Contacts, Embrasures, COC's, Etc. Flashcards
Line/angle created by junction of facial and proximal surfaces
Facial line angles
When viewed from the facial and lingual aspect, how do incisal/occlusal embrasures change from anterior to posterior?
Incisal/occlusal embrasures get bigger from anterior to posterior when viewed from lingual and facial
Over time, how do teeth move due to interproximal attrition?
Teeth move mesially - arch shortens
Distance of crest of convexity from cervical line on facial and lingual surfaces of mandibular anterior teeth
< .5 mm
Distance of crest of convexity from cervical line of lingual surface of mandibular second premolars
¾ mm
Line around tooth where enamel and cementum meet
Separates anatomical crown and root
Cervical line
Where are mesial/distal contacts of a single tooth in relation to one another?
Distal contacts are more cervical than mesial contacts
EXCEPT mx 1st premolar
Functions of proximal contacts
Stabilizes tooth in alveolus and dental arch
Prevent food impaction
Protects interdental papillae by deflecting away food
Features of epithelial attachment
Seals soft tissue to tooth
Variable in location
Tendency to migrate apically during life moving from enamel to cementum
Normal attachment follows curvature of CEJ
Which tooth is the longest and strongest in both arches
Canine
How does the depth of the curvature of the cervical line change from anterior to posterior?
The depth of the curvature of the cervical line on ALL surfaces decreases from anterior to posterior
Where is the buccal crest of convexity on posterior teeth?
Cervical third
All teeth have distal contacts located more cervically than the mesial contacts EXCEPT
Maxillary 1st premolar
How do facial and lingual line angles compare?
Facial line angles are normally more prominent than lingual line angles
Generally, where are the facial/lingual crests of convexity in relation to the cervical line?
Less than 1 mm beyond cervical line
How does arch change over time?
Becomes shorter because of interproximal attrition
Teeth move mesially
Pyrimidal/triangular shaped space between surfaces of adjacent teeth cervical to contact
Interproximal space
The mesial and distal terminations of the occlusal surfaces of posterior teeth, and lingual surfaces of anterior teeth
Marginal ridges
When viewed from the facial and lingual aspect, how do cervical embrasures (interproximal spaces) change from anterior to posterior?
Cervical embrasures get smaller from anterior to posterior when viewed from facial and lingual
How do proximal contacts change with age?
Get bigger
Start out as contact points
Abrading action of teeth over long period of time