Terminology

Question 1

Maximal Intercuspal Position

Answer 1

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

Question 2

Centric Occlusion

Answer 2

The occlusion of opposing teeth when the mandible is in the central relation. This may or may not coincide with the maximal intercuspal position.

Question 3

Centric Relation

Answer 3

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.

Question 4

Centric Position

Answer 4

The position of the mandible when the jaws are in centric relation

Question 5

Working Side

Answer 5

The side toward which the mandible moves in a lateral excursion

Question 6

Non-working side

Answer 6

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

Question 7

Retruded Contact Position

Answer 7

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

Question 8

Porion

Answer 8

Midpoint of the upper contour of the external auditory meatus

Question 9

Sella

Answer 9

Midpoint of the cavity of sella turcica

Question 10

Orbitale

Answer 10

The lowest point of the inferior margin of the orbit

Question 11

Pogonion

Answer 11

The most anterior point of the contour of the chin

Question 12

Gonion

Answer 12

The center of the inferior contour of the mandibular angle

Question 13

Nasion

Answer 13

The anterior point of the intersection of the frontal and nasal bone

Question 14

occlusal plane

Answer 14

Line bisecting the overlapping cusps of the first molars and incisors

Question 15

axis orbital plane

Answer 15

plane established by orbital and the terminal hinge axis

Question 16

Transverse Horizontal Axis (Hinge Axis)

Answer 16

An imaginary line around which the mandible may rotate within the sagittal plane

Question 17

Menton

Answer 17

The most inferior part of the mandibular symphysis

Question 18

Y (growth) axis

Answer 18

Angle between line formed by sella and gnathion and the frankfort plane-indicates the position of the chin

Question 19

Occlusal Vertical Dimension (VDO)

Answer 19

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

Question 20

Rest Vertical Dimension (VDR)

Answer 20

The distance between two selected points measured when the mandible is in the physiologic rest position

Question 21

Physiologic rest position

Answer 21

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

Question 22

Interocclusal rest space (IRS)

Answer 22

The difference between the vertical dimension of rest and the vertical dimension while in occlusion (VDR-VDO = IRS)

Question 23

Horizontal Overlap

Answer 23

the projection of teeth beyond their antagonist in the horizontal plane

Question 24

Vertical overlap

Answer 24

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