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Objective: Current study aimed compare variations of width, length, and width-length ratio of MCIs among patients presenting with replacement of posterior teeth. Materials and Methods: A total of 120 participants male and female subjects with age between 18 to 40 years, having angle class I occlusion and anterior permanent teeth present, presence of anatomically whole MCI, from which good diagnostic cast can be obtained, and no restorations in MCI. Measurements of all these parameters were performed with digital vernier caliper. The clinical crowns of MCI were calculated, the maximum length of the crown and mesio-distal (MD) breadth between the incisal point of the MCI crown and the apical point of the gingival margin. Sample t-test will be applied to compare the effect of gender on width, length, and width-length ratio in both genders. The level of significance was kept 0.05. Results: The males were 54(53.3%) and females were 56(46.7%). The mean age was 30.12 ± 7.25 years. The width of central incisors on right and left sides were 7.96 ± 0.53mm and 7.83 ± 0.61mm respectively. The length of right and left central incisors were 8.27 ± 1.15mm and 8.06 ± 1.57 mm. The ratio of width/length on right and left side was 0.98±0.11 and 1.02±0.29 respectively. There was not statistical difference mean width among genders (p = 0.201 right side, p=0.388 left side). Conclusion: There was no sexual dimorphism for width but width to length ratio was statistically different among gender, higher in females. [ABSTRACT FROM AUTHOR]