Which type of malocclusion may be accompanied by negative sagittal inocclusion?

• A. Class II / 1 Angle
• B. Class II / 2 Angle
• C. Class III Angle, true form
• D. Cross-occlusion

Answer: (C)

Negative sagittal occlusion means the lower teeth overlap or sit ahead of the upper teeth in the front, producing a reverse overjet. This is a hallmark of Class III relations, especially when the skeletal relationship is truly abnormal. In a true skeletal Class III malocclusion, the mandible is prognathic or the maxilla is retrusive, so the dental arches meet in a way that the lower front teeth lie ahead of the upper front teeth. That sagittal mismatch is best described by a true skeletal Class III malocclusion, hence the correct choice.

Class II patterns typically show an increased overjet (maxilla ahead of mandible), not a negative one. Cross-occlusion refers to a transverse rather than sagittal problem, and while it can occur with various anteroposterior relations, it does not specifically define negative overjet in the way a true skeletal Class III does.