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리튬 디실리케이트 최종 결정화 과정이 CAD/CAM으로 제조된 수복물의 적합도에 미치는 영향

Influence of final crystallization process on precision of fit of monolithic CAD/CAM-generated restorations by lithium disilicate: A comparative study

대한치과기공학회지 2019년 41권 4호 p.271 ~ 278
김재홍 ( Kim Jae-Hong ) - 부산가톨릭대학교 보건과학대학 치기공학과

김기백 ( Kim Ki-Baek ) - 대전보건대학교 치기공과

Abstract


Purpose: To quantify the effect of the crystallization process on lithium disilicate ceramic crowns that are fabricated using a computer-aided design/computer-aided manufacturing(CAD/CAM) system, and to determine whether they are clinically acceptable by comparing values before and after the crystallization process.

Methods: The maxillary first molar was selected as the abutment for the experiments. Ten working models were prepared. Marginal and internal gap of 4 groups of lithium disilicate crowns(n=10) fabricated with conventional method. Comparison was performed using the silicone replica technique and 3D superimposition analysis. The marginal and internal gaps of the restoration were measured before and after the crystallization process of this prosthesis. The average value of each part(the average of values measured before and after the crystallization) was statistically analyzed using paired t-test(α=0.05).

Results: The results from the second phase of this research, which compared the average value of the gap between the marginal and internal fits of the lithium disilicate single crown before and after the crystallization process, indicated that the marginal gap was larger and the internal gap was smaller after the crystallization process, and this difference was statistically significant (P<0.05) in all the parts evaluated.

Conclusion: While the shrinkage that occurs during crystallization does affect the marginal and internal fit of the prosthesis, it cannot be concluded to be a major effect because the resultant distortion was within the clinically acceptable range.

키워드

All-ceramic restoration; Crystallization process; Fit; Lithium disilicate
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