E & H test

Embryology

Prenatal stages before birth

Histology

Study of function and fustructure of tissue, micro level

Prenatal development

Three trimesters and three periods

Embryo

Most critical time, starts brain heart stomodeum

Foetal

Less vulnerable period of growth and maturation

Primary embryonic layers

Ectoderm outer, mesoderm middle, endoderm inner

Ectoderm

Enamel Oregon

Mesoderm

Dental papilla

Endoderm

Lining of organs

Stomodeum

primitive mouth

First branchial arch

Forms, mandibular, lower jaw, muscles of mastication, secondary plate, canines, and posterior teeth of maxilla

Second branchial arch

Forms part of bone, neck, and muscle muscles of facial expression

Frontal nasal process

Upper face forehead, bridge of nose, philtrum, primary palate, fore incisor teeth

Weeks 5 to 12

Nasal cavity is separated from the plate, preventing clefts

odontogenesis

Tooth formation

Developmental disturbances

Genetic from parents and environmental, drugs, and alcohol

Anatomic crown

What you see in mouth fixed enamel over Denton and crown

Clinical crown

Changes overtime as gingiva recedes

CEJ

cementoenamel junction - where cementum of the root meets the enamel of the crown ,

DEJ

dentinoenamel junction-where dentin meets enamel

Roots

taper to end of apex

apical foramen

holes in the apex

alveolar crest

Height of alveolar process

alveolar

Socket space of individual apartment where teeth live and alveolar process

Oral mucosa lining

Inside cheeks, soft, not attached a bone

oral mucosa masticatory

Attached gingiva to bone

oral mucosa specialized

Taste and tongue

Exfoliation

Shedding of primary teeth

resorption

Bone is reabsorbed or taken away- osteoclasts

deposition

Bone is deposited or made - osteoblasts

Enamel

Present in the atomic crown, but not in the root

Enamel prisms/rods

Teardrop shaped head and tell classified structures grow layer upon layer

enamel tufts

Grow up from DEG 1/3 into enamel hypoclassified

enamel Lamella

Leaf like growing down from surface toward DEG organic

strait of rezuis

incremental lines from growth of enamel

spindles

ends of odontoblastic cells of DEJ

Hydroxyapatite

Structure loss in the process of dental decay in enamel

reMineralization

ameloblasts that form enamel die once enamel is made

interprismatic substance

In between the enamel, prisms weaker and we can etch it to bond materials, such as sealants or composite

Neonatal line

Shock line at birth

Mantle Dentin

Stays on top closest to enamel

circumpulpal Dentin

Layer of Dentin surrounding the pulp

peri-tubular

Thicker area of Dentin around the tubes

interttubular Dentin

Between the tubes

Secondary Dentin

After completion of foramen makes pulp size shrink as it grows

tertiary Dentin=reparative dentin

In response to injury or trauma grows more in irregular pattern than primary/secondary

Dentinal tubules

30 000 tube like structures in 1 mm of exposed Denton

odontoplatic process

Extension of the cells that are living along pulpal wall

Sensory nerve

Reason it feels like a live tissue

dentinal hypersensitivity

When denting gets exposed from loss of enamel and loss of cementum

radicular pulp

in the roots

coronal pulp

In the crown

pulpits

Inflammation of the pulp

apical foramen

Wider opening as tooth develops and narrows as the tooth forms Apex

denticles

Pulp stones-masses of Denton attached or unattached to pulp wall

anchors tooth

sharpies fibers in PDL attach tooth to laminate dura

CEJ

cementoenamel junction where enamel of the crown ends and cementum on the roots start

Primary dentin

Cervical half of root developed slow slowly overtime as route is forming

Secondary dentin

Cellular grows more towards apical part of tooth post eruption thicker layer

hypercementosis

Overgrown cementum helps retain tooth in socket, but makes it hard to extract it

cement spurs

at or near CEJ spheres of cementum hard to tell if it is calculus or not