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Home Fracture Strength
Fracture strength of copy-milled and conventional In-Ceram crowns
by Hwang JW, Yang JH.;Department of Prosthodontics, College of Dentistry and Dental Research Institute, Seoul National University, 28 Tonkon-Dong Chongro-Gu, Seoul, 110-749, Korea


Department of Prosthodontics, College of Dentistry and Dental Research Institute, Seoul National University, 28 Tonkon-Dong Chongro-Gu, Seoul, 110-749, Korea.
To compare the fracture resistance of copy-milled and conventional In-Ceram crowns, four groups of 10 uniform sized all-ceramic anterior crowns were fabricated: (1) In-Ceram Spinell (2) In-Ceram Alumina (3) Celay In-Ceram Spinell, and (4) Celay In-Ceram Alumina crowns. Using a steel ball at a crosshead speed of 0.5 mm min-1, the crowns were loaded at 30 degrees C angle until catastrophic failure occurred. Mean fracture strength was analysed and compared. The following conclusions were drawn: 1. Celay In-Ceram anterior crowns had a slightly higher fracture strength than conventional In-Ceram crowns. 2. In-Ceram Alumina crowns had a significantly higher fracture strength than In-Ceram Spinell crowns in both conventional and copy milling methods.

"Celay In-Ceram anterior crowns had a slightly higher fracture strength than conventional In-Ceram crowns.�?