This study was made of the strain of gingiva on physiological property of free gingival surface according to the Pias 49 Water Pik.
The dog was subject to this experiment and the strain gauge M-101 (Shinkoh Co.) was adhered to the free gingival surface of maxillary cuspid with alpha cyano acrylate and parallel to the long axis of tooth. The tip of the handpiece was 10mm at the distance and the directions were in vertical and forty five degree against the gingival surface. The strain of gingival caused by stream of water pressure on each dial number setting on the Water Pik were record.
As the result, the free gingival surface was subject to a tensile strain on each dial number of the Water Pik. The degree of strain were determined by the force of water pressure but this trend appeare more clearly on the dial number three. In the direction of forty five degree the spike of gingival strain showed more than in the vertical direction.
