Which statement best describes how incisal guidance affects posterior occlusion in restorative planning?

• A. It ensures posterior teeth are always in contact in centric relation
• B. It influences the posterior disclusion pattern and helps set cusp heights
• C. It only affects anterior tooth aesthetics
• D. It has no impact on restorative planning

Answer: (B)

Incisal guidance defines how the front teeth guide mandibular movements, and that path directly shapes how the back teeth should interact during those moves. In restorative planning, you design cusp heights and occlusal contacts so that, as the jaw follows the anterior guidance, the posterior teeth disclude in the intended pattern. If the incisal guidance is steep, posterior disclusion tends to occur earlier in protrusive movement, which may lead you to adjust cusp heights to maintain smooth, non-interfering contacts during function. If it’s shallower, posterior contacts may persist longer, influencing how you set cusp angles and occlusal schemes. This relationship—posterior disclusion patterns aligned with the cusp-height design to harmonize with anterior guidance—is why that choice best captures how incisal guidance affects posterior occlusion in restorative planning. It’s not about fixed centric contacts, nor is it limited to aesthetics, and it does have a meaningful impact on planning.