Fig. 2

Interdental model of plastic teeth with mounted discs. The resin composite discs are separated from the reach of the toothbrush bristles by 2 mm. The plastic teeth are positioned such that brushing is applied to the buccal surface (a). Inset: The discs are held perpendicular to the plane of the brushing action, the gap mimicking the embrasure. The approximate position of the toothbrush is shown in (b). Oral devices are positioned perpendicularly to the fixed specimens, as illustrated in (c) for the sonic toothbrush. A gap was provided to ensure that the tip of the toothbrush did not hit the tooth, and the position of the electric toothbrush was set