INBDE (Integrated National Board Dental Examination) Practice Exam

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Ace your INBDE with our comprehensive practice exam. Featuring detailed explanations, interactive flashcards, and a wide array of multiple-choice questions designed to mirror the real test. Get ready to surpass your expectations!

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What is the cause of root caries?

P. intermedia
S. mutans
Actinomyces
S. salivarius

The correct answer is: Actinomyces

Root caries are a type of tooth decay that occurs on the root surface of teeth. The cause of root caries is primarily due to the presence of certain bacteria in the mouth that produce acid, which can lead to erosion of the tooth enamel. Specifically, the bacteria Actinomyces has been identified as a major contributor to root caries. While other bacteria such as P. intermedia and S. salivarius may also contribute to tooth decay, they are not as strongly linked to root caries as Actinomyces. S. mutans is also a common cause of tooth decay, but it is more commonly associated with decay on the top, or occlusal surface, of teeth and not as much on the root surface. Therefore, option C, Actinomyces, is the most fitting answer as it is the primary cause of root caries.