Anatomy Ch 12 Flashcards
Functional occlusion
Contact of the teeth during biting and chewing movements
What is the key to angles classification
Describes and classifies occlusion and malocclusion (perm maxillary first molar)
Which two teeth vary in form
Lateral incisors 7,10 and 3rd molars
Pegged laterals
Vary in form second most to wisdom teeth. Frequently missing and pointed (maxillary lateral incisors)
Mamelons
Rounded enamel extensions on Incisal edge on central and lateral incisors (looks like shark teeth)
Fossa
Wide shallow depression on the lingual surfaces of anterior teeth
Cingulum
Raised rounded area on the cervical third of the lingual surface
Class 1 occlusion
Neutroclusion ideal mesiodistal relationship maxillary first molar occludes with mesiobuccal groove of mandibular first molar
Class 2 occlusion
Distoclusion mesiobuccal cusp of maxillary first molar occludes more than a premolars width mesial to the mesiobuccal groove of mandibular first molar
Class 2 division 1 occlusion
Labioversion incisors tilt toward lips
Class 2 division 2 occlusion
Linguoversion tipping toward tongue. Lateral incisors may be tipped labially and mesially
Class 3 occlusion
Mesioclusion protrusion of mandible
Tooth numbering system used most in US
Universal/national system. 1-32, a-t
International standards organization system
2 digit first number is quadrant and second is tooth within quadrant. Tooth 8=11, tooth 1=18, tooth 9=21, tooth 16=28 etc
Palmer notation system
Each quadrant given tooth bracket either vertical or horizontal viewing patient from outside. Each incisor on mandible and maxillary begin with 1 and end with 8
Pit
Located in deepest part of fossa sharp pin point depression where 2 or more grooves meet
Central and triangular fossa
Where 2 or 3 cusp ridges meet
Groove
sharp deep v-shaped linear depressions
5th cusp
Cusp of carabelli located on the maxillary first molar
What teeth are nonsuccedaneous
All molars
Which tooth is the largest
Maxillary first molar
Features of maxillary first premolar
2 cusps 2 roots larger than 2nd erupt before mandibular bifurcated root
Furcation
Area between two or more root branches
Tricanineate
3 cusp type
Difference between primary and perm dentition
Primary smaller whiter enamel crown in shorter crowns narrower at CEJ roots narrower and longer than crown pulp chamber/horns large compared to perm thick layer of dentin between pulp chamber and enamel enamel layer thin
Diff in primary incisors from perm
Crowns and roots smaller roots twice as long as crowns taper toward apex
Maxillary first premolar has what kind of root
Bifurcated
Inclined cuspal planes
The sloping areas between ridges
Central groove
Divides occlusal table in half
Marginal groove
Spillway on side of tooth crosses marginal ridge
Triangular grooves
Separate marginal ridge from triangular ridge of a cusp
Maxillary second premolar
2 cusps one root equal length cusps not as sharp as first one root slight depression on mesial root
Mandibular first premolar
Long well formed buccal cusp nonfunctioning lingual cusp
Mandibular second premolar
2 & 3 cusp type Y and U shape
What teeth are first perm to erupt
Maxillary molars
3rd molar
Crown smaller roots shorter and fused
Mandibular first molar
Erupt between 6-7 yrs first perm teeth 2 roots
Mandibular second molar
2 roots 4 cusps
