Ch. 307 - Development and Developmental Anomalies of the Teeth Flashcards Preview

Nelson - The Digestive System > Ch. 307 - Development and Developmental Anomalies of the Teeth > Flashcards

Flashcards in Ch. 307 - Development and Developmental Anomalies of the Teeth Deck (49):
1

Primary teeth form in dental crypts by ___ weeks of fetal life

12

2

The permanent 1st, 2nd, and 3rd molars arise from buds that develop at approximately __, ___, and ___

4 mos of gestation, 1 yr of age, 4-5 yr of age

3

Lay down an organic matrix that forms enamel

Ameloblast

4

Calcification of primary teeth begins at ___ and concludes at ___ with mineralization of the 2nd primary molars

3-4 months in utero; postnatally at approximately 12 months

5

Primary dentition: Earliest to calcify

Maxillary central incisor at 3-4 month in utero

6

Primary dentition: Last to calcify

Maxillary second molar at 6 months in utero

7

Permanent dentition: Earliest to erupt

Mandibular central incisor at 6-7 years

8

Permanent dentition: Last to erupt

Third molar at 17-21 years

9

Occurs when no tooth buds form as in ectodermal dysplasia or when there is a disturbance of a normal site of initiation (e.g. area of a palatal cleft)

Anodontia

10

Teeth that are most commonly absent

1) 3rd molars 2) Maxillary lateral incisors 3) Mandibular 2nd premolars

11

Occurs when the dental lamina produces more than the normal number of buds

Supernumerary teeth

12

MC location of supernumerary teeth

Between maxillary central incisors

13

2 teeth joined together

Twinning

14

Twinning is most often observed where

Mandibular incisors of the primary dentition

15

Twinning can result from 3 phenomena

1) Gemination 2) Fusion 3) Concrescence

16

Result of the division of 1 tooth germ to form a bifid crown on a single root with a common pulp canal

Gemination

17

Joining of incompletely developed teeth that, owing to pressure, trauma, or crowding, continue to develop as 1 tooth

Fusion

18

Single wide crown supported on 2 roots

Fusion

19

Attachment of the roots of closely approximated adjacent teeth by an excessive deposit of cementum

Concrescence

20

Type of twinning that is found most often in the maxillary molar region

Concrescence

21

Group of hereditary conditions that manifest in enamel defects of the primary and permanent teeth without evidence of systemic disorder

Amelogenesis imperfecta

22

Teeth are covered by only a thin layer of abnormally formed enamel through which yellow underlying dentin is seen

Amelogenesis imperfecta

23

T/F Susceptibility to caries is low in Amelogenesis Imperfecta

T

24

Main problem in amelogenesis imperfecta

Enamel is subject to destruction from abrasion

25

Management of amelogenesis imperfecta

Complete coverage of the crown for dentin protection, to reduce tooth sensitivity, and for improved appearance

26

Odontoblasts fail to differentiate normally resulting in poorly calcified dentin

Dentinogenesis imperfecta

27

Enamel-dentin junction is altered, causing enamel to break away

Dentinogenesis imperfecta

28

Opaque white patches or horizontal lines on the tooth

Hypocalcification

29

Pitting or areas devoid of enamel

Hypoplasia

30

Mottled enamel

Fluorosis

31

Fluorosis can result from systemic fluoride consumption ___ amount during enamel formation

>0.05mg/kg/day

32

Fluorosis can be caused by

1) Residing in an area of high fluoride content of drinking water >2.0ppm 2) Swallowing excessive fluoridated toothpaste 3) Inappropriate fluoride prescriptions

33

Fluorosis presents clinically as

Inconspicuous white, lacy patches on the enamel to severe brownish discoloration and hypoplasia

34

Severe brownish discoloration and hypoplasia in severe fluorosis are usually seen with fluoride concentrations in the drinking water > ___

5.0ppm

35

Neonatal condition that can produce blue to black discoloration of the primary teeth

Hyperbilirubinemia

36

Produces red-brown discoloration of teeth

Porphyria

37

If administered during the period of enamel formation, this can result in brown-yellow discoloration and hypoplasia of enamel

Tetracyclines

38

Cause teeth to fluoresce under UV light

Tetracyclines

39

Period at risk for discoloration and hypoplasia due to tetracycline use

4 months of gestation to 7 years of life

40

Conditions associated with delayed eruption of the 20 primary teeth

1) Familial 2) Hypopituitarism 3) Hypothyroidism 4) Cleidocranial dysplasia 5) Trisomy 21

41

Premature loss of primary teeth is MCC by

Premature eruption of permanent teeth

42

If the entire dentition is advanced for age and sex, ___ or ___ should be considered

1) Precocious puberty 2) Hyperthyroidism

43

Natal teeth are observed in approx 1 in 2000 newborns in the position of the

Mandibular central incisors

44

Teeth that are present at birth

Natal teeth

45

Teeth that erupt in the 1st month of life

Neonatal teeth

46

Teeth whose attachment are limited to the gingival margin, with little root formation or bony support

Natal and neonatal teeth

47

T/F A radiograph can differentiate between a supernumerary and prematurely erupted primary tooth

T

48

T/F A family history of natal or premature eruption is present in affected children

T

49

Exfoliation failure occurs most commonly in what region

Mandibular incisor