PHARYNGEAL AIRWAY VOLUME FOLLOWING ...

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that allow a better understanding of what happens to the airway over time. The CBCT studies have been limited by small sample sizes and the fact that patients having different types of orthognathic surgery were analyzed together. The purpose of the current study was to evaluate pharyngeal airway volume changes following MMA surgery in a larger sample of surgical patients than previously investigated by others and at multiple time points to obtain a more accurate indication of how the airway volume is affected. In addition, we also wanted to determine if a correlation existed between the amount of skeletal advancement and the percentage of airway volume change. Materials and Methods Sample For this retrospective study, records of 55 patients who had undergone combined orthodontic treatment and maxillomandibular advancement surgery to correct skeletal dysplasias were collected. The sample was comprised of 35 females and 20 males, including 7 patients with obstructive sleep apnea. Eighteen patients had a genioplasty procedure (14 advancements, 4 reductions). The mean age was 28.33 28
years. Females had a mean age of 28.31 years (range = 17- 60 years), and males had a mean age of 28.35 years (range = 17-59 years). The inclusion criteria were combined orthodontic/orthognathic surgery patients who had undergone maxillomandibular advancement surgery, had pre-surgical CBCT scans taken within a week prior to surgery and at least one scan taken at a minimum of eight weeks following surgery. The exclusion criteria were patients possessing craniofacial syndromes. All surgeries were performed by one of two oral surgeons utilizing the same surgical technique, which consisted of a bilateral sagittal split advancement osteotomy (BSSO) of the mandible followed by a single or multiple piece maxillary advancement osteotomy. For large surgical movements, bone grafts were placed in the osteotomy site. Prior to rigid fixation of each jaw, the mandibular condyles were seated in centric relation. Imaging Pre-surgical and post-surgical CBCT scans were performed utilizing the same i-CAT CBCT machine (Imaging Sciences International, Hatfield, PA). The field of view was 23cm by 19cm. All scans were taken with the condyles seated in centric relation. 29
Page 1 and 2: PHARYNGEAL AIRWAY VOLUME FOLLOWING
Page 3 and 4: PHARYNGEAL AIRWAY VOLUME FOLLOWING
Page 5 and 6: ACKNOWLEDGEMENTS I would like to th
Page 7 and 8: LIST OF TABLES Table 3.1: Descripti
Page 9 and 10: CHAPTER 1: INTRODUCTION Combined or
Page 11 and 12: CHAPTER 2: REVIEW OF THE LITERATURE
Page 13 and 14: the posterior pharyngeal wall, 2 or
Page 15 and 16: mask discomfort, nasal dryness, and
Page 17 and 18: Tongue-Reduction Procedures Other s
Page 19 and 20: structures causes the airway muscle
Page 21 and 22: after surgery, the upper retropalat
Page 23 and 24: skeletal tissues, soft tissues, and
Page 25 and 26: Literature Cited 1. Schwab RJ, Gold
Page 27 and 28: 19. Wittels EH, Thompson S. Obstruc
Page 29 and 30: 37. Li KK, Guilleminault C, Riley R
Page 31 and 32: CHAPTER 3: JOURNAL ARTICLE Abstract
Page 33 and 34: patients often have elongated soft
Page 35: subsequent to orthognathic surgery
Page 39 and 40: Line from Sella to PNS Posterior of
Page 41 and 42: Line from Maxillary Incisor to Post
Page 43 and 44: counterclockwise rotation of the ma
Page 45 and 46: Table 3.1: Descriptive Statistics f
Page 47 and 48: Volume (cubic mm) 30000.00 25000.00
Page 49 and 50: percent change from T0 to T2 (r=.55
Page 51 and 52: surrounding soft tissues encroachin
Page 53 and 54: the pre-surgical values, but there
Page 55 and 56: Conclusions 1. In this study, patie
Page 57 and 58: 10. Lyberg T, Krogstad O, Djupeslan
Page 59 and 60: 27. Li KK, Powell NB, Riley RW, Tro

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