2004 Volume 24 Issue 1 Pages 1-10
The castable glass ceramic, CASMIC, containing apatite [Ca10 (PO4) 6 (O, F2)] and magnesium titanate [MgTiO3] was focused as an aesthetic tooth-colored restorative material.The fitness between CASMIC inlays and the three different inlay cavities, Convex (CV), Semi-concave (SC), and Concave (CC), was investigated comparatively. The endurance of CASMIC inlays and cavity forms after insertion were also investigated. In the fitness test, the mean values of gaps on the bucco-lingual and mesio-distal section were obtained. In the endurance test, luted samples were repeatedly loaded to measure the number of repeated loading until fracturing.
In the fitness test, CC showed the smallest mean gap on bucco-lingual section, followed by SC and then by CV. Although a significant difference (p<0.05) was not observed, SC showed the smallest value at cavity margins, and CC and then CV followed. On mesio-distal section, SC showed the smallest value, followed by CC and CV. In the repeated-load test, CV showed a tendency to fracture, and CC tended to remove and fracture, whereas SC was neither fractured nor removed despite being deformed.
These results suggest that the SC cavity is the most suitable cavity form upon CASMIC inlay restoration.
