2016 Glossary - 44
metaplasia n: transformation of 1 type of an adult cell
from a normal to an abnormal state.
metastasis n: transmission of pathogenic microorganisms or cancerous cells from 1 body part or organ, via
blood vessels or lymphatics, to other sites elsewhere
in the body that are not directly connected.
microglossia n: having an abnormally small tongue.
micrognathia n: abnormal smallness of the jaw, particularly the mandible, that can be congenital or
acquired. See also mandibular micrognathia and
microstomia n: having an abnormally small oral orifice.
midfacial fracture n: fracture of the middle third of the
face, including zygomatic, maxillary, nasal, and other
associated bones of the midface.
mill in v: a mechanical procedure that involves modifying and refining occluding surfaces by using abrasive
model n: a facsimile representation of something; an
analog or emulation used for display purposes. See
modified ridge lap n: a ridge lap surface of a pontic
that is reduced, shaped, and adapted to only the facial or buccal aspect of the residual alveolar ridge.
modifier n: any substance that changes the color or
properties of a given substance.
mold n: a matrix used to fabricate or duplicate a prosthetic device.
mold chart n: representation of the different dimensions of a denture tooth's (or teeth's) shape and size.
mold guide n: a selection of teeth demonstrating the
dimensions and shape of commercially available
monomer n: the chemical initiator of a polymerization
monoplane m: the occlusal surface of teeth where all
cusp heights are within the same plane.
monoplane articulation n: the arrangement of teeth
in a single plane of occlusion.
monoplane occlusion n: the arrangement of teeth
where tooth contact in all excursions occurs in a single plane of occlusion.
MORA device n: acronym for mandibular orthopedic
repositioning appliance; an appliance designed to
optimize jaw relationships and neuromuscular balance.
morbidity n: the condition of being in a diseased state.
mount v: the laboratory procedure of attaching a cast
to an articulator or cast relater that maintains the
occluded relationship of maxillary and mandibular
dental casts to each other, yet the casts may be separated as the instrument facilitates the opening and
return of the casts to the intended occluded relationship.
mounting n: when maxillary and mandibular dental
casts are attached to an instrument (articulator) that
maintains the occluded relationship of dental casts
to each other, yet the casts may be separated as the
instrument facilitates the opening and return of the
casts to the intended occluded relationship. See also
mounting plate n: removable flat, round components
made of metal or resin that facilitate the attachment
of dental casts to the upper and lower members of
mouth guard n: a removable dental appliance made
of resilient or hard materials that are used to protect
the teeth and surrounding tissues from injury. See
also occlusal guard.
mouth stick n: a prosthesis that is held in position by
the teeth and used by a disabled person to perform
certain functions (eg, as a rod for the purposes of
mucogingival adj: pertaining to the oral mucosa and
gingiva or to the line of demarcation between them.
The keratinized gingiva and adjacent alveolar mucosa tissues cover and protect the alveolar process.
* mucogingival deformity: Abnormal dimension,
morphology, and/or interrelationship between
gingiva and alveolar mucosa.
* mucogingival junction: The meeting point of
the gingiva and alveolar mucosa.
* mucogingival surgery: The intended incision or
cutting of the oral mucosal tissues for the purpose