American Board of Orthodontics (ABO) Practice Exam 2025 – All-in-One Resource to Master Your Orthodontics Certification!

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How much thicker is the enamel on second molars compared to premolars?

0.1-0.2 mm

0.3-0.4 mm

The thickness of enamel varies significantly across different types of teeth due to their functional requirements and anatomical positions. Second molars are generally designed to handle greater occlusal forces compared to premolars; thus, they have thicker enamel for increased durability and protection against wear and cavities.

Research indicates that the enamel on second molars can be approximately 0.3 to 0.4 mm thicker than that on premolars. This specific measurement accounts for the stratification of enamel layers as they adapt to the mechanical demands placed on molars versus premolars. The thicker enamel on molars not only supports their role in grinding food but also enhances their resistance to carious lesions.

Understanding these differences is crucial in orthodontics, as it impacts treatment planning, assessment of tooth integrity, and the expected outcomes of restorative procedures.

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0.5-0.6 mm

0.7-0.8 mm

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