Effect of Brushing with Different Cleansing Solutions on Surface Roughness of Two Denture Base Materials
Main Article Content
Abstract
The most common cleansing method for removable denture is brushing. However, brushing causes the surface roughness of denture base. The degree of roughness could be affected and varied with the abrasive properties of cleansing agents. This study aimed to compare the abrasiveness of three different cleansing solutions distilled water, dentifrice (Colgate®), dishwashing liquid solutions (Sunlight®) on poly (methyl) methacrylate (PMMA; VertexTM) and a polyamide (Bioplast®). Forty-eight specimen blocks of PMMA and polyamide were prepared (n=24) and randomly assigned to the distilled water, dentifrice, and dishwashing liquid groups (n=8). The simulated brushing was performed by immersion specimen in the assigned cleansing solution and brushing using an automatic brushing machine. Surface roughness (SR) was measured using the average value of roughness (Ra) by the contact profilometer before and after 20k- and 40k-cycle of brushing. The differences of Ra among cleansing solutions were determined by the Kruskal-Wallis with Mann-Whitney U post hoc test. The pairwise comparisons between two time points were estimated by the Wilcoxon signed-rank test. Scanning electron microscope (SEM) was also used to observe surface topography. Mechanical cleansing by brushing with cleansing solutions caused an increase of SR in both PMMA and polyamide. In PMMA brushing with dentifrice resulted in the highest Ra after 20k- and 40k-cycle (0.230 µm and 2.411 µm, respectively), meanwhile dishwashing liquid caused the roughness comparable with distilled water. For polyamide, the Ra of dentifrice and dishwashing liquid groups after 40k-cycle were 0.109 µm and 0.139 µm which were significantly greater than brushing with water. In conclusion, mechanical cleansing with dentifrice caused the SR with the statistical significance in PMMA. On the contrary, SR caused by brushing on polyamide with dentifrice and dishwashing liquid were slightly increased but still below the acceptable threshold for oral biofilm retention after 40k-cycle. Dentures with the long-term brushing with dentifrice should be regularly monitored the surface morphology. Dishwashing liquid can be used as a reasonably alternative denture cleansing solution based on the simplicity, cost-effectiveness, and non-abrasive property.
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บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการลงตีพิมพ์ในวิทยาสารทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นถือเป็นลิขสิทธิ์เฉพาะของคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่น หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใด ๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษร จากคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นก่อนเท่านั้น
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