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
Letter to Editor- Oligodontia in Non-syndromic Children: Series of Three Cases
Letter to Editor
Evaluation of Tumour Associated Macrophages and Angiogenesis in Ameloblastoma
Introduction: Ameloblastoma is a locally invasive odontogenic neoplasm that has a high recurrence rate. The invasion of adjacent tissue is supported by angiogenesis stimulated by Tumour-Associated Macrophages (TAMs). TAM...
Squamous Cell Carcinoma Involving Periocular Area
ABSTRACT Squamous Cell Carcinoma (SCC) involving periocular area accounts for 5-10% of all malignant eyelid neoplasms. Although, periocular SCC is the second most common eyelid malignancy after basal cell carcinoma, but...
Risk Factors Associated with Major Neonatal Birth Injuries During Caesarean Section in a Tertiary Care Hospital in Southern India
ABSTRACT Introduction: Neonatal birth injuries are commonly associated with instrumental vaginal deliveries, but have also been known to occur at uncomplicated vaginal or caesarean deliveries. Caesarean section confers s...
Treatment of Skeletal Class III Malocclusion by Surgery First Orthodontic Approach
Images in Medicine