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fixed > Developing Posterior Contours > Flashcards

Developing Posterior Contours Flashcards

1
Q

What do biological contours do

A

Stimulate natural healthy teeth
Protect the supporting tissues
Maintain the health of gingiva + periodontum
Minimize trauma and irritiation to bony tissue

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2
Q

What do Improper Contours do

A

Early breakdown of supportive structures

Early loss of teeth

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3
Q

Biologic Contour Check List

A 
Facial and LIngual convexities
Mesial and sital concavities
Transitional line
Contact area and embrasures
Cervical Curvatures
Marginal ridges
Tooth reduction
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4
Q

The greatest convexity on the axial surface of the crown

A

Crest of Curvature/ Height of Contour

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5
Q

What are the shapes a contour

A

Curved shape

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6
Q

Where are the curvatures unifrom when viewing a tooth from the mesial and distal aspect

A

the cervical and middle third

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7
Q

What does the proper degree of curvature allow for

A

Deflecting food over the gingival margin preventing irritiation
stimulation of soft tissue

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8
Q

What happens if the curvature is absent

A

Gingival tissue will driven Apically and will result in pathological changes

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9
Q

What happens if the curvature is too great

A

Gingiva is protected too much and loses gingival tone

Food and debris may back and lead to chronic inflammation

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10
Q

How far facial should something be contoured

A

1/2 mm facially beyond the CEJ

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11
Q

Where is the Height of Contour facially

A

in the cervical 1/3

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12
Q

How far should the lingual curve go

A

no more than 1/2 mm lingually beyond the CEJ

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13
Q

where si the Height of contour lingually

A

in the middle 1/3(except mandibular second premolars and molars which are3/4 to `1mm lingual

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14
Q

The tooth surface that is gingival to the height of contour and above the gingival crest

A

Emergence profile

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15
Q

The emergence profile

A

THe profile of the gingival 1/3 of a restoration as it emerges from the gingival crevice

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16
Q

What should the emergence profile look like

A

Be flat for 2-3 mm above the gingiva

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17
Q

What do Proximal surfaces look like

A

Always flat or slightly concave betwen the contact area and the CEJ to allow room for the Papillae

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18
Q

How many locations can the contact area have

A

Various locations

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19
Q

Function of Contact areas

A

Aids in proper development of the arches
Prevents food from packing between the teeth
Allows the teeth to be self cleaning (to some extent)
Prevents injury to the interproximal tissues

20
Q

What do contacts points become as teeth mature

A

Contact areas

21
Q

Why do contacts between teeth get wider wimeth ti

A

To wear as the teeth move during function

22
Q

Where should the contact areas of all posterior teeth be

A

Buccal to the central fossa and in the occlusal 1/3

  • exception (between max molar: junction of occlusal and middle 1/3 or middle 1/3 not occlusal 1/3)
  • Exception (between max molars in middle 1/3 not buccal)
23
Q

location of distal and mesial contacts in relation to one another

A

Distal contacts are more cervical (except mandibular premolars)

24
Q

Where is the transitional line

A

Betweent he faciolingual convexities and proximal concavities

25
Q

How should the transitional line angle contours look

A

Should blend the convexities and concavities without excessbulk or irregularity

26
Q

What does improper contours of line angles hurt

A

The supporting tissues

27
Q

Where are transitional line angles

A

Are strait between the proximal contact point and the CEJ

28
Q

What happens if the Axial transitional line angles are too proximal

A

Teeth look wide AF

29
Q

What are the two depressions that suround the marginal ridge

A

Occlusal embrasure

Proximal fossa

30
Q

Shape of the marginal Ridges

A

Rounded elevated crests
Convex MD
Concave FL

31
Q

height of MArginal Ridges

A

Adjacent ridges are the same height except between canines and premolars

32
Q

What do you look at if both adjacent marginal ridges are missing, how do you determine height

A

The Opposing cusp

33
Q

What part of the marginal ridge is wider

A

Facial is wider than the lingual half (converge from buccal to lingual)
- except mandibular 3 cusp 2nd premolar and maxillary first molar

34
Q

Function of embrasures

A

Spillway for the escape of food during function

Maintain the tooth clean

35
Q

Size of Buccal vs Lingual embrassure

A

Lingual embrasures are always larger except some maxillary molars

36
Q

what does the cervical curvature relate to

A

The contour of the bony alveolar area

37
Q

Shape of the cervical curvature

A

Occlusally at procimal

Apically at th facial and lingual

38
Q

What is the biologic width

A

about 2 mm

39
Q

why have a biologic width

A

The bone does not like to be close to the margin

40
Q

What causes an over-contoured crown

A

Directly results from inadequate tooth reduction and causes a lack of room for biomaterials

41
Q

What happens if the margins of a restoration are placed subgingival

A

Causes inflamation and reduction of gingival height

42
Q

What kind of margin should you use for subgingival margins and why

A

A metal margin
easily tolerated by tissues
Zirconia if color is important because they are also compatible with tissues

43
Q

How should contours in restorations be established

A

In harmony with the natural tooth structure

44
Q

Problems with a guttered chamfer

A

unsupported enamel

45
Q

How should the perio probe be for a chamfer

A

should fit just the tip

fixed (9 decks)

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