The purpose of this study was to evaluate the result after 2-phase surgical-orthodontic treatment without preoperative orthodontic treatment for the skeletal CI Ⅲ malocclusion patient and to obtain an adequate protocol on the bases of this
result.
This retrospective study of ten patients who underwent 2-phase treatment were done to evaluate 1) the surgical stability and relapse pattern 2) the facial esthetics 3) the TMJ problem 4) the total time of the treatment.
Results were followed :
1) The horizontal relapse of the mandible was 26.8% and didn't show significant differences compared to the convensional 3-phase treatment. But, it was considered that this amount of relapse was the sum of true relapse and autoratation of
mandible
due
to decreased vertical dimension during orthodontic treatment.
2) It was estimated that there's no difference on the ratio of anterior facial height between the subjects and the normal patients.
On the horizontal analysis, the mandible of the subjects was located more anteriorly than that of the normal patients.
This result showed that there was a need for the accurate preoperative esthetic evaluation and the additional methods for reducing the relapse due to the occlusal interference.
3) Wide variation was noted on the TMJ symptoms of the subjects, however, it was estimated that there's no significant differences of symptoms compared to that of the conventional 3-phase treatment on literatures.
4) The average of the overall period of treatment was 20.8 months and we obtained reduction of the treatment time compaired to 3-phase treatment on many literatures.
Most of the results of this study were similar to the findings of the 3-phase
treatment(preoperative orthodontic-orthognathic surgery-postoperative orthodontic), but
total time of the treatment was shorter in patients with 2-phase treatment than in
those with the conventional 3-phase treatment. With 2-phase treatment, we experienced many advantages compared to the conventional method considering that it was favarable conditions for the teeth, it had the flexibility ofr the treatment, and it
could
be the adequate treatment approach for the stomatognathic system.
Although this retrospective pilot study had some limitations, due to small samples, the authors would hope that it could serve as a guide for the future reaearthes, and teh clinical applications.
|