Dimensional Accuracy of All-ceramic Crowns

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  • オールセラミックス・クラウンの適合精度

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Abstract

This study evaluated the dimensional accuracy of all-ceramic crowns which were accomplished directly on the duplicating refractory die. Four commercial porcelains were evaluated. Each material was fabricated according to the manufacturer's instructions. Thereafter, the dimensional accuracy of duplicating refractory die and crown were measured, and the crown distortion was tested with low-viscosity elastomer (fit-checker and bite-checker). Thermal expansion were measured in both duplicating refractory die and porcelain. The boundary area between porcelain and duplicating refractory die was also analyzed with electron probe micro analyser (EPMA).<br> All duplicating refractory dies showed expansion compared to the master die.<br> The all-ceramic crowns fabricated on the duplicating refractory die in all processes, had a good fit with satisfactory expansion. However, high-fusing ceramics made by the core-finishing process (VITA Hi-ceram), had an inferior fit.<br> It was considered that shrinkage of the-duplicating refractory die during the porcelain sintering process and adhesion between the porcelain and duplicating refractory die were dominant factor in the shrinkage of the crown. The distortion of the crowns was mainly considered to be influenced by the distortion of the duplicating refractory dies.

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