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KMID : 0362420150530040330
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Journal of Korean Academy of Prosthodontics
2015 Volume.53 No. 4 p.330 ~ p.336
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Effect of interproximal undercut on the dimensional accuracy of impression
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Lee Ju-Ri
Kim Seok-Gyu
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Abstract
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Purpose: This study evaluated the effect of loss of interproximal papilla, creating an undercut, on the accuracy of impression materials.
Materials and methods: Two addition type silicone impression materials (Extrude Wash, Imprint(TM) II Quick Step Light Body) and one alginate impression material (Cavex Impressional) were used to make impressions of a maxillary master model simulating clinical conditions with or without interproximal papilla. Stone was poured in the impressions and working casts were fabricated. A total of 6 groups with 6 working casts in each group were scanned using 3-dimensional optical scanner. The accuracy of the impressions was assessed by measuring the dimensional changes (ΔI (%)) of 6 distances on working casts compared to a master model with a 3-dimensional digitizing and inspection software. The data were analyzed by two-way ANOVA (P<.05).
Results: Three of 6 distances showed statistically significant differences among the impression materials. Only 1 of 6 distances in alginate impression showed a statistically significant difference between casts with and without interproximal papilla (P=.047).
Conclusion: The presence of undercut due to loss of interproximal papilla did not significantly influence the dimensional accuracy of addition type silicone and alginate impression materials.
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KEYWORD
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Dental impression materials, Alginates, Silicone elastomers
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