PubMed · 6572520
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D C Watts, C M Haywood, R Smith. 1983-02-19. Thermal diffusion through composite restorative materials.. https://doi.org/10.1038/sj.bdj.4805003
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Metal bases sometimes are used to enhance the physical properties of complete dentures. Unfortunately, improper positioning of metal-resin finish lines may adversely affect phonetics. In the past, placement of these finish lines has been somewhat arbitrary. This article describes a precise method for the placement and contour of metal-resin finish lines. The resultant prostheses should exhibit surfaces that reestablish proper anatomic, physiologic, and phonetic contours.
Five resin-modified glass ionomers and amalgam, used as a base or core buildup material, were clinically evaluated for whether they effected polymerization of a low viscosity (light body) regular set polyvinyl siloxane impression material. A total of 20 samples per group was prepared according to the manufacturer's recommendations. Ten samples from each group were handled with latex gloves during mixing and the other 10 were handled with vinyl gloves. Five of the 10 samples had the outer surface prepared with a round diamond wheel. Impressions were made of all the samples. The impression materials were visually scored inhibited or noninhibited. Inhibited impression materials met at least one following criterion: (1) an oily substance on the surface of the impression readily collected on a sterile explorer tine as it was moved across the impression surface; (2) a rippled appearance on the surface of the impression material; or (3) unpolymerized impression material adherent to the prepared sample surface. If none of the criteria were observed, the impression was scored noninhibited. The data were analyzed with the chi square analysis (level of significance p = 0.05). Total chi square analysis revealed a significant difference between brands (p = 0.0001) and between prepared and non-prepared samples (p = 0.001). Interrater reliability data were analyzed with the kappa correlation analysis. Raters were in complete agreement (kappa = +1). The prepared samples of Vitrebond material had an inhibitory effect on the polymerization of Express impression material.