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Op Dent 1 > Day 1 Lecture 2 > Flashcards

Day 1 Lecture 2 Flashcards

1
Q

Periodontium

A

Gums and jaw

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2
Q

TMJ

A

Temperomandibular joint

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3
Q

Restorative + Prosthetic Dentistry

A

Repair and replace teeth

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4
Q

Baby teeth

A

Deciduous - 20

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5
Q

Incisors

A

Cut/shear food, phonetics function and aesthetics

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6
Q

Canines

A

Shear, tear, pierce food, longest roots and strategic position in arch, key to occlusion (protection) - allow lateral guidance

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7
Q

Premolars

A

Grinding, fine chewing

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8
Q

Molars

A

Multi-rooted, strong, grinding, crushing, chewing.

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9
Q

Clinical Crown

A

What you can see

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10
Q

Anatomical crown

A

where DEJ is and on

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11
Q

DEJ

A

dentin enamal juncture

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12
Q

Dentin strength

A

1/10 strength - second hardest bone in body

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13
Q

Enamel comp.

A

90-95% inorganic HA, 4-8% H20, 1-2% protein

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14
Q

HA

A

hydroxyapatite -a calcium phosphate

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15
Q

Enamel structure

A

striated - rods from ameloblasts

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16
Q

Ameloblasts

A

form enamel from DEJ, extinct after deposition. Epithelial origin

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17
Q

Dentin/pulp complex

A

Mesenchymal in origin, odontoblasts in pulp

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18
Q

Odontoblasts

A

Form dentin, still can make dentin throughout life - cell bodies line wall of pulp chamber

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19
Q

Enamel organization

A

teardrops, rods are 4-8 microns, rods surrounded by organic sheath (easily sheared). Head region and tail region are 5 microns wide/long respectively

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20
Q

Enamel crystals with fluoride

A

Fluorapatite

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21
Q

Crystalite direction in/around rods

A

parallel in rods, up to 65deg fro prism direction in periphery/tail

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22
Q

Gnarled enamel

A

Occurs at cervical (visible base) and incisal/occlusal (pointed, valley) areas

23
Q

Enamel properties

A

Hard brittle parallel to rod direction, rarely follows straight path. Low tensile strength perpendicular to rod direction (dentin is stronger in terms of tensile)

24
Q

Enamel fracture lines

A

interprismatic - don’t go into dentin. dentin acts as a cushion and the tooth doesn’t shatter as a result

25
Q

Isotropic

A

same in all directions

26
Q

Anisotropic

A

depends on direction (tooth)

27
Q

When is enamel subject to fracture

A

When unsupported by dentin

28
Q

Dentin comp.

A

50% vol HA (75% wt), 25% vol collagen (20% wt), 25% vol H20 (5%wt)

29
Q

Dentin tubules

A

extend from pulp chamber to DEJ. Related to cells that line pulpal wall

30
Q

Peritubular dentin

A

denser, has had a longer time to deposit (larger and near DEJ)

31
Q

Intertubular dentin

A

located between tubules, hasnt had much time to deposit

32
Q

Dentin tubules

A

channel for odontoblastic process, allows fluid movement and ion transport. Allows remineralization, apposition of p. dentin, pain perception (perceived by nerves in pulp)

33
Q

Odontoblastic process

A

extension of odontoblast into dentin - cytoplasmic, aka tomes fibers

34
Q

Dentin structure

A

not uniformly mineralized (peritubular more than intertubular), principle organic component = collagen (toughness). HA crystals in collagen (smaller than enamel). 20% less hard than enamel, higher tensile strength, lower stiffness (more elastic). isotropic, cushion

35
Q

Predentin

A

Unmineralized zone of dentin immediately adjacent to cell bodies of odontoblasts

36
Q

Primary dentin

A

First dentin formed - forms up to 3 years after eruption

37
Q

Secondary dentin

A

Without any obvious stimulus, dentin direction changes and deposition slows.

38
Q

Reparative dentin (tertiary)

A

pulp fills in cavity in case of injury.

39
Q

Sclerotic dentin

A

Doesnt follow rules, like gnarled enamel, especially down in cervical area

40
Q

Dentin differ from Enamel

A

Less mineral content, small tubules for fluid (pain reception) and ion transport. Ability to repair or regenerate to physical or chemical response until pulp dies.

41
Q

Radiopaque

A

White on x-ray (enamel)

42
Q

Cementum

A

Periodontum - borders tooth. Slightly ligher in color than dentin. Lost as periodontium is lost (rarely seen in clinic, often brushed away).

43
Q

Periodontal Ligament - hold

A

Sharpeys fibers holds

44
Q

Cementum composition

A

5-10% mineral content. 45-50% inorganic (HA) by weight, 50-55% organic matter and water by weight (mainly collagen and protein polysaccharides). highest fluoride content of all mineralized tissue.

45
Q

Cementum structure

A

hard, avascular on anatomic roots. Formed continually throughout life, repair is limited as it is based on surrounding tissue (once it’s gone it is gone). Slightly softer than dentin, but permeable.

46
Q

Cementum origin

A

Formed by cementoblasts which develop from mesenchymal cells in connective tissue of dental follicle.

47
Q

Cementodentinal Junction (CDJ)

A

Attachment of cementum to dentin

48
Q

Cementoenamel Junction (CEJ)

A

Cervical line, where cementum joins enamel

49
Q

Dental Pulp functions

A

Formative/developmental, Nutritive, Sensory/Protective, Defensive/reparative

50
Q

Formative/developmental (pulp)

A

Production of primary and secondary dentin by odontoblasts

51
Q

Nutritive (pulp)

A

Supplies moisture and nutrients through blood to odontoblasts and their processes

52
Q

Sensory/Protective (pulp)

A

Provides nerve fibers to mediate pain (only response).

53
Q

Defensive/reparative (pulp)

A

Deposition of reparative dentin in response to stimuli. Inflammatory reaction to severe irritation - this can cause pulp death.

Op Dent 1 (17 decks)

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