2016 Glossary - 62

reversible hydrocolloid n: gels that solidify by cooling
and return to a flowable state when the temperature
is increased.
reversible splint n: a device used for, or method of,
splinting or fixing teeth that does not change or alter
the structure of the involved teeth.
ridge n: in dental applications, it refers to a residual
dental arch that is a crest of bone covered by soft tissue in its natural state.
ridge augmentation n: a procedure used to increase
the size, shape, or quality of an edentulous dental
ridge or space that has typically lost ideal contour
after the loss of the dentition (or failure to develop
dentition).
ridge crest n: the most highly contoured part of an
edentulous dental ridge.
ridge lap n: the tissue approximating portion of an artificial tooth or prosthesis that has been shaped so
as to overlap the residual ridge and extends from the
buccal to the lingual surfaces.
ridge relationship n: the position of the mandibular
ridge relative to the maxillary ridge.
ridge slope n: an obsolete term referring to the angulation established by the crest of the mandibular
ridge extending from the posterior region toward
the anterior area relative to the inferior border of the
mandible.
rigid connector n: part of a removable prosthesis that
connects its parts or, in regards to a fixed prosthesis, a portion of the device that connects the retainer
to a pontic in such a manner that no movement can
occur.
ringless investment technique n: a method of investing such that no containment is used that may restrict expansion. A paper or plastic cylinder may be
used that is less restricting than a metal cylindrical
casting ring.
roentgen ray n: (1) radiation emitted from a tube that
results from striking an anode with electrons emitted from a heated cathode; (2) radiation resulting
from the excitation of the innermost orbital electron
within an atom.
62

root n: the part of a tooth that is typically covered by
cementum and is found in the more apical portion.
Attached to it is usually a periodontal ligament that
allows for connection to the adjacent bone.
* root concrescence: the fusion of roots of adjacent teeth.
* root fragment: a part of a tooth that may be retained after an attempt at extraction or that may
result from partial resorption of a tooth.
* root fusion: the connection of roots of a multirooted tooth.
* root planning: a method of removing contaminated or attached material that may be rough or
polluted with toxins or microorganisms.
* root preparation: the use of chemical or mechanical means to remove contaminants from a
root to improve wound healing.
* root proximity: the distance between adjacent
roots.
* root resection: removal of a portion or all of a
tooth's root.
* root resorption: loss of part of a root relating to a
process that may be idiopathic or may result from
tooth movement, trauma, endocrine disorders,
inflammation, or neoplastic disease.
* root retention: preservation of a root, frequently
endodontically treated, after the coronal portion
has been removed in order to support a prosthesis or preserve the alveolar ridge.
* root submergence: process of covering a tooth's
root with soft tissue.
root concrescence n: see under root.
root form endosteal dental implant n: an implant
used in dental applications that is placed into the
bone and has some degree of similarity to a natural
root. See also implant, oral.
root fracture n: a fracture, split, or breaks in the otherwise solid part of a tooth that is typically covered by
cementum and is found in the more apical portion
(root of the tooth).
root fragment n: see under root.
root rusion n: see under root.
root planning n: see under root.



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