American Board of Orthodontics (ABO) Practice Exam

Question: 1 / 660

How much enamel is present from premolars to the second molar?

8 mm

9 mm

10 mm

The correct answer of 10 mm reflects the average thickness of enamel found on the crowns of teeth, particularly from the premolars to the second molar within the arch. It's important to recognize that enamel measurement can vary among individuals; however, studies suggest that the average enamel thickness in this region generally falls around this figure.

Enamel protects the underlying dentin and is crucial for dental health, serving as the first line of defense against cavities and wear. Understanding enamel thickness is vital for orthodontic treatment planning, as it influences decisions related to tooth movement, the application of forces, and how those forces may affect the overall anatomy of the tooth and surrounding structures.

The choices of different thicknesses represent variations that may occur in individual cases or anatomical differences, but 10 mm stands out as a well-supported, clinically relevant average for this specific area of dental anatomy.

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12 mm

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