03 July 2023

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Toothbrushing using a 3D motion-tracked system

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Aims

To assess the efficacy of a smart toothbrush and mirror (STM) system which provided computer-assisted toothbrushing instruction versus conventional verbal toothbrushing instruction (TBI) amongst a group of 6–12-year-old children.

Design

This randomized controlled trial comprised South Korean school children who were randomly allocated to one of two arms - the STM (n = 21) or the conventional TBI arm (n = 21). The STM system used identical brushes as the TBI group, but with the brush employing three-dimensional motion tracking systems alongside a mirror with an inbuilt computer to guide the user. Modified Quigley-Hein plaque indexes were taken at baseline, immediately after STM/TBI, and then at 1 week and 1 month.

Results

Overall, there was a statistically significant reduction in the average whole-mouth plaque scores for both groups, 40.50% and 40.57% for the STM group and TBI group respectively. There was no statistical significance that either arm was more effective in reducing plaque scores than the other. Both groups demonstrated time to be a statistically significant factor in reducing plaque indices.

Conclusion

There is no conclusive evidence that the STM system offers any benefits in terms of plaque control over conventional TBI in this study.

Fletcher, R., Linden, J. "Mirror, mirror on the wall—is toothbrushing instruction via a three-dimensional motion-tracked system the fairest of them all?" Evid Based Dent 24, 89–90 (2023). https://doi.org/10.1038/s41432-023-00895-3.