No abstract available.
Adult* ; Humans

Intraoral Vertical Ramus Osteotomy(IVRO) is a typical osteotomy procedure to setback the mandible for the prognathic patients and has many advantages functionally and morphologically, however, available data to predict the progressive prognosis on the functional rehabilitation of the mandible and the morphological change of the rami of the mandible after IVRO has been less reported. This is a prospective study for the progressive changes on the functional rehabilitation and the morphology of the rami of the mandible after IVRO for the Korean Prognathisms. 38 patients were studied for the functional rehabilitation and 21 patients were for the morphological change. Maxillo-Mandibular Fixation(MMF) was maintained for two weeks after IVRO and active physiotherapy was applied by means of Park's Protocol for next two weeks. Progressive change of the range of motion after release of MMF at maximum mouth opening, protrusion, lateral excursion(right and left) was recorded daily for 15days, and also recorded at 1st, 3rd, 6th, 12th, 18th months on the flow charts in the group for functional rehabilitation study. Nine measurements were measured to check morphological changes of the rami of the mandible at Immediate, 1, 3, 6 and 12 months postoperative period on Panex, P-A and Lateral Cephalometrics. The results were obtained as followings : 1. Mandibular function was returned rapidly during early 5 days after release of MMF, and reached to the almost normal range within 15days. And then slowly and progressively increased more and more afterward. 2. Recovery rate of the mandibular function after IVRO was depended upon the forcible application of a well-oriented protocol for active physiotherapy during early stage(within 15 days) after release of MMF. 3. Evidences of cortex-to-cortex healing between proximal and distal segments of the Mandible(CNS, CA, DOA on Panex) were definitely observed. They were changed slowly from immediate to 3 months but changed remarkably from 3 to 6 months of postoperative period, and then showed continuous but very slow changes afterward. 4. Vertical lengths of the proximal segments(RL, LL) were reduced remarkably from immediate to 3 month of postoperative period, and more slowly reduced from 3 to 6th month period, and then constantly reduced afterward as mimic rate. 5. Transverse distance between proximal segments(TL) was reduced rapidly within one month postoperatively and showed more slow and stable changes until one year follow-up period. 6. The gap between proximal and distal segments was disappeared rapidly within 6 month postoperatively, and then reduced very slowly afterward. 7. The change of Gonial angle(GA) was rapidly increased within one month of postoperative period and then increased very slowly afterward. In summary, mandibular function was returned to almost normal within two weeks after release of MMF, and osseous union was completely established between the proximal and distal segments without any complications in spite of early functional movement of the mandible without fixation between fragments. Morphological changes on the rami of the mandible was remarkable within 3 month period of postoperative and then continuously remodeled until one-year follow-up period. The application of a forcible and well-oriented protocol of active physiotherapy immediate after release of MMF may be the most important factor for prognosis of rehabilitation and morphological changes in IVRO.
Follow-Up Studies ; Humans ; Mandible ; Mouth ; Osteotomy* ; Postoperative Period ; Prognathism* ; Prognosis* ; Prospective Studies ; Range of Motion, Articular ; Reference Values ; Rehabilitation

No abstract available.

No abstract available.

No abstract available.
Orthognathic Surgery*

IVRO is a popular procedure to setback prognathic mandible. But guided functional physiotherapy after IVRO is the most important factor to get successful result, because there have been some concerns over an openbite tendency following this procedure. The purpose of this study is to evaluate the early adaptability to fuctional phsiotherapy and early openbite tendency associated with the kinds of surgery performed. The study was performed in fifty patients who had received bilateral IVRO from 1993 to 1994. After two weeks of maxillomandibular fixation(MMF), active physiotherapy was carried out according to Park's protocol and detail of openbite tendency was checked. We recorded the number of days for physiotherapy to analzye the adaptability in early physiotherapy until there was no more openbite tendency. The following results were obtained. 1. The adaptability in early physiotherapy to prevent openbite tendency following IVRO was more favorable in two-jaw surgery group than one-jaw surgery group.(p<0.005) 2. The adaptability in early physiotherapy was more favorable in lesser mandibular setback group than larger setback group, but there was no statistical significance. (p<0.05). 3. The adaptability in early physiotherapy was more favorable in posterior impaction group than non-posterior impaction group, but there was no statistical significance.(p<0.05). 4. The cases which MMF was applied again because of the strong openbite tendency were more plentiful in one-jaw surgery group than in two-jaw surgery group. 5. First two or three days after releasing of maxillomandibular fixation might be the critical period to prevent anterior openbite tendency, and if the partient shows strong openbite tendency during this period, 4-5 days of reapplication of MMF was enough to prevent openbite tendency .
Critical Period (Psychology) ; Humans ; Jaw Fixation Techniques ; Mandible ; Open Bite* ; Prognathism*

No abstract available.
Jaw*

No abstract available.
Jaw*

No abstract available.
Molar, Third* ; Paresthesia* ; Prospective Studies*

No abstract available.
Molar, Third* ; Paresthesia* ; Prospective Studies*