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when does root development start?
when the crown is complete and erupting
what is the cervical loop made of?
inner enamel epithelium and outer enamel epithelium squished together (no stellate rticulum or stratum intermedium)
once the cervical loop extends deeper into the ectomesenchyme what does it become?
hertwing's epithelial root sheath (HERS)
how is dentin formed along the root?
- HERS induces dental papilla to differentiate into odontoblasts
- Odontoblasts leave the dentin matrix
- HERS disintegrates
what are epithelial rests of Malassez
HERS that didn't disintegrate and get lost, they can become cystic and cause problems
What can't enamel form in the root?
without the stratum intermedium and stellate reticulum the ameloblasts cannot form
what induces cells of the dental sac to become cementoblasts?
what is the only slimy trail (matrix) to have a name?
what are the cementoblasts cell bodies called and where do they leave it?
- within the matrix
through _____ the dental papilla now forms into the ___ of the tooth.
the ectomesenchyme from the dental sac ____ into the _____ ____ adjacent to the cementum
- periodontal ligament
the ectomesenchyme from the___ ___ differentiates into the ____ ___ surrounding each tooth.
what does the periodontal ligament anchor into?
cementum and alveolar bone
how are multirooted teeth formed?
cervical loop splits into multiple roots
what are the developmental disturbances during root formation?
- enamel pearls
- accessory roots
what is it when the ameloblasts get lost and start forming enamel in abnormal places?
what is it called when two teeth get stuck together by cementum?
what is it called when because of injury or pressure the HERS get distorted and make the roots bend?
what is an accessory root?
extra roots because of injury pressure or metabloic disease of HERS
what kind of eruption is actual vertical movement of the tooth?
what kind of eruption is it when gingiva recedes around tooth?
what is reduced enamel epithelium and what does it do?
- enamel organ squished together
- REE fuses with the oral epithelium and disintegrates it to make a tunnel for eruption
what two kinds of cells are needed for primary tooth shedding?
what cell dissolves the bone around the tooth in primary tooth shedding?
what cell dissolves the roots of the tooth in primary tooth shedding?
What happens when the primary tooth is not quite ready to come out?
osteoblasts, odontoblasts and cementoblasts replace the reabsorbed bone and root. That is why kids teeth will feel really loose and then suddenly tighten up again
what is the nasmyth's membrane?
left over REE and oral epithelium that sticks to the newly erupted teeth and catches stain
how do you remove the nasmyth's membrane?
all succedaneous teeth form and erupt _____ to the primary teeth except the maxillary incisors that erupt _____ to the primary teeth.
what are the two types of developmental disturbances during eruption?
- dentigerous cyst
- eruption cyst
what is a dentigerous cyst?
the REE forms a cyst around the completely formed crown. it can displace teeth and cause pain and must be removed surgically
what is an eruption cyst?
a dentigerous cyst formed around the developing crown. when the tooth erupts it will go away
What developmental disturbance during eruption is around a completely formed crown?
what developmental disturbance during eruption is around a developing crown?
true/false. a dentigerous cyst will go away on its own when it erupts?
false, a dentigerous cyst must be removed surgically
true/false. a eruption cyst must be removed surgically.
false a eruption cyst will go away on its own when the tooth erupts
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