The surgical procedure of choice for skeletal class 2 malocclusion due to retrognathic Mandible is
**Core Concept**
Skeletal class 2 malocclusion due to retrognathic mandible is a condition where the mandible is underdeveloped or smaller than the maxilla, resulting in an anterior crossbite and a protrusive upper jaw. This condition requires surgical intervention to correct the mandibular deficiency and improve the occlusion.
**Why the Correct Answer is Right**
The surgical procedure of choice for skeletal class 2 malocclusion due to retrognathic mandible is a **Bimaxillary Advancement** or **Mandibular Advancement with Maxillary Osteotomy**. This procedure involves surgically advancing the position of the mandible forward to correct the retrognathic deformity and improve the occlusion. The advancement of the mandible is typically performed in combination with a maxillary osteotomy to correct any associated maxillary excess.
**Why Each Wrong Option is Incorrect**
* **Option A:** **Genioplasty** is a procedure that involves the alteration of the chin, but it is not the surgical procedure of choice for skeletal class 2 malocclusion due to retrognathic mandible.
* **Option B:** **Mandibular Setback** is a procedure that involves the surgical movement of the mandible backward, which would worsen the retrognathic deformity and is not indicated for this condition.
* **Option C:** **Le Fort I Osteotomy** is a procedure that involves the surgical movement of the upper jaw, but it is not the primary procedure for correcting skeletal class 2 malocclusion due to retrognathic mandible.
**Clinical Pearl / High-Yield Fact**
In orthognathic surgery, the goal is to achieve a stable and functional occlusion, and the choice of surgical procedure depends on the underlying skeletal deformity and the desired outcome.
**Correct Answer: C. Mandibular Advancement with Maxillary Osteotomy**