Abstract
Objectives: This study was to evaluate effectiveness of dental plaque removal by head types of interdental brush. Methods: Artificial dental plaque was sprayed over the proximal area of extracted premolar and molar tooth fixed to reciprocating abrasion test instrument(THK L.S 20100, Tokyo, Japan). After teeth brushed, the removed dental plaque area was taken by a digital camera and its' photographs were sorted and measured by Image Program System(Image-proR Version 4.5.1 for WindowTM. USA). The measurement was classified by head types, horizontal interdental distance, brushing speed and interdental brushing stroke respectively. Results: The average of dental plaque removal of all interdental brushes was 25.9%. Cylindrical head type showed 22.4% and tapered marked 29.5% (p < 0.01). Removal rate of dental plaque by horizontal interdental distance was 30.2% at 2 mm, 26.9% at 3 mm and 21.4% at 4 mm(p < 0.01). Removal rates according to brushing speed showed 25.6% at 0.5 stroke/sec, 26.4% at I stroke/sec and 25.9% at 2 stroke/sec (p > 0.05). According to interdental brushing stroke, removal rates of dental plaque marked 24.2% at 3 times, 25.7% at 5 times, 27.4% at 7 times and 28.2% at 10 times(p < 0.01). The most important factor influencing the removal of dental plaque was head type. Positive correlation was shown between head type and interdental brushing stroke, while negative was shown horizontal interdental distance. Conclusion: It was considered necessary to establish the standardization of interdental brush on the market for the oral health care in Korea.