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KMID : 0360119920140030217
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Journal of the Korean Society of Maxillofacial Plastic Reconstructive Surgeons
1992 Volume.14 No. 3 p.217 ~ p.227
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Change of lateral soft tissue profile after surgical correction ofmandibular prognathism
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Abstract
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The purpose of this paper is to investigate changes in soft tissue in 22 patients treated by vertical ramus osteotomy and sagittal split ramus osteotomy for the correction of mandibular prognathism.
22 individuals, 12 males and 10 females, were selected from the pateints with mandibular prognathism at the Department of Oral and Maxillofacial Surgery, Colledge of Dentistry, Kyung Hee University.
Patient were analyzed with cephalogram taken 1 week before and at least 6 weeks after surgery under the same condition.
Measurements were made constructed hard tissue and soft tissue points located on each before-andafter film tracing.
Comparision were made of these figures to estimate the amount that the soft tissue followed the hard tissue structures in each surgical procedure : ratio of soft and hard tissue changes wer eformulated.
@ES The results were as follows.
@EN 1. The horizontal changes of Pogs and Bs as a ratio of the horizontal changes of Pog and B point were 1.02 and 1.16 respectively.
2. On emillimeter of posterior changes at Pog resulted in 0.86mm of posterior change at Li and 0.09mm of posterior change at Ls.
The greatest amount of soft tissue change occurred at Pogs, with substantially less posterior displacement at Bs, even less at Li and at least at Ls.
3. The ratio of LI to Li was 1:0.81 and the ratio of LI to Ls was not significant. (1:0.17)
4. The ULA (Cm-Sn-Ls) and the relative lower lip projection (LLP) was increased,but the relative upper lip projection (ULP) was slightly decreased.
5. The angular change of the upper lip inclined angle (Ls-Sn/ANS-PNS) and lower lip inclined angle (Li-Pogs/Me-Go) expressed as a ratio of the posterior change of Pog were 0.57 and 0.20 respectively.
6. The ratio of the lower anterior facial height change of soft tissue (Sn-Mes) to the hard tissue (ANSGn) were 0.78 and and the ratio of vertical height changes of the hard tissue and soft tissue to the posterior change of the Pog were 0.18 and
0.19
respectively.
7. The soft tissue angular change of facial convexity (G-Sn-Pogs) expressed as a ratio of the angular change of the hard tissue angle of facial convexity (N-A-Pog) was 1.24.
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