DTHY 186: Introduction to Terms

Perm dentition

Primary (decduous) dentition

Canines are...

...The corner stones of the mouth

Arch straits of Mand. and Max. primary teeth

Arch traits of Mand. and Max permanent teeth

IMPORTANT= How to name tooth

1. Arch= Max. or Mand.

2. Quadrent= Right or left

3. Type of tooth= Cen., la., 1st, 2nd, 3rd

4. Class of tooth= incisor, canine, premolar, or molar

4 Class Traits

Incisors (central or lateral), canines, premolars, and molars

Universal Numbering System

WHAT WE USE

Universal Numbering System Perm Dentition

MAX = #1-16

Mand = #17-32

Universal Numbering System Primary Dentition

MAX = A-J

MAND = K-T

3rd molars

#1, #16, #17, and #32

Centrals

#8, #9, #24, and #25

1st Molars

#3, #14, #19, #30

1st PreMolars

#5, #12, #21, and #28

Palmer Numbering System for Permanet and Primary Dentition

Uses quadrants 1-4 UR to LR and numbers #1-8 starting at midline and numbers are in brackets

FDI Numbering System for Permanent Dentition

- Uses quadrants 1-4 UR to LR and numbers #1-8 starting at midline

- Numbers are boxed, first number is the quadrant tooth is in and the second is the number tooth (1-8 starting at midline)

FDI Numbering System for Primary Dentition

- Uses quadrants #5-8 UR to LR and numbers #1-5 starting at midline

- Numbers are boxed, first number is the quadrant tooth is in and the second is the number tooth (1-5 starting at midline)

Terminology used to describe tooth

Relative positions

- Mesial, Distal

- Facial, Lingual

- Apical

- Occlusal, Incisal

- Cervical

Clinical Crown

Whats seen, everything

Clinical Root

DOES not show

Anatomical root

Covered in cementum

Anatomical Crown

Covered by enamel

External morphology of the anatomical root

CEJ separates the anatomic crown from the anatomic root

Proximal

Between the teeth

- Mesial surfaces are proximal and face the midline

- Distal surfaces are proximal surfaces that face away from midline

Facial Surface

Buccal and labial

Anterior teeth biting surface

Incisal edge

Posterior teeth biting surface

Occlusal surface

Facial/labial 1/3s division

- Root: apical, middle, cervical

- Crown: Cervical, middle, incisal

- Edge: Distal, middle, medial

Mesial 1/3s division

Labial (facial), middle, lingual

Facial/buccle 1/3s division

- Root: Apical, middle, cervicle

- Crown: Occlusal, middle, cervicle

- Edge: Distal, middle, mesial

Distal 1/3s division

Lingual, middle, buccle

Dimensions: B/F View

Dimensions: Mesial view

Dimensions: Occlusal view

Line angles

Where 2 surfaces meet

Point angles

Where surfaces meet

Facial height of curvature

Hight of contour (crest of curvature) of contact areas

Where the tooth curves the most

Embrasures

Only present wen two adjacent teeth touch

The four embrasures

- Facial

- Lingual: Larger than facial

- Occlusal or incisal: Small

- Cervical: Filled with gingiva

Diastema

Space between teeth

Contact areas

Examples of short hand for note taking

Developmental lobes- Anterior

4 lobes: 3 F and 1 L

Developmental lobes- Premolars

3 F lobes and 1 lobes per lingual cusp

Developmental lobes- Molars

1 lobe per major cusp

Mamelons

Form on adult incisors, 3 labial lobes and usually wear away

Cingulum

The cingulum forms the 4 developmental lobe

Wear facets

Flattened plane produced by wear on convex area of tooth surface and occurs at contact areas

Perikymata

Very small wave-like ripples of enamel on newly erupted teeth

Root axis line

Imaginary line that splits the root in half (mesiodistally or faciolingually)

Lingual covergence

Cervical line of Max. molars

CEJ curves more incisally than the distal CEJ

Maxillary incisor: Incisal proximal crown angle: Labial view

Maxillary roots on molars

3

Mandibular roots on molars

2

Distal curvature of roots