HOSA Dental Terminology Practice

What surfaces of the premolars and molars are affected by the marginal ridge?

1. Facial and lingual surfaces

2. Mesial and distal margins of the occlusal surfaces

3. Incisal edges only

4. Cervical areas of the teeth

The correct answer is: Mesial and distal margins of the occlusal surfaces

The marginal ridge refers to the elevated borders located on the mesial and distal aspects of the occlusal surfaces of premolars and molars. These areas serve as important anatomical landmarks that help delineate the occlusal surfaces and contribute to the overall function and stability of dental occlusion. The marginal ridges play a vital role in the occlusion of opposing teeth during chewing and can be involved in the interdigitation between upper and lower teeth. The mesial marginal ridge is found on the inner side of the tooth closest to the midline of the dental arch, while the distal marginal ridge is located on the opposite side. These structures assist in the proper alignment and contact of teeth, ensuring effective masticatory function and enhancing the esthetics of the dentition. The other choices do not accurately identify surfaces affected by the marginal ridge. The facial and lingual surfaces pertain to different aspects of tooth morphology without direct relevance to the marginal ridge. Incisal edges relate more to anterior teeth than to the premolars and molars, and the cervical areas of teeth are near the gum line rather than associated specifically with the occlusal surfaces. Understanding the anatomy of marginal ridges is essential for dental professionals, particularly in restorative dentistry and orthodont