In microdentition, the sum of the mesiodistal diameters of the four upper incisors is most likely to be:

In microdentition, the sum of the mesiodistal diameters of the four upper incisors is most likely to be:

• A. Less than 28 mm
• B. Less than 30 mm
• C. Over 32 mm
• D. Less than 36 mm

Answer: (A)

Microdontia means the teeth are smaller than normal, so the widths of the teeth along the arch are reduced. For the maxillary incisors, the combined mesiodistal widths in a typical, normal dentition are around 30 mm. When microdontia is present, that sum tends to drop below this, often under 28 mm. So the most likely value for the four upper incisors in microdentition is less than 28 mm. The other options imply sums that are too large for microdontia or are not as specifically representative of the reduced sizes seen in this condition.

Microdontia means the teeth are smaller than normal, so the widths of the teeth along the arch are reduced. For the maxillary incisors, the combined mesiodistal widths in a typical, normal dentition are around 30 mm. When microdontia is present, that sum tends to drop below this, often under 28 mm. So the most likely value for the four upper incisors in microdentition is less than 28 mm. The other options imply sums that are too large for microdontia or are not as specifically representative of the reduced sizes seen in this condition.