Dental Anatomy Facts Part 3 Flashcards Preview

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Flashcards in Dental Anatomy Facts Part 3 Deck (62):
1

When the mandible moves from CO to edge to edge, what do the condyles do

Condyles move forward and downward

2

when the mandible moves from CO to edge to edge, what does the non-working condyle do

moves downward, forward, and medial

3

What plays the greatest role in discluding the posterior teeth in latero-protrusive movements

Anterior guidance

4

Teeth are in contact in intercuspal position during non masticatory swallowing or during masticatory swallowing

Non masticatory swallowing

5

What almost exclusively determines intercuspal position

Tooth contact

6

What is a tooth guided position and what is a ligament guided position

Tooth guided - Centric occlusion or intercuspal position
Ligament guided - Centric relation

7

In Posselt's envelope, what is the most superior point

Maximum intercuspal position = intercuspal position = CO

8

Bennet Movement

Side shift of the mandible toward the working condyle, the side it's moving to

9

When does Bennet movement occur

During the earliest stage of lateral movement

10

What is postural position

Physiological rest position
About 2mm lower than CO

11

Is Postral position a border position

no

12

Mandibular postral position determined almost exclusively by what

mandibular musculature

13

If you move from postral position to CO, use what muscle

Use anterior fibers of temporalis

14

Curve of Spee

the Anterior-posterior curvature of the occlusal surfaces as seen in a facial/buccal view
- think weeee, sliding down the teeth

15

Curve of Wilson

Curved bridge from left to right side inside the mouth

16

Overjet

Horizontal overlap
-Usual overjet is 2-4 mm
-think jet on the horizon

17

Overbite

Vertical overbite
-think, you bite up and down

18

The main component of enamel

inorganic matter
not collagen

19

Direction of enamel rods in permanent teeth in cervical third

Gingival direction or not towards the incisal/occlusal
rods in cervical third of deciduous teeth run incisal-cervically

20

Perikymata

Result from the normal enamel apposition - seen on outside surface
-Manifestation of striae of Retzius on enamel surface

21

Striae of Retzius

Developmental disturbances inside tooth in the enamel
-run obliquely from DEJ to enamel surface

22

For multi-rooted teeth, where does dentin most rapidly form

at the floor and roof of pulp chamber

23

Caries stimulates production of what

tertiary dentin

24

Percentage of dentin that is organic

20-30%

25

Primary function of dental pulp is

to form dentin
-not to nourish or provide sensation

26

What is the dentin and pulp formed from

Dental Papilla
-think D.P. - dental papilla and dentin pulp

27

Dentin that is most highly mineralized is

Intra or peritubular dentin
-Peritubular - right around the odontoblastic process
-INTERtubular dentin is in between two processes

28

The DEJ occurs at what two structures during development

dental papilla and inner enamel epithelium
-DP cells in contact with IEE = odontoblasts

29

Softest dental tissue

cementum

30

2 types of cementum, where are they

Acellular - coronal 2/3
-Cellular - apical 1/3, think that the cells are down where the blood supply is coming from

31

When viewed from the occlusal, the arrangement of the teeth are what shape,
however, the 4 or 5 posterior teeth are aligned in what shape

all teeth in parabolic shape
posterior teeth aligned in straight line

32

All teeth develop from how many lobes
What are the exceptions

All teeth develop from 4 lobes
-Except permanent first molars - 5 lobes
-And mandibular 2nd premolar 3 cusp type - 5 lobes

33

Marginal ridges of mand first premolar

mesial marginal ridge more cervical than the distal

34

All teeth have distal and mesial marginal ridges - true or false

true

35

What separates cusp ridges from marginal ridges

developmental grooves

36

Union of a facial and lingual triangular ridge

Transverse ridge

37

How many teeth in permanent dentition normally have a cingulum, which are they

All 12 anterior teeth

38

What percent of the total F-L dimension is made up by the occlusal table of posterior teeth

55-65%

39

What makes up the periodontium

Gingiva, PDL, Cementum, Alveolar bone (junctional epithelium is often included)
-epithelial attachment - junctional epithelium

40

How wide is PDL normally and with age

PDL is 0.2 mm wide
-Old age decreases to 0.1 due to deposition of cementum and bone

41

Attachments of PDL fibers

tooth (cementum) to dental alveolar bone

42

Attachments of gingival fibers

tooth (cementum) to gingiva

43

What is the predominant connective tissue for PDL fibers

Type 1 collagen

44

What fibers provide the major support for a tooth during function

Oblique fibers

45

Which fiber reduces the likelihood of forceful impaction into alveolus

Oblique fibers

46

Group of fibers most likely found in middle third of root

Oblique fibers

47

Most prevalent type of PDL fiber

Oblique fibers

48

Transseptal fibers are PDL or gingival fibers

Gingival fibers

49

Attachments of transseptal fibers

Tooth to tooth

50

About how much of permanent root is formed when tooth erupts

50%

51

When is the apex of a tooth fully formed after it erupts

about 2-3 years

52

Function of the pulp

form dentin - primary function
-supply nutrients to dentin
-transmit sensory stimuli

53

Which teeth have facial heights of contour in cervical third

All except mandibular molars

54

Lingual heights of contour found where

Anterior teeth - cervical third
-Posterior teeth - middle third except MD 2nd premolar is in occlusal third

55

Location of lingual height of contour on mand 2nd premolar

occlusal third

56

Where is the greatest depth of curvature of the cervical line of permanent teeth

Mesial aspect

57

Where does the CEJ dip deeper

Ant teeth than post
Max than mand
Mesial than distal
Greatest on mesial of max central incisor

Think max central incisor as model for all of these

58

Supernumerary teeth commonly where

between maxillary centrals
or as a 4th molar sometimes

59

Concrescence

when cementum of two teeth join together

60

Oligodontia

presence of fewer than normal teeth - 6?

61

Which aspect of mand central opposes the which part of max central

distoincisal aspect of mand central opposes lingual fossa of max central

62

Exceptions to picket fence drawing

Lingual cusps of max premolars contact the distal fossa of respective mand premolars because of mesial slant of lingual cusp
(max 2nd premolar lingual cusp contacts distal fossa of mand 2nd premolar)

In a cusp to fossa contacting relationship in ICP, max first premolar is most likely to articulate with mand first premolar - this is due to lingual inclination of max first premolar. Mand second premolar is not involved in cusp to fossa manner