Dental Development

Question 1

when do teeth develop between

Answer 1

• teeth start forming in week 5 of embryonic life

- continues until roots of third molars are completed at 20

Question 2

look on slides for importance of dental development and abnormalities of tooth form, size and structure at various stages of tooth development

Answer 2

look at slides

Question 3

developmental dates primary dentition

Answer 3

slides

Question 4

developmental dates permanent dentition

Answer 4

slides

Question 5

why is it important to know developmental dates

Answer 5

• 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

Question 6

when do the primary mandibular centrals, maxillary centrals, maxillary laterals and mandibular laterals erupt in kids

Answer 6

• lower as- 6 or 7 months
• upper as- 10 months
• upper bs 11 months
• lower bs- 13 months

Question 7

when do primary cs, ds and es erupt

Answer 7

• c’s erupt at 19 months
• d’s at 16 months
• e’s at 27-29 months with lowers erupting before maxillary usually

Question 8

what are common occlusal features of primary dentition

Answer 8

• incisor teeth tend to be spaced. this prevents permanent teeth from crowding
• ‘anthropoid space’

Question 9

what can you say about lower e compared to upper es

Answer 9

• lower e is much longer mesiodistally than upper e

- teeth are in same vertical plane which is known as flush terminal plane

Question 10

what can u say about incisor relationship in primary dentition

Answer 10

• more edge to edge
• maxillary incisions tend to be more upright
• sometimes anterior open bite of sucking habit

Question 11

what is leeway space and what is the value

Answer 11

• 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)

Question 12

eruption of primary dentition v permanent dentition

Answer 12

primary dentition erupts more or less continuously over a 2 year period
permanent dentition erupts in stages

Question 13

when does mandibular 1s erupt

Answer 13

6 years

Question 14

when does mandibular 6s erupt

Answer 14

6 years

Question 15

when do maxillary 1s and lower 2s erupt

Answer 15

7 years

Question 16

when do upper 2s erupt

Answer 16

8 years

Question 17

what may u notice about maxillary permanent incisors when they erupt

Answer 17

• incisors may be spaced

- lateral incisors have a distal inclination

Question 18

what if a maxillary lateral erupts before central

Answer 18

-something impeding eruption of central eg. supernumerary, history of dental trauma, pathology

Question 19

when do mandibular canines and first premolars erupt

Answer 19

-around 10 years of age

Question 20

when should u palpate buccal sulcus and why

Answer 20

• maxillary canine closely associated with distal aspect of lateral incisor
• should be palpated clinically high in buccal sulcus from age 10

Question 21

when should you investigate discrepancies

Answer 21

• dentitions falling substantially outside range of tooth eruption
• individual teeth delayed by 6 months