J Korean Acad Prosthodont.  2011 Apr;49(2):101-105. 10.4047/jkap.2011.49.2.101.

A study on the marginal fit of CAD/CAM 3-unit bridges

  • 1Department of Prosthodontics, College of Dentistry, Seoul National University, Seoul, Korea. jhoyang@snu.ac.kr


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.
#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 x75. Independent t-test was done for the statistical analysis.
The mean marginal discrepancy values and standard deviations of the PFG bridges was 97.1 +/- 18.7 microm for incisors, 76.6 +/- 21.8 microm for canines; that of the LAVA bridges was 90.4 +/- 26.7 microm for incisor, 110.2 +/- 30.2 microm 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).
The LAVA CAD/CAM 3-unit bridges and the PFG 3-unit bridges showed clinically acceptable marginal discrepancy.


CAD/CAM; LAVA; PFG; Marginal fit

MeSH Terms



  • Fig. 1. Prepared resin teeth embedded in stone (labial view).

  • Fig. 2. Prepared resin teeth embedded in stone (incisal view).

  • Fig. 3. Resin models.

  • Fig. 4. LAVA and PFG bridges.


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