Step 1: Understanding the concept of underlying cause.
To address the underlying cause of malocclusion, the treatment must eliminate the etiological factor rather than just correcting tooth position
Step 2: Evaluate each option.
(A) Supracrestal fibrotomy: Performed to prevent relapse after orthodontic treatmentIt does not eliminate the primary cause of malocclusion
(B) Craniotomy: A neurosurgical procedureNot related to dental malocclusion
(C) Frenectomy: Removal of an abnormal or high frenum attachmentA high labial frenum can cause midline diastema and spacingBy removing it, the etiological factor is eliminated
(D) Corticotomy: A surgical procedure to accelerate orthodontic tooth movementIt assists treatment but does not remove the primary cause
Step 3: Conclusion.
Frenectomy directly eliminates a causative factor such as an aberrant frenum attachment, thereby addressing the underlying cause of certain malocclusions