Term
| What are the 3 main shapes of teeth? |
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Definition
1. triangular
2. trapezoidal
3. rhomboidal |
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Term
| Shape of facial and lingual aspects of permanent teeth |
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Definition
| trapezoidal (short parallel end is cervical) |
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Term
| shape of anterior teeth from proximal surface |
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Definition
-triangular (base at cervical end)
-sharp tip for tearing, biting food |
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Term
| shape of maxillary posterior teeth from proximal |
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Definition
-trapezoidal (long parallel side cervical)
-wedge shape aids in force distribution and cleaning |
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Term
| shape of mandibular posterior teeth from proximal |
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Definition
-rhomboidal (crown towards lingual)
-helps with interlocking with maxillary post. teeth during mastication |
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Term
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Definition
-the place where teeth touth (interproximally)
-prevent food from going between teeth
-stabilizes dental arch
-size increases with age
-ant. --> post. contact becomes more cervical and size increases
-ant. contact areas are centered faciolingually
-post. contact areas located buccal of center |
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Term
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Definition
-triangular spce containing the papilla
-shape is important for stimulation of periodontium and self cleaning |
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Term
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Definition
-open space between proximal surfaces of adjacent teeth
-function to help in self-cleaning and spillway for food
-4 embrasures:
1. incisal/occlusal
2. cervical/gingival
3. labial/buccal
4. lingual |
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Term
| possible improper embrasure effects |
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Definition
-2 main problems with embrasures
1. lack of protection --> overstimulation of periodontium --> breakdown
2. overprotection --> lack of stimulation of periodontium -->breakdown |
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Term
embrasure trends (in size)
1. incisal
2. cervical
3. labial and lingual
4. buccal and lingual
5. contours |
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Definition
1. ant --> post incisal increase in size
2. ant --> post cervical decrease in size
3. (ant teeth) labial and lingual nearly equal in size
4. (post teeth) lingual > buccal
5. both sides of embrasure will have similar contours |
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Term
| height of contour aka crest of curvature |
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Definition
-greatest area of contour inciso/occluso cerviaclly on the facial and lingual surfaces
-in English: the part of the sides of the tooth that buldge out |
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Term
| problems with the height of contour |
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Definition
1. over-contoured --> food deflected away from gingiva
--> lack of stimulation --> breakdown
2. under-contoured --> inadequate protection of gingiva from food --> overstimulation --> breakdown |
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Term
| Where is the height of contour on facial and lingual surfaces? |
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Definition
1. facial (all) - cervical third
2. lingual (ant) - cervical third
3. lingual (post) - middle or occlusal third |
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Term
| gingival line/gingival margin/gingival crest |
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Definition
-end of the non-attached gingiva (top of sulcus)
-recedes with age |
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Term
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Definition
-where the gingiva attached to to the tooth (above periodontal ligament)
-recedes apically with age |
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Term
| cervical line (CEJ) contours |
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Definition
-facial and lingual - curved apically
-mesial and distal - curved incisally/occlusally
-curve size
1. mesial > distal
2. ant > post |
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Term
| marginal ridges along entire arch |
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Definition
-height of adjacent marginal ridges are the same
-adjacent ridgese creaste occlusal embrasure (post)
or lingual embrasure (ant) |
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Term
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Definition
| create trough along occlusal of post teeth to allow for food flow during mastication |
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Term
| roots on anterior teeth and most premolars |
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Definition
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Term
| roots on maxillary first premolar |
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Definition
| two root branches, buccal and lingual |
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Term
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Definition
| 3 roots: one lingual and two buccal |
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Term
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Definition
| two roots: one mesial and one distal |
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