DAT 118: Test 3 STUDY GUIDE

odontogenesis?

process of tooth development

developmental disturbances can occur within?

each stage of odontogenesis

face begins to develop?

third week of fetal life

dentition?

natural teeth in jaws

primary dentition?

child develops during prenatal period/consists of 20 teeth

permanent dentition?

consisting of 32 teeth

odontogenesis of primary dentition begins?

between 6th-7th week of prenatal development

initial identifiable stages in tooth development?

bud stage/cap stage/bell stage

apposition stage?

formation of partially mineralized dental tissue types

initiation stage?

beginning stage/involves physiologic process of induction

dental lamina?

growth from oral epithelium giving rise to tooth buds

anodontia?

lack of initiation within dental lamina results in absence of single tooth/multiple teeth

clinical disturbances with initiation stage?

anodontia

supernumerary teeth?

abnormal initiation result in development of one/more extra teeth

bud stage occurs?

first stage of odontogenesis/beginning of 8th week of prenatal development

bud stage?

extensive proliferation of dental lamina into buds

clinical disturbances with bud stage?

macrodontia/microdontia

macrodontia?

abnormally large teeth

microdontia?

abnormally small teeth

cap stage occurs?

second stage of odontogenesis/between 9th-10th week

cap stage?

dental papilla will produce future dentin/pulp for inner part of tooth

outside of cap of enamel organ condenses into?

dental sac

tooth germ?

enamel organ/dental papilla/dental sac

dental sac will produce?

periodontium

periodontium?

supporting tissue types of tooth

clinical disturbance with cap stage?

dens in dente

dens in dente?

enamel organ may abnormally invaginate by growth into dental papilla

fusion?

union of two adjacent tooth germs

tubercles?

appear as small round enamel extensions forming extra cusps

bell stage occurs?

third stage of odontogenesis/between 11th-12th week

inner epithelium of enamel organ becomes?

ameloblasts

peripheral cells of dental papilla become?

odontoblasts

dental sac forms cells?

cementoblasts

matrix?

extracellular substance that is partially mineralized

maturation stage?

reached when matrices of hard dental tissue types subsequently fully mineralize to correct levels

clinical disturbances with apposition stage/maturation stage?

enamel dysplasia/enamel hypoplasia/enamel hypocalcification

enamel dysplasia?

faulty development of enamel

local enamel dysplasia?

result from trauma/infection occurring to small group of ameloblasts

systemic enamel dysplasia?

involves larger numbers of ameloblasts/result from traumatic birth

enamel hypoplasia?

results from reduction in quantity of enamel matrix

enamel hypocalcification?

results in reduction in quality of enamel maturation

root development?

takes place long after crown is completely shaped/tooth is starting to erupt into oral cavity

clinical disturbances with root formation?

enamel pearl/dilaceration

enamel pearl?

misplaced ameloblasts can migrate to surface of root

dilaceration?

distorted roots/severe associated crown angulation in formed tooth

active eruption?

actual vertical movement of tooth

passive eruption?

gingival tissue recedes but no actual tooth movement takes place

succedaneums permanent tooth erupts in position?

lingual to roots of shedding primary tooth

clinical considerations with eruption process?

challenges with spacing

avulsed tooth?

tooth is completely removed from socket

first eruption of primary tooth?

primary mandibular central incisor (6-10 months)

primate spaces?

involving spaces between primary lateral incisor/canine

pulp cavity on primary teeth shows both pulp chambers/pulp horns?

larger in proportion

early childhood caries?

prolonged nighttime use of baby bottle with cavity-causing beverage

embryology?

study of prenatal development

prenatal development begins?

start of pregnancy/continues until birth of child

prenatal development successive periods?

preimplantation period/embryonic period/fetal period

facial/oral structures begin in?

embryonic period

clinical considerations for prenatal development?

congenital malformations

preimplantation period?

woman’s ovum is penetrated by/united with man’s sperm during fertilization

preimplantation period occurs?

1st week after conception

implantation?

blastocyst becomes embedded in prepared endometrium

clinical disturbances for preimplantation period?

down syndrome

down syndrome?

extra chromosome number 21 is present after meiotic division

4th week?

movement of embryonic cell layers forms one long hollow tube lined by endoderm from cephalic end to caudal end of embryo

clinical considerations for embryonic period?

ectodermal dysplasia/Treacher Collins syndrome/rubella/syphilis/fetal alcohol syndrome/spina bifida

ectodermal dysplasia?

abnormal development of one/more structures from ectoderm

treacher collins syndrome?

failure of migration of neural crest cells to facial region

rubella?

cataracts/cardiac defects/deafness/skin rash

syphilis?

produces defects in incisors/molars/blindness/deafness/paralysis

fetal alcohol syndrome?

result of teratogenic drug effect

spina bifida?

defects in vertebral arches

fetal period occurs?

9th-13th week

fetal period?

process involves embryo enlarging to become fetus

clinical considerations for fetal period?

tetracycline stain

tetracycline stain?

result in systemic tetracycline antibiotic therapy within child’s primary teeth that are developing at that time

three embryonic layers?

ectoderm/mesoderm/endoderm

meckel cartilage?

during growth of mandibular arch forms within each side of arch

frontonasal process?

forms as bulge of tissue at most cephalic end of embryo/cranial boundary of stomodeum

maxillary process?

adjacent swelling forms from increased growth of mandibular arch on each side of stomodeum

maxillary processes contribute to?

sides of upper lip

two medial nasal processes contribute to?

philtrum

philtrum?

groove between base of nose/upper lip

clinical considerations for upper lip development?

cleft lip

cleft lip?

failure of fusion of maxillary process with medial nasal process

primitive pharynx?

hollow tube of embryo is derived from anterior part of foregut

branchial apparatus consists of?

branchial grooves/branchial arches/membranes/pharyngeal pouches

branchial arches?

stacked bilateral swellings of tissue appear inferior to stomodeum

second branchial arch (hyoid arch)?

cartilage similar to mandibular arch

third branchial arch?

cartilage will be responsible for formation of parts of hyoid bone

development of orofacial structures occur?

4th-12th week of prenatal development

development of orofacial structures include?

palate/nasal septum/nasal cavity/tongue

formation of palate occurs?

5th week of prenatal development with embryonic period

primary palate?

smaller part of hard palate is located anterior to incisive foramen/will contain maxillary anterior teeth

development of palate consecutive stages?

formation of primary palate/formation of secondary palate/completion of final stage

palate shelves?

bilateral maxillary processes give rise

tongue forms?

floor of primitive pharynx

developing tongue muscles begin to function?

tongue contracts/moves out of way of developing palatal shelves

secondary palate?

gives rise to posterior 2-3rds of hard palate/contains anterior maxillary teeth/posterior teeth/soft palate/uvula

palate completion?

mature oral cavity becomes completely separated from nasal cavity