Dentistry: Tooth Origin and Formation

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deciduous teeth

The 20 teeth that begin to erupt around the age of 6 months. Eventually pushed out by the permanent teeth.

dentition

arrangement of teeth

succedaneous

permanent teeth

odontogenesis

formation and the origin of the tooth

Initiation

1st stage of development; fifth-sixth week in utero

Proliferation

2nd growth stage; reproduction of new parts; buds or cap stage

Histodiferentiation

3rd stage( part 1); branch into different tissues

Morphodifferentiation

3rd growth stage ( part 2); change into different shape

Apposition

4th growth stage; addition of parts; mineral salts and organic matter are set down for tooth formation

Calcification

5th growth stage; hardening and setting of tooth tissues

Eruption

6th growth stage; tooth breaks through the gums

Attrition

Final (7th) stage of growth; teeth interact through mastication and speech, surfaces wear away

Adontia

partial or total lack of teeth

dens in dente

tooth in tooth

dentinogenesis

weakened or gray colored teeth or shell teeth resulting from poor formation

fluorosis

'mottled enamel' reaction of overfluoridation

fusion

union of tooth buds resulting in a large crown or root

germination

single tooth germ separates to form two crowns on a single root

Hutchinson incisors

rounded or peg-shaped small teeth caused by maternal syphilis during formation

hypocalcifiation

lack of hardening of tooth tissue resulting in weak susceptible teeth

hypoplasia

enamel hypoplasia is lack of enamel covering

macrodontia

abnormally large teeth

microdontia

abnormally small teeth

peg-shaped teeth

small teeth; usually occurs in maxillary lateral teeth

supernumerary

more than normal amount of teeth

enamel

hard tooth covering; 96% inorganic

cuticle (Nasmyth's membrane)

tissue layer covering tooth surfaces wears away soon after eruption

stripes of Retzius

brownish line in enamel

lamellae

cracks or imperfections

Dentin

main tissue surrounding the pulp; 70% INORGANIC

Pulp

soft vascular tooth tissue; found in the center of the tooth; most organic; functions: nourishment, defense, registation of sensation/pain, and dentin protection

pulpitis

toothache

pulp stones (denticles)

a small tooth growth

Cementum

55% inorganic tissue covering of the tooth root

periodintal

membrane, fibers which anchor the tooth in the alveolar socket

odontology

the study of teeth and there care

arch

half of the mouth; maxillary or manibular

quadrant

half of an arch; right or left (8teeth)

incisor

single rooted anterior tooth with cutting edge

cuspid

(canine) single-rooted anterior tooth at the corner of mouth

premolar

(bicuspid) 4th & 5th tooth posterior from the center of the mouth

molar

most posterior teeth, used for grinding; maxillary have three roots, mandibular have two

crown

top part; contains the pulp tooth chamber, dentin &enamel covering

root

bottom part

cervical line

enamel of crown meets cementum of the root

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