American Journal of Orthodontics and Dentofacial Orthopedics
Original ArticleDentofacial morphology and tongue function during swallowing*,**,*,**,*
Section snippets
Material and methods
One-hundred-twelve healthy volunteers (74 men, 38 women) ranging in age from 20 to 26 years (mean, 22 years) were chosen from the students and the medical staff at Taipei Medical University and the patients in the Department of Orthodontics of the University Hospital. They had no craniofacial deformities or signs of dysphagia or tongue functional disorders. Informed consent was obtained from all volunteers after a brief explanation of this study.
A noninvasive diagnostic technique,
Results
The means and standard deviations of the measurements of dentofacial morphology and the ultrasound measurements of tongue movements from the 112 subjects are shown in Tables II and III.Variable Mean SD Min Max Component 1 SN 70.7 mm 3.4 mm 62.0 mm 79.7 mm SAr 41.4 mm 4.1 mm 31.3 mm 51.6 mm NSAr 122.7° 4.8° 112.4° 132.7° Component 2 ArA 90.6 mm 5.3 mm 79.0 mm 105.2 mm SNA 83.5° 3.5° 75.2° 91.4° Component 3 NA 65.1 mm 3.6 mm 56.5 mm 73.0 mm Palatal depth 27.1 mm 2.7 mm 21.0 mm 35.0 mm AUFH
Evaluation of interrelationship between swallowing and dentofacial morphology
Results of the simple correlation analyses suggest the following trends. First, those who have greater motion magnitude of the early final phase (IIIa) during swallowing tend to have deeper palatal vaults, increased mandibular lengths, longer lower faces, larger overjets, more overerupted molars and incisors, more labially inclined maxillary incisors, decreased ANB angles and Wits appraisals, and shallow overbites. Second, those who have longer durations of swallowing appear to have increased
Conclusions
The following conclusions can be drawn from this study: (1) there are significant correlations between tongue movement during swallowing and dentofacial morphology; (2) the movements of the tongue during swallowing are related to dentofacial forms especially in the motion magnitude of the early final phase; (3) the significantly correlated cephalometric measurement items were AB, AFH, ALFH, UHF/LFH, L1-L1′, L6-L6′, and OJ; (4) the intermaxillary vertical relationship and the mandibular molar
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aGraduate student, Department of Orthodontics, Graduate Institute of Oral Rehabilitation, College of Oral Medicine.
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bAssociate professor, Department of Orthodontics, Graduate Institute of Oral Rehabilitation, College of Oral Medicine.
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cProfessor, School of Public Health, College of Public Health and Nutritional Science.
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dAssociate professor, Department of Orthodontics, Graduate Institute of Oral Rehabilitation, College of Oral Medicine.
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Reprint requests to: Chien-Lun Peng, DDS, PhD, Department of Orthodontics, Graduate Institute of Oral Rehabilitation, College of Oral Medicine, Taipei Medical University, No. 250, Wu-Hsing Street, Taipei, Taiwan; e-mail, [email protected].