2016 Glossary - 71

treatment plan n: the recommendations for a patient
to follow to improve oral health after a comprehensive examination and diagnosis.
trephine n: hollow rotary circular instrument that removes a disk or cylinder of bone or tissue; it can be
used to create a trough around an endodontic post
to assist in its removal from a natural tooth or to remove a dental implant from bone.
trial base n: a device or material that represents the
base of a removable dental prosthesis and usually
has an attached wax rim. The device is, used to record the maxillomandibular relationship for the purpose of setting denture teeth in their proper functional and esthetic location.
trial denture n: placement of teeth, usually in wax, to
evaluate the proposed maxillomandibular relationships, esthetics, and function of the prosthesis.
trial flask closure n: preliminary closure of a dental
prosthesis processing flask that ensures that the
mold is completely filled with finishing material and
allows excess material to be eliminated.
trial placement n: a setup of denture teeth (usually in
wax) on a base material so that a try-in denture may
be placed in the patient's mouth to verify esthetics
and necessary records or to verify any other necessary steps before completion of the denture.
tricalcium phosphate n: an inorganic porous particulate biodegradable ceramic material made up of a
calcium-phosphate mixture and used as a scaffold
for bone regeneration.
trifurcation n: tooth root that is divided into 3 distinct
individual roots.
trigeminal adj: concerning the fifth cranial nerve
(trigeminal nerve).
tubercle n: a small, rounded, bony nodule, eminence,
or projection.
tuberosity n: a projection or protuberance on a bone
that often serves for the attachment of muscles.
tunnel dissection n: a surgical procedure in which the
periosteum is dissected from bone through a small
opening made by an incision; access to the desired
bone site is through a tunnel-like opening under the
soft tissue.

tunnel preparation n: a surgical procedure implemented on a multirooted tooth (usually mandibular
molar) that results in a totally opened furcation. The
procedure is performed to allow easier and complete
access to the area between the roots for the purpose
of oral hygiene and improved tissue health.
turgid adj: swollen and distended or in a state of congestion.
typodont n: a model used in training dental students
that represents the oral cavity. The model includes a
replica of the natural dentition and alveolar mucosa and is set to average condylar movements. Also
known as a typodent.

U

CLA abutment substand n: an informal
term used to describe a screw-retained dental crown that is screwed directly into the
implant body without an intervening abut-

ment.
ulcer (ulceration) n: a lesion on the surface of skin or
mucosa that is usually associated with inflammation
that results in the loss of soft tissue integrity in the
area. It is characterized by absence of the epithelium.
ultimate strength n: the maximum stress a material
can withstand at its point of rupture. Also known as
ultimate tensile strength
ultrastructure n: the detailed structure of a biological
specimen that is beyond the resolution power of
the light microscope; eg, it may be observable using
electron microscopes or technologies that provide
greater resolution.
ultraviolet adj: a wavelength of electromagnet radiation that is shorter than the violet end of the visible
spectrum but longer than that of X-rays. Normally it
refers to wavelengths <380 nm.
undercut v: to create irregular areas that provide mechanical retention for dental material placement.
undulate adj: a surface that may be irregular, wavy,
surged, swollen, heaved, rippled, billowed, flowing,
or rolled. Can be used to describe a colony of microorganisms.
uniform color space n: if a color space is perceptually
uniform, it means a change of length x in any direcJOI Glossary

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