What is the cause of relapse of deep occlusion?

What is the cause of relapse of deep occlusion?

• A. Lack of occlusal stop
• B. Lack of posterior occlusal plane
• C. Lack of anterior occlusal plane
• D. Continuous eruption of the lower molars

Answer: (A)

The key factor in preventing relapse of a deep bite is maintaining a proper posterior vertical stop. When there is a lack of occlusal stop, the posterior teeth do not contact in centric relation to restrain vertical movement. Without this stop, the jaw can rotate as it closes, and posterior teeth may erupt or supraerupt while anterior teeth may continue to erupt or incline, driving the bite back toward a deeper overbite. In other words, the posterior occlusal contacts act as a vertical restraint that helps lock the bite at the correct overbite; removing that restraint allows vertical changes that relapse the deep occlusion. Other options describe aspects of the occlusal plane or posterior eruption as contributors, but the most fundamental cause of relapse here is the absence of a posterior occlusal stop that stabilizes vertical dimension. Continuous eruption of the lower molars can contribute to changes, but it does so only insofar as the posterior stop is missing to counteract it; the core issue is the missing posterior vertical constraint.

The key factor in preventing relapse of a deep bite is maintaining a proper posterior vertical stop. When there is a lack of occlusal stop, the posterior teeth do not contact in centric relation to restrain vertical movement. Without this stop, the jaw can rotate as it closes, and posterior teeth may erupt or supraerupt while anterior teeth may continue to erupt or incline, driving the bite back toward a deeper overbite. In other words, the posterior occlusal contacts act as a vertical restraint that helps lock the bite at the correct overbite; removing that restraint allows vertical changes that relapse the deep occlusion.

Other options describe aspects of the occlusal plane or posterior eruption as contributors, but the most fundamental cause of relapse here is the absence of a posterior occlusal stop that stabilizes vertical dimension. Continuous eruption of the lower molars can contribute to changes, but it does so only insofar as the posterior stop is missing to counteract it; the core issue is the missing posterior vertical constraint.