Dental Anatomy and Occlusion Flashcards

Which cusp of the maxillary first molar is the smallest and least functional?

Answer: Cusp of Carabelli

The cusp of Carabelli is an accessory cusp on the mesiolingual surface of the maxillary first molar and is the smallest, non-functional cusp.

The mandibular first premolar differs from the second premolar in that it has:

Answer: A prominent mesiolingual developmental groove

The mandibular first premolar has a prominent mesiolingual developmental groove that divides its occlusal surface, distinguishing it from the second premolar.

During protrusive mandibular movement, which contacts are ideally present in a mutually protected occlusion?

Answer: Only anterior tooth contacts

In mutually protected occlusion, protrusive movements are guided by anterior teeth, which disclude the posteriors to prevent wear.

Which root of the maxillary first molar is most likely to be in close proximity to the maxillary sinus?

Answer: Palatal root

The palatal root of the maxillary first molar is the longest and most often projects into or near the floor of the maxillary sinus.

The angle formed between the long axis of a tooth and the occlusal plane is referred to as the:

Answer: Cusp angle

Cusp angle is the angle formed by a line from cusp tip to base of the cusp in relation to the occlusal plane, influencing occlusal forces.

Which permanent tooth has the longest root relative to its crown length?

Answer: Maxillary canine

The maxillary canine has the longest root of all teeth relative to its crown and is one of the most stable teeth in the arch.

The distal surface of the mandibular first molar occludes primarily with which maxillary tooth?

Answer: Both maxillary second premolar and first molar

In Class I occlusion, the distal surface of the mandibular first molar occludes with the distal portion of the maxillary second premolar and the mesial portion of the maxillary first molar.