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Effect of posterior impaction and setback of the maxilla on retropalatal airway and velopharyngeal dimensions after two-jaw surgery in skeletal Class III patients.
Angle Orthod. 2015 Jul; 85(4):625-30.AO

Abstract

OBJECTIVE

To evaluate the changes in retropalatal airway and velopharyngeal dimensions after posterior impaction (PI) only or PI and setback (PI/SB) of the maxilla in patients with skeletal Class III undergoing two-jaw surgery.

MATERIALS AND METHODS

Subjects consisted of 60 Class III patients treated with two-jaw surgery. They were divided into two groups: group 1 (n = 30; PI of the maxilla; mean = 2.6 mm) and group 2 (n = 30; PI/SB of the maxilla; mean = 2.8 mm and 1.8 mm, respectively). Using three dimensional computed tomography images taken 1month before surgery (T0) and at least 6 months after surgery (T1), retropalatal airway volume, minimum cross-sectional area, and lateral and anteroposterior (AP) dimensions of minimum cross-sectional area, soft palate angle, soft palate length, and pharyngeal depth were measured. A paired t-test and independent t-test were used for statistical analysis.

RESULTS

Group 1 showed increase in retropalatal airway volume and minimum cross-sectional area (P < .01 and P < .05, respectively). Group 2 exhibited decrease in retropalatal airway volume, minimum cross-sectional area, and lateral and AP dimensions of minimum cross-sectional area (all P < .01). Although groups 1 and 2 showed an increase in soft palate length (P < .01 and P < .001, respectively), pharyngeal depth significantly increased only in group 1 (P < .01). Groups 1 and 2 were significantly different in retropalatal airway volume, minimum cross-sectional area, and AP dimension (P < .05, P < .001, and P < .05, respectively).

CONCLUSION

Because the direction of surgical movement in the maxilla can determine the changes in the retropalatal airway and velopharyngeal dimensions, it is recommended that clinicians investigate whether patients suffer from sleep-related breathing disorders before performing PI/SB of the maxilla.

Authors+Show Affiliations

a Graduate student (PhD), Department of Oral and Maxillofacial Surgery, School of Dentistry, Seoul National University, Seoul, South Korea.b Professor, Department of Orthodontics, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, South Korea.c Professor, Department of Oral and Maxillofacial Surgery, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, South Korea.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

25297469

Citation

Kim, Taeyun, et al. "Effect of Posterior Impaction and Setback of the Maxilla On Retropalatal Airway and Velopharyngeal Dimensions After Two-jaw Surgery in Skeletal Class III Patients." The Angle Orthodontist, vol. 85, no. 4, 2015, pp. 625-30.
Kim T, Baek SH, Choi JY. Effect of posterior impaction and setback of the maxilla on retropalatal airway and velopharyngeal dimensions after two-jaw surgery in skeletal Class III patients. Angle Orthod. 2015;85(4):625-30.
Kim, T., Baek, S. H., & Choi, J. Y. (2015). Effect of posterior impaction and setback of the maxilla on retropalatal airway and velopharyngeal dimensions after two-jaw surgery in skeletal Class III patients. The Angle Orthodontist, 85(4), 625-30. https://doi.org/10.2319/041614-281.1
Kim T, Baek SH, Choi JY. Effect of Posterior Impaction and Setback of the Maxilla On Retropalatal Airway and Velopharyngeal Dimensions After Two-jaw Surgery in Skeletal Class III Patients. Angle Orthod. 2015;85(4):625-30. PubMed PMID: 25297469.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of posterior impaction and setback of the maxilla on retropalatal airway and velopharyngeal dimensions after two-jaw surgery in skeletal Class III patients. AU - Kim,Taeyun, AU - Baek,Seung-Hak, AU - Choi,Jin-Young, Y1 - 2014/10/09/ PY - 2014/10/10/entrez PY - 2014/10/10/pubmed PY - 2016/12/15/medline KW - Posterior impaction and/or setback of the maxilla KW - Retropalatal airway KW - Sleep-related breathing disorders KW - Velopharyngeal dimension SP - 625 EP - 30 JF - The Angle orthodontist JO - Angle Orthod VL - 85 IS - 4 N2 - OBJECTIVE: To evaluate the changes in retropalatal airway and velopharyngeal dimensions after posterior impaction (PI) only or PI and setback (PI/SB) of the maxilla in patients with skeletal Class III undergoing two-jaw surgery. MATERIALS AND METHODS: Subjects consisted of 60 Class III patients treated with two-jaw surgery. They were divided into two groups: group 1 (n = 30; PI of the maxilla; mean = 2.6 mm) and group 2 (n = 30; PI/SB of the maxilla; mean = 2.8 mm and 1.8 mm, respectively). Using three dimensional computed tomography images taken 1month before surgery (T0) and at least 6 months after surgery (T1), retropalatal airway volume, minimum cross-sectional area, and lateral and anteroposterior (AP) dimensions of minimum cross-sectional area, soft palate angle, soft palate length, and pharyngeal depth were measured. A paired t-test and independent t-test were used for statistical analysis. RESULTS: Group 1 showed increase in retropalatal airway volume and minimum cross-sectional area (P < .01 and P < .05, respectively). Group 2 exhibited decrease in retropalatal airway volume, minimum cross-sectional area, and lateral and AP dimensions of minimum cross-sectional area (all P < .01). Although groups 1 and 2 showed an increase in soft palate length (P < .01 and P < .001, respectively), pharyngeal depth significantly increased only in group 1 (P < .01). Groups 1 and 2 were significantly different in retropalatal airway volume, minimum cross-sectional area, and AP dimension (P < .05, P < .001, and P < .05, respectively). CONCLUSION: Because the direction of surgical movement in the maxilla can determine the changes in the retropalatal airway and velopharyngeal dimensions, it is recommended that clinicians investigate whether patients suffer from sleep-related breathing disorders before performing PI/SB of the maxilla. SN - 1945-7103 UR - https://www.unboundmedicine.com/medline/citation/25297469/Effect_of_posterior_impaction_and_setback_of_the_maxilla_on_retropalatal_airway_and_velopharyngeal_dimensions_after_two_jaw_surgery_in_skeletal_Class_III_patients_ L2 - https://meridian.allenpress.com/angle-orthodontist/article-lookup/doi/10.2319/041614-281.1 DB - PRIME DP - Unbound Medicine ER -