1999 年 18 巻 4 号 p. 462-466
A small experimental impression tray was fabricated with a NiTi shape memory alloy plate After recovery of the shape memory effect, the upper rims of the tray holding the impression were opened to some extent, the resistance during removal of the model from the impression was significantly decreased compared to a commercially available tray and the tray before recovery of the shape memory effect. The pull-out force of the model from the impression was 23.5(0.2)N for the commercially available tray, 23.5(3.9)N for the experimental tray before recovery of the shape memory effect and 14.7(4.0)N after recovery of the shape memory effect (heated for 15min at 70°C). Therefore the tray should be useful in teeth fracture free modeling.
