II treated group and no treatment group. 3. Regardless of the type and the use of adhesive primers, there were tendency of decrease in shear bond strength with 1000 thermal cycling.

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