2000 Volume 20 Issue 2 Pages 241-251
The purpose of this study was to grasp the substance of the effects of treatment with maxillary protraction and their changes in a term of six months to two years after treatment of patients with crossbite caused by an undergrowth of the nasomaxillary complex.
The objects of this study are seven unilateral cleft lip and palate patients treated with maxillary protraction by the same orthodontist in the Orthodontic Department of Showa University Dental Hospital.
The following three conclusions were reached after the analyses of lateral cephalograms of these patients before, immediately after, and during a term of six months to two years after treatment.
1. The improvement of the crossbite with this approach shows changes in the advancement of the nasomaxillary complex, in the clockwise rotation of the mandible and labial inclination of the upper alveolar segment, and in the counterclockwise rotation of the palatal plane.
2. Four of seven cases had reoccurring crossbite during an observations after treatment that was caused by a lingual inclination of the upper incisors and a counterclockwise rotation of the mandible.
3. It was shown that the maxillary protraction for a patient with a cleft palate during the deciduous dentition was effective in the improvement of skeletal and occlusal unbalance with more or less amounts of relapse.
