Tooth Eruption Flashcards
Where are the primary and secondary Incisors in relation to one another during pre-eruption?
Secondary tooth starts out lingual and at the incisal level of the primary. When primary erupts, Secondary is now at apical 1/3 level and lingual to the primary.
Where are the primary and secondary Premolars in relation to one another during the pre-eruption phases?
Secondary is lingual and even with primary tooth pre-eruption. As primary tooth erupts, Secondary sits right underneath it.
Where are permanent molars during the pre-eruptive and erputive phases compared to primary ?
There are no primary molars to follow.
What are succedaneous and nonsuccedaneous teeth?
Succ=teeth that move into a postion formally occupied by a primary tooth (incisors, canine, bicuspids (premolars).
Non=Have no primary tooth to follow. (Molars)
What happens during the pre-eruptive functional phase of eruption?
Reduced enamel epithelium fuses with oral epithelium and will later become the junctional epithelium. CT degenerates, nerve fibers break, osteoclast resorb bone.
What is the Gubernacular cord?
cord of cells that create an eruption pathway for a tooth.
What is the Fundic Region? Function?
Area cervical to developing root that forms calcified trabeculase in a ladder fashion under the tooth. Helps tooth erupt.
what happens during the functional eruptive stage?
- Teeth are in occlusion
- height of Alveolar process increases
- Fundic plates resorp
- Root canal narrow.
How long does it take for roots to take form for primary and secondary teeth?
Primary=1-1.5 years
Secondary=2-3 years
What is the rule of four for primary tooth eruption?
4 teeth every 4 moths starting with 4 teeth at 7 months.
What is leeway space?
Widths of Primary Molars are greater than the widths of permanent molars coming in, which leaves space
When do primary mandibular central incisors erupt? Lateral?
Central=6 Months
Lateral=7 Months
When do Primary Maxillary central incisors erupt? Lateral?
Central=7.5 Months
Lateral=9 Months
When do Primary Mandibular 1st Molars Erupt? Maxillary 1st molars?
Man=12 Months
Max=14 Months
When do primary mandibular canines erupt? Maxillary?
Man=16 Months
Max=18 Months
When do Mandibular Primary 2nd molars erupt? Maxillary?
Man=20 Months
Max=24
