overview of dentition 1

primary dentition

baby teeth (20)

permanent dentition

adult teeth (32)

mixed dentition

primary + permanent teeth are both present (ages 6 - 12)

How many teeth does primary dentition have in each quadrant?

5

How many teeth does permanent dentition have in each quadrant?

8

DAQT

Dentition, Arch, Quadrant, Tooth

How many arches can you have in the entire oral cavity?

2

How many quadrants can you have in the entire oral cavity?

4

How many sextants can you have in the entire oral cavity?

6

cervical line (CEJ)

separates the anatomic crown from the anatomic root

clinical crown

portion of the tooth that is visible in the oral cavity, any non erupted area is not apart of this

clinical root

portion of the root seen in the oral cavity

root trunk

part of the root of a multi-rooted teeth next to the CEJ that has not split

bifurcation

root trunks divide into two

trifurcation

root trunks divide into three

furcation

point of division

root axis line (RAL)

imaginary line through the center of the tooth root

masticatory surface (posterior)

occlusal surface

masticatory surface (anterior)

incisal surface

facial surface (anterior)

labial

facial surface (posterior)

buccal

cusps

pointed or rounded mounds on the crown of the tooth (canines + posterior)

proximal surface

side wall of tooth that meets or touches side wall of another tooth (medial or distal)

contact area

proximal surfaces touch

which teeth do not have medial/distal contact?

8,9,24,25

purpose of contact areas

1. prevents impaction
2. stabilizes arch
3. prevent buildup
4. protection

rules of contact areas

1. more cervically located anterior to posterior
2. mesial more incisally or occlusally located except: mandibular incisors
3. anterior to posterior - become larger

contact point

relationship between max + mand

height of contour (crest of curvature)

contact areas on proximal surfaces, greatest elevation of the tooth

functions of height of contour

1. stimulation + protection
2. deflect occlusal forces
3. facial contour - max cleaning - lips + cheeks
4. lingual contour - tongue rest - promote cleaninginsu

insufficient contour

inadequate protection - too much stimulation

excessive contour

inadequate stimulation

embrasures

v-shaped spaces formed from curvatures where two teeth in same arch contact

embrasures increase in size from

anterior to posterior

embrasure functions

- spillway
- part of self cleansing
- reduces mastication force
- stimulates gingiva

inter proximal space functions

- vascular support (nourishment)
- prevents impaction
- anchorage + support

which features help stimulate periodontium?

- shape
- height of Contour
- contact areas
- contact point
- interproximal spaces
- embrasures

line angle

where two surfaces meet on the same tooth

point angle

where 3 surfaces of a tooth meet at a point

apical foramen

opening at root apex

what part of the tooth is the bulk in volume?

dentin

what is the periodontal ligament?

anchors tooth in jaw socket

when does primary dentition begin?

eruption of primary mandibular central incisor (6 months)

when does mixed dentition begin?

eruption of the first permanent tooth which is the permanent mandibular first molar 6 yrs old

where is the root the widest?

CEJ

which surface is the root more bulky? facial or lingual

facial

What are root concavities?

Indentations on the root surface