Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
21 Cards in this Set
- Front
- Back
|
Primary tooth buds begin to appear?
|
8 weeks
|
|
|
Stages of tooth development
|
Bud, Cap, Bell, dentinogensis, amelogensis, crown formation, tooth eruption/root formation, root completeion
|
|
|
Bud
submerged? formed by? bone? |
epithelium
dental lamina proliferates down into the ectomesenchyme -10 buds each arch positoning to form socket |
|
|
Cap
formed by? forms? papilla leads to |
enamel organ from ectoderm surrounded by condesaiton of ectomesenchyme forming the dental sac and papilla
dentin and pulp |
|
|
Bell
froms? |
enamel organ into 4 parts
OEE: folds over to from IEE IEE: ameloblast Stellate reticulum Stratum intermedium |
|
|
Amelogenesis complete after?
|
2-3 years after eruption
|
|
|
Initiation of tooth development
starts with? which arises from and then becomes? |
oral epithelium
ectoderm, dental lamina |
|
|
enamel derived from?
everything else derived from? what drives tooth development(example) |
ectoderm
ectomesenchyme ectomesenchyme: if mix ectomesenchyme from incisor with epithelium from molar you get an incisors |
|
|
Basment membrane
also known as? located? fxn? becomes? |
basal lamina
between epithelium and ectomesenchyme mediates signaling b/w epithelium and ectomesenchyme which ultimately controls differentiaiton DEJ |
|
|
Ameloblast Differentiation
derived from? cell shapes change? found where? |
-IEE-->preameloblasts
-cuboidal to columnar -concave part of the bell |
|
|
Odontoblast differentiaton:
derived from? cell shape? becomes? |
dental papilla
columnar extension secreted predentin, start b4 ameloblast, predentin not yet calcified |
|
|
Apposition of enamel and dentin:
what causes preameloblast to become ameloblasts? ameloblast secrete? interface b/w enamel and dentin matrix is? odontoblast process allows what, forms what? predentin there? tome process? ameloblast displaced? odontoblast displaced? |
-predentin
-enamel matrix -DEJ -communications of DEJ down into pulp, dential tubules, no predentin -small ext of ameloblast -upward -downward |
|
|
Amelogensisi
secretory cell fxn locations? mineralization occurs? what is found in tomes processes? role of stellate reticulum |
secretory bottom, nucleus top
outside cell secretory vaculoles nourishement/support for amelobloasts |
|
|
Dentinogensis
where are odontoblastic process located? predentin mineralized where? polarity? predentin matrix secreted by? mineralized by? from? |
-dentinal tubules
-extracellularly -nucleus bottom, seceretory top -odontoblasts, Ca/Phosphate from matrix vacuoles |
|
|
Pattern of Enamel and Dentin Deposition:
dentin occurs when, stimulates what first deposited at? moves in what direction? oldest enamel/dentin found where? |
-before enamel, enamel formation
-incisal edge/cusp tips moves in both direction -DEJ of cusp tips and incisal edge |
|
|
Crown formation
caused by? pulp chamber lined by? enamel and dentin formation proceed from? to? |
collapse of enamel organ
odontoblast cusp tips to CEJ |
|
|
Root Formation:
hertwig's epithelial root sheet from? consists of? fxn? forms roots? CEJ formed when? role of ameloblast at CEJ? role of odontoblast? enamel pearl? Cementum formation? Rest of Malassez? maybe become? CEJ variations |
ectoderm
OEE+IEE guides shape and number of roots then disintergrates no IEE/OEE adjacent changes-->cementum? odontoblast the same-->dentin ameloblast at CEJ don't disintergrate and keeping form enamel root sheet disintergrates allows cementoblasts to lay down cementum opposite of dentin remnanats of hertwigs root sheeth in PDL. cystic due to chronic periapical inflammation overlap: 60-65% edge-edge-30% no not meet: 5-10% |
|
|
Cementogensis:
how to cementoblast form? from? what also forms? |
disintegrate of HER allows dental sac to contract root dentin and differentiate into cementoblasts
cementoblast --> cemntoid which minrealizes to cementum cementoblasts are from ectomesencchyme alveolar bone formation |
|
|
Reduced enamel epithelium
fxn? contributes? secretes? |
protects enamel as tooth erupts
formation of jxnal epithelium by fusing with oral epithelium enzymes for eruption pathway |
|
|
tooth eruption
dentin renewable? ameloblast fate? root formation when? how is the tooth pushed upward? |
-yes
-lost -2-3 years after eruption -PDL change orientaiton |
|
|
Repair strength of dental tissues
|
Dentin>cementum>enamel(0)
|
