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KMID : 0355420230470040160
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Journal of Korean Academy of Oral Health
2023 Volume.47 No. 4 p.160 ~ p.166
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Evaluation of toothpaste abrasivity using acrylic and spectrophotometry
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Jeong Seung-Hwa
Byon Min-Ji
Jun Eun-Joo
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Abstract
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Objectives: This study aimed to develop a method for objectively evaluating toothpaste abrasivity, enabling a direct comparison between different toothpastes.
Methods: Nine commercially available toothpaste variants were selected, and 8 mm thick acrylic specimens were allocated to each toothpaste treatment group (n=7). A control group withouttoothpaste was also included. Specimens and toothbrushes were mounted on the V8 Cross brushing machine, and toothpaste (0.05-0.1 g) was applied for 20 strokes under a 200 g load and 1 Hzspeed. The surface wear was measured at an absorbance of 600 nm in a UV-Vis spectrophotometer. Specimens were then photographed with a polarized light microscope, and the gray value ofthe worn brushed part was obtained through image analysis using Image J software. A one-way ANOVA followed by Bonferroni’s post-hoc test was employed for analyzing absorbance and grayvalue differences among the toothpaste groups. The correlation between absorbance and gray value was assessed using Pearson’s correlation analysis.
Results: Significant differences were noted in absorbance and gray values across the toothpaste groups (P<0.05), and a strong correlation was observed between the absorbance and the valuesfrom the images analyzed (r=0.948, P<0.001). The wear rankings based on absorbance and image analysis values were mostly the same.
Conclusions: This study introduces a direct and objective method for evaluating toothpaste abrasion, offering users objective information on different toothpaste types.
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KEYWORD
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Acryl, Polarized light microscopy, Spectrophotometer, Toothbrushing, Toothpaste abrasivit
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