Terminology Flashcards
Maximal Intercuspal Position
The complete intercuspation of the opposing teeth independent of condylar position, sometimes referred to as the best fit of the teeth regardless of the condylar position-also called maximal intercuspation
Centric Occlusion
The occlusion of opposing teeth when the mandible is in the central relation. This may or may not coincide with the maximal intercuspal position.
Centric Relation
The maxillomandibular relationship in which the condyles articulate with the thinnest avascular portion of their respective disks with the complex in the anterior-superior position against the shapes of the articular eminencies. This position is independent of tooth contact. This position is clinically discernible when the mandible is directed superior and anterioly. It is restricted to a purely rotary movement about the transverse horizontal axis.
Centric Position
The position of the mandible when the jaws are in centric relation
Working Side
The side toward which the mandible moves in a lateral excursion
Non-working side
The side of the mandible that moves toward the median line in a lateral excursion. The condyle on that side is referred to as the nonworking side condyle
Retruded Contact Position
Guided occlusal relationship occuring at the most retruded position of the condyles in the joint cavities. A position that may be more retruded than the centric relation position
Porion
Midpoint of the upper contour of the external auditory meatus
Sella
Midpoint of the cavity of sella turcica
Orbitale
The lowest point of the inferior margin of the orbit
Pogonion
The most anterior point of the contour of the chin
Gonion
The center of the inferior contour of the mandibular angle
Nasion
The anterior point of the intersection of the frontal and nasal bone
occlusal plane
Line bisecting the overlapping cusps of the first molars and incisors
axis orbital plane
plane established by orbital and the terminal hinge axis
Transverse Horizontal Axis (Hinge Axis)
An imaginary line around which the mandible may rotate within the sagittal plane
Menton
The most inferior part of the mandibular symphysis
Y (growth) axis
Angle between line formed by sella and gnathion and the frankfort plane-indicates the position of the chin
Occlusal Vertical Dimension (VDO)
The distance measured between two points (one of which is on the middle of the face or nose and the other of which is on the lower face or chin) when the occluding members are in contact in maximal intercuspal position
Rest Vertical Dimension (VDR)
The distance between two selected points measured when the mandible is in the physiologic rest position
Physiologic rest position
The mandibular position assumed when the head is in an upright position and the involved muscle, particularly the elevator and depressor groups are in equilibrium in tonic contraction, and the condyles are in neutral, unstrained position
Interocclusal rest space (IRS)
The difference between the vertical dimension of rest and the vertical dimension while in occlusion (VDR-VDO = IRS)
Horizontal Overlap
the projection of teeth beyond their antagonist in the horizontal plane
Vertical overlap
the vertical relationship of the incisal edges of the maxillary incisors to the mandibular incisors when the teeth are in the maximum intercuspation. 2mm VO
