Cp. Fernandes et N. Vassilakos, ACCURACY, DETAIL REPRODUCTION, AND HARDNESS OF GYPSUM CASTS PRODUCED FROM SILICONE IMPRESSIONS TREATED WITH GLOW-DISCHARGE, The Journal of prosthetic dentistry, 70(5), 1993, pp. 457-464
Plasma treatment has been reported to improve the wettability of silic
one impression materials. This study investigated whether plasma treat
ment of silicone impressions influenced the linear dimensional accurac
y, detail reproducibility, and surface hardness of models produced fro
m a type IV dental die stone. Five silicone impression materials were
used in this study. Linear dimensional accuracy and detail reproductio
n were tested according to ISO standards. Surface hardness was evaluat
ed with a Vickers hardness test. The results indicated that plasma-tre
ated impressions from Xantopren and Provil silicone impression materia
ls had significantly smaller dimensional change than their respective
controls, and the other materials were not influenced. The detail repr
oduction was superior in casts produced from plasma-treated impression
s from President silicone. Surface hardness was not influenced by the
treatment. Plasma treatment of silicone impressions has no negative in
fluence on the tested physical properties of die stone models.