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Shapes and Spaces
DA Section 2
22
Anatomy
Graduate
09/08/2014

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Cards

Term
What are the 3 main shapes of teeth?
Definition

1. triangular

2. trapezoidal

3. rhomboidal

Term
Shape of facial and lingual aspects of permanent teeth
Definition
trapezoidal (short parallel end is cervical)
Term
shape of anterior teeth from proximal surface
Definition

-triangular (base at cervical end)

-sharp tip for tearing, biting food

Term
shape of maxillary posterior teeth from proximal
Definition

-trapezoidal (long parallel side cervical)

-wedge shape aids in force distribution and cleaning

Term
shape of mandibular posterior teeth from proximal
Definition

-rhomboidal (crown towards lingual)

-helps with interlocking with maxillary post. teeth during mastication

Term
contact areas
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

Term
interproximal spaces
Definition

-triangular spce containing the papilla

-shape is important for stimulation of periodontium and self cleaning

Term
embrasures
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

Term
possible improper embrasure effects
Definition

-2 main problems with embrasures

1. lack of protection --> overstimulation of periodontium --> breakdown

2. overprotection --> lack of stimulation of periodontium -->breakdown

Term

embrasure trends (in size)

1. incisal

2. cervical

3. labial and lingual

4. buccal and lingual

5. contours

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

Term
height of contour aka crest of curvature
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

Term
problems with the height of contour
Definition

1. over-contoured --> food deflected away from gingiva

--> lack of stimulation --> breakdown

2. under-contoured --> inadequate protection of gingiva from food --> overstimulation --> breakdown

Term
Where is the height of contour on facial and lingual surfaces?
Definition

1. facial (all) - cervical third

2. lingual (ant) - cervical third

3. lingual (post) - middle or occlusal third

Term
gingival line/gingival margin/gingival crest
Definition

-end of the non-attached gingiva (top of sulcus)

-recedes with age

Term
epithelial attachment
Definition

-where the gingiva attached to to the tooth (above periodontal ligament)

-recedes apically with age

Term
cervical line (CEJ) contours
Definition

-facial and lingual - curved apically

-mesial and distal - curved incisally/occlusally

-curve size                                             

1. mesial > distal                

2. ant > post                      

Term
marginal ridges along entire arch
Definition

-height of adjacent marginal ridges are the same

-adjacent ridgese creaste occlusal embrasure (post)

or lingual embrasure (ant)

Term
post central grooves
Definition
create trough along occlusal of post teeth to allow for food flow during mastication
Term
roots on anterior teeth and most premolars
Definition
single roots
Term
roots on maxillary first premolar
Definition
two root branches, buccal and lingual
Term
maxillary molar roots
Definition
3 roots: one lingual and two buccal
Term
mandibular molar roots
Definition
two roots: one mesial and one distal
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