지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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Purpose: All ceramic crown, made from zirconia instead of metal for core material, is recognized the best esthetical prosthesis. Recently, high-priced zirconia blocks and expensive CAD/CAM machines come into use for making zirconia core. In this study, slip casting process is adapted to evaluate the possibility of the recycling the remained parts of zirconia block after machining. Methods: Remained zirconia blocks were reduced to powders with zirconia mortar, and screened with 180 mesh sieve. Passed powders were ball milled under various conditions to obtain the optimum zirconia slip for casting. Solid casting method was used for casting the specimens with plaster mold. Formed specimens were dried and biscuit fired at $1,000^{\circ}C$ for 1 hour. Biscuit fired specimens were finished with exact shape of square pillar. Finished specimens were fired from $1,200^{\circ}C$ to $1,550^{\circ}C$ at $50^{\circ}C$ intervals for 1 hour. Linear shrinkage, apparent porosity, water absorption, bulk density, and flexural strength were tested. Microstructures were observed by SEM. Results: Above examinations indicated that the optimum firing temperture was $1,500^{\circ}C$, and when fired at this temperature for 1 hour, apparent porosity was 0% and flexural strength was 680MPa. SEM photomicrographs showed uniform 200~300nm grain size, which is equal with microcture of sintered commercial zirconia block. when compare 24% linear shrinkage of cast specimen with 20% linear shrinkage of CAD/CAM machined block, it was estimated that the size controlling of cast core was not so difficult. Conclusion: According to the all of this experimental results, the cast zirconia core produced from the remained parts of zirconia block was possible to use for all ceramic denture.
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참고문헌 (9)
참고문헌 신청
Andersson MA / 1998 / Procera: a new way to achieve an all-ceramic crown / Quintessence Int 29:285~296
Boenting KW / 2000 / Clinical fit of Procera Allceram crowns / J Prosthet Dent 84:419~424
전미현 / 2005 / CAM Zirconia 완전도재 구조물의 정밀 적합도에 관한 연구 / 대한치과보철학회지 43(5):611~621
Jiles D / 1994 / Introduction to the Electronic Properties of Material / Chapman & Hall :3~7
Lawn BR / 2001 / Use of contact testing in the characteriztion and design of all-ceramic crown-like layer structures: A review / J Prosthet Dent 86:495~510
Boenting KW / 2000 / Clinical fit of Procera Allceram crowns / J Prosthet Dent 84:419~424
전미현 / 2005 / CAM Zirconia 완전도재 구조물의 정밀 적합도에 관한 연구 / 대한치과보철학회지 43(5):611~621
Jiles D / 1994 / Introduction to the Electronic Properties of Material / Chapman & Hall :3~7
Lawn BR / 2001 / Use of contact testing in the characteriztion and design of all-ceramic crown-like layer structures: A review / J Prosthet Dent 86:495~510
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