1: Histology

Question 1

operative dentistry definition

Answer 1

treatment and prevention of pathological processes involving enamel and dentin of the natural teeth

Question 2

goals of tx

Answer 2

restore proper form, function, and esthetics

Question 3

initiation stage

Answer 3

(bud stage of development) - first stage
first epithelial incursion into the ectomesenchyme of the jaw
supporting ectomesenchymal cells are packed beneath and around the bud

Question 4

proliferation stage

Answer 4

(cap stage) - second stage
bud proliferates into ectomesenchyme
called dental (enamel) organ
forms the enamel eventually
clusters of blood vessels enter the papilla (pulp) during this stage

Question 5

histo-differentiation and morpho-differentiation stage

Answer 5

(bell stage) - third stage
under surface of cap deepens, forming a bell
development of different tissue types
shape and size of crown formed

Question 6

dental organ forms the

Answer 6

enamel

Question 7

dental papilla forms the

Answer 7

dentin and pulp

Question 8

dental follicle forms the

Answer 8

cementoblasts and cells of the PDL (?)

definition: condensed ectomesenchyme limiting the dental papilla and encapsulating the dental organ

Question 9

late bell stage

Answer 9

lamina disintegrates, tooth develops apart from the oral epithelium

Question 10

enamel organ formation occurs

Answer 10

in the cap through bell stages, up to the point of dentin formation; in crown stage hard tissues are laid down

Question 11

life cycle of a tooth

Answer 11

growth (initiation/bud, proliferation/cap, morpho-differentiation, histo-differentiation/bell)

calcification (apposition)

eruption (before and after emergence)

attrition

Question 12

enamel

Answer 12

• formed by ameloblasts in the ectoderm
• thickest at incisal/occlusal edges, thinnest at CEJ
• lobes begin as separate cusps, then coalesce
• developmental grooves can happen between cusps - enamel decreases here
• NO enamel in a fissured junction (non-coalesced - they didn’t come together properly) = pit

Question 13

pit

Answer 13

non-coalesced enamel at the deepest point of a fossa

Question 14

enamel fxn

Answer 14

protects dentin and pulp
5x harder than dentin (like STEEL!)
strong and brittle - 90% hydroxyapatite
requires dentin to support masticatory forces

Question 15

enamel rods

Answer 15

aligned perpendicular to DEJ except near CEJ where they are slightly apical

ON SLIDE 9