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Flashcards in Chronology of Tooth Eruption Deck (17)
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What common problems may arise before teeth erupt

Gingival cysts (Epstein’s Pearls/Bohns Nodules)
Congenital Epulis
Natal or Neonatal teeth
Eruption cysts


Describe gingival cysts and how to treat them

White and formed of keratin
Don’t need to worry about them - just keep them under observation


Describe congenital epulis and if it needs treated

Very large expulsion in the mouth that may interfere with feeding
If not interfering or traumatising you can leave it alone but sometimes they do need treatment


What are natal and neonatal teeth

Natal - teeth that are there at the time of birth
Neonatal - teeth that come through in the early few days and weeks of life
Usually the lower primary central incisors


When do natal or neonatal teeth require treatment

If causing an ulcer, if they are very mobile or if they are a danger to the baby’s airway


Describe eruption cysts and how they are treated

Cyst that’s overlying where the developing tooth is about to erupt
Blue because it’s filled with blood
Don’t need to do anything about these they will resolve as the tooth erupts usually


Describe the FDI notation for primary teeth

Quadrants are numbered 5,6,7 and 8 rather than 1,2,3 and 4


When do teeth start to form

Week 5 of iul


When can the first tooth be detected on an ultrasound scan

Week 13 iul


Describe the timeline of development of a maxillary central incisor

Starts calcification at 13-16 weeks iul
Crown complete 1.5 months after birth
Eruption 8-12 months
Root complete 33 months


Describe the timeline of development of a maxillary second primary molar

Calcification at 16-23 weeks iul
Crown formation complete 11 months after birth
Eruption between 25-33 months
Complete root formation 47 months


Why are calcification dates important to know

Systemic disturbances during calcification can lead to defects in the enamel which was forming at that time
Defects in the primary dentition are mostly likely the result of a difficult pregnancy for the mother or complications at birth


What is the level of calcification for each tooth at birth

1/2 of central incisors
1/3 of lateral incisors
Tip of primary canines
1/2 of first primary molars
1/3 of second primary molars
Tip of cusps of first permanent molars


What is required for tooth eruption to occur

A force must be generated to propel the tooth through the bone and gingival tissue
In the permanent dentition, the primary tooth root must also be removed in some cases


What are the possible theories behind tooth eruption

Cellular proliferation at the apex of the tooth
Localised change in blood pressure/hydrostatic pressure
Metabolic activity within the PDL
Resorption of the overlying hard tissue


Describe the relationship between tooth eruption and resorption of the bone

Remodelling of bone is essential for tooth eruption to occur
But tooth eruption doesn’t necessarily cause the bone to resorb


What role does the dental follicle play in tooth eruption

Follicle is activated to initiate osteoclastic activity in the alveolar bone ahead of the tooth and a clear path for tooth eruption