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KMID : 0362419900280010203
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Journal of Korean Academy of Prosthodontics
1990 Volume.28 No. 1 p.203 ~ p.216
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An experimental study on the cervical margin fitness in the collarless metal ceramic crowns formed by different techniques
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Lee Jae-Hyeuk
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Abstract
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The purpose of this study was to evaluate the cervical margin fitness in the collarless metal ceramic crowns formed by different techniques. Specmens were divided as follows ; the metal ceramic crwn with metal butt margin as group I the collarless metal ceramic crwns formed with resin binder technque as group II, and the collarless metal ceramic crowns formed with shoulder powder mixed with phosphate-bonded investment liquids on a refractory die as group III. Each group was made of five specmens, and their marginal fitness on each epoxy die was evaluated under scanning electon microscope of ×200 magnification at three measuring points: mesial, central, distal. The following results were obtained. 1. The metal ceramic crowns with metal butt margin exhibited significantly better marginal fitness than the collarless metal ceramic crwons. The marginal fitness in descending order was group I, III, II. 2. The collarless metal ceramic crown formed with resin binder technique had the worst marginal fitness & showed cervical color variation and dermacation between the corrected porcelain & the dentin porcelain. 3. The collarless metal ceramic crowns formed with shoulder powder mixed with phosphate-bonded investment liquids on a refractory die exhibited significantly better marginal fitness & sharper marginal configuration than the other collarless group.
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