2016 Glossary - 28

the sloughing of the oldest nonvital epithelial cells
from the skin's outermost surface; (2) in dentistry, the
physiological shedding of the primary teeth or the
loss of implanted materials.
exogenous adj: due to external source or cause; not
developing from within the organism.
exophytic adj: emergent outward; proliferation on the
outside or surface of an organ.
exostosis n: a benign, bony growth jutting outward
from the normal physiological surface of a bone.
exotoxin n: a toxic substance or matter formed by a
bacterial species that is released to the surrounding
environment.
exposure n: (1) a surgical or dental procedure that uncovers or lays open a desired specific area or object;
(2) in radiology, based on the ability to cause ionization it is a measure of the roentgen rays or gamma
radiati. See also roentgen ray.
external oblique ridge n: a smooth edge or ridge on
the buccal surface of the body of the mandible that
ranges from the anterior border of the ramus, with
lessening prominence, downward and forward to
the region of the mental foramen. This edge or ridge
remains unchanged in size and direction for the
most part throughout life. It is where the buccinator
muscle attaches and affords a consistent landmark
for the construction of dentures and subperiosteal
implants.
extirpate v: (1) to deliberately pull up or out; (2) to completely annihilate or destroy; (3) to surgically remove.
extirpation n: the complete surgical elimination or removal of a tissue or organ.
extracapsular ankyloses n: immobility and consolidation of a joint due to rigidity of any structure external to the joint capsule resulting from disease, injury,
or surgery.
extracapsular disorder n: pain and dysfunction associated with the masticatory apparatus, which is
caused by etiologic factors located outside the temporomandibular joint capsule.
extracortical adj: outside the cortical plate of the bone
or bone cortex.
28

extraoral tracing n: a recording of mandibular movements made with a stylus on a recording plate that
extends outside the oral cavity. A tracing made outside the oral cavity.
extrinsic adj: originating from or positioned without;
outside.
extrinsic coloring n: shading from without; color applied to the exterior surface of a prosthesis.
extrusion n: (1) the overeruption or movement of teeth
outside the desired occlusal plane that may be accompanied by a similar movement of their supporting tissues; (2) squeezing out of material through the
application of pressure, such as denture acrylic escaping from the invested flask as hydraulic pressure
is applied to it.
exudate n: a fluid produced as a result of injury to tissue and/or to a blood vessel. The secreted material
can be made of serum, fibrin, white blood cells, and/
or red blood cells that escape from blood vessels into
a superficial lesion or area of inflammation. The content of the fluid is dependent upon the in situ environment. Serum can be predominant if the exudate
is fabricated by the contraction of a fibrin plug in the
damaged space that releases serum into the area; or
the exudate composition could be primarily made of
polymorphonuclear leukocytes as in the case of pus
formation at an injury site.

F

acebow n: a caliper-like instrument used in
conjunction with the attached facebow fork
to transfer the correct position of the maxillary cast on the articulator such that it replicates the position of the maxillary dental arch to the
temporomandibular joints.
facebow fork n: component attached to the facebow
that transfers the maxillary arch position to the facebow, thus orienting the occlusal table of the dentition to the center of rotation of the condylar joints of
the mandible to a selected anterior point on the face
(eg, the infraorbital fossa).
facebow record n: the registration obtained through
the use of a facebow and facebow fork using 3 points
of orientation (center of rotation of both condylar



2016 Glossary

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