Coating of XXXX -based impression materials in a glow-discharge system by acrylic acid plasma.

@entity3358 @entity1346 @entity11945 @entity3787
OBJECTIVES: The main purpose of this study was to demonstrate an increase in the wettability of @entity1346 -based impression materials after coating them with a hydrophilic film in a glow-discharge system. METHODS: Two @entity11945 impression materials, Extrude (Kerr) and Accuflex (GC America Inc.) were used. Impression specimens were treated in a glow-discharge reactor at a radio frequency of 13.56 MHz at different discharge powers (5-20 W) and exposure times (5-60 min). Surface analysis of the specimens was done by FTIR. Surface contact angles were obtained by a captive-bubble method. These results were analyzed by ANOVA and Duncan's Multiple Range test (p < 0.05). The total number of voids on the die stone casts was observed microscopically. Linear dimensional accuracy, detail reproducibility, and surface @entity3358 of the die stone casts were also determined. A Student t-test was performed for statistical analysis of these parameters (p > 0.05). RESULTS: FTIR spectra indicated that the number of @entity3787 groups on the surfaces increased (p > 0.05) because of the glow-discharge treatment. Contact angle measurements showed an increase (p < 0.05) in surface hydrophilicity. Total void formation in the stone casts decreased. There were no significant differences in the linear dimensional accuracy, detail reproducibility, and @entity3358 , before and after glow-discharge treatment (p > 0.05). SIGNIFICANCE: It was concluded that the surface wettability of the impression materials may be increased by plasma deposition, and therefore, the formation of voids was reduced in the stone casts.
