Abstract
The geometrical properties of toothbrushes play a role in developing abrasive tooth wear and non-carious cervical lesions. This study investigated the interplay between the toothbrush tuft arrangement (crossed vs. parallel) and bristle stiffness (soft vs. medium) on the abrasive dentin wear using three slurries with different levels of abrasivity (RDA: 67, 121 and 174). Twelve groups of bovine dentin samples (n = 20) were brushed with a combination of the aforementioned variables. Abrasive dentin wear was recorded with a profilometer and the resulting abrasive wear of each group was calculated and compared with each other using two-way ANOVA and pairwise tests. Toothbrushes with parallel tuft arrangement caused statistically significantly higher dentin wear compared to crossed tuft arrangement, regardless of the abrasivity level of the used slurry and the bristle stiffness. Soft crossed tuft toothbrushes caused statistically significantly higher abrasive dentin wear than medium crossed tuft toothbrushes, while soft and medium parallel tuft toothbrushes caused the same amounts of dentin wear, regardless of the RDA value of the used slurry. These results could be helpful for dentists and dental hygienists when advising patients. Crossed tuft toothbrushes could be a less-abrasive choice in comparison to parallel tuft toothbrushes.
Highlights
The geometrical properties of toothbrushes play a role in developing abrasive tooth wear and non-carious cervical lesions
Within the groups brushed with the 67-relative dentin abrasion (RDA) abrasive slurry, the median (IQR) abrasive dentin wear according to the properties was calculated as follows: Soft crossed = 4.85 μm (2.6), soft parallel = 8.50 μm (1.0), medium crossed = 4.40 μm (1.6) and medium parallel = 9.05 μm (1.1)
For groups brushed with the 121-RDA abrasive slurry, the median (IQR) abrasive dentin wear according to the properties was calculated as follows: Soft crossed = 6.20 μm (1.6), soft parallel = 15.75 μm (3.5), medium crossed = 4.75 μm (2.6) and medium parallel = 13.30 μm (3.5)
Summary
The geometrical properties of toothbrushes play a role in developing abrasive tooth wear and non-carious cervical lesions. This study investigated the interplay between the toothbrush tuft arrangement (crossed vs parallel) and bristle stiffness (soft vs medium) on the abrasive dentin wear using three slurries with different levels of abrasivity (RDA: 67, 121 and 174). Toothbrushes with parallel tuft arrangement caused statistically significantly higher dentin wear compared to crossed tuft arrangement, regardless of the abrasivity level of the used slurry and the bristle stiffness. It is well known that toothbrushing removes dental plaque, but could remove parts of the sound tooth hard tissue (abrasive enamel or dentin wear)[4] This abrasive wear was classified as an important factor in the development of non-carious cervical lesions (NCCL) in many s tudies[5,6,7,8,9,10]. This study was conducted to investigate the effect of two different tuft designs (parallel vs. crossed) and two different bristle stiffness (soft vs. medium) on the abrasive dentin wear using three abrasive slurries with different relative dentin abrasion (RDA) values (67, 121 and 174)
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