Static Factors of Occlusion Flashcards
What are three factors and forces that determine the tooth position?
Labiolingual alignment
mesiodistal alignment
Vertical position
Where the tooth erupts between the tongue and the cheek.
Neutral Zone
What two contacts maintain tooth position?
Interpoximal contacts and occlusal contacts
The relation of the teeth to each other within the dental arch
Intra-arch alignment
plane that curves to fit the occlusal surfaces and incisal edges of all the teeth
Plane of occlusion
Is the plane of occlusion concave or convex on the maxilla?
convex
Is the plane of occlusion concave or convex on the mandible?
concave
How are the anterior mandibular teeth angulated?
Labially (20 degrees)
How are the mandibular premolars angulated?
mesially (6 degrees)
How are the mandibular molars angulated?
mesially 10-15 degrees
How are the anterior Maxillary teeth angulated?
labially
How are the Maxillary premolars angulated?
mesially
How are the maxillar molars angulated?
mesially
Antero-posterior curvature of the occlusal plane.
Concave in the mandible and convex in the maxilla
CURVE OF SPREE
medio-lateral curvature of the occlusal plane
concave in the mandible and convex in the maxilla
Curve of wilson
loading of the posterior teeth over the long axis
axial loading
When they occlude they are loaded axially,
designed to take heavy loads, support the occusal vertical dimension
net effect of angulation on the posterior teeth
How does the anterior teeth protect the posterior teeth?
protects from mandibular excursions
How do the posterior teeth protect the anterior teeth?
protects by taking the force of closure of the mandible
the area defined by the cusp tips and the mesial and distal cusp ridges/ arms
occlusal table
this accounts for 50-60% of the buccolingual width of the tooth
The relationship of the teeth in one arch to those in the other
inter-arch tooth alignment
Which arch is wider max or man?
maxillary
Which arch is longer?
maxillary
Which cusp is functional on the maxillary posterior teeth?
lingual = functional
Which cusp is functional on the mandibular posterior teeth?
buccal = functional
What occurs when the functional cusps switch on the maxillary and mandibular arches?
posterior crossbite
Where do functional cusps contact the other tooth?
the functional outer aspect
imaginary line drawn through the buccal cusp tips of the mandibular teeth
buccal-occlusal line
imaginary line drawn through the lingual cusp tips of the maxillary teeth
linguo-occlusal line
imaginary line that follows the central grooves of and fossa of all the posterior teeth.
central fossa line
bucco-occlusla line of the ______ occludes in the Central fossa line of the ______
mandible
Maxilla
Linguo-occlusal line of the ______ occludes with the central fossa line of the _______.
maxilla
mandible
The BO line of the maxilla occludes with the CF line of the mandible.
the LO line of the mandible occludes with the CF line of the maxilla
Crossbite
Is the ideal occlusion from an orthodontic perspective
angles class 1
The MB cusp of the maxillary first molar is aligned directly over the buccal groove of the mandibular first molar
angles class 1 relationship
The MB cusp of the maxillary first molar is situated over the embrasure between the mandibular second premolar and first molar
angles class II
The MB cusp of the maxillary first molar is situated over the embrasure between the mandibular first and second molar
Angles class III
What are the two divisions of angles class II anterior occlusion
Division 1: the mandibular teeth contact the gingival third of the maxillary anterior teeth
Division 2: maxillary incisors are lingually inclined, laterals overlap the centrals labially
Which of the following teeth have the greatest axial inclination relative to the occlusal plane?
Maxillary central incisors
