What is mesiodens and why is it clinically relevant?

• A. An eruption of third molar earlier than expected.
• B. A peg-shaped lateral incisor.
• C. An extra tooth in the mandibular molar region.
• D. A supernumerary tooth located in the maxillary midline between the central incisors.

Answer: (D)

Mesiodens is a supernumerary tooth that sits in the maxillary midline, between the two central incisors. The term comes from mesio- meaning toward the midline and dens meaning tooth, and it is the most common type of extra tooth in the mouth. Clinically, its presence is important because it can block or delay eruption of the adjacent central incisors, cause a midline diastema, lead to crowding, or even cause root resorption of neighboring teeth. It’s often found on radiographs when eruption problems or misalignment prompt evaluation.

In management, many mesiodentes are monitored if they aren’t interfering, but removal is frequently recommended if they impede eruption, cause crowding, or have odd orientation that could complicate orthodontic treatment. Radiographs help determine its exact position and shape before any procedure. While mesiodens is typically a discrete extra tooth in the maxillary midline, other options describe different conditions: an early eruption of a wisdom tooth, a peg-shaped lateral incisor, or an extra tooth in the lower molar region.