In-vitro Comparison of Effect of Two Moulding and Polishing Methods on the Surface Roughness of Heat Polymerized Resin
Abstract:
Acrylic resin is the most common
material used for the fabrication of bases for prostheses including
overdentures. A smooth surface is ideal for the maintenance of dentures and the
prevention of bacterial colonization. Polishing materials used and the method
of moulding are the few factors that affect surface roughness. Hence the
present in vitro study was done to compare the effect of polishing materials
and moulding methods on the surface roughness of dentures. 120 specimens (50mm
× 3mm) were divided into two equal groups and fabricated by compression and
injection moulding techniques. Each group was subdivided into 3 groups based on
the polishing method viz: control (pumice), pumice with universal polishing
paste and pumice with rouge based on the polishing protocols advocated.
Determination of surface roughness was done with a profilometer. Statistical
analysis was done with one-way ANOVA and Tukey HSD. The surface roughness
ranged between 0.372 ± 1.340 and 0.046 ± 0.027. In both the moulding methods
control group with pumice exhibited the greatest surface roughness in
comparison with the other two groups and universal polishing paste produced the
least. On comparing the two moulding methods the
injection moulding method exhibited the least surface roughness.
(p=0.0001). From the results of the study, it can be inferred that irrespective
of the moulding method polishing using pumice and universal polishing paste
would produce a smooth surface with the least roughness and could be
implemented by all clinicians to bacterial colonisation and plaque formation in
dentures.
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