Ch 15 (H&E book) Key Terms

Primary dentition/Deciduous dentition

first dentition to develop

Permanent dentition

second dentition to develop

Universal numbering system (UNS)

Primary and permanent teeth both designated. Primary A-J/K-T, Permanent 1-16/17-32

International numbering system (INS)

Tooth designation using two-digit code. System can be used internationally as well as by electronic data transfer

Palmer Notation Method

tooth designation when oral cavity is divided into quadrants

Dentition periods

three throughout lifetime including primary, mixed, permanent

Primary dentition period

only primary teeth present

Mixed dentition period

follows primary period, both primary and permanent dentition present during this transitional stage

Permanent dentition

final dentition period

Dental anatomy

area of dental science dealing with morphology or form of the teeth for both crown and root

Alveolus (alveoli)

socket(s) of tooth

Alveolar process

dental arch or tooth

Mandibular arch

lower arch

Maxillary teeth

teeth in the maxilla

Mandibular teeth

teeth in the mandible

Occlusion

method by which the teeth of the mandibular arch contact with this of maxillary arch

Midline

vertical reference line that divides arch into two approximately equal halves; right and left

Anterior teeth

incisors and canines, closest to the midline of each dental arch

Posterior teeth

premolars (if present) and molars, farthest from the midline

Quadrants

division dental arches into two parts with four quadrants

DAQT system

Dentition / Arch / Quadrant / Tooth type

Sextants

dental arch division into three parts based on relationship to midline

Anatomic crown

part of crown covered by enamel

Clinical crown

part of anatomic crown observable and not covered by gingiva

Gingival recession

marginal gingiva recedes apically

Anatomic root

part of root covered by cementum

Clinical root

part of anatomic root observable and not covered by gingiva

Root axis line

representing long axis of tooth drawn to divide cervical line

Root concavities

indentation on surface of root

Furcation

area between two or more of these roots

Masticatory surface

chewing surface on most superior surface of crown

Incisal surface

masticatory surface for anterior teeth

Occlusal surface

masticatory surface of posterior teeth

Ridges

linear elevations on masticatory surface of either anterior or posterior teeth

Cusp

one or more major elevation on masticatory surface of canine and posterior teeth

Mesial

closest or more anterior to midline

Distal

farthest or most posterior from midline

Proximal

together both mesial and distal (surfaces between any adjacent teeth)

Interproximal space

area between adjacent tooth surfaces

Contact area

adjacent tooth crowns in the same arch touch on each proximal surface

Height of contour

greatest bulge or elevation of tooth crown

Embrasure

spaces from curvatures where two teeth in the same arch contact

Line angle

line formed by junction of two crown surfaces, designated by combining names of those two surfaces

Point angle

junction of three surfaces of crown, designated by combining name of those three surfaces

Thirds

crown surface or root division into three parts, crown horizontally and vertically and root horizontally