Occlusion - Static Flashcards
When thinking of occlusion what is there to consider
Contact points Arch form Tooth alignment Cross bites ICP Molar relationship Incisor relatinships
Tooth contact
Contact point is a stagnation - caries risk
Contact point critical for food displacemtn during mastication and also imp for arch alignment
What si the contact point like in posterior teeth compared to anterior teeth
Posterior teeth mor evil ours so greater contact point
What do the marginal ridges do
Direct food away from contact points
What are the arch relationships
Upper arch slightly longer than lower
Upper buccal cusps must be buccal to lower buccal cusps (overlap)
Each upper tooth contacts with
It’s lower antagonist and its distal neighbour
Why are the cusps aligned like so
Cusp into ridge to increase maximal interdigitations
What is tooth alignment determined by
Path of eruption
Forces exerted on the teeth by teeth, soft tissues, other factors such as thumbs
What si the neutral zone
Zone of equilibrium between forces exerted on a tooth
Between lips and tongue
V imp for dentures
What are the alignment kf the teeth
Incisors tilted partially inwards
Posterior teeth angle out to buccal
What si the curve of Wilson
Way the occlusal curves in the posterior of mouth compensating curve for TMJ movements
What is a bilateral cross bite
Lower buccal cusps sit buccal to upper buccal cusps
Easier to fix as symmetrical
What is a unilateral cross bite
One side normal
Other side the buccal cusp lower is buccal to the upper buccal cusp
Harder to fix
What su ICP
Maximal Interdigitate together best that they can
What si the curve of spee
Anteroposteror curve teeth not vert orientated
What si angles classification
The relationship between upper and lower 6’s
MB cusp of the upper 6 relation to the MB groove of lower 6
What are the classifications of angles
Class 1 - norm, MB cups of upper 6 is in MB groove
Class 2 - MB cusp Infront of MB groove
Class 3 - MB cusp behind the MB groove
What is an overbite
Measure vertical overlapping is overbite
What si the incisor classifications
Kate’s lower incisor tip to Cingulum plateau of upper incisor
Class 1 - tip On plateau
Class 2 - div 1 - overjet behind plateau div 2 - overbite behind plateau
Class 3 - reverse overjet lower incisor infrint if upper
What si an overjet
Tooth overlap in horizontal plane
What si a revere overjet
When lower incisor infrint of upper
What is occlusion
Contact relationships between teeth within arches and between arches
