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. 2017 Jan 25;39(1):3.
doi: 10.1186/s40902-017-0101-9. eCollection 2017 Dec.

Comparison of the effects on the pharyngeal airway space of maxillary protraction appliances according to the methods of anchorage

Won-Gyo Seo  1 , Se-Jin Han  1
Affiliations

Comparison of the effects on the pharyngeal airway space of maxillary protraction appliances according to the methods of anchorage

Won-Gyo Seo et al. Maxillofac Plast Reconstr Surg. .

Abstract

Background: The purpose of the study is to compare the effects on the pharyngeal airway space of skeletal anchored face mask with those of tooth-borne facemask.

Methods: We used two types of facemask for maxillary protraction, the tooth-borne facemask (TBFM) and the skeletal anchored facemask (SAFM), and evaluated the effects of each facemask on the pharyngeal airway. Twenty-eight patients (mean age 10.3 years) were treated with the TBFM and 24 patients (mean age 11.2 years) were treated with the SAFM. Lateral cephalometric radiographs were taken before treatment (T1) and after treatment (T2) to assess changes in the dimensions of the upper airway. Statistical analysis was performed with independent t tests, matched t tests, Mann-Whitney U tests, and Kruskal-Wallis tests.

Results: There were marked increases in upper airway dimensions in both groups following treatment, but the SAFM group had a significantly greater increase in airway dimensions than the TBFM group. Also, the SAFM subgroups showed more improved airway measurements than the TBFM subgroups in both the superior and inferior pharyngeal airways.

Conclusions: SAFM is more effective than TBFM in increasing upper airway dimensions.

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Figures

Fig. 1
Fig. 1
a Intraoral view of the application of two curvilinear plates on the lateral nasal walls of the maxilla. b Preoperatively modified miniplates (Synthes, Zuchwil, Switzerland). c Postoperative panoramic radiograph showing miniplate positioning
Fig. 2
Fig. 2
a Frontal view of the patient with a facemask. b Intraoral view of face mask and rapid palatal expansion. c Panoramic radiograph showing rapid palatal expansion
Fig. 3
Fig. 3
Cephalometric measurements used in this study. 1 SNA, 2 SNB, 3 N. Per. to A, 4 palatal P, 5 Co-A (dotted line, maxillary advancement measurement), 6 Mn. Length, 7 ANB, 8 U1 to SN, 9 FMA, 10 IMPA
Fig. 4
Fig. 4
Anatomic points and linear measurements used in this study. P indicates the tip of the soft palate, C2 the most posterosuperior point on the odontoid process of the axis, C2i the most anteroinferior point on the body of the second cervical vertebra, C4 the most posteroinferior point on the body of the fourth cervical vertebra. 1 SPPS, 2 MPS, 3 IPS
Fig. 5
Fig. 5
Anatomic points and areal measurements used in this study. Cv3i indicates the most inferior point of the third cervical vertebra, Hyoid the most superior and anterior point on body of the hyoid bone. 1 SPPA, 2 MPA, 3 IPA
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