交叉咬合症例に対する上顎歯列弓拡大が上下顎歯列弓および下顔面に及ぼす影響について

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There is no evidence that the problem of crossbite will be improved without treatment. The crossbite at the molar area is not easy to detect by the patient himself, so treatment had been neglected. Furthermore, it is very hard to effect excellent treatment of this abnormality. In orthodontics, the method of treatment for crossbite is bilateral expansion of the upper dental arch. There have been many articles published concerning this treatment, but the relationship of upper and lower dentitions due to the treatment, its relation to face or occlusal plane and their relapse tendency still are unknown. To date, few reports on these relationships have been presented. This study was conducted to examine the difference and effects of screw expansion appliances and lingual arch type appliances on upper and lower arches by gnathostatic model measurements and its reference to the face, in juvenile orthodontic patients. Thirteen subjects (8 girls and 5 boys) each exhibiting at least a unilateral posterior lingual crossbite, who had been treated by the screw expansion appliances in our orthodontic department were selected for this study. Gnathostatic models, wax bites, and oriented photograms were taken at the begining of treatment, when the appliances were removed, and at retention and then measured. The follwing results were gained and noted. 1. In the cases of screw expansion appliances, the quality of expansion was the same between the canine area and the molar area. Both expansion measurements were almost equal. 2. In the cases of lingual arch type appliances, the quality of expansion at the canine area was smaller than the molar area. 3. Relapse tendencies which were treated by screw expansion appliances were smaller than those treated by lingual arch type appliances. 4. The differences of lower arch width that related to upper jaw expansion among pretreatment, posttreatment and after retention were not significant. 5. The direction of deviation of mandible was related to that of the lower face. That is, both were in the same direction of deviation. 6. The inclination of occlusal plane before treatment, in the right side crossbite cases, was upper inclined from the left side to the right, and in the left side crossbite cases were reversed. However, during posttreatment and after retention, the regularity was lost completely.
九州歯科学会の論文
1983-02-25

交叉咬合症例に対する上顎歯列弓拡大が上下顎歯列弓および下顔面に及ぼす影響について

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