Mesiodens is an example of which type of dental anomaly?

• A. Position anomaly
• B. Number anomaly
• C. Shape anomaly
• D. Dimension anomaly

Answer: (B)

The key idea is that this is about the number of teeth. A mesiodens is an extra tooth that appears in the midline between the maxillary central incisors, so it represents a supernumerary tooth. That makes it a number anomaly—the dentition has more teeth than normal.

If a tooth were simply in an unusual location despite there being the usual number of teeth, that would be a position anomaly. If the tooth had an unusual shape, like a peg lateral or other morphological variation, that would be a shape anomaly. If the tooth were abnormally large or small, that would be a dimension anomaly. Mesiodens is about having an extra tooth, not about where a tooth is, its shape, or its size.