Which of the following is the most likely cause of this patient’s maxillary central diastema?
A. Tongue thrust
B. Enlarged incisive papilla
C. Periodontal involvement
D. Developing radicular cyst
E. Location of the frenal attachment
The correct answer and explanation is :
The correct answer is: E. Location of the frenal attachment
A maxillary central diastema, which refers to a space between the two upper central incisors, can be caused by several factors, but the most likely cause—particularly in children and adolescents—is the location of the maxillary labial frenum attachment. The frenum is a fold of mucous membrane that connects the lip to the alveolar mucosa. In some individuals, the frenum inserts too low or too close to the interdental papilla or even between the central incisors. This can create tension that prevents the incisors from coming together, leading to or maintaining a diastema.
In early childhood, a diastema can be a normal developmental finding. However, when the frenal attachment is high and thick, it can physically interfere with the natural closure of the space as the dentition matures. A common clinical sign is a frenum that appears to “blanch” when the upper lip is pulled upward—a test called the “blanch test”. If the frenum is implicated, it may require surgical correction through a procedure called a frenectomy.
Let’s briefly examine the other choices:
- A. Tongue thrust can contribute to spacing and flaring of teeth, but it usually affects multiple anterior teeth rather than causing an isolated maxillary central diastema.
- B. Enlarged incisive papilla may be a secondary result of a high frenum or inflammation, but it is not a primary cause of a diastema.
- C. Periodontal involvement typically affects adults and would lead to diastemas due to bone loss and tooth mobility—not seen in a young or otherwise healthy patient.
- D. Developing radicular cyst is usually associated with non-vital teeth and periapical pathology, not with midline diastema.
In summary, while multiple etiologies can contribute to a maxillary central diastema, the location of the frenal attachment is the most likely and most common cause, especially in developing dentitions.