2016 Glossary - 22

effects of microorganisms. Normally it does not destroy bacterial spores.
disjunctor n: a component of artificial prosthesis that
allows movement between 2 or more parts.
disk n: regarding the temporomandibular joint, the
avascular intra-articular tissue that separates the
temporomandibular joint into 2 compartments. The
avascular intra-articular tissue separating 2 bone
surfaces allowing for movement of the joint; also
spelled disc.
disk degeneration n: progressive degenerative changes in the temporomandibular joint articular disk; the
breakdown of the joint articular disk through degenerative disease.
disk derangement n: a misalignment of the articular
disk between the condyle, fossa, and/or the bony
eminence that often results in pain, swelling, and/or
difficulty with mastication.
disk detachment n: a separation of the disk from its
capsule, ligament, or bony surface.
disk displacement with reduction n: disk dislodgment where the temporomandibular joint disk has
shifted in an anterior-medial direction when at rest
but returns to its proper position with mandibular
movement. It frequently has an associated clicking
sound.
disk displacement without reduction n: disk dislodgment where the temporomandibular joint disk
has shifted in an anterior-medial direction when at
rest but does not return to its proper position with
mandibular movement.
disk interference n: restriction of mandibular movement because of pathology or dysfunction of the
disk; a dysfunction of the normal articular disc movement that often results in pain and normal mandibular movement.
disk locking n: a dysfunction of the disk's normal position and/or function in the temporomandibular
joint in which it cannot return to normal position or
function.
disk perforation n: a bounded hole or tear in the
center of the temporomandibular joint's articular
disk that is the result of deterioration associated with
22

habitual increased compressive forces. The opening
allows for communication between the superior and
inferior joint spaces. The attachment associated with
the capsule, ligaments, or bone is not altered.
disk prolapse n: rotation of the temporomandibular
disk downward and forward on the face of the condyle eminence.
disk space n: the space that is typically occupied by the
intra-articular disk between the mandibular condyle
and the articular fossa that is represented on a temporomandibular joint radiograph as a radiolucency.
disk thinning n: reduced thickness of the intra-articular disk as a result of an autoimmune degenerative
process, chronic pressure during function, or the
combination of both.
dislocated fracture n: a break of a bone associated
with displacement of the fractured segment from its
intended joint.
dislocation n: pathologic displacement of a bone out
of the natural anatomic boundaries of its fossae. It is
frequently associated with pain, reduced range of
motion of the affected bone, and ligament or cartilage pathosis. It may be chronic or recurrent.
disocclude v: progressive separation of occluding
teeth from maximum intercuspation position during
jaw movements due to tooth guidance, occlusal interferences, or occlusal adjustment
disocclusion n: separation of occluding teeth from
maximum intercuspation position during eccentric
movements.
displacement of the mandible n: a position or movement of the mandible beyond its normal anatomic
boundaries.
distal adj: in a sagittal plane along the midface; a location, movement, or surface that is located toward the
retromolar pads compared with the central incisors.
distal extension partial denture n: The boundaries
of a removable partial denture distal to the terminal
tooth. A removable partial denture prosthesis that
does not have a natural abutment tooth at the distal
aspect either on one or both sides; rather, the distal
tooth at the distal aspect is an artificial tooth provided by the prosthesis.



2016 Glossary

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