To investigate the association between palatal canines and sella bridging as well as to establish the type of calcification of sella common to subjects with impacted canines. METHODOLOGY: The sample included male and female patients aged above 12 years, presenting to the orthodontic OPD of Bahria University Medical and Dental College for fixed or removable orthodontic treatment the sample was 105 divided into subjects (34) and control (71) groups. The control group included patients having normally erupted canines while subjects included at least one palatally impacted canine. The presence of impacted canines was confirmed on OPG while sellae dimensions were measured on lateral cephalometric radiographs. Data was analyzed and factors such as sella dimensions (length, depth and diameter) as well as degree of calcification and its relation to presence of palatally impacted canines was determined by using Chi square test, independent sample t test as well as Pearson correlation test. RESULTS: The mean interclinoidal distance and sella diameter was reduced in subjects as compared to controls. Type II calcification was dominant in both experimental (76.5) and control (78.9) groups. There was a significant negative correlation found amongst subjects and controls using Pearson correlation. The strength of association was higher among subjects as compared to control group. CONCLUSION: Sella bridging is an indicator of palatal impaction of canines as the length and diameter of sella were reduced in experimental subjects. Type II calcification was dominant in subjects as well as control groups.
BJECTIVE: This study was designed to determine the different treatment predictors which help in the extraction and non-extraction decision of an end-on Class II malocclusion case. METHODOLOGY: The pretreatment records of 240 adult subjects aged 15-40 years with bilateral end-on Class II molar relationship were retrospectively selected and categorized under extraction (120) and non-extraction (120) treatment categories. The extraction cases were planned for different combinations of premolar extractions. The independent variables i.e., the cephalometric and orthodontic cast measurements were obtained from the recruited sample. Binary logistic regression analysis was applied using SPSS software. RESULTS: Increased upper and lower incisor inclinations (p < 0.001) and procumbent upper lip (p = 0.004) was statistically significant in the extraction group. According to the regression model, the odds of extraction treatment were 1.12 times greater than non-extraction treatment for every one degree increase in upper and lower incisor inclinations, respectively. The chances of extraction treatment were 1.6 times higher than non-extraction treatment for every 1 mm increase in the distance of upper lip to S-plane. CONCLUSIONS: The upper and lower incisors inclinations and upper lip position are the critical factors affecting the extraction decision in adult patients with end-on Class II molar relationships. Overjet, dental crowding and the vertical growth pattern were found to be clinically insignificant in opting for an extraction treatment plan for such cases. KEYWORDS: Treatment, Angle Class II, tooth extraction, non-extraction
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