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Dental Anatomy > Misc Questions > Flashcards

Misc Questions Flashcards

1
Q

Dentin most regular in structure is ……..

A

primary dentin

* followed by secondary & tertiary dentin

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2
Q

Talon cusp refers to ……

A

the distolingual cusp of Max. molars

  • becomes less conspicuous as we go from first to third molar
  • The order of size of the cusps in molars from largest to smallest: ML, MB, DB, DL, Carabelli
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3
Q

Which teeth oppose only one tooth in the permanent dentition?

A
  1. Lower centrals oppose the upper centrals only
  2. Upper third molars oppose the lower third molars only
    * Lower third molars oppose the upper second and third molars
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4
Q

The premolar that is most like a molar is …..

A

Mand. second premolar

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5
Q

Distal curvature of roots in Mand. molars is more pronounced in ………

A

mesial root

  • distal root is straight
  • Also, the mesial root has a proximal concavity, which may separate the mesial root in two roots. This is not the case with the distal root (which also may have a concavity)
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6
Q

The most vertical tooth in the mouth is …….

A

Max. central incisor

* Note that: the lateral incisor is mesially inclined. The Max. canine is distally inclined, so is the first molar

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7
Q

The buccal cusp of the Mand. first premolar occlude in ……

A

the mesial marginal ridge of the counterpart only (barely touches the Max canine)

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8
Q

A cross section of the Max. canine at the cervical line level shows ………

A

an oval shape, with slightly wider labial surface

* Same for the Mand. canine

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9
Q

Anodontia and oligodontia may be caused by ………

A

ectodermal dysplasia

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10
Q

If the Mand. first molar would have a third root in a rare cases, that root would be ……..

A

a distal root

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11
Q

A cross section of the Max. lateral incisor at the cervical line level shows ………

A

round cross section (same for the central)

  • Note that: the pulp chamber shape from this level upward is flattened buccolingually to follow the crown profile
  • Mand. centrals and Max. & Mand. canines have oval pulp cross section (wide buccolingually)
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12
Q

The last tooth to calcify is ……., which occur at about …….
No tetracyclin for children under that age

A

third molars

8 years

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13
Q

Nasmyth’s membrane, or ( ….. ) is …..

A

inner enamel cuticle
final layer laid down by the ameloblasts on the enamel surface (it is acellular & adherent)
* The cuticle is covered by another acellular layer from the dental sac.
* Those layers are found only during the eruption period, then they wear away

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14
Q

The zygomatic process is the result of fusion of …….

A

the temporal & zygomatic bones

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15
Q

Contact of the Mand. lateral incisor with the Mand. canine is at …….

A

incisal third (their height of contour is at the incisal third)

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16
Q

Dens in dent is ……

A

malformation most likely resulting from an infolding of the dental papilla during tooth development or invagination of all layer of the enamel organ in dental papillae.
* Most affected tooth is the Max. lateral incisor

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17
Q

The premolar viewed from the facial, has a longer mesial cusp ridge than distal cusp ridge is …..

A

Max. first permolar

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18
Q

Teeth that are least likely to get caries are ……..

A

Mand. anterior teeth

  • due to: tongue cleansing action, abundant saliva, and mostly smooth surface
  • Normally, the last tooth in the mouth is the Mand. canine
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19
Q

Marrow space in the alveolar bone is usually …….

A 
yellow marrow (fat)
* Red marrow exists in the ramus &  condyle
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20
Q

The lingual ridge is more pronounced on …….

A

the maxillary canine than on the mandibular

* The Max. canine has more distinct lingual anatomy

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21
Q

The tooth most likely to be successfully rotated during exodontia is the:……

A

Max. anterior teeth (especially the central)

* Mand. anterior teeth usually are flattened mesiodistally, so buccolingual movement is used instead of rotation

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22
Q

Two roots are a fairly rare occurrence in canines, but are occasionally found in ……

A

the mandibular canine

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23
Q

The most numerous cell type of the dental pulp is the ……

A

fibroblast

* Pulp is a connective tissue

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24
Q

Submucosa is always found beneath …….

A

lamina propria

* Never between the epithelium & lamina propria

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25
Q

The distolingual cusps of the Mand. molars occlude in …..

A

the lingual groove of their Max. counterparts

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26
Q

Oblique ridges are characteristic of ………..

A

Max. molar teeth

* They connect the mesiolingual and distobuccal cusps

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27
Q

The Mand. first molar mesial root may feature a ………

A

deep root concavity

* Note that: the distal root might have a slight depression. But the mesial root is characterized by this concavity

28
Q

Odontoblasts laying down dentin matrix would have a large number of ………

A

RER

* Also, have a lot of mitochondria

29
Q

The pterygoid fovea is located on ……….., and serves for the attachment of the …..

A

the medial surface of the condyle

* lateral pterygoid muscle.

30
Q

Mantle dentin is ……

A

the outer most layer of dentin next to DEJ

* Slightly less mineralized than primary dentin

31
Q

Human teeth is ……..

A

heterodent (different forms), diphyodont (two sets)

32
Q

The triangular ridge is ……..

A

a ridge on all post. teeth, extend from the cusp tip to the central groove

  • Note: the Max. molars ML cusp has two
  • Note: the transverse ridge connects two opposing buccal & lingual triangles
33
Q

Ant. teeth have …… line angels, while the post. have …….
All teeth have ….. point angles

A

6
8
4

34
Q

The proximal surface profile for all ant. teeth is ….., for the Max. post. is ……, and for the Mand. post. is ……

A

triangular
trapezoidal
rhomboidal

35
Q

Generally, facial height of contour is located in ……., except …….

A

cervical third
Mand. molars (junction of middle & cervical thirds)
* It is least prominent on Mand. incisors

36
Q

Generally, lingual height contour for ant. teeth is located in …….., and for post. teeth is ……, except …….

A

cervical third
middle third
Mand. PM2 (in the occlusal third)

37
Q

The Max. arch length is ……. than the Mand. arch

A

slightly longer (128 mm)

38
Q

The most variable tooth is ……

The most congenitally missing tooth is …..

A

third molar

  • Followed by Max. lateral (in the third place)
  • Same for missing tooth
39
Q

The tooth that has a distal concavity at the CEJ, making scaling difficult is ……..

A

Max. first molar

40
Q

The most common tooth to have enamel pearls is ……

A

third molar

* Enamel pearl is focal mass of enamel apical to the CEJ

41
Q

The only tooth that is wider lingually than buccally is ……

A

Max. first molar

42
Q

The premolar most congenitally missing is ……

A

Mand. PM2

43
Q

How many cusps can be seen from the buccal view of the Mand. first molar?

A

5

44
Q

How many transverse ridges does the Mand. first & second molars have?

A

2

45
Q

The primate space is ……

A

the natural space between primary teeth. Usually between the Max. lateral incisor and the canine, and the Mand canine & the first molar

46
Q

The widest primary tooth in B-L dimension is …..

A

second molar

47
Q

The most unique primary tooth is ….

A

Mand. first molar

  • Note: it has no central fossa, only two M & D triangular fossa
  • The most difficult tooth to restore
48
Q

What is the classification for pulp canals?

A
  1. Class I: regular
  2. Class II: two canals leaving the chamber, later merge to exit in one canal
  3. Class III: two canals leaving the chamber, and leave the apex in two separate foramen
  4. Class IV: one canal leave the chamber, bifurcates later exiting in two foramen
49
Q

Tooth eruption usually starts when the root is ……

A

50% complete

  • Note: girls teeth erupt before boys
  • Teeth erupt in pairs
  • Mand. before Max.
50
Q

Mixed dentition starts with …… and ends with …..

A

eruption of first molar
exfoliation of primary Max. canine
* From 6 to 12 years

51
Q

Working and non working cusps order is reversed in case of ……..

A

cross bite occlusion

52
Q

The function of the temporomandibular ligament is …..

A

prevent posterior inferior displacement of the condyle

53
Q

Mesiodens is …..

A

a supernumerary tooth between the Max. central incisors

54
Q

Dilaceration is ……

A

a bend in the root of a tooth

55
Q

Taurodontism is ……..

A

a condition in molars where the body of the tooth and pulp chamber is enlarged vertically at the expense of the root.
Usually in Klinefelter syndrome, Down’s & amelogenesis imperfecta

56
Q

Dens evaginatus is …….

A

a projection in the crown. Example is Talon cusp in the lingual surface of Max. lateral incisor

57
Q

Concrescence is …..

A

Fusion of two completely formed teeth at their roots; must have confluent cementum

58
Q

Tooth fusion is ……

A

fusion of two unique tooth buds; must have confluent dentin. Severity depends on the stage of tooth development at which the fusion occurs

59
Q

Gemination is ….

A

Development of two crowns from one tooth bud; share a single root and root canal

60
Q

Wear facets develop at …… of Max. incisors & canines; and …….. of Mand. canines

A

L-I edge

F-I edge

61
Q

The function of the buccinator is ……

A

push the food under the molars
* It is originated from the pterygomandibular raphe & both alveolar processes. Its fibers crisscross & insert into the both muscles of the lips

62
Q

The mesial pulp horn in primary teeth is …. than the distal

A

larger

63
Q

The mesial marginal ridge is more …… than the distal on the Mand. first premolar

A

cervical

* Unique to this tooth

64
Q

Cementum is deposited ………… tooth eruption

A

before, during & after

65
Q

Peritubular dentin is ……. mineralized than intertubular dentin

A

more (higher inorganic content)

* Also, less water, and stains lighter

66
Q

The wavy S shape of the dentinal tubule is due to …….

A

decreasing the amount of space available for the tubules as they get longer and more interior

Dental Anatomy (14 decks)

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