Comparison of Collum Angle of Maxillary Central Incisor in High Angle and Low Angle Patients

OBJECTIVE: This study aims to determine the mean collum angle of maxillary central incisor and to compare it between high angle and low angle patients undergoing orthodontic treatment. METHODOLOGY: This cross-sectional, observational study was conducted using lateral cephalometric radiographs of 61 class II division 1 patients (comprised 32 males, 29 females, age range 13 to 30 years) from the record files of patients inducted for Orthodontic management from June 2020 till August 2020 at the Department of Orthodontics, Sindh Institute of Oral Health Science, Jinnah Sindh Medical University, Karachi, Pakistan. The sample was divided on the basis of Vertical Analysis (angulation of mandibular plane) into high and low angle cases. Collum angle was measured using the angulation of the Maxillary Central Incisor (MCI). Student t-test was used to compare the mean difference of the collum angle between skeletal vertical malocclusions. RESULTS: Mean value of the collum angle for high angle (Vertical Growth pattern) cases were mean ± standard deviation (4.35°±1.49°) while for low angle groups (Horizontal Growth pattern) were (2.41°±1.60°). CONCLUSION: There Collum angle of permanent maxillary central incisors differ significantly (p<0.001) among high angle and Low angle malocclusions cases (n=61) and showed pronounced axial bending in Class II division 1 incisors with high angle (4.35° ± 1.49°) as compared to low angle malocclusion (2.41° ± 1.60°). KEYWORDS: Collum Angle, Maxillary Central Incisor, Orthodontic Treatment, High Angle, Low Angle.

COLLUM’S ANGLE AND CROWN ROOT ANGLE OF MAXILLARY INCISORS IN DIFFERENT MALOCCLUSIONS

Objective: To determine Collum angle and crown to root angle of maxillary central incisor in different skeletalmalocclusion. Study Design: Comparative cross sectional study. Place and Duration of Study: Orthondontics department, Bolan Medical College, Civil Sandman Hospital,Quetta, from Jun to Dec 2018. Methodology: Data sample consisted of 140 lateral cephalograms. Sample consisted of 74 female cephalograms and 66 male cephalograms. The mean age of sampled subjects ranged between 21.62 ± 5.96 years. The Colum angle of the maxillary central incisors in each group was measured. SPSS version 21 was used to enter and process data. Comparison between Class II division 1 and division 2 collum angles was made by applying student t-test. Results: The average value for Collum angle in class II division 1 sample was 4.38 ± 3.08 with minimum being 0and maximum 15 degree. The average values for Class II division 2 was 10.52 ± 4.37 with minimum 30 and amaximum 23 degree. Conclusion: Maxillary central incisors in all malocclusions had significantly different mean Collum angles fromzero. Paired sample t-test comparison showed that the Collum angle for maxillary central was much higher inClass II division 2.