Oral Biology: Occlusion Flashcards
What is occlusion?
Contact relationships between teeth:
- within arches
- between arches
What factors does occlusion consider? (7)
1) contact points
2) arch form
3) tooth alignment
4) cross bites
5) intercuspal position
6) molar relationships
7) incisor relationships
A contact point is a stagnation area. What does this pose an increased risk for?
Caries
What is a contact point critical for? (2)
1) food displacement during mastication
2) arch alignment/stability
It is therefore important to restore a contact point.
What is an approximal surface?
The approximal surfaces are those surfaces whcih form points of contact between adjacent teeth
Which arch is normally longer than it’s opposing arch?
Upper arch overlaps lower arch
Where do the buccal cusps of the upper dentition meet on the lower dentition when teeth are occluded?
Upper buccal cusps are buccal to lower buccal cusps
What does each upper tooth contact with? (2)
Each upper tooth contacts with its lower antagonist and it’s distal neighbour
What is tooth alignment determined by?
2
1) path of eruption
2) forces exerted on the teeth by: teeth, soft tissues, and other factors like thumb sucking
Describe the “neutral zone” in tooth alignment
the “neutral zone” is the sense of equilibrium between forces exerted on a tooth
Which dental treatment makes the neutral zone clinically important?
Denture construction
Which anatomical features of which teeth are described by Angle’s Classification?
Relationship between the MB cusp of the upper 6’s and the MB groove of the lower 6’s
What is the definition of an overbite in relation to incisor relationships?
An overbite is an upper tooth overlap in the vertical plane
What is the definition of an open bite?
No overbite, upper and lower teeth do not contact
What is the definition of an overjet?
upper tooth overlap in the horizontal plane