Objectives: The purpose of this study was to assess relationship between crown root angulations of maxillary central incisors and lower lip line (a CBCT study and lateral cephalometric study). Methods: A set of 30 conventional lateral cephalograms and CBCT were selected and divided into three groups of 10 each based on the type of malocclusion presented: Class II, division 2 (group 1); Class II, division 1 (group 2); and Class I (group 3). The collum angle of the maxillary central incisor was measured, and the lower lip line was recorded. Results: Analysis of variance (ANOVA) revealed that the mean collum angle was statistically significantly different in the three groups. The mean collum angle was greatest in Class II, division 2 malocclusion (group 1). ANOVA and chi square test showed that the mean collum angle is significantly increased when the lower lip is in between the middle third and cervical third (P < .05) of the central incisor. Also variations in magnitude of the collum angles traced on the lateral cephalograms and CBCT was not significant