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KMID : 0988720080240040325
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Journal of the Korean Academy of Stomatognathic Function and occlusion
2008 Volume.24 No. 4 p.325 ~ p.335
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A Study on the Influence of Finishing and Polishing Methods on the Gap between Denture Base Resin and Soft Liner
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Jeong Seung-Hwan
Lee Joon-Seok
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Abstract
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The junction between resilient denture liner and the denture base is difficult to finish and polish due to difference of the physical property of the materials. Gaps tend to be formed during finishing and polishing procedures. The purpose of this study was measuring the width of junctional gap between Molloplast-B® and denture base material after finishing and polishing procedure, and evaluating the effect of method and direction on gap width. Molloplast-B® was processed (according to the manufacturer’s instruction) against Lucitone 199® acrylic resin. 50 specimens were fabricated with a raised center section. All of specimens were examined and photographed with a stereoscopic microscope(x120), and the largest gap along the junction of Molloplast-B® and acrylic resin on each specimen was measured. One-way analysis of variance(ANOVA) and independent t-test at 95% confidence level were used to analyze the data and to compare groups. The results of this study were as follows. In comparison with finishing tools, the gap width was the largest in Molloplast®-Cutter and the smallest in FSQ-cross cut bur. There was statistically significant difference between FSQ-cross cut bur and Molloplast®-Cutter(p<0.05). There was no significant difference in gap width between the direction of polishing. The mean value of gap width was the smallest in case of no polishing, and the largest in case of polishing with pumice & tin oxide. There was statistically significant difference between pumice and pumice & tin oxide. From the results, it is concluded that the use of Molloplast®-Cutter in clinic need serious consideration even though it has good cutting ability. Further careful study is needed for finishing and polishing methods for decreasing gap width in junction of two materials.
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KEYWORD
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Molloplast-B®, Molloplast®-Cutter, Gap width, Finishing and polishing, Direction
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