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논문 기본 정보

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학술저널
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대한치과보철학회 The Journal of Advanced of Prosthodontics The Journal of Advanced of Prosthodontics 제2권 제2호
발행연도
2010.1
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33 - 38 (6page)

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PURPOSE. Marginal fit is a very important factor considering the restoration’s long-term success. However, adding porcelain to copings can cause distortion and lead to an inadequate fit which exposes more luting material to the oral environment and causes secondary caries. The purpose of this study was to compare the marginal fit of 2 different all-ceramic crown systems before and after porcelain veneering. This study was also intended to verify the marginal fit of crowns originated from green machining of partially sintered blocks of zirconia (Lava CAD/CAM system) and that of crowns obtained through machining of fully sintered blocks of zirconia (Digident CAD/CAM system). MATERIALS AND METHODS. 20 crowns were made per each system and the marginal fit was evaluated through a light microscope with image processing (Accura 2000) at 50 points that were randomly selected. Each crown was measured twice: the first measurement was done after obtaining a 0.5 mm coping and the second measurement was done after porcelain veneering. The means and standard deviations were calculated and statistical inferences among the 2 groups were made using independent t-test and within the same group through paired t-test. RESULTS. The means and standard deviations of the marginal fit were 61.52 ± 2.88 μm for the Digident CAD/CAM zirconia ceramic crowns before porcelain veneering and 83.15 ± 3.51 μm after porcelain veneering. Lava CAD/CAM zirconia ceramic crowns showed means and standard deviations of 62.22 ± 1.78 μm before porcelain veneering and 82.03 ± 1.85 μm after porcelain veneering. Both groups showed significant differences when analyzing the marginal gaps before and after porcelain veneering within each group. However, no significant differences were found when comparing the marginal gaps of each group before porcelain veneering and after porcelain veneering as well. CONCLUSION. The 2 all-ceramic crown systems showed marginal gaps that were within a reported clinically acceptable range of marginal discrepancy.
#Marginal fit #Digident CAD/CAM Zirconia Ceramic Crown #Lava CAD/CAM Ceramic Crown #Porcelain veneering

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참고문헌 (23)

참고문헌 신청
Balkaya MC / 2005 / Influence of firing cycles on the margin distortion of 3 all-ceramic crown systems / J Prosthet Dent 93 : 346 ~ 355 google schola Beschnidt SM / 1999 / Evaluation of the marginal accuracy of different all-ceramic crown systems after simulation in the artificial mouth / J Oral Rehabil 26 : 582 ~ 593 google schola Castellani D / 1994 / Thermal distortion of different materials in crown construction / J Prosthet Dent 72 : 360 ~ 366 google schola Davis DR / 1988 / Comparison of fit of two types of all-ceramic crowns / J Prosthet Dent 59 : 12 ~ 16 google schola Gardner FM / 1982 / Margins of complete crowns-literature review / J Prosthet Dent 48 : 396 ~ 400 google schola

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