EXAM 1 Flashcards
Occlusion
The relationship of the maxillary and mandibular teeth when they are in functional contact during activity of the mandible
Centric relation
The most orthopedically stable joint position. The maxilla mandibular relationship in which the condyles articulate, with the articular discs properly interposed, in the most antero-superior position against the posterior slope of the articulation eminences.
Centric occlusion
The occlusion of opposing teeth when the mandible is in centric relation. It may or may not coincide with the maximal intercuspal position.
Maximum intercuspation
Maximum occlusal inter-arch contact irrespective of condylar position. It may or may not occur in the path of centric relation.
Parametric
Angles
Axes
Curves
Planes
Angles
Bennet angle
Bennet angle
Angle formed between the sagittal plane and the average path of the advancing condyle as viewed in the horizontal plane during lateral mandibular movements.
Axes
Sagittal axis
Vertical axis
Transverse horizontal axis
Sagittal axis
An imaginary anteroposterior line around which the mandible may rotate when viewed in the frontal plane
vertical axis of the mandible
An imaginary line around which the mandible may rotate through the horizontal plane.
Transverse horizontal axis
An imaginary line around which the mandible may rotate within the sagittal plane
Curves
Spee curve
Wilson curve
Spee curve
Anteroposterior curve. The anatomical curve establish by the occlusal alignment of the teeth, beginning with the cusp tip of the mandibular canine and following the buccal cusp of the premolar and molar teeth, continuing through the anterior border of the mandibular ramus, ending with the anterior-most portion of the mandibular condyle.
Wilson curve
Mediolateral curve. The curvature of the cusps as projected on the frontal plane expressed in both arches. The curve in the lower arch being concave and the curve in the upper arch being convex.
Planes
Frontal plane (coronal)
Horizontal plane
Sagittal plane
Frontal plane (coronal)
Any plane parallel to the long axis of the body and at right angles to the median plane, thus dividing the body into front and back parts
Horizontal plane
Any plane passing through the body at right angles to both the median and frontal planes, thus dividing the body into upper and lower parts
Sagittal plane
Any vertical plane or section parallel to the median plane of the body that divides a body into right and left portions
Articulation
The static and dynamic contact relationship between the occlusal surfaces of the teeth during function
canine protected articulation -canine guidance
Form of mutually protected articulation in which the vertical and horizontal overlap of the canine teeth disengage the posterior teeth in the excursive movements of the mandible
Mutually protected articulation
When the posterior teeth prevent excessive contact of the anterior teeth in maximum intercuspation, and the anterior teeth disengage the posterior teeth in all mandibular excursive movements.
Group function
Multiple contact relations between the maxillary and mandibular teeth in lateral movements on the working side
Class I
Normal occlusion or neutrocclussion
The dental relationship in which there is normal anteroposterior relationship of the jaws, as indicated by correct interdigitation of maxillary and mandibular first molars
Class II
Distoccusion
The dental relationship in which the mandibular dental arch is posterior to the maxillary dental arch in one or both lateral segments. The mandibular molar is distal to the maxillary first molar
2 divisions
Division 1
Narrow maxillary arch and protruding maxillary incisors
Division 2
Normal maxillary arch with maxillary central incisors and excessive vertical overlap
Class III
Messioocclusion
The dental relationship in which the mandibular arch is anterior to the maxillary arch in one or both lateral segments. the mandibular first molar is mesial to the maxillary first molar. The mandibular incisors are usually in anterior cross bite.
