Occlusion Flashcards
Normal Occlusion
Rare
Realistically use centric occlusion as standard
Centric Occlusion
How you close/bite together
Occlusion develops
with primary teeth
Properly aligned teeth
are relatively self cleansing
Teeth out of alignment can affect function of teeth and periodontium
Habitual occlusion
Most comfortable
Normally each tooth (except mand centrals and max 3rds)
occlude with 2 teeth, prevents supraeruption
Occlusal Trauma
Peridonitum withstands a lot of stress from parafunctional habits
Para-functional habits
Nail biting, thumb sucking, malalignment
Trauma can cause issues
doesn’t cause PD but contributes
Overjet
Measures horizontal
How much further frontal teeth are over mand.
1-3 mm normal
Arch Form
Anterior- Curved, canine are arch supports
Middle- Straight line, premolar
Posterior- Straight, Molars function as arch support
Overbite
Measure vertically
Negative or excessive overbite
Do not measure at CSN
Open contacts
Not a good thing, if they don’t have a good contact area teeth will move
Primary Occlusion
Primate space: Jaw grows down and forward to make space for perm. molars
B/w max lateral and canine
and mand 1st molar and canine
Leeway space
Primary molars are greater than perm. premolars
Molar gone and premolar is too small, creates leeway space
Phases of arch development
Jaw development, growth, and lengthening to accommodate perm dentition. Sequence important for space maintenance
Curve of Spee
Front to back, naturally curve
Dip in the middle
Some are deep, some shallow
Curve of Wilson
Mand. teeth aren’t straight
Tilt of lower molars
Side to side curve
Centric Stops
When you bite, places that stop teeth
height of cusp contour, marginal ridges, central fosse
Functioning Cusp
LUBL (Lingual Upper Buccal Lower)
Iatrogenic
Dentist fault, created a problem
Non- Functioning Cusp
BULL (Buccal Upper Lingual Lower)
Centric Relation
Relaxed muscles and pushing the chin back
Should place teeth within 1mm of centric occulusion
Lateral Occlusion
Chew on one side or the other
Working side vs balancing side
Move canine until cusp to cusp, separate posterior teeth
Protrusive Occlusion
Forward movement on mandible
Centrals and lateral meet edge to edge
Freeway space
Mouth relaxed
Space b/w teeth avg 2-3 mm
Malocclusion
Lack of ideal centric occlusion, affects hygiene (tissue infection, food caught)
Angle’s Classification
Class 1, 2,3
Class 1
Ideal relationship of jaws and arches
MB of max 1st molar in line w/ MG of mand 1st molar
Max canine in line w/ distal of mand. canine and mesial of mand 1st molar
What kind of profile is Class 1?
Mesognathic- flat or straight
Class I malocclusion
Crowding or diastimas due to disproportion b/w size of teeth and size of arch
Class 2 malocclusion
MB cusp of max 1st molar in line w/ MG of mand 1st molar by more than the width of a premolar
D surface of canine is D to M surface of max canine by at least width of premolar
Class 2, division 1
Max anteriors protrude facially from mand anteriors
May have overbite
Palate usually curved
What type of profile is class 2 Division 1?
Retrognathic profile- Protruding upper lip, recessive mandible and chin
Class 2 division 2
Molars in class 2 relation but max anterior are upright/retruded
Laterals may tip or overlap centrals
Deep overbite
Don’t extract from this class
What kind of profile is class 2 division 2?
Mesognathic profile- May have prominent chin
Class 3
mand overgrows
Cure w/ surgery
Underbite
What profile is class 3?
Retrognathic
