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* bone resorption: bone loss resulting from osteoclastic activity.
* cavernous resorption: bone loss that leaves a
hollow space (decreased bone volume).
* idiopathic resorption: loss of calcified tissues for
no obvious reason.
rest jaw relation n: an obsolete term for the relationship of the mandible to the maxilla when the patient
is in an upright relaxed position and proper physiologic interocclusal distance exists between the teeth
as the condyles are resting in the glenoid fossae.
restoration n: any material that replaces lost tooth
structure or soft tissue.
rest seat n: area prepared on a tooth surface or restoration to support vertical or lateral occlusal forces.
rest vertical dimension n: distance measured between a predetermined point on the maxilla and
mandible when the mandible is in physical rest position. One point is on the middle of the face or nose
and the other point is on the lower face or chin. See
also vertical dimension.
retainer n: device used to stabilize teeth in the desired
position; it is usually an orthodontic appliance.
retention n: (1) in orthodontics, the preservation and
stabilization of the teeth in the desired position into
which they were moved; (2) in prosthodontics, holding the removable prosthesis in the proper position;
(3) in restorative dentistry, capability of a tooth preparation or tooth placement to oppose movement in a
vertical or lateral direction.
retention arm n: extension of metal or plastic arm to
add stability to a dental prosthesis.
retention form n: retention obtained from precise intentional tooth reduction that resists dislodgement
of a crown.
retention of the denture n: an obsolete term that refers to denture retention obtained by utilizing bony
undercuts covered with tissue.
reticular fiber n: see under fiber.
retractor n: instrument used to hold soft tissue away
from bony structures in order to visualize an area
during surgery or to photograph an area.

retrofilling n: apical reflection of soft tissue and bone
to expose the root tip where a preparation is made
and filled with material to seal a root canal.
retrognathic n: position of the mandible in relationship to the maxilla where the mandible is retruded
from its normal position.
retrognathism n: position of mandible and/or maxilla
that is posterior to its normal craniofacial relationship. Typically refers to the mandible.
retromolar pad n: mass of freely movable, nonkeratinized mucosa tissue located posterior to the retromolar papille of the most distal tooth in the mandible.
retromylohyoid area n: an obsolete term referring
to the area located lingual to retromolar tissue pad
extending inferiorly toward the floor of mouth and
distally to the retromylohyoid curtain.
retruded contact n: the contact that occurs during the
closure of the mandible in its most retruded path of
closure.
retruded contact position n: the occlusal relationship
that occurs when the mandible and the condyles are
in their most retruded position. This position may be
more retruded than the position referred to as centric relation.
retrusion n: movement of the mandible directed posteriorly.
retrusive adj: a mandibular position that may be more
distal than that described as maximum intercuspation.
reverse articulation n: positioning of the mandibular
teeth that is more buccal than normal relative to the
maxillary teeth such that the fossae of the mandibular teeth articulate with the buccal cusp of the maxillary teeth.
reverse articulation teeth n: artificial teeth that are
shaped to allow for the buccal cusp of the maxillary
teeth to be arranged in the central fossae of the mandibular teeth.
reverse curve n: when viewed in the sagittal plane, the
occlusal plane position as outlined by the cusp tips
and incisal edges of the teeth is curved upward.
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