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http://dx.doi.org/10.4047/jkap.2015.53.4.330

Effect of interproximal undercut on the dimensional accuracy of impression  

Lee, Ju-Ri (Department of Prosthodontics, Samsung Medical Center, College of Medicine, Sungkyunkwan University)
Kim, Seok-Gyu (Department of Prosthodontics, Samsung Medical Center, College of Medicine, Sungkyunkwan University)
Publication Information
The Journal of Korean Academy of Prosthodontics / v.53, no.4, 2015 , pp. 330-336 More about this Journal
Abstract
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 ($Extrude^{(R)}$ Speed 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 (${\Delta}I$ (%)) 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.
Keywords
Dental impression materials; Alginates; Silicone elastomers;
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