Evaluation of toothpaste abrasivity using acrylic and spectrophotometry
10.11149/jkaoh.2023.47.4.160
- Author:
Seung-Hwa JEONG
1
;
Min-Ji BYON
;
Eun-Joo JUN
Author Information
1. Department of Preventive & Community Dentistry, School of Dentistry, Pusan National University, Yangsan, Korea
- Publication Type:Original Article
- From:Journal of Korean Academy of Oral Health
2023;47(4):160-166
- CountryRepublic of Korea
- Language:English
-
Abstract:
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 without toothpaste 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 Hz speed. 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 of the 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 gray value 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 values from 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.
