INBDE (Integrated National Board Dental Examination) Practice Exam

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What does external resorption involve changes in?

Pulpal layer
Periodontal ligament
Cementoblastic layer
Dentin layer

The correct answer is: Cementoblastic layer

External resorption is a condition in which the body breaks down the cementoblastic layer of a tooth, leading to changes in its structure and potentially causing tooth loss. The pulp, periodontal ligament, and dentin layers are not typically involved in external resorption. The pulp is responsible for producing dentin, but it is not directly involved in the process of external resorption. The periodontal ligament provides support for the tooth and attaches it to the surrounding bone, but it is not responsible for the breakdown of the cementoblastic layer. The dentin layer is responsible for protecting the pulp, but it is not involved in external resorption. Therefore, the correct answer is C Cementoblastic layer.