Dental Development Flashcards
when do teeth develop between
- teeth start forming in week 5 of embryonic life
- continues until roots of third molars are completed at 20
look on slides for importance of dental development and abnormalities of tooth form, size and structure at various stages of tooth development
look at slides
developmental dates primary dentition
slides
developmental dates permanent dentition
slides
why is it important to know developmental dates
- choice of restoration on primary teeth
- timing of radiograph for ortho
- timing of ortho
- impact of dental trauma on primary and permanent teeth
- effect of medical conditions on teeth
when do the primary mandibular centrals, maxillary centrals, maxillary laterals and mandibular laterals erupt in kids
- lower as- 6 or 7 months
- upper as- 10 months
- upper bs 11 months
- lower bs- 13 months
when do primary cs, ds and es erupt
- c’s erupt at 19 months
- d’s at 16 months
- e’s at 27-29 months with lowers erupting before maxillary usually
what are common occlusal features of primary dentition
- incisor teeth tend to be spaced. this prevents permanent teeth from crowding
- ‘anthropoid space’
what can you say about lower e compared to upper es
- lower e is much longer mesiodistally than upper e
- teeth are in same vertical plane which is known as flush terminal plane
what can u say about incisor relationship in primary dentition
- more edge to edge
- maxillary incisions tend to be more upright
- sometimes anterior open bite of sucking habit
what is leeway space and what is the value
- primary teeth in buccal segments have a larger combined mesiodistal width than the permanent teeth that replace them
- amount by which the combined size of a primary canine and primary molar teeth exceeds the combined mesiodistal widths of the permanent canine and premolars (1.5mm in maxillary arch, 2.5mm in mandibular arch)
eruption of primary dentition v permanent dentition
primary dentition erupts more or less continuously over a 2 year period
permanent dentition erupts in stages
when does mandibular 1s erupt
6 years
when does mandibular 6s erupt
6 years
when do maxillary 1s and lower 2s erupt
7 years
when do upper 2s erupt
8 years
what may u notice about maxillary permanent incisors when they erupt
- incisors may be spaced
- lateral incisors have a distal inclination
what if a maxillary lateral erupts before central
-something impeding eruption of central eg. supernumerary, history of dental trauma, pathology
when do mandibular canines and first premolars erupt
-around 10 years of age
when should u palpate buccal sulcus and why
- maxillary canine closely associated with distal aspect of lateral incisor
- should be palpated clinically high in buccal sulcus from age 10
when should you investigate discrepancies
- dentitions falling substantially outside range of tooth eruption
- individual teeth delayed by 6 months
