Study Of Perioral Muscle Pressure With Tongue Thrust

Perioral muscle pressure is a kind of force acting on dental arch from surrounding soft tissues, such as lip, cheek, tongue, and muscles. The researches on the effects of this force regarding to dental and their mechanisms are one of the most important fields in stomatology. Swallowing function is highly related to dentofacial system. The abnormality of swallowing function may result in many dental problems. Tongue thrust frequently occurs in children. Many clinical observations revealed that it might lead to malocclusion, maxilla, mandibular protrusion, or diastema of teeth. But the causes remain to be studied, and further clinical studies are needed.hi this paper, a computer aided perioral muscle pressure measurement device newly developed by the Stomatology College of Fourth Military Medical University was used to measure perioral muscle pressure and its variation resulted from tongue thrust at rest and during swallowing. These data were compared with perioral muscle pressure in normal swallowing condition, and the correlations of perioral muscle pressure with tongue thrust were analyzed. The results suggested the abnormal perioral muscle pressure resulted from tongue thrust might be a major factor for malocclusion. Based on the experimental results, several potential clinical strategies to treat tongue thrust-related malocclusion were discussed, and a procedure was proposed for treating patients.The study consisted of two parts as following:hi the first part, the study of perioral muscle pressure between tongue thrust and normal swallowing were studied among 72 patients who were 36boys and 36 girls aged 8-16 years. Pressures acting on upper and lower first molars, cuspids, central incisors were measured buccally and lingually. The results are:l.At rest, the perioral muscle pressures exerted on the labial side of the mandibular central incisors were higher than those of maxillary central incisors. In normal swallowing patients there were no difference for the tongue pressure between maxillary central incisors and mandibular incisors. But patients with tongue thrust of tongue pressure in mandibular central incisors were higher than those of maxillary incisors. In normal swallowing patients, cheek pressures of the molar maxillary were higher than those of tongue pressure. But there were no difference in the mandible. In the tongue thrust patients, tongue pressures were higher than cheek pressures in upper and lower molar areas.2.On swallowing, tongue pressures in the central incisor of mandible were higher than those of central incisor of maxilla. Tongue pressures were higher than cheek pressures in the upper and lower molars areas. Perioral muscle pressures of tongue thrust were higher than those of normal swallowing patients. This is one of important factors leading to maxilla, mandibular protrusion, or diastema of teeth and open bite. The conclusions are:Perioral muscle pressures of tongue thrust were higher than those of normal swallowing patients.lt is suggested that tongue thrust probably causes stronger tongue pressure. Tongue thrust cause changes of perioral muscle pressure. The perioral muscle pressures were adaptive to the changed function. It might lead to malocclusion.In the second part, perioral muscle pressure between anterior open bite with tongue thrust and normal occlusions with normal swallowing people were studied. Twenty-four patients were selected. Pressures acting on upper and lower central incisors were measured buccally and lingually. The results are:1. At the rest position, the tongue pressures of the patients with open bitewere all higher than those of people with normal occlusion and swallowing in their upper and lower central incisor areas. There were no difference between upper labial pressure and lower labial pressure in the patients with open bite. The upper and lower tongue pressures were higher than labial pressures. In normal occlusions and swallowings people, the lower labial pressures were higher than those of the upper labial pres...