2016 Glossary - 11
cementum fracture n: the tearing or splintering of the
cementum from the tooth's root surface. Superficial
disruptions of a tooth root that result in the displacement of cementum fragments.
center of ridge n: the midline of the residual ridge in a
buccolinigual dimension, as viewed from the occlusal aspect.
central bearing n: a device that applies a single point
force that is applied as centrally as possible at the
center of support between the maxillary and mandiblular jaws. It distributes the closing forces evenly
throughout the supporting structures when recording maxillomandibular jaw relationships. It is also
used to detect errors in occlusion.
central bearing point n: the precise location of contact for a central bearing device.
central bearing tracing n: the recorded path of motion on the horizontal plate of the central bearing
central bearing tracing device n: a device that is used
to balance occlusal forces when measuring maxillomandibular jaw relationships or to map the full envelope of mandibular movement. It consists of a plate
attached to a dental arch and a tracking device that
centric n: (1) located in or at a center; (2) oriented
around or directed toward a center.
centric occlusion n: the maximum balanced intercuspation of maxillary and mandibular teeth; may or
may not coincide with centric relation.
centric position n: the position of the mandible in either centric occlusion or centric relation.
centric relation record n: a registration of the relationship between the maxilla and mandible when
the mandibular condyles are in centric relation. The
record may be taken intraorally or extraorally.
centric stop n: occlusal contacts of opposing teeth that
maintain the occlusal vertical dimension between
the maxillary and mandibular arches.
cephalometric radiograph n: a standardized radiograph of the head used for making cranial measurements.
cephalometric tracing n: a line diagram that is a copy
of the structural landmarks of the orthodontically
relevant craniofacial markers and facial bones. It is
made by drawing on a thin paper sheet placed on
a cephalometric radiograph through which light is
cephalometry n: (1) the science of measuring the dimensions of the head; (2) in dentistry, it is determining the permutations of angles, lines, and planes that
are derived from tracings of landmarks on frontal and
lateral radiographic head films. The measurements
are used to assess growth, development, and treatment responses of the craniofacial bones as it relates
to diagnosis, in-treatment evaluations, or completed
orthodontic treatment. cephalometric adj.
cephalostat n: a device used to precisely and predictably position the head so as to create spatially oriented and reproducible radiographs or photographs.
ceram n: a fine-grained glass-ceramic material that is
derived from applying heat to a specific form of glass.
ceramic n: (1) a broad class of materials made from a
variety of nonmetallic compounds with a metallic
component, which are fired at high temperatures to
achieve their physical characteristics of high hardness, brittleness, low thermal and electrical conductivity, and high corrosion resistance. They are generally oxides but can also be composed of calcium
phosphates, alumina, zirconia, nitrides, borides, carbides, silicides, and sulfides, alone or in combination
with glass or metals (cermets). In dentistry, the term
is used liberally to include all materials that mimic the
optical qualities of natural tooth structure or gingivae and have the characteristics of this class. They are
also sometimes used as synthetic osseous grafting
materials and biocompatible surface coatings; (2)
adj: of or relating to the application of ceramics.
ceramic crown n: (1) a fixed dental prosthesis, fabricated entirely with ceramic materials. It is cemented,
bonded, or screwed to an underlying implant fixture,
abutment, or framework; (2) a fixed dental prosthesis
that is fabricated entirely with ceramic materials and
cemented or bonded to an underlying natural tooth.
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