9 - Development and Developmental Disturbances of the Teeth Part 1 Flashcards
what are the components of tooth bud?
- Enamel organ
- Dental papilla
- Dental Sac
what do the enamel organ, dental papilla, and dental sac give rise to?
Review said know both the components and what structures come from them
- enamel organ : ameloblasts
- Dental papilla: odontoblasts which produce dentin and mesenchymal cells that become pulpal tissue
- Dental Sac: cementoblasts which produce cementum, osteoblasts which produce alveolar bone, and fibroblasts that produce PDL fibers
what are the morphologic developmental stages?
review said to know the difference between this and histophysiologic
- Dental lamina
- bud stage
- cap stage
- early bell stage
- advanced bell stage
what are the histophysiologic developmental stages?
review said to know the difference between this and histophysiologic
- Initiation
- proliferation
- histodifferentiation
- morphodifferentiation
- apposition
- minteralization
- maturation
when does the dental lamina begin development?
review said ‘ages that these stages are happening at is important’
6 weeks of embryonic age
what is epithelial thickening in region of the future dental arch
Primordium
what does primordium result in?
ectodermal portion of teeth
what is considered initial formation of dental development?
dental lamina
T/F Permanent molars will arise from the dental lamina simultaneously with the primary teeth
False. permanent molars arise separately from the dental lamina
if there is a lack of initiation or arrest in proliferating cells during the bud stage what will this result in?
congenitally missing tooth/teeth
improper continuation of budding of the enamel organ during bud stage will result in what?
supernumerary teeth
what will the center of enamel organ (stellate reticulum) do during cap stage?
supports and protects the ameloblasts
during early bell stage, basic form and relative size is established by _______________
differential growth
T/F: Differentiation of odontoblasts from dental papilla comes AFTER differentiation of ameloblasts from inner epithelium
FALSE. Odontoblasts precede ameloblasts
at what morphologic stage does the future DEJ get outlined?
this was accentuated during the review
advanced bell stage
the basal margin of the enamel organ gives rise to ____________ which loses continuity once first layer of dentin is laid down
Hertwig’s epithelial root sheath
first deposition of enamel? last?
incisal to cervical
what are the two stages of formation of enamel?
- immediate partial mineralization as matrix segments are formed
- Maturation
what happens as soon as the dento-enamel junction is completed
beginning of enamel/dentin deposition
what are the incremental lines of regular and rhythmic deposition of matrix of hard dental structures?
Lines of Retzius
which primary tooth does not resemble any of the permanent teeth?
accentuated during the review
primary mandibular first molar
what does the mandibular second primary molar resemble?
the permanent first mand molar
what does the primary max second molar resemble?
the max 1st permanent molar