The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Immediate effects of mandibular posterior displacement on the pharyngeal airway space: A preliminary study

  • Choi, Yeonju (Department of Orthodontics, Pusan National University Dental Hospital, Dental Research Institute) ;
  • Kim, Yong-Il (Department of Orthodontics, Pusan National University Dental Hospital, Dental Research Institute) ;
  • Kim, Seong-Sik (Department of Orthodontics, Pusan National University Dental Hospital, Dental Research Institute) ;
  • Park, Soo-Byung (Department of Orthodontics, Pusan National University Dental Hospital, Dental Research Institute) ;
  • Son, Woo-Sung (Department of Orthodontics, Pusan National University Dental Hospital, Dental Research Institute) ;
  • Kim, Sung-Hun (Department of Orthodontics, Pusan National University Dental Hospital, Dental Research Institute)
  • Received : 2019.08.09
  • Accepted : 2019.12.23
  • Published : 2020.03.25
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Abstract

Objective: This study aimed to evaluate the immediate effects of mandibular posterior displacement on the pharyngeal airway space (PAS) by using cephalometric evaluations and to investigate how the surrounding structures are schematically involved. Methods: In this retrospective study, 38 subjects with functional Class III malocclusion and two lateral cephalograms were selected. The first lateral cephalogram was taken with the mandible in the habitual occlusal position, and the second in anterior edge-to-edge bite. Paired t-test was used to analyze changes in the PAS, hyoid bone, tongue, and soft palate, followed by mandibular posterior displacement. Pearson's correlation analysis was used to determine the relationship between the amount of mandibular posterior displacement and other variables. Results: A statistically significant decrease was observed in the PAS following mandibular posterior displacement. Along with mandibular posterior displacement, the tongue decreased in length (p < 0.001) and increased in height (p < 0.05), while the soft palate increased in length, decreased in thickness, and was posteriorly displaced (p < 0.001). The hyoid bone was also posteriorly displaced (p < 0.05). There was no correlation between the amount of mandibular posterior displacement and the measured variables. Conclusions: The PAS showed a statistically significant decrease following mandibular posterior displacement, which was a consequence of retraction of the surrounding structures. However, there were individual variances between the amount of mandibular posterior displacement and the measured variables.

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References

  1. Donner MW, Bosma JF, Robertson DL. Anatomy and physiology of the pharynx. Gastrointest Radiol 1985;10:196-212.
  2. El H, Palomo JM. Airway volume for different dentofacial skeletal patterns. Am J Orthod Dentofacial Orthop 2011;139:e511-21. https://doi.org/10.1016/j.ajodo.2011.02.015
  3. McNamara JA. Influence of respiratory pattern on craniofacial growth. Angle Orthod 1981;51:269-300.
  4. Dayyat E, Kheirandish-Gozal L, Sans Capdevila O, Maarafeya MMA, Gozal D. Obstructive sleep apnea in children: relative contributions of body mass index and adenotonsillar hypertrophy. Chest 2009;136:137-44. https://doi.org/10.1378/chest.08-2568
  5. Achilleos S, Krogstad O, Lyberg T. Surgical mandibular advancement and changes in uvuloglossopharyngeal morphology and head posture: a shortand long-term cephalometric study in males. Eur J Orthod 2000;22:367-81. https://doi.org/10.1093/ejo/22.4.367
  6. Irani SK, Oliver DR, Movahed R, Kim YI, Thiesen G, Kim KB. Pharyngeal airway evaluation after isolated mandibular setback surgery using cone-beam computed tomography. Am J Orthod Dentofacial Orthop 2018;153:46-53. https://doi.org/10.1016/j.ajodo.2017.05.031
  7. Han S, Choi YJ, Chung CJ, Kim JY, Kim KH. Longterm pharyngeal airway changes after bionator treatment in adolescents with skeletal Class II malocclusions. Korean J Orthod 2014;44:13-9. https://doi.org/10.4041/kjod.2014.44.1.13
  8. Cohen J. A power primer. Psychol Bull 1992;112:155-9. https://doi.org/10.1037/0033-2909.112.1.155
  9. Jeans WD, Fernando DC, Maw AR, Leighton BC. A longitudinal study of the growth of the nasopharynx and its contents in normal children. Br J Radiol 1981;54:117-21. https://doi.org/10.1259/0007-1285-54-638-117
  10. Athanasiou AE, Toutountzakis N, Mavreas D, Ritzau M, Wenzel A. Alterations of hyoid bone position and pharyngeal depth and their relationship after surgical correction of mandibular prognathism. Am J Orthod Dentofacial Orthop 1991;100:259-65. https://doi.org/10.1016/0889-5406(91)70063-3
  11. Panou E, Motro M, Ates M, Acar A, Erverdi N. Dimensional changes of maxillary sinuses and pharyngeal airway in Class III patients undergoing bimaxillary orthognathic surgery. Angle Orthod 2013;83:824-31. https://doi.org/10.2319/100212-777.1
  12. Lamont J, Baldwin DR, Hay KD, Veale AG. Effect of two types of mandibular advancement splints on snoring and obstructive sleep apnoea. Eur J Orthod 1998;20:293-7. https://doi.org/10.1093/ejo/20.3.293
  13. Ferguson KA, Ono T, Lowe AA, al-Majed S, Love LL, Fleetham JA. A short-term controlled trial of an adjustable oral appliance for the treatment of mild to moderate obstructive sleep apnoea. Thorax 1997;52:362-8. https://doi.org/10.1136/thx.52.4.362
  14. Pancherz H, Winnberg A, Westesson PL. Masticatory muscle activity and hyoid bone behavior during cyclic jaw movements in man. A synchronized electromyographic and videofluorographic study. Am J Orthod 1986;89:122-31. https://doi.org/10.1016/0002-9416(86)90088-6
  15. Wright CR, Muyskens JH, Strong LH, Westerman KN, Kingery RH, Williams ST. A study of the tongue and its relation to denture stability. J Am Dent Assoc 1949;39:269-75. https://doi.org/10.14219/jada.archive.1949.0201
  16. Muto T, Takeda S, Kanazawa M, Yamazaki A, Fujiwara Y, Mizoguchi I. The effect of head posture on the pharyngeal airway space (PAS). Int J Oral Maxillofac Surg 2002;31:579-83. https://doi.org/10.1054/ijom.2002.0279
  17. Aboudara C, Nielsen I, Huang JC, Maki K, Miller AJ, Hatcher D. Comparison of airway space with conventional lateral headfilms and 3-dimensional reconstruction from cone-beam computed tomography. Am J Orthod Dentofacial Orthop 2009;135:468-79. https://doi.org/10.1016/j.ajodo.2007.04.043