2016 Glossary - 68

crown, coping, bar, or any other suitable rigid support for the dental prosthesis.
template n: a guide or pattern that helps determine
the shape of an object being fabricated or aids tooth
arrangement.
temporary prosthesis n: see under prosthesis.
temporomandibular disorder n: any abnormality
of the temporomandibular joint and/or muscles of
mastication or associated tissues leading to pathologic symptoms or impaired function of the temporomandibular joint. Disorders may be acquired, such
as myofacial pain, disc displacement with or without
reduction, degenerative joint disease, or disorders
acquired from trauma or neoplasms; they may be
developmental, such as those of systemic or genetic origin; or they may be caused by abnormal facial
growth.
temporomandibular joint n: connection between
the condylar head of the mandible and the articular
fossa of the cranial temporal bone. The joint consists
of 2 compartments (upper and lower) separated by
a disc. Movement in the upper joint partition is generally translational, while that in the lower joint partition is typically rotational. The joint is classified as
ginglymoarthrodial, as it is both a hinge and sliding
joint. Also known as the mandibular joint.
temporomandibular joint hypermobility n: pathologically excessive mobility of the temporomandibular joint commonly associated with internal disc
derangement.
tensile stress n: the resistance of a material to longitudinal force, measured by the smallest amount of
longitudinal force required to break up the material;
axial stress that causes elongation of a material along
the direction of the applied force.
tension n: the condition of being stretched or strained.
teratogenesis n: the production of birth defects in a
fetus or embryo.
terminal jaw relation record n: a record of the mandible in relation to the maxilla in the terminal hinge
position.
therapeutic prosthesis n: an appliance that assists in
the treatment of periodontal disease.
68

thermal expansion n: heat-induced expansion of a
material or substance.
thermoplastic adj: the ability of a material to soften
with heat application and harden with cooling.
thread n: a raised helical ridge found on screws, nuts,
and bolts.
thread crest n: the superior or outer portion of a screw
thread.
thread flank n: the portion of a screw thread that joins
the thread root to the screw crest.
thread root n: the apical portion of a thread that comes
in contact with the screw shaft.
thread run out n: the end section of a threaded shank
that is not cut or rolled to full depth providing the
transition between the fastener shank and full depth
threads.
thrombocythemia n: a disorder of blood characterized by overproduction of platelets.
thrombocytopenia n: a disorder of blood characterized by a reduction of platelets.
tinted denture base n: coloration of a denture base
to resemble the natural appearance of oral mucosal
tissues.
tissue n: specialized cells organized into a unit so that
desired or intended functions can be accomplished.
tissue displaceability n: the quality of tissue that allows it to be displaced to a position not achieved by
the natural and relaxed state, different tissues allow
for varying degrees of displacement.
tissue displacement n: alteration in form or position
of tissues that can occur when pressure is applied;
this may alter the accuracy of oral tissue impressions
during impression taking.
tissue integration n: the ability of tissue to attach to
nonliving materials as with the osseous integration
of dental implants, eg, a dental implant
tissue registration n: an obsolete term for the process
of recording the shape of tissues with a material suitable such that distortion does not occur.
titanium n: an element that has qualities making it biocompatible, bioinert, and nontoxic.
titanium alloy n: a mixture of titanium with other elements so as to achieve advantageous qualities. Den-



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