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KMID : 0362419970350020417
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Journal of Korean Academy of Prosthodontics
1997 Volume.35 No. 2 p.417 ~ p.430
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A STUDY ON FRACTURE STRENGTH OF CONVENTIONAL AND COPY-MILLED IN-CERAM CROWNS
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Hwang Jung-Won
Yang Jae-Ho
Lee Sun-Hyung
Chung Hun-Young
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Abstract
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The purpose of this study was to compare the fracture resistance of copy-milled and conventional In-Ceram crown. Four groups of ten uniform sized all-ceramic crowns were fabricated. In-Ceram Spinell and In-Ceram Alumina crowns were fabricated as control group, Celay In-Ceram Spinell and Celay In-Ceram Alumina crowns were fabricated as test group. All specimen were cemented on stainless steel master die with resin cement, and stored in 37degrees C water for 1 day prior to loading in Instron testing machine. Using a steel ball at a crosshead speed of 0.5mm/min, the crowns were loaded at 30degree angle until catastrophic failure occurred. The results obtained were as follows : 1. With the value of 984.8N+/-103.67N, the strength of Celay In-Ceram Alumina crowns had a significantly higher fracture strength than conventional In-Ceram Alumina crowns(876.2N+/-92.20N) (P<0.05). 2. The fracture strength of Celay In-Ceram Spinell crowns(706.3+/-70.59N) was greater than that of conventional In-Ceram Spinell crowns(687.4+/-90.26N), but there was no significant difference(P>0.05). 3. The In-Ceram Alumina crowns had a significantly higher fracture strength than In-Ceram Spinell crowns in both methods(P<0.05). 4. Ther order of fracture strength was as followed :Celay In-Ceram Alumina, In-Ceram Alumina, Celay In-Ceram Spinell and In-Ceram Spinell crowns
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KEYWORD
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In-Ceram, Celay, copy-milling, alumina, spinel, fracture strength
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