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KMID : 0362420110490020101
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Journal of Korean Academy of Prosthodontics
2011 Volume.49 No. 2 p.101 ~ p.105
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A study on the marginal fit of CAD/CAM 3-unit bridges
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Lee Ki-Hong
Yeo In-Sung
Kim Sung-Hun
Han Jung-Suk
Lee Jai-Bong
Yang Jae-Ho
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Abstract
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PURPOSE: The purpose of this study was to assess the marginal fit of three-unit bridges produced using LAVA CAD/CAM (computer-aided design/computer-aided manufacturing) system and conventional PFG in vitro.
MATERIALS AND METHODS: #11, 13 resin teeth were prepared on dentiform, then duplicated. Twenty resin models were fabricated, ten for PFG 3-unit bridges and ten for LAVA 3-unit bridges. Each bridge was cemented on the resin model. Marginal discrepancy was measured with stereoscopic microscope (Nikon DS-Fi 1, Nikon, Japan) at a magnification of ×75. Independent t-test was done for the statistical analysis.
RESULTS: The mean marginal discrepancy values and standard deviations of the PFG bridges was 97.1 ± 18.7 ㎛ for incisors, 76.6 ± 21.8 ㎛ for canines; that of the LAVA bridges was 90.4 ± 26.7 ㎛ for incisor, 110.2 ± 30.2 ㎛ for canines. The mean marginal discrepancy between PFG and LAVA for incisor did not show significant difference (P>.05). But for canine, the mean marginal discrepancy of PFG bridges was smaller than that of LAVA bridges (P<.05).
CONCLUSION: The LAVA CAD/CAM 3-unit bridges and the PFG 3-unit bridges showed clinically acceptable marginal discrepancy.
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KEYWORD
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CAD/CAM, LAVA, PFG, Marginal fit
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