Tooth morphology primary dentition Flashcards
When does primary dentition development begin?
7 weeks in utero
When does primary eruption begin
6 months of age
When is primary eruption complete
2.5 years of age
Primary dentition teeth
20 teeth: 10 maxillary and 10 mandibular
4 incisors
2 canines
4 molars
Tooth eruption and exfoliation Lower A
Central incisor
Eruption 6-10 month
Exfoliate 6-7 yrs
Exfoliation is a varied time frame
Lower incisors eruption
6 months
6-12 months
all incisors erupt
12-18 months
Incisors and 1st molars
18-36
C’s and e’s erupt
Canines and second molars
Natal teeth
Born with tooth or first weeks
Usually lower A’s
Usually wobbly, no roots just crown
May cause ulcer underneath tongue
Eruption cyst
Dentigerous cyst
Over follicle of tooth as its erupting, not letting the tooth through
Primary teeth clincial
Caries progresses to pulp quickly as enamel and denting are thinner
Clinical significance primary
Less space for restorative bulk
Easier to expose the pulp
Filling more brittle, more likely to fail
Occlusal table primary
Narrow
Thin bucco lingually
So width needs to be reduced
Matrix band primary
Shorter clinical crowns
Difficult fitting matrix bands
Interproximal areas primary
Broad flat interprxomianl contact areas
Problems with caries diagnosis
Roots
Permanent successor is in the furcation of the primary one
Root clinical signifcance
Root canal difficult
Risk is some material/instrument goes into developing successor
High risk of fracturing primary tooth on extraction due to thin and splayed roots
Thin pupal floor and multiple canals significance
perforation risk
Inter radiuclar vs periapical lesions for permanent tooth
