In macrodontia, the criterion is based on the mesio-distal sum of which teeth and threshold?

• A. Mesio-distal sum of four upper incisors from 28 to 32 mm
• B. Mesio-distal sum of four upper incisors from 32 mm and more
• C. Mesio-distal sum of four lower incisors up to 35 mm
• D. The correlation between the upper and lower incisors

Answer: (B)

Macrodontia is diagnosed by comparing the size of the front teeth. The standard criterion uses the mesio-distal widths of the four upper permanent incisors, added together. If their total is 32 mm or more, that indicates macrodontia. This focus on the upper incisors provides a consistent, easily measurable benchmark for detecting abnormally large anterior teeth.

The other options aren’t used because the measurement is not based on the lower incisors, it does not rely on a range like 28–32 mm, and it isn’t about a relationship between upper and lower incisors.