Dental Anatomy & Morphology Understanding Flashcards

Which primary (deciduous) tooth has no permanent successor?

Answer: None — all primary teeth have successors

Every primary tooth has a permanent successor — the 20 primary teeth are replaced by 20 of the 32 permanent teeth.

The root of the maxillary first premolar is typically bifurcated in what proportion of cases?

Answer: About 50–60%

The maxillary first premolar has two roots (buccal and lingual) in approximately 50–60% of cases, making it the most commonly bifurcated premolar.

Which cusp is the largest and most prominent on the mandibular first molar?

Answer: Mesiobuccal cusp

The mesiobuccal cusp is the largest cusp on the mandibular first molar, followed by the mesiolingual cusp.

What is the name of the ridge that connects the buccal and lingual cusps on a posterior tooth, crossing the occlusal surface transversely?

Answer: Transverse ridge

A transverse ridge is formed by the union of two triangular ridges from opposing buccal and lingual cusps crossing the occlusal surface.

Which of the following accurately describes the embrasure?

Answer: The V-shaped space occlusal or incisal to the contact area between adjacent teeth

An embrasure is the V-shaped space that widens from the contact area toward the buccal, lingual, occlusal/incisal, or cervical direction between adjacent teeth.

The primary (deciduous) maxillary second molar most closely resembles which permanent tooth in morphology?

Answer: Maxillary first molar

The primary maxillary second molar closely resembles the permanent maxillary first molar in its cusp arrangement and occlusal pattern.

Which permanent tooth is most likely to exhibit a 'shovel-shaped' lingual morphology, particularly in individuals of Asian descent?

Answer: Maxillary central incisor

Shovel-shaped incisors, characterized by prominent marginal ridges on the lingual surface, are most common on maxillary central incisors and show a strong genetic association with East Asian populations.