Digital assessment of properties of the three diferent generations of dental elastomeric impression materials
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Date
2022-09
Journal Title
Journal ISSN
Volume Title
Type
Article
Publisher
BioMed Central Ltd.
Series Info
Singer et al. BMC Oral Health;(2022) 22:379
Scientific Journal Rankings
Abstract
Background: This study aimed to compare the dimensional accuracy, hydrophilicity and detail reproduction of the
hybrid vinylsiloxnether with polyether and polyvinylsiloxane parent elastomers using modifed digital techniques
and software. This was done in an attempt to aid in solving the confict between the diferent studies published by
competitive manufacturers using diferent common manual approaches.
Methods: A polyether, polyvinylsiloxanes and vinyl polyether silicone hybrid elastomeric impression materials were
used in the study. Dimensional accuracy was evaluated through taking impressions of a metallic mold with four
posts representing a partially edentulous maxillary arch, that were then poured with stone. Accuracy was calculated
from the mean of measurements taken between fxed points on the casts using digital single-lens refex camera to
produce high-resolution digital pictures for all the casts with magnifcation up to 35×. Hydrophilicity was assessed by
contact angle measurements using AutoCAD software. The detail reproduction was measured under dry conditions
according to ANSI/ADA Standard No. 19 and under wet conditions as per ISO 4823. A metallic mold was used with
three V shaped grooves of 20, 50, and 75 µm width. Specimens were prepared and examination was made immedi‑
ately after setting using digital images at a magnifcation of 16×.
Results: The hybrid impression (0.035 mm) material showed signifcantly higher dimensional accuracy compared
to the polyether (0.051 mm) but was not as accurate as the polyvinyl siloxane impression material (0.024 mm). The
contact angles of the hybrid material before and after setting was signifcantly lower than the parent materials. With
regard to the detail reproduction, the three tested materials were able precisely to reproduce the three grooves of
the mold under dry conditions. Whereas, under wet conditions, the hybrid material showed higher prevalence of
well-defned reproduction of details same as polyether but higher than polyvinylsiloxane that showed prevalence of
details with loss of sharpness and continuity.
Conclusions: The digital technique used could be a more reliable and an easier method for assessment of impres‑
sion materials properties. The hybridization of polyvinyl siloxane and polyether yielded a promising material that
combines the good merits of both materials and overcomes some of their drawbacks.
Description
Keywords
Polyvinylsiloxane, Polyether hybrid, Hydrophilicity, Silicone elastomers, Dimensional accuracy