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KMID : 1023820170090040239
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The Journal of Advanced Prosthodontics
2017 Volume.9 No. 4 p.239 ~ p.243
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Evaluation of marginal and internal gaps in single and three-unit metal frameworks made by micro-stereolithography
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Kim Dong-Yeon
Lee Ha-Na
Kim Ji-Hwan
Kim Hae-Young
Kim Woong-Chul
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Abstract
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PURPOSE: The purpose of this study is to compare single and three-unit metal frameworks that are produced by micro-stereolithography.
MATERIALS AND METHODS: Silicone impressions of a selected molar and a premolar were used to make master abutments that were scanned into a stereolithography file. The file was processed with computer aided design software to create single and three-unit designs from which resin frameworks were created using micro-stereolithography. These resin frameworks were subjected to investment, burnout, and casting to fabricate single and three-unit metal ones that were measured under a digital microscope by using the silicone replica technique. The measurements were verified by means of the Mann-Whitney U test (α=.05).
RESULTS: The marginal gap was 101.9 ± 53.4 μm for SM group and 104.3 ± 62.9 μm for TUM group. The measurement of non-pontics in a single metal framework was 93.6 ± 43.9 μm, and that of non-pontics in a three-unit metal framework was 64.9 ± 46.5 μm. The dimension of pontics in a single metal framework was 110.2 ± 61.4 μm, and that of pontics in a three-unit metal framework was 143.7 ± 51.8 μm.
CONCLUSION: The marginal gap was smaller for the single metal framework than for the three-unit one, which requires further improvement before it can be used for clinical purposes.
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KEYWORD
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CAD/CAM, Micro-stereolithography, Metal framework, Marginal gap, Internal gap
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