Occlusion Bootcamp Flashcards
Static relationship between the incising or masticating surfaces of the maxillary & mandibular teeth:
Occlusion
_____ is the way teeth are shaped; ____ is the way teeth fit together
Morphology; occlusion
The tightest or best fit between maxillary & mandibular teeth
MI
Is CR affected by malocclusion?
No
A relationship between the teeth that is irrespective of tooth position or vertical dimension:
CR
What position is used when mounting diagnostic casts of our patients teeth?
CR
What determines centric relation?
Ligaments NOT teeth
Fibrocartilage present between the mandible & elements of articular eminence:
Articular disc
Retrodiscal tissue is _____ to the mandible
Posterior
If CR and MIP do not exist together, this is because there has to be a:
Prematurity or deflective occlusal contact
The average plane established y the incisal & occlusal surfaces of the teeth
Occlusal plane
The anteroposterior (or mesiodistal) curvature of cusps tips of the teeth:
Curve of Spee
Mandibular Curve of Spee:
Maxillary Curve of Spee:
Mandibular: Concave
Maxillary: Convex
anteroposterior:
Front to back- anterior teeth to posterior teeth
The mediolateral curvature of the cusp tips of the teeth:
Curve of Wilson
The Curve of Wilson is the _____ curvature of the cusp tips of the teeth
Mediolateral
The curve of Wilson spans from the:
Right to the left side of the arch
Side-to-side:
Front-to-back:
Curve of Wilson
Curve of Spee
Curve of Wilson in mandible can be described as:
Curve of Wilson in the maxilla can be described as:
Concave
Convex
Functional/working cusps are cusps that are _____
Centric
Hold the vertical dimension of occlusion:
Functional/working cusps
Functional/working cusps function in:
Mastication
Functional/working cusps come down in the _____ when they occlude
Opposing tooth’s central fossa
Functional/working cusps of maxillary teeth:
Lingual cusps
Cusps that do not occlude in the central fossae of occluding teeth:
Non-functional cusps
Non-functional cusps of maxillary teeth:
Buccal cusps
Functional/working cusps of the mandibular teeth:
Buccal cusps
Non-functional cusps of the mandibular teeth:
Lingual cusps
Working/functional cusps occlude in the ____ of opposing teeth
Central fossae
Orthodontic classifications based on the locations of the maxillary & mandibular first molars
Angle’s Classification
What is the ideal Angle’s classificaiton?
Class I
Angle’s Class II & III are considered:
Malocclusion
The MB cusp tip of the maxillary first molar is aligned with the MB groove of the mandibular first molar:
Angle’s Class I
The maxillary canine fits in the facial embrasure between the mandibular canine and the premolar:
Angle’s Class I
The resulting profile of Angle’s Class I:
Orthognathic
No protrusion or retrusion of the mandibule relative to the maxilla:
Orthognathic
The MB cusp of the maxillary first molar is mesial to the MB groove to the mandibular first molar:
Angle’s Class II
The resulting facial profile from an Angle’s Class II:
Retrognathic
The mandible is retruded relative to the maxilla:
Angle’s Class II
Overbite:
Angle’s Class II
The MB cusp of the maxillary first molar is distal to the MB groove of the mandibular first molar:
Angle’s Class III
The facial profile resulting from Angle’s Class III:
Prognathic
The mandible protruded relative to the maxilla:
Prognathic
Underbite:
Angle’s Class III
Typically, anterior teeth are ______ inclined
Labially
When you set teeth in a dentures course, you will set maxillary anterior teeth with a _____
10 degree labial inclination
Incisal edges of mandibular incisors should contact the _____ surfaces of maxillary incisors
Lingual
The contact of the incisal edges of mandibular incisors contacting the lingual surface of maxillary incisors should contact approximately ____ gingival to the incisal edge
4 mm
For anterior teeth a class II division I results in:
Deep bite (incisal edge of mandibular incisor is contacting lingual cervical portion of the maxillary central incisor
For anterior teeth a class II division II results in:
The typically class I contact being pushed upward cervically
The most common result of a class III malocclusion is:
End to end contact of incisors
Class III malocclusion can cause end to end incisal contact, but also:
Underbites & anterior open bite
A tooth that is overly erupted and abnormally long as a result:
Supreruption
Often the result of no functional contact between the tooth in question and a tooth in the opposing arch:
Supraeruption
An abnormal twisting of the tooth:
Torsiversion
A tooth that is out of alignment to the labial compared to the ideal arch
Labioversion
Due to mesial drift of posterior teeth, anterior teeth can crowd. The result is overlapping teeth and abnormal tooth-to-tooth contacts:
Crowding
Often seen in lower anterior teeth:
Crowding
When a short primary tooth is retained into adulthood, its cementum can fuse to surrounding bone stopping its eruption:
Ankylosis
Extractions of ____ teeth can be difficult
Ankylosed
The distance between a selected point on the mandible & a selected point on the maxilla:
Occlusal vertical dimension (OVD)
When measure OVD we place the teeth in:
CR or MIP
The position of the mandible when all the muscles that support it are completely at rest
Physiological rest position (PRP)
When in physiological rest position, there is typically a space between the maxillary and mandibular incisors, this space is called:
Interocclusal rest space
Interocclusal rest space is typically:
2-4 mm
What are the major movements of the mandible that occur in the opening process?
Rotation & Translation
Rotation is a purely rotational movement where the body of the mandible:
Rotates around a fixed horizontal axis line
Purely rotational movements, where the body of the mandible rotates around a fixed horizontal axis line, can be described as:
Hinge-like movement
Where does rotation occur:
In the lower joint space of the TMJ
What occurs after rotation when the mouth has opened about half-way?
Translation
During translation, the mandibular condyles & discs:
Translate forward onto the articular eminences
Full movement of the mandible that moves the entire mandible down and forward, which occurs in the upper joint space of the TMJ:
Translation
Type of movement that occurs in the LOWER JOINT SPACE:
Rotation
Type of movement that occurs in the UPPER JOINT SPACE:
Translation
Any movement of the mandible from MIP that results in tooth contact:
Eccentric movement
Any movement of the mandible away from CR include:
Protrusive movements
Laterotrusive movements
Retrusive movements
Protrusive, laterotrusive & retrusive movements can all be considered:
Eccentric movements
Movement that occurs when the mandible moves anteriorly:
Protrusive movement
During a protrusive movement, both anterior condyles and their articular discs:
Move forward in their fossa
During a protrusive movement, the slopes of the articular eminences guide:
The mandible down & forward
The result of a protrusive movement in a class I occlusion:
Incisors sitting end-to-end in relation to one another
