Abstract
Fracture repair of resin base denture by shape recovery of shape memory alloy (SMA) was studied. The effectiveness of repair was estimated by changes of tensile strength and specimen dimension of SMA fiber reinforced denture base resin matrix composite before and after repair. Repaired at low temperature, the tensile strength did not decrease, but at high temperature it decreased. This decrease was possibly caused by the decrease of bonding strength between the repair resin and denture base resin. After repair at high temperature, the specimen reinforced by parent (austenite) phase fiber showed nearly no change, but that reinforced by stress induced martensite phase fibers howed shrinkage. We speculated that the shrinkage was caused by the increase of denture base resin compressive stress with fiber shrinkage and by softening of the denture base resin. The optimization of fiberproperties and repair temperature suggested that repair without change of strength and dimension is possible.
