Journal List > J Korean Acad Prosthodont > v.49(2) > 1034651

Lee, Yeo, Kim, Han, Lee, and Yang: A study on the marginal fit of CAD/CAM 3-unit bridges

Abstract

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. (J Korean Acad Prosthodont 2011;49:101-5)

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Fig. 1.
Prepared resin teeth embedded in stone (labial view).
jkap-49-101f1.tif
Fig. 2.
Prepared resin teeth embedded in stone (incisal view).
jkap-49-101f2.tif
Fig. 3.
Resin models.
jkap-49-101f3.tif
Fig. 4.
LAVA and PFG bridges.
jkap-49-101f4.tif
Table 1.
Mean values and standard deviations of marginal fit in each groups (㎛
LAVA incisor LAVA canine PFG incisor PFG canin
Mean 90.4 110.2 97.1 76.6
SD 26.7 30.2 18.7 21.8
Table 2.
Independent t-test
    t-test for Equality of Means
t df Sig. (2-tailed)
FPDIN Equal variences assumed -0.651 18 .523
  Equal variences not assumed -0.651 16.096 .524
FPDCA Equal variences assumed 2.854 18 .011
  Equal variences not assumed 2.854 16.39 .011
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