마이크로 웨이브 소결 과정이 CAD/CAM 지르코니아 코아의 적합도에 미치는 영향
The Influence of Microwave Sintering Process on the Adaptation of CAD/CAM Zirconia Core
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본 연구의 목적은 전통적인 소결 방법과 마이크로 웨이브 소결 방법에 의해 제작된 지르코니아 코아의 내부 및 변연 적합도를 알아보는 것이다. 본 실험은 기존의 소결로를 이용하는 3MⓇ의 Lava(LAV), KavoⓇ사의 Everest(EVE), CerasysⓇ CAD/CAM 시스템(CER)과 마이크로웨이브 소결로를 이용하는 Dent. solutionⓇ사의 CAD/CAM 시스템(DEN)에서 시스템별로 12개씩의 코아를 제작하고 실리콘 접착제를 이용하여 금속 다이에 부착시켰다. SkyscanⓇ 1076 미세 단층 촬영기를 이용해 각각의 시편을 촬영한 후 재구성하였다. 각 시편에 대해 B-L상, M-D상 절단면 및 치아 장축에 대한 횡단면을 구해내고 각각의 단면에 대해 변연 간격, 축면 간격, 교합면 간격을 측정하였다. 실험에 대한 결과는 다음과 같다. 1. 변연 간격은 EVE가 36.20μm로 가장 작았고, LAV는 47.67μm, DEN는 52.47μm, CER은 54.63μm를 나타내었다. 2. 축면 간격은 EVE가 63.49μm로 가장 큰 값을 나타내었으나 네군간에는 유의차는 없었다. 3. 교합면 간격은 DEN이 77.06μm으로 가장 작은 값을 나타내었으며, EVE와 CER은 100μm를 넘는 값으로 다른 두군과 유의차를 보였다. 본 연구에서 마이크로웨이브 소결을 통해 제작된 CAD/CAM 지르코니아 코아는 임상적으로 허용할 만한 변연 간격 및 축면 간격, 교합면 간격을 보여 주었다.
Abstract
The purpose of this research was to examine the fitness of zirconia cores that were made by different sintering methods; generic electricity furnace and microwave furnace. Firstly, 12 cores for each group were made by using each different sintering process and attached them to a metal die with silicon. The internal and marginal gap of sintered zirconia was measured by using Skyscan 1076 micro-CT, then it was reorganized by CT-An software. To each samples, we extracted B-L image, M-D image of cutting side, and cross-sectional side of tooth long axis and calculated the mean value of marginal, axial, and occlusal gap each side. Results: 1. The mean marginal gap of sintered zirconia was 36.20μm for EVE, 47.67μm for LAV, 52.47μm for DEN, and 54.63μm for CER. 2. For the axial wall, the research showed the largest value of 63.49um for EVE, but there were no statistical significance. 3. In related to the occlusal internal measurement, DEN showed the smallest value (77.06um), EVE and CER showed significantly high value. From this study, it is suggested that CAD/CAM zirconia core which was made in the process of microwave sintering has clinically acceptable values in marginal and internal gap.
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