

General factors which would influence and tend to favour mandibular prognathism are as follows:
• Increased height of the ramus
• Increased mandibular body length
• Increased gonial angle
• Anterior positioning of the glenoid fossa
•Decreased maxillary length
• Posterior positioning of the maxilla in relation to the cranium
• Prominent chin button
•Varying soft-tissue contours

Source- textbook of oral pathology Shafers and Google images