2016 Glossary - 39

J

aw n: either of 2 bony structures (maxilla or
mandible) that are intended to bear natural
teeth or support prosthetic teeth.
jaw malposition n: abnormal or anomalous

position of the mandible.

jaw relation n: any relationship of the mandible to its
opposing maxilla.
joint n: where 2 or more skeletal bones meet (intersect); functions to allow the movement of the individual bones. See also temporomandibular joint.
junction n: the process of joining together, as in 2 different structures.
* cementodentinal junction: the zone where the
dentin and cementum meet.
* cementoenamel junction: the zone where the
cementum and enamel meet at the cervical section of the tooth.
* dentinoenamel junction: the zone where the
dentin and enamel meet.
* mucogingival junction: the zone where the gingiva and alveolar mucosa meet.
junctional epithelium n: found at the base of the
gingival sulcus, it is a single layer or multiple layers
of nonkeratinized epithelial cells that adhere to the
tooth surface at this location. A calibrated periodontal probe is used to measure the depth of this gingival sulcus. Also known as epithelial attachment.
juvenile periodontitis n: a deteriorating periodontal
disease found in adolescents in which the periodontal damage is greater than what would normally
be expected when considering the localized irritating factors found on adjacent teeth; inflammatory
changes become excessive leading to observed
bone loss, tooth migration, and/or extrusion. See
also periodontitis and the subcategory aggressive
periodontitis.
juxtaposition n: 2 things placed side by side or in close
proximity.

K

eeper n: a device used for holding something
in a desired position. In dentistry, this is typically understood to mean a magnetized alloy fixed to 1 component of a restoration to
which a magnet may adhere.
Kennedy classification of removable partial dentures n: the most widely accepted and used classification system for removable partial dentures. Kennedy classification is based on the location of the
missing teeth.
* Class I: characterized by bilateral edentulism located distal to the remaining natural teeth.
* Class II: characterized by unilateral edentulism
distal to the remaining natural teeth.
* Class III: characterized by unilateral edentulism
when natural teeth are located both mesially and
distally to the edentulous area.
* Class IV: observed when the edentulism is located mesially to the natural teeth.
keratinized gingiva n: the portion of the gingiva extending from the mucogingival junction to the gingival margin.
keratocyst n: a cutaneous cyst that is similar to an epidermoid cysts but is not limited to a specified location on the body. They are frequently reported in
persons with nevoid basal cell carcinoma syndrome.
keratosis n: a horny, keratinous growth, particularly on
the skin. Also known as a wart or callus.
keyway n: an interlock connection that uses a matrix
and patrix between the units of a fixed dental prosthesis. Once it is soldered in place it holds the pontic
in its proper relationship to the edentulous ridge and
the opposing teeth and reinforces the connector.

L

abial adj: of or relating to the lip.
labial flange n: the ridge, edge, or projection
of a denture that is positioned toward the vestibule located on the lip side of the mouth.
labial vestibule n: the segment of the oral cavity that
is anterior to the bicuspids and lies between the lips
and the adjacent teeth or the corresponding edentulous residual ridge.
JOI Glossary

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