Developing Posterior Contours

Question 1

The proper degree of curvature of the crown will deflect food over the ____, preventing irritation

Answer 1

Gingival margin

Question 2

If curvature is absent, the gingival tissue will be driven ____, resulting in pathological changes.

Answer 2

Apically

Question 3

The proper curvature allows ____ of soft tissue

Answer 3

Stimulation

Question 4

If the curvature is too great, the gingiva is protected too much and loses ____. Food and debris may pack under this area and result in chronic inflammation of the gingiva.

Answer 4

Gingival tone

Question 5

Posterior facial contours should be no more than ____ mm facially beyond the CEJ (in the ___ third)

Answer 5

.5

Cervical

Question 6

Posterior lingual contours should be no more than ___ mm lingually beyond the CEJ (In the ___ third)

Exceptions?

Answer 6

.5

Middle

Mandibular second premolar and molars: 0.75-1 mm lingual

Question 7

Tooth surface that is gingival to height of contour and above gingival crest (should be flat for 2-3 mm above gingiva)

Answer 7

Emergence Profile

Question 8

Proximal surfaces are always flat or slightly concave between the contact area and the CEJ to allow room for the ___

Answer 8

papillae

Question 9

Functions of contact areas:

Answer 9

1. Aids in proper arch development
2. Prevents food from packing between teeth
3. Allows teeth to be self-cleaning
4. Prevents injury to interproximal tissues

Question 10

Interproximal contacts get ____ with time due to wear as teeth move during function

Answer 10

Broader

Question 11

Contact areas of all posterior teeth should be ____ to the central fossa and in the ___ third

Answer 11

Buccal

Occlusal

Question 12

Exception to occlusal 1/3 contact (in posteriors)?

Answer 12

Between max molars- junction of occlusal and middle 1/3 or middle 1/3s

Question 13

Exception to buccal to buccolingual center contact of posteriors?

Answer 13

Between max molars- in middle 1/3

Question 14

Distal contacts are more ____ than mesial contacts.

Exception?

Answer 14

Cervical

Mand 1st premolars

Question 15

Between faciolingual convexitis and proximal concavities there is a surface called the ____. The contours of this area should blend the convexities and concavities without excess bulk/irregularity.

Answer 15

Transitional Line angle

Question 16

Transitional line angles are ____ between the proximal contact point and the cementoenamel junction.

Answer 16

Straight

Question 17

Adjacent marginal ridges are at same height EXCEPT between ____ and ____.

Answer 17

Canines

Premolars

Question 18

What do you do if both adjacent marginal ridges are missing, how can I determine the height?

Answer 18

Use opposing cusp

Question 19

Facial 1/2 of marginal ridge is ____ than lingual 1/2

Answer 19

Wider

Question 20

Marginal ridges ____ from buccal to lingual.

Exceptions?

Answer 20

Converge

Mandibular 2nd premolar 3 cusp type and maxillary first molar

Question 21

Embrasures (“V”-shaped spaces extending outward from contact areas) are also known as _____

Answer 21

Spillway Spaces

Question 22

Functions of embrasures:

Answer 22

1. Spillway for the escape of food during function

2. Helps keep teeth clean

Question 23

Lingual embrasures are always ____ than buccal embrasures.

Except?

Answer 23

Larger

Between 1st and 2nd max molars

Question 24

Biological width is ____ mm between margin and bone.

Answer 24

1.5 - 2 mm