Which is the correct order?
Bud, cap, placode, bell, root
bud, bell, cap, root, placode
placode, bud, cap, bell, root
placode, cap, bud, bell, root
bud, placode, cap, bell, root
Which of the following is correct about the primary epithelial band
Thickening of the oral epithelium seen at 7th week
Tooth formation is limited mesiodistally
Becomes dental lamina upon invasion of the ectomesenchyme
becomes lamina and thickens at 7th week
all of the things
Which of the following is incorrect?
The primary epithelial band forms both the dental and vestibular lamina
The dental lamina comes from the dental placode
There are 16 dental placodes per arch
Thickening at the primary epithelial band indicates formation of future teeth
SHH and PITX2 are expressed in the primary epithelial band
During the cap stage, which of the following occurs?
Positively charged proteoglycans are formed to attract water
Lots of mitosis for formation of cervical loop
Epithelial cells form outer enamel
proteoglycans and mitosis
proteoglycans and enamel
Which of the following is incorrectly matched?
enamel organ... cell rest of Malassez
dental papilla... pulp tissue
dental follicle... periodontal ligament
dental papilla... junctional epithelium
dental follicle... alveolar bone
Enamel pearls can form during the late bell stage
Enamel knots do not divide and are organizing centers for cusp formation
The major protein of dentin is type 3 collagen
All of the above
Type 3 collagen and enamel knots
All succedaneous teeth form from lingual extensions of the dental lamina. Molars also develop from lingual extensions of the dental lamina
Both true
True, False
False, True
Both false
Which of the following is false?
Some of the cervical loop cells form cell rests of Malassez
The periodontal ligament is a special ligament made from epithelial cells
Some Hertwig's epithelial root sheath cells become epithelial cell rests of Malassez
None of the above
Epithelial-mesenchymal interactions induce dentinogenesis, root morphogenesis, and cementum formation
Mo SHH, mo cusps? Insulin-like growth factor is associated with Hertwig's epithelial root sheath?
True, false
False, true
FGF4 is involved in Hertwig's epithelial root sheath formation. FGF10 is involved in cusp formation
According to the Homeobox Code Theory, BMP4 and FGF 8/9 ratios determine tooth type. Anterior-posterior axis set by PMP4 posteriorly and FGF 8/9 anteriorly.
In homeobox theory, signaling molecules determine tooth type and axis within primary epithelial band. Clone theory states that clones give inhibitory signals to stop formation of additional teeth
Dental follicle...osteoblasts
Dental papilla... odontoblasts
Enamel organ... cementoblasts
Dental follicle... fibroblasts
