Surgical-orthodontic treatment is performed for the skeletal Class Ill patients with no remaining growth and too big a skeletal discrepancy for camouflage treatment, and two jaw surgery is needed in order to have maximum effect in such patients. In two jaw surgery cases, surgical alteration of the occlusal plane is necessary to establish optimal function, esthetics and postoperative sabihty, therefore the establishment of the ocdusal plane is essential in diagnosis and treatment.
The object of this study is to evaluate the stability of the indiviual ideal occlusal plane bsaed on the architectural and structural craniofacial analysis of Delaires. Thus, the subjects of this study were 48 patients who underwent two jaw surgery, and divided in two groups. Each group were composed of 24patients, A group were operated with ideal occlusal plane and B group were not Two groups were compared at the preoperative, immediate postoperative (average 4.3davs), and long-term postoperative (average 1.3years) lateral cephalometric radiographs.
The following results wen obtained:
1. There was no significance in occlusal plane angulation between T2 and Ts. Average long term follow-up changes
of occlusal plane angle were 11.24°±2.43, with FH plane and O.15°±2.16° with SIN plane in all 48 patients. These
results demonstrated that the occlusal plane after two jaw surgery in skeletal Class III malocclusion was stable. 2. There was no significance in postoperative stability of occlusal plane between A and B group.
3. There was no significance in postoperative stability of occlusal plane depending on surgeon and operative
method within each group.
4. The postoperative changes of occlusal plane were. correlated to the postoperative changes of jaw rather than tooth position.
5. There was no correlation between the postoperative changes of occlusal plane and maxillary impaction and mandibular setback with surgery.
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