• Zahra Khalid, Kashif Iqbal, Sana Khalid, Aima Riaz, and Abdullah Jan.
• Armed Forces Institute of Dentistry, National University of Medical Sciences, Rawalpindi, Pakistan.
• J Coll Physicians Surg Pak. 2020 May 1; 30 (5): 471-475.

ObjectiveTo compare the collum angle of maxillary central incisors in patients with different incisor relationships.Study DesignComparative, cross-sectional study.Place And Duration Of StudyDepartment of Orthodontics, Armed Forces Institute of Dentistry, Combined Military Hospital, Rawalpindi, from March to October 2019.MethodologyPatient data was obtained from the Department of Orthodontics, Armed Forces Institute of Dentistry, Rawalpindi. One Hundred patients were included in the study, which were divided into four groups, 25 patients in each group, based on incisor relationship, i.e. class I, class II div 1, class II div 2, and class III. The collum angle of maxillary central incisors was then measured twice by a single investigator on lateral cephalograms. Sagittal skeletal relationship, age and gender were noted. Molar relationship of the above groups was also recorded from their respective casts.ResultsOut of the 100 patients, 31 were males, while 69 were females. Mean collum angles of maxillary central incisors for class I, class II div 1, class II div 2, and class III were 5.12 ±3.78, 6.09 ±4.57, 15.02 ±7.99, and 6.94 ±3.80, respectively. Collum angle of class II div 2 incisor relationship was significantly greater than other classes (p <0.05). Collum angle of incisors of casts with class II molar relationship also exhibited the same trend, i.e. a greater angle than other groups (p=0.002). There was no significant difference in collum angle among different sagittal skeletal relationships (p=0.476), between males and females (p-value .731) and among different age groups (p=0.194). ICC showed good agreement between the readings of collum angle (Crohnbachs Alpha .997).ConclusionClass II div 2 incisor relationship had a significantly greater collum angle than other groups. Key Words: Collum angle, Incisor inclination, Crown to root angle, Class II div 2 malocclusion.

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