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Related Experiment Video

Updated: May 1, 2026

Pilot In Vitro Study to Assess Cleaning Ability and Effects of Different Decontamination Methods on Implant Surfaces

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Published on: November 21, 2025

Toothbrush efficacy for plaque removal.

K J Nightingale¹, S K Chinta, P Agarwal

¹NYU Bluestone Center for Clinical Research, College of Dentistry, New York, NY, USA.

International Journal of Dental Hygiene

|April 18, 2014

Summary

This summary is machine-generated.

The Panasonic EW-DL90 sonic toothbrush significantly reduces plaque compared to manual brushing. While it improved gingival inflammation initially, both brushes showed similar results after three weeks.

Keywords:

dental plaque flossing gingivitis toothbrush

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Area of Science:

Dental hygiene research
Oral health technology evaluation

Background:

Plaque accumulation and gingival inflammation are key indicators of oral health.
Manual toothbrushes are the standard for daily oral hygiene.
Novel electric toothbrush technologies aim to improve plaque removal and gingival health.

Purpose of the Study:

To compare the plaque-reducing efficacy of the Panasonic EW-DL90 sonic toothbrush against a manual toothbrush.
To assess the impact of the sonic toothbrush on maintaining gingival health over time.

Main Methods:

A block-randomized, examiner-blind, parallel-group clinical study.
84 participants were assigned to either the Panasonic EW-DL90 or a manual toothbrush group.
Plaque levels and gingival bleeding were measured at baseline, 1 week, and 3 weeks.

Main Results:

The EW-DL90 group demonstrated significantly lower plaque levels at both 1 and 3 weeks (P = 0.003, P = 0.0035).
Gingival inflammation scores were significantly lower in the EW-DL90 group after 1 week (P = 0.0293).
No significant difference in gingival bleeding scores was observed between groups after 3 weeks.

Conclusions:

The Panasonic EW-DL90 sonic toothbrush is more effective at plaque removal than a manual toothbrush.
Initial improvements in gingival inflammation were noted with the sonic brush.
Long-term gingival health maintenance showed no significant difference between the sonic and manual toothbrushes after 3 weeks.