American Board of Orthodontics (ABO) Practice Exam 2026 - Free Orthodontics Practice Questions and Study Guide

Question: 1 / 660

The maxillary lateral incisor should measure what percentage of the maxillary central incisor?

50%

2/3

The maxillary lateral incisor typically measures about two-thirds of the width of the maxillary central incisor. This proportion is based on the ideal esthetic relationships observed in dental aesthetics, where the relative sizes of teeth contribute to a harmonious smile.

When considering the average proportion, two-thirds, or approximately 66.7%, has been found to provide a pleasing balance between the central and lateral incisors. This guideline assists orthodontists and dentists in achieving optimal aesthetic outcomes during orthodontic treatment or restorative procedures.

The other options do not accurately reflect this established proportion. A measurement of 50% or 1/2 might result in a less coordinated appearance, while 75% could make the lateral incisor appear disproportionately large compared to the central incisor, disrupting the visual balance. Thus, two-thirds is key in achieving a natural look in the dental aesthetic framework.

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75%

1/2

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