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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Class II correction improves nocturnal breathing in adolescents

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Author(s):
Barros Schuetza, Teresa Cristina [1] ; Dominguez, Gladys Cristina [2] ; Hallinan, Marcia Pradella [1] ; Abrahao Cunha, Thays Crosara [1] ; Tufik, Sergio [1]
Total Authors: 5
Affiliation:
[1] Univ Fed Sao Paulo, Dept Psychobiol, BR-04024002 Sao Paulo - Brazil
[2] Univ Fed Sao Paulo, Dept Orthodont, BR-04024002 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: ANGLE ORTHODONTIST; v. 81, n. 2, p. 222-228, MAR 2011.
Web of Science Citations: 29
Abstract

Objective: To examine modifications in sleep pattern and in craniofacial morphology of adolescents with mandibular retrognathism. Materials and Methods: Sixteen subjects at maximum pubertal growth (12.6 years {[}+/- 11.5 months]) were selected and treated for 12 months with maxillary expansion and mandibular advancement with a Herbst appliance. Cephalometric radiography and magnetic resonance imaging were obtained prior to and after treatment and were compared using the paired Student's t-test or the nonparametric Wilcoxon rank-sum test. Four polysomnographic recordings were obtained with pressurized nasal cannulae and were analyzed by analysis of variance. Results: The length of the mandible was increased, while the antero-posterior position of the maxilla remained stable. The posterior airway space was increased, the length of the tongue was preserved, and the hyoid bone was moved to a more anterior position. After Herbst treatment, sleep efficiency, sleep latency, rapid eye movement (REM) sleep latency, and percentage of REM sleep remained stable. We did observe a reduction (P < .05) in the relative proportions of stage 1 and stage 3-4 (from 4.30 +/- 1.99 to 2.61 +/- 1.83 for stage 1 and from 25.78 +/-. 7.00 to 19.17 +/- 7.58 for stages 3-4) as well as an increase (P < .01) in the percentage of stage 2 after treatment (49.03 +/- 6.25 to 56.90 +/- 6.22). There was a reduction (P < .05) in the number of respiratory effort related arousals (7.06 +/- 5.37 to 1.31 +/- 1.45 per hour of sleep) due to an increase (P < .01) in airway volume. Conclusions: In the short term, the increase in airway space improved nocturnal breathing associated with the correction of mandibular retrognathism. (Angle Orthod. 2011;81:222-228.) (AU)

FAPESP's process: 98/14303-3 - Center for Sleep Studies
Grantee:Sergio Tufik
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC