Principles Of Tooth Preparation Practice Test

Preserving marginal ridges during tooth preparation helps to achieve what outcome?

Preserving marginal ridges is primarily for esthetics. Maintaining marginal ridges helps preserve tooth strength, cusp support, and occlusal stability. It has no impact on tooth strength. Marginal ridges have no effect on tooth preparation.

Correct Answer:

Maintaining marginal ridges helps preserve tooth strength, cusp support, and occlusal stability.

Explanation:

Preserving marginal ridges helps keep the tooth structurally strong and stable under chewing forces. Those ridges act like supportive rims that reinforce the cusps, distribute occlusal loads more evenly, and maintain proper contact and guidance. When they’re preserved, the tooth is better able to resist fracture and maintain occlusal harmony after crown preparation. Esthetics can be affected, but the primary functional benefit is maintaining tooth strength, cusp support, and overall occlusal stability. If the ridges are reduced or removed, the tooth becomes weaker, more prone to fracture, and more susceptible to occlusal disharmony.

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