Final answer:
The facial shape most associated with class III occlusion is a prognathic profile, where the lower jaw is significantly more prominent and there may be a concave appearance from the side.
Step-by-step explanation:
The facial shape most associated with class III occlusion is typically described as a prognathic profile. This means that the lower jaw (mandible) is prominent, and there is often a concave appearance to the profile when viewed from the side. Class III occlusion, also known as an underbite or negative overjet, occurs when the lower teeth are positioned forward of the upper teeth. This can be due to various factors, including genetic predisposition, developmental issues, and environmental influences. The association between facial shape and dental occlusion is important for orthodontic diagnosis and treatment planning. In cases where the prognathism is severe, orthognathic surgery may be considered in addition to orthodontic treatment to correct the skeletal discrepancy and achieve a harmonious facial profile.