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DANB's Maryland General Dental Assisting - Blogs Sample Questions

Which of the following best identifies the cusps of the mandibular third molar?

Correct Answer:
its cusps are underdeveloped


the mandibular third molar, commonly known as the wisdom tooth, is typically characterized by its underdeveloped cusps. unlike other molars that have well-defined cusps used for grinding food, the cusps of the mandibular third molar are often less pronounced and do not exhibit the typical prominence or sharpness seen in other teeth. this underdevelopment is attributed to the evolutionary changes in human jaws and teeth, suggesting a reduction in the functional need for these molars.

furthermore, the cusps on mandibular third molars frequently appear wrinkled or folded, which is a result of their incomplete or aberrant development. this distinct morphology affects the tooth's effectiveness in performing its intended masticatory functions. in addition to their underdevelopment, the mandibular third molars generally have two roots, which can also be irregular in shape or fused, adding to the complexity of their structure and potential complications during extraction.

in conclusion, the best identification of the cusps of the mandibular third molar is that they are underdeveloped. this characteristic, along with their typically wrinkled appearance, distinguishes them from the cusps of more anterior molars. understanding these anatomical details is crucial for dental professionals when planning treatments involving these teeth, such as surgical extractions or assessing potential impactions or other dental issues.