Three-Dimensional Assessment of Pharyngeal Airway Space by MRI in Class II Division 1 Patients Treated by Twin Block Appliance
Journal Title: Journal of Clinical and Diagnostic Research - Year 2018, Vol 12, Issue 9
Abstract
ABSTRACT Introduction: A close relationship exists between pharyngeal airway and dentofacial structures. Retrognathic mandible is an anatomic predisposing factor for narrow pharyngeal airway. Twin Block appliance improves the patency of pharyngeal airway by correction of mandibular retrognathia in growing patients. Aim: To assess changes in pharyngeal airway space by MRI in Class II Division 1 subjects treated by twin block appliance. Materials and Methods: A total of 12 patients (two females and ten males) in the age group of 12-14 years were treated by Twin-Block appliance for correction of Class II Division 1 malocclusion. All the orthodontic records and MRI were collected at two stages, T1 (Pre-treatment) and T2 (Post-treatment). Three-dimensional analysis of pharyngeal airway space was performed. Normality of the data was checked by Kolmogorov Smirnov test. Paired-t test was performed to compare the means at T1 and T2. Results: Following Twin Block treatment, MRI showed statistically significant increase in pharyngeal airway space in all three dimensions. Maximum increase in volume was seen in oro-pharynx (240±92.75 mm3, p<0.05) followed by hypo-pharynx (207±139.62 mm3, p< 0.01) and naso-pharynx (111.51±137.03 mm3, p< 0.05). Laterally and sagitally, maximum increase of 1.61±.55 mm and 1.92±0.89 mm respectively was seen in oro-pharynx (P<0.001). Vertically, total increase of 3.73 mm was observed in pharyngeal airway with the highest increase in hypo-pharynx (1.421mm, p< 0.05) followed by oro-pharynx (1.392 mm) and naso-pharynx (0.917 mm). Conclusion: There is a positive impact of Twin Block treatment on pharyngeal airway dimensions. When narrow airway is suspected clinically or on cephalograms, MRI is useful for dynamic pharyngeal airway space analysis, as transverse and volumetric changes cannot be appreciated by two-dimensional imaging.
Authors and Affiliations
Ram Gopal, Tulika Tripathi, Priyank Rai, Anup Kanase
Keywords
Related Articles
- EP ID EP525838
- DOI 10.7860/JCDR/2018/32552.12022
- Views 56
- Downloads 0
Prevalence of Gestational Glucose Intolerance and Gestational Diabetes in a Tertiary Care Centre in Northern India
ABSTRACT Introduction: Many centres in India have adopted a one-step method known as Diabetes in Practice Study Group in India (DIPSI) criterion to diagnose Gestational Diabetes Mellitus (GDM). Prevalence of GDM is incre...
Mullerian Agenesis Associated with Turner’s Syndrome
Turner’s syndrome is a chromosomal disorder with 45 X0 due to absence of a set of gene from the short arm of X chromosome. The incidence of Turner’s syndrome is 1 in 2500 live births. Primary amenorrhea is well known in...
Development of a Trans-disciplinary Intervention Module for Adolescent Girls on Self-awareness
Introduction: Mental health promotion among adolescents has been a key area of intervention for professionals working with children and adolescents. The opinions of experts in the field of mental health have taken to fra...
Role of Ultrasonography in Imaging of Tumours Around Knee Joint
ABSTRACT Introduction: Imaging of the neoplasms of knee is important for multidisciplinary management in the modern day practice. Radiography followed by Magnetic Resonance Imaging (MRI) is a commonly used modality, wher...
Molecular Identification of Mutations Associated with Pyrazinamide-Resistance in Multidrug-Resistant Tuberculosis in Eight Provinces of Iran
Introduction: Multidrug-Resistant Tuberculosis (MDR-TB) is a growing concern which has always played a role in controlling infectious diseases. Pyrazinamide (PZA) is one of the four front line cures of tuberculosis durin...