習慣性そしゃく側そしゃく時と非習慣性そしゃく側そしゃく時の舌運動と下顎運動動態の差異

Abstract

To elucidate the tongue movement in chewing with habitual chewing side chewing (HC) and non-habitual chewing side chewing (NHC), the chewing test was performed using eight healthy, fully dentate males. Tongue and mandibular movements with and without an experimental lingual plate (ELP) in chewing 3 grams of peanuts with HC and NHC were recorded and analyzed. Tongue movement of the ipsilateral and contralateral measuring points were recorded by ultrasound diagnostic equipment with 5 MHz electron convex section scanning probe, and mandibular movements of the incisal point were recorded by MKG. The masticatory efficiency was evaluated by the sieving method at that time.The results were as follows:1. The masticatory efficiency in NHC was lower than that of HC (p<0.01).2. The cycle time of tongue movement in NHC was longer than that of HC (p<0.01).3. The cycle time of mandibular movement in NHC was longer than that of HC (p<0.01).4. In HC and NHC, there was statistical correlation coefficient among masticatory efficiency, cycle time of tongue movement and cycle time of mandibular movement (p<0.01).From the result, it was suggested that analyzing tongue movement and mandibular movement is effective to determine the habitual chewing side in a patient. It was also suggested that the tongue acted harmoniously with the mandible in HC side chewing, but such cooperation was lacking in NHC.