Chronology of Tooth Eruption Flashcards
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
