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Fracture strength of copy‐milled and conventional In‐Ceram crowns
Author(s) -
Hwang JungWon,
Yang JaeHo
Publication year - 2001
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1046/j.1365-2842.2001.00731.x
Subject(s) - materials science , crosshead , composite material , fracture (geology) , flexural strength , universal testing machine , ultimate tensile strength
The purpose of this study was 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 for this test: (1) In‐Ceram Spinell (2) In‐Ceram Alumina (3) Celay In‐Ceram Spinell, and (4) Celay In‐Ceram Alumina crowns. All specimens were cemented on stainless steel master die with resin cement and stored in 37 °C water for one day prior to loading into a universal testing machine. Using a steel ball at a crosshead speed of 0·5 mm min −1 , the crowns were loaded at 30 °C angle until catastrophic failure occurred. Mean fracture strength was analysed and compared. Under the conditions of this study and the materials used, the following conclusions were drawn: 1. The strength of 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.