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types of teeth
- incisors - slicing, cutting
- canines (cuspids) - tearing, ripping
- premolars (bicuspids) - grinding
- molars - grinding
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baby teeth are called
deciduous or milk teeth
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deciduous teeth number
- 20 (10 on each arch)
- 4 incisors (2 central and 2 lateral)
- 2 canines (cuspids)
- 4 molars
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deciduous teeth ages
- first in by 9 months (incisors)
- last out by 12 years (molars)
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bottom arch
mandibular arch
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adult teeth aka
permanent teeth
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permanent teeth number
- 32 (16 on each arch)
- 4 incisors (2 central 2 lateral)
- 2 canines (cuspids)
- 4 premolars (bicuspids)
- 6 molars
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permanent teeth ages
- first in by 8 years (incisors)
- last in by 18-25 years (wisdom)
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draw diagram of teeth
slide 5
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surfaces of teeth
- medial - toward the midline of the arch
- distal - toward the endpoint of the arch
- buccal - toward the cheek
- labial - toward the lips
- lingual - toward the tongue
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Class I Occlusion
- normal occlusion / neutroclusion / overjet
- upper incisors project just a few mm ahead of lower incisors
- first mandibular molar is one half tooth advanced of maxillary molar
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Class II Occlusion
- distocclusion / overbite
- lower first molar is even with or behind the 1st upper molar
- mandible is retracted from (distal to) the maxilla
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Class III Occlusion
- mesiocclusion / underbite
- lower first molar is a whole tooth or more ahead of the 1st upper molar
- mandible is protruding from (mesial to) the maxilla
- can lead to lisps and tongue being further ahead in the jaw
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overjet bite
1 to 3 mm horizontal clearane at the incisors
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overbite bite
1/3 to 1/2 tooth vertical overlap at the incisors
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openbite bite
vertical space between the arches
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closed bite
excessive vertical overlap
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crossbite
maxillary tooth falls lingual to the mandibular tooth
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most important teeth for articulation
- incisors
- split the airstream on many fricatives
- add stridency (high frequency)
- needed for fricatives (s,z), labiodental fricatives (f,v), and linguadental fricatives (th, th)
- entire upper arch may be contacted for different sounds
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