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KMID : 0362120230450010001
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Journal of Technologic Dentistry
2023 Volume.45 No. 1 p.1 ~ p.7
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Evaluation of marginal and internal fit of metal copings fabricated by selective laser melting
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Bae Sung-Ryung
Lee Ha-Bin
Noh Mi-Jun
Kim Ji-Hwan
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Abstract
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Purpose: To evaluate the marginal and internal fit of metal coping fabricated by a metal three-dimensional (3D) printer that uses selective laser melting (SLM).
Methods: An extraoral scanner was used to scan a die of the prepared maxillary right first molar, and the coping was designed using computer-aided design software and saved as an stereo lithography (STL) file. Ten specimens were printed with an SLM-type metal 3D printer (SLM group), and 10 more specimens were fabricated by casting the castable pat-terns output generated by a digital light processing-type resin 3D printer (casting the 3D printed resin patterns [CRP] group). The fit was measured using the silicon replica tech-nique, and 8 points (A to H) were set per specimen to measure the marginal (points A, H) and internal (points B~G) gaps. The differences among the groups were compared using the Mann-Whitney U-test (α=0.05).
Results: The mean of marginal fit in the SLM group was 69.67±18.04 μm, while in the CRP group was 117.10±41.95 μm. The internal fit of the SLM group was 95.18±41.20 μm, and that of the CRP group was 86.35±32 μm. As a result of statistical analysis, there was a sig-nificant difference in marginal fit between the SLM and CRP groups (p<0.05); however, there was no significant difference in internal fit between the SLM group and the CRP group (p>0.05).
Conclusion: The marginal and internal fit of SLM is within the clinically acceptable range, and it seems to be applicable in terms of fit.
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KEYWORD
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Dental marginal adaptation, Dental internal fit, Metal three-dimensional print-ing, Resin three-dimensional printing, Selective laser melting
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