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KMID : 1023820180100020128
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The Journal of Advanced Prosthodontics
2018 Volume.10 No. 2 p.128 ~ p.131
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Precision of the milled full-arch framework fabricated using pre-sintered soft alloy: A pilot study
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Woo Hyun-Wook
Cho Sung-Am
Lee Cheong-Hee
Lee Kyu-Bok
Cho Jin-Hyun
Lee Du-Hyeong
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Abstract
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PURPOSE: This study aimed to evaluate the marginal discrepancy of full-arch frameworks in implant-supported prostheses fabricated using pre-sintered soft alloy (PSA).
MATERIALS AND METHODS: Full-arch metal frameworks were fabricated on the edentulous implant model using casting alloy (CA), fully-sintered hard alloy (FHA), and PSA (n = 4 in each group). To evaluate the misfit of the framework to the abutments, the absolute marginal discrepancy (AMD) values of the frameworks were measured in cross-sectional images that had been drawn as part of the triple-scan protocol. The AMD values were compared among the tested alloy groups using the Kruskal-Wallis test, with a post hoc Mann-Whitney U test (α=.05).
RESULTS: The FHA and PSA groups showed lower marginal discrepancies than the CA group (P<.001). However, the FHA group did not differ significantly from the PSA group.
CONCLUSION: Soft alloy milling is comparable to hard alloy milling, and it is more precise than casting in terms of the marginal fit of implant-supported, full-arch prostheses.
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KEYWORD
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Precision, Full arch framework, Pre-sintered soft alloy, Marginal discrepancy, Triple scan technique
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