Examination of facial divergence is done by viewing the patient from the side. Facial divergence is often influenced by patient’s ethnicity and racial background. For instance, convex profile with an anterior facial divergence is a normal feature of negroid race groups. Facial divergence is defined as an anterior or posterior inclination of mandible (lower face) relative to the forehead. Assessment of facial divergence is done by a line drawn from the forehead to the chin. Facial divergence of an individual may fall into any one of the following three types: 1. Straight/orthognathic—A line drawn from forehead to chin is almost straight. 2. Anterior facial divergence—The line drawn from forehead to the chin is inclined anteriorly. 3. Posterior facial divergence—The line drawn from forehead to the chin is inclined posteriorly.
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