9 - Development and Developmental Disturbances of the Teeth Part 1

Question 1

what are the components of tooth bud?

Answer 1

1. Enamel organ
2. Dental papilla
3. Dental Sac

Question 2

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

Answer 2

1. enamel organ : ameloblasts
2. Dental papilla: odontoblasts which produce dentin and mesenchymal cells that become pulpal tissue
3. Dental Sac: cementoblasts which produce cementum, osteoblasts which produce alveolar bone, and fibroblasts that produce PDL fibers

Question 3

what are the morphologic developmental stages?

review said to know the difference between this and histophysiologic

Answer 3

• Dental lamina
• bud stage
• cap stage
• early bell stage
• advanced bell stage

Question 4

what are the histophysiologic developmental stages?

review said to know the difference between this and histophysiologic

Answer 4

• Initiation
• proliferation
• histodifferentiation
• morphodifferentiation
• apposition
• minteralization
• maturation

Question 5

when does the dental lamina begin development?

review said ‘ages that these stages are happening at is important’

Answer 5

6 weeks of embryonic age

Question 6

what is epithelial thickening in region of the future dental arch

Answer 6

Primordium

Question 7

what does primordium result in?

Answer 7

ectodermal portion of teeth

Question 8

what is considered initial formation of dental development?

Answer 8

dental lamina

Question 9

T/F Permanent molars will arise from the dental lamina simultaneously with the primary teeth

Answer 9

False. permanent molars arise separately from the dental lamina

Question 10

if there is a lack of initiation or arrest in proliferating cells during the bud stage what will this result in?

Answer 10

congenitally missing tooth/teeth

Question 11

improper continuation of budding of the enamel organ during bud stage will result in what?

Answer 11

supernumerary teeth

Question 12

what will the center of enamel organ (stellate reticulum) do during cap stage?

Answer 12

supports and protects the ameloblasts

Question 13

during early bell stage, basic form and relative size is established by _______________

Answer 13

differential growth

Question 14

T/F: Differentiation of odontoblasts from dental papilla comes AFTER differentiation of ameloblasts from inner epithelium

Answer 14

FALSE. Odontoblasts precede ameloblasts

Question 15

at what morphologic stage does the future DEJ get outlined?

this was accentuated during the review

Answer 15

advanced bell stage

Question 16

the basal margin of the enamel organ gives rise to ____________ which loses continuity once first layer of dentin is laid down

Answer 16

Hertwig’s epithelial root sheath

Question 17

first deposition of enamel? last?

Answer 17

incisal to cervical

Question 18

what are the two stages of formation of enamel?

Answer 18

1. immediate partial mineralization as matrix segments are formed
2. Maturation

Question 19

what happens as soon as the dento-enamel junction is completed

Answer 19

beginning of enamel/dentin deposition

Question 20

what are the incremental lines of regular and rhythmic deposition of matrix of hard dental structures?

Answer 20

Lines of Retzius

Question 21

which primary tooth does not resemble any of the permanent teeth?

accentuated during the review

Answer 21

primary mandibular first molar

Question 22

what does the mandibular second primary molar resemble?

Answer 22

the permanent first mand molar

Question 23

what does the primary max second molar resemble?

Answer 23

the max 1st permanent molar