Primary and Permanent Dentition Anatomy

Vocabulary flashcards covering the developmental periods, anatomical landmarks, structural comparisons, and identifying features of the primary and permanent dentitions.

Deciduous dentition

An older and less frequently used dental term describing the primary dentition, which consists of the first set of 20 teeth.

Mixed dentition period

The transitional period occurring between approximately 6 and 12 years of age that begins with eruption of the permanent mandibular first molar and ends with shedding of the last primary tooth.

Permanent dentition period

The final or adult dentition period that begins with the shedding of the last primary tooth, during which growth of the jawbones slows and eventually stops.

Primate spaces

Developmental spaces found between the primary maxillary lateral incisor and canine, and between the primary mandibular canine and first molar.

Leeway space

The mesiodistal difference in size between the primary canines and molars and their permanent canine and premolar successors.

Crown-to-root ratio of primary teeth

A ratio that is smaller in primary teeth than in their permanent counterparts due to primary teeth having shorter crowns and comparatively narrower, longer roots.

Succedaneous teeth

Permanent teeth that replace shed primary teeth of the same type, comprising all 12 permanent anterior teeth and 8 permanent premolars.

Nonsuccedaneous teeth

Permanent teeth that do not replace primary teeth, specifically the permanent molars that erupt distal to the primary second molars.

Cingulum

A rounded, raised anatomical area located on the cervical third of the lingual surface of permanent anterior teeth.

Marginal ridges (anterior teeth)

Rounded, raised enamel borders located on the mesial and distal borders of the lingual surface of anterior teeth.

Lingual fossa

A wide, shallow depression found on the lingual surfaces of anterior teeth.

Mamelons

Three rounded enamel extensions located on the incisal ridge of newly erupted permanent central and lateral incisors that typically undergo attrition shortly after eruption.

Diastema

Open contacts or spaces between teeth, which frequently occur in the permanent maxillary lateral incisor region due to variations in tooth size and position.

Pegged maxillary lateral incisor

A developmental anomaly in which a maxillary lateral incisor forms with an undersized, pointed, or conical crown shape.

Canine eminence

A prominent vertical ridge of alveolar bone located on the labial aspect that externally manifests the long, heavy root of a permanent canine.

Imbrication lines

Developmental horizontal lines on the labial surface of anterior teeth that are usually absent or very faint on permanent mandibular central incisors.

Inclined cuspal planes

Sloping areas located between cusp ridges extending from the tip of a posterior tooth cusp.

Central fossa

A shallow, wide depression on the occlusal table of a posterior tooth located where the cusp ridges converge at a central point and grooves meet.

Occlusal developmental pit

A sharp pinpoint depression found in the deepest portions of a fossa where two or more developmental grooves meet.

Bifurcated root

A tooth root structure divided into two branches, found on maxillary first premolars (facial and lingual roots) and mandibular molars (mesial and distal roots).

Trifurcated root

A tooth root structure divided into three distinct branches, characteristic of permanent maxillary molars.

Mandibular second premolar groove patterns

The three developmental occlusal groove configurations found on mandibular second premolars: U-Type, Y-Type (tricuspidate), and H-Type (bicuspidate).

Cusp of Carabelli

The fifth supplemental cusp located on the lingual aspect of a permanent maxillary first molar, arising from the mesiolingual developmental lobe.

Permanent mandibular first molar cusps

The five developmental cusps of tooth 3.6 or 4.6: mesiobuccal (MB), distobuccal (DB), distal (D), mesiolingual (ML), and distolingual (DL).

6-year and 12-year molars

Alternative clinical names for permanent first molars and permanent second molars, reflecting the approximate chronologic ages at which they erupt.