1996 Volume 40 Issue 1 Pages 77-82
The effects of resin-bonded bridge design parameters (adhesive area, shape and metal frame thickness) on the bonding strength of the resin-bonded bridge were investigated by using the adhesion test when the resin-bonded bridge of the upper anteriors was designed as a prerequisite. The adhesion test was performed using a universal testing machine to test the bond strength and toughness of specimensmade with a metal frame bonded to an abutment metal mold.
The results were as follows:
1. Maximum bonding force (bf) increased as the metal frame thickness (tm) increased. The values of the maximum bonding force were 10-13 kgf for tm 0.5 mm, 34-46 kgf for tm 1.0 mm, and 68-84 kgf for tm=1.5 mm.
2. Maximum bonding strength, in which bf was divided by the adhesive area, increased as the adhesive area increased.
3. The durability of the resin-bonded bridge was discussed by comparing the toughness. The toughness increased as the metal frame thickness (tm) increased. The values of toughness were 4-13 kgf · mm for tm= 0.5 mm, 10-31 kgf · mm for tm= 1.0 mm, and 20-44 kgf · mm for tm =1.5mm.
4. In order to increase the durability of the resin-bonded bridge, the proposed design conditions were the metal frame thickness (tm) should be as large as possible and the large adhesive area and/or additional groove and wing form among the design parameters should be especially effective.
