J Korean Acad Prosthodont.  2015 Oct;53(4):330-336. 10.4047/jkap.2015.53.4.330.

Effect of interproximal undercut on the dimensional accuracy of impression

• Lee JR
• Kim SG

• KMID: 2118805
• DOI: http://doi.org/10.4047/jkap.2015.53.4.330

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) 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 (DeltaI (%)) 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.

Keyword

Dental impression materials; Alginates; Silicone elastomers

MeSH Terms

Alginates
Dental Impression Materials
Silicone Elastomers
Alginates
Dental Impression Materials
Silicone Elastomers

Figure

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  Fig. 1. Six distances (mm) for measurement of the master model on the 3D digitizing & inspection software. (A) interabutment distance between points on mesial line angle of right second premolar and distal line angle of right second molar,(B) interabutment distance between points on distal line angle of right second premolar and mesial line angle of right second molar, (C) distance between right canine cusp tip and point on distal line angle of right second molar, (D) distance between left canine cusp tip and point on distal line angle of right second molar, (E) intercanine distance between right and left canine cups tips, (F) intermolar distance between points on distal line angles of right and left second molars).

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  Fig. 2. ATOS III Triple Scan, GOM mbH, Braunschweig, Germany.

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  Fig. 3. An image of two superimposed models on the ATOS Professional 3D digitizing & inspection software.

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  Fig. 4. Means of distortion ∆I (%) on each group.1: Model with no undercut, 2: Model with undercut, EXT: Extrude® Wash, IMP: Imprint TM II Quick Step light body, ALG: Cavex Impressional (normal set).

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