A major indication for orthognathic surgery before puberty is
**Core Concept**
Orthognathic surgery involves the correction of jaw deformities to improve facial aesthetics, chewing function, and breathing. Before puberty, the main concern is to address any significant breathing difficulties or sleep disorders caused by the jaw deformity.
**Why the Correct Answer is Right**
The primary indication for orthognathic surgery before puberty is to correct severe mandibular retrognathia (underdeveloped lower jaw) or maxillary hypoplasia (underdeveloped upper jaw), which can cause obstructive sleep apnea (OSA) and other breathing difficulties. This is because the upper airway is narrow and more prone to collapse during sleep in children with these jaw deformities, leading to OSA. Surgery can help widen the airway, improving breathing and sleep quality.
**Why Each Wrong Option is Incorrect**
* **Option A:** While facial aesthetics are an important consideration in orthognathic surgery, they are not a primary indication for surgery before puberty.
* **Option B:** Temporomandibular joint (TMJ) disorders can be a reason for orthognathic surgery, but they are not typically a major indication for surgery in children before puberty.
* **Option C:** Malocclusion (bad bite) can be treated with orthodontic appliances or surgery, but it is not a primary indication for surgery before puberty unless it is severe and causing significant breathing difficulties.
**Clinical Pearl / High-Yield Fact**
Keep in mind that the American Academy of Pediatric Dentistry recommends that children with significant jaw deformities and breathing difficulties should be evaluated by an orthodontist and an oral surgeon before the age of 7 to determine the best course of treatment.
**Correct Answer: C. Malocclusion**