Effect of different impression techniques and elastomeric impression materials on the dimensional accuracy of partially edentulous mandibular arch
Braz. j. oral sci
;
15(3)July-Sept. 2016. tab
Article
in English
| LILACS, BBO
| ID: biblio-875098
ABSTRACT
Aim:
Evaluate the dimensional accuracy of stone casts of a partially edentulous mandibular arch made by two impression techniques (1-step putty/light-body and 2-step putty/light-body) using addition and condensation silicones.Methods:
A partially edentulous steel stainless cast with four markings on teeth 33, 37, 43, and 47 was used to obtain the impressions. The transverse (33-43 and 37-47) and anteroposterior (33-37 and 43-47) distances were measured by measuring microscope (30x magnification; 0.5µm accuracy). For the 1-step putty/light-body technique, both viscosities of the impression materials were handled together. For the 2-step putty/light-body technique, the impression materials of different viscosities were handled separately and a polypropylene spacer (2 mm thick) was used to create a relief. The same distances were measured on stone casts (n = 5). The values were submitted to normality test (Kolmogorov-Smirnov) and analyzed statistically by three-way ANOVA and Tukey's (5%).Results:
All distances showed shrinkage (negative linear changes). The addition silicones showed better accuracy than condensation silicones (p<0.05) and no significant difference was found between the impression techniques (p>0.05). The edentulous zone (43-47) presented worst dimensional accuracy results.Conclusions:
The accuracy of the casts is more related to the impression material than impression technique. (AU)
Full text:
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Index:
LILACS (Americas)
Main subject:
Silicone Elastomers
/
Dental Impression Technique
/
Dimensional Measurement Accuracy
Language:
English
Journal:
Braz. j. oral sci
Journal subject:
Dentistry
Year:
2016
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade de Campinas/BR
/
Universidade de Taubaté/BR
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