Pennsylvania Expanded Function Dental Assistant (EFDA) Board Practice Exam

The connection of the occlusal surfaces of posterior teeth is primarily formed by transverse ridges. These ridges are prominent features that run across the occlusal surface from buccal to lingual, providing a functional and structural element to the tooth. They help in creating a pattern for occlusion and assist in the masticatory process by providing a surface for the opposing teeth to contact during chewing.

Transverse ridges, which typically connect the cusps of posterior teeth, play a crucial role in distributing occlusal forces, enhancing the efficiency of chewing, and maintaining the overall alignment of the dental arch. Understanding their anatomy and function is essential for dental assistants, as they impact the fit and function of dental restorations and the overall health of the dentition.

In contrast, marginal ridges refer to the elevated borders found at the mesial and distal edges of the occlusal surfaces, facial and lingual surfaces denote the outer aspects of the tooth as they relate to the cheeks and tongue, and fossae are the concave areas on the occlusal surface, all of which do not specifically connect the occlusal surfaces in the same way transverse ridges do.