Developing Posterior Contours Flashcards
The proper degree of curvature of the crown will deflect food over the ____, preventing irritation
Gingival margin
If curvature is absent, the gingival tissue will be driven ____, resulting in pathological changes.
Apically
The proper curvature allows ____ of soft tissue
Stimulation
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.
Gingival tone
Posterior facial contours should be no more than ____ mm facially beyond the CEJ (in the ___ third)
.5
Cervical
Posterior lingual contours should be no more than ___ mm lingually beyond the CEJ (In the ___ third)
Exceptions?
.5
Middle
Mandibular second premolar and molars: 0.75-1 mm lingual
Tooth surface that is gingival to height of contour and above gingival crest (should be flat for 2-3 mm above gingiva)
Emergence Profile
Proximal surfaces are always flat or slightly concave between the contact area and the CEJ to allow room for the ___
papillae
Functions of contact areas:
- Aids in proper arch development
- Prevents food from packing between teeth
- Allows teeth to be self-cleaning
- Prevents injury to interproximal tissues
Interproximal contacts get ____ with time due to wear as teeth move during function
Broader
Contact areas of all posterior teeth should be ____ to the central fossa and in the ___ third
Buccal
Occlusal
Exception to occlusal 1/3 contact (in posteriors)?
Between max molars- junction of occlusal and middle 1/3 or middle 1/3s
Exception to buccal to buccolingual center contact of posteriors?
Between max molars- in middle 1/3
Distal contacts are more ____ than mesial contacts.
Exception?
Cervical
Mand 1st premolars
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.
Transitional Line angle
Transitional line angles are ____ between the proximal contact point and the cementoenamel junction.
Straight
Adjacent marginal ridges are at same height EXCEPT between ____ and ____.
Canines
Premolars
What do you do if both adjacent marginal ridges are missing, how can I determine the height?
Use opposing cusp
Facial 1/2 of marginal ridge is ____ than lingual 1/2
Wider
Marginal ridges ____ from buccal to lingual.
Exceptions?
Converge
Mandibular 2nd premolar 3 cusp type and maxillary first molar
Embrasures (āVā-shaped spaces extending outward from contact areas) are also known as _____
Spillway Spaces
Functions of embrasures:
- Spillway for the escape of food during function
2. Helps keep teeth clean
Lingual embrasures are always ____ than buccal embrasures.
Except?
Larger
Between 1st and 2nd max molars
Biological width is ____ mm between margin and bone.
1.5 - 2 mm
