Abstract
ABSTRACT Objective: The purpose of this in vitro study was to assess and compare the dimensional accuracy of three impression techniques: 1-step putty/light-body, 2-step putty/light-body, and the monophase technique. Methods: A partially edentulous standard stainless steel mandibular arch cast with reference points on the teeth was used to make the impressions. The anteroposterior and transverse distances were measured. All impressions were made with a polyvinyl siloxane using stock metallic (1- and 2-step putty/light-body techniques) or acrylic resin (monophase technique) trays. The monophase impressions were made using a light-body material and the 1- and 2-step putty/light-body impressions with putty and light-body materials. After impression procedures, the accuracy of each technique was assessed measuring the stone casts (n = 5) poured from the impressions using a microscope at 30x magnification and at 0.5 µm accuracy. The data were analyzed statistically using 2-way ANOVA and Tukey's test (p<0.05). Results: Stone casts made by all techniques had significantly negative linear changes (shrinkage). The anteroposterior distances showed more dimensional changes than the transverse distances. The edentulous side showed more shrinkage than the anteroposterior side. Conclusion: No differences between the impression techniques were found, but significant dimensional changes were observed.
Highlights
A denture fitted to the oral cavity is important for long-term prosthetic treatment success[1]
Stone casts made by all techniques had significantly negative linear changes
Two-way ANOVA showed that distance 3 presented the highest values of dimensional change, for all impression techniques, followed by distances 4 and 1, which were statistically different (p
Summary
A denture fitted to the oral cavity is important for long-term prosthetic treatment success[1]. A complete prosthetic treatment involves several clinical and laboratory procedures, such as impressions, cast/die pouring and prosthesis fabrication[1,2]. The impression material plays an important role in minimizing errors when producing accurate replicas of the oral structures[1,4]. The elastomeric impression materials are materials with high accuracy and have been used in dentistry since the 1950s. There are four types of elastomeric impression materials: polyether, polysulfide, condensation and addition silicones (polyvinyl siloxanes). Each one of these displays individual physical properties and specific chemical and setting reactions[5,6]
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