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)
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1
Q

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

A

12

2
Q

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

A

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

3
Q

Lay down an organic matrix that forms enamel

A

Ameloblast

4
Q

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

A

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

5
Q

Primary dentition: Earliest to calcify

A

Maxillary central incisor at 3-4 month in utero

6
Q

Primary dentition: Last to calcify

A

Maxillary second molar at 6 months in utero

7
Q

Permanent dentition: Earliest to erupt

A

Mandibular central incisor at 6-7 years

8
Q

Permanent dentition: Last to erupt

A

Third molar at 17-21 years

9
Q

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)

A

Anodontia

10
Q

Teeth that are most commonly absent

A

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

11
Q

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

A

Supernumerary teeth

12
Q

MC location of supernumerary teeth

A

Between maxillary central incisors

13
Q

2 teeth joined together

A

Twinning

14
Q

Twinning is most often observed where

A

Mandibular incisors of the primary dentition

15
Q

Twinning can result from 3 phenomena

A

1) Gemination 2) Fusion 3) Concrescence

16
Q

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

A

Gemination

17
Q

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

A

Fusion

18
Q

Single wide crown supported on 2 roots

A

Fusion

19
Q

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

A

Concrescence

20
Q

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

A

Concrescence

21
Q

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

A

Amelogenesis imperfecta

22
Q

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

A

Amelogenesis imperfecta

23
Q

T/F Susceptibility to caries is low in Amelogenesis Imperfecta

A

T

24
Q

Main problem in amelogenesis imperfecta

A

Enamel is subject to destruction from abrasion

25
Q

Management of amelogenesis imperfecta

A

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

26
Q

Odontoblasts fail to differentiate normally resulting in poorly calcified dentin

A

Dentinogenesis imperfecta

27
Q

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

A

Dentinogenesis imperfecta

28
Q

Opaque white patches or horizontal lines on the tooth

A

Hypocalcification

29
Q

Pitting or areas devoid of enamel

A

Hypoplasia

30
Q

Mottled enamel

A

Fluorosis

31
Q

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

A

> 0.05mg/kg/day

32
Q

Fluorosis can be caused by

A

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

33
Q

Fluorosis presents clinically as

A

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

34
Q

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

A

5.0ppm

35
Q

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

A

Hyperbilirubinemia

36
Q

Produces red-brown discoloration of teeth

A

Porphyria

37
Q

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

A

Tetracyclines

38
Q

Cause teeth to fluoresce under UV light

A

Tetracyclines

39
Q

Period at risk for discoloration and hypoplasia due to tetracycline use

A

4 months of gestation to 7 years of life

40
Q

Conditions associated with delayed eruption of the 20 primary teeth

A

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

41
Q

Premature loss of primary teeth is MCC by

A

Premature eruption of permanent teeth

42
Q

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

A

1) Precocious puberty 2) Hyperthyroidism

43
Q

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

A

Mandibular central incisors

44
Q

Teeth that are present at birth

A

Natal teeth

45
Q

Teeth that erupt in the 1st month of life

A

Neonatal teeth

46
Q

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

A

Natal and neonatal teeth

47
Q

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

A

T

48
Q

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

A

T

49
Q

Exfoliation failure occurs most commonly in what region

A

Mandibular incisor