Soft tissue profile changes after vertical ramus osteotomy
Identifieur interne : 006133 ( Main/Exploration ); précédent : 006132; suivant : 006134Soft tissue profile changes after vertical ramus osteotomy
Auteurs : Julia Naoumova ; Björn Söderfeldt [Suède] ; Rolf LindmanSource :
- The European Journal of Orthodontics [ 0141-5387 ] ; 2008-06-03.
Abstract
Patients with mandibular prognathism have, for a number of years, been treated by orthognathic surgery and post-surgical changes in the facial profile have been widely reported. However, little is known about the influence of gender and age on the soft tissues. The aim of this study was to investigate changes in the soft tissue profile following orthognathic surgery and to evaluate gender and age differences in the ratios of soft-to-hard tissue change. Forty-two Caucasian adults (18 males and 24 females) aged from 17 to 46 years with mandibular prognathism who underwent vertical ramus osteotomy were included. Lateral cephalograms were taken 2–8 months pre- (T1) and 12–19 months post- (T2) surgically. Five skeletal, two dental, and seven soft tissue parameters were hand traced. Paired and unpaired Student's t-tests, Pearson's correlation coefficients, and multiple regression analyses were used to evaluate the data. Due to the setback of the mandible, soft and hard tissues changed in a 1:1 ratio at the mentolabial fold and chin in females and 1:1,1 in males. Significant differences of soft-to-hard tissue ratios were found at points Pg (P < 0.05) and Gn (P < 0.01). Age effects on the ratios were not significant. Other effects of the mandibular setback on the soft tissue profile were a significant increase in facial convexity, a deepening of the mentolabial fold, an increase in lower lip thickness, and a decrease in upper lip thickness, which increased the nasolabial angle. These findings indicate that use of gender-specific ratios in treatment planning might improve the accuracy of predicting treatment results.
Url:
DOI: 10.1093/ejo/cjn025
Affiliations:
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However, little is known about the influence of gender and age on the soft tissues. The aim of this study was to investigate changes in the soft tissue profile following orthognathic surgery and to evaluate gender and age differences in the ratios of soft-to-hard tissue change. Forty-two Caucasian adults (18 males and 24 females) aged from 17 to 46 years with mandibular prognathism who underwent vertical ramus osteotomy were included. Lateral cephalograms were taken 2–8 months pre- (T1) and 12–19 months post- (T2) surgically. Five skeletal, two dental, and seven soft tissue parameters were hand traced. Paired and unpaired Student's t-tests, Pearson's correlation coefficients, and multiple regression analyses were used to evaluate the data. Due to the setback of the mandible, soft and hard tissues changed in a 1:1 ratio at the mentolabial fold and chin in females and 1:1,1 in males. Significant differences of soft-to-hard tissue ratios were found at points Pg (P < 0.05) and Gn (P < 0.01). Age effects on the ratios were not significant. Other effects of the mandibular setback on the soft tissue profile were a significant increase in facial convexity, a deepening of the mentolabial fold, an increase in lower lip thickness, and a decrease in upper lip thickness, which increased the nasolabial angle. These findings indicate that use of gender-specific ratios in treatment planning might improve the accuracy of predicting treatment results.</div></front></TEI><affiliations><list><country><li>Suède</li></country></list><tree><noCountry><name sortKey="Lindman, Rolf" sort="Lindman, Rolf" uniqKey="Lindman R" first="Rolf" last="Lindman">Rolf Lindman</name><name sortKey="Naoumova, Julia" sort="Naoumova, Julia" uniqKey="Naoumova J" first="Julia" last="Naoumova">Julia Naoumova</name></noCountry><country name="Suède"><noRegion><name sortKey="Soderfeldt, Bjorn" sort="Soderfeldt, Bjorn" uniqKey="Soderfeldt B" first="Björn" last="Söderfeldt">Björn Söderfeldt</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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