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KMID : 0362420080460050528
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Journal of Korean Academy of Prosthodontics
2008 Volume.46 No. 5 p.528 ~ p.534
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Comparison of marginal fit before and after porcelain build-up of two kinds of CAD/CAM zirconia all-ceramic restorations
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Shin Ho-Sik
Kim Seok-Gyu
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Abstract
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Purpose: Marginal fit is one of the important components for the successful prosthodontic restoration. Poor fitting margin of the restoration causeshypersensitivity, secondary caries, and plaque accumulation, which later result in prosthodontic failure. CAD/CAM zirconia all-ceramic restorations,such as LAVA (3M ESPE, St.Paul, MN) and EVEREST (KaVo Dental GmbH, Biberach, Germany) systems were recently introduced in Korea.It is clinically meaningful to evaluate the changes of the marginal fit of the CAD/CAM zirconia systems before and after build-up. The purposes ofthis study are to compare the marginal fit of the two CAD/CAM all-ceramic systems with that of the ceramometal restoration, before and after porce-lain build-up
Material and methods: A maxillary first premolar dentiform tooth was prepared with 2.0 mm occlusal reduction, 1.0 mm axial reduc-tion, chamfer margin, and 6 degree taperness in the axial wall. The prepared dentiform die was duplicated into the metal abutment die. The metal diewas placed in the dental study model, and the full arch impressions of the model were made. Twenty four copings of 3 groups which were LAVA,EVEREST, and ceramometal restorations were fabricated. Each coping was cemented on the metal die with color-mixed Fit-checker II (GC Cor.,Tokyo, Japan). The marginal opening of each coping was measured with Microhiscope system (HIROX KH-1000 ING-Plus, Seoul, Korea. X300magnification). After porcelain build-up, the marginal openings of LAVA, EVEREST,and ceramometal restorations were also evaluated in thesame method. Statistical analysis was done with paired t-test and one-way ANOVA test.
Results: In coping states, the mean marginal opening forEVEREST restorations was 52.00 ± 11.94 ㎛, for LAVA restorations 56.97 ± 10.00 ㎛, and for ceramometal restorations 97.38 ± 18.54 ㎛.After porcelain build-up, the mean marginal opening for EVEREST restorations was 61.69 ± 19.33 ㎛, for LAVA restorations 70.81 ± 12.99㎛, and for ceramometal restorations 115.25 ± 23.86 ㎛.
Conclusion: 1. LAVA and EVEREST restorations in comparison with ceramometalrestorations showed better marginal fit, which had significant differences (P < 0.05) in coping state and also after porcelain build-up . 2. The meanmarginal opening values between LAVA and EVEREST restorations did not showed significant differences after porcelain build-up as well as incoping state (P > .05). 3. EVEREST, LAVA and ceramometal restorations showed a little increased marginal opening after porcelain build-up,but did not show any statistical significance (P > .05).
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KEYWORD
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Marginal fit, CAD/CAM zirconia all-ceramic restoration
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