2016 Glossary - 63
root preparation n: see under root.
root proximity n: see under root.
root resection n: see under root.
root resorption n: see under root.
root retention n: see under root.
root submergence n: see under root.
rouge n: a material made of ferric oxide and binding
agents used for polishing and thereby imparting luster to a surface.
RPI: abbreviation for the rest, proximal plate, and I-bar,
which are the clasp portion of a removable dental
ruga (pl, rugae) n: anatomic ridges of soft tissue that
are frequently present on the surface in the anterior
portion of the hard palate.
callop n: one of a series of continuous circles.
scatter radiation n: any radiation that is not
absorbed by the target tissues. This radiation
may pass through or be deflected by the tissue. The unabsorbed radiation may then collide with
nearby objects or personnel.
sclerosis n: an induration, thickening, or hardening of
a body part, usually induced by a chronic inflammatory reaction or by hyperplasia of interstitial fibrous
connective tissue. When found in the jaws it is depicted by an increased calcification as found in condensing osteitis.
screw endosteal dental implant n: a sterile device
that is placed into the jaw bones for the attachment
or retention of a tooth or teeth and whose configuration is similar to a screw; it may be hollow or solid,
and normally consists of the fixture and the abutment.
sebaceous adj: relating to or resembling fat or sebum;
oily; fatty; discharging fat or a grease-like oil substance.
second-stage dental implant surgery n: (1) regarding eposteal dental implant surgery, it is the surgical procedure involving placement of an eposteal
framework constructed from the first-stage implant
surgery impression; (2) regarding endosteal dental
implant surgery, it involves the surgical reflection of
soft tissue to uncover the superior (tabletop) aspect
of the dental implant, the cover screw is removed,
and either the healing collar or the interim or definitive dental implant abutment is placed. After this, the
relevant tissues are sutured in place as needed.
sectional impression n: a process of capturing, in segments or parts, any anatomic area using a material
that will produce a negative likeness of the area of
sedation, conscious n: a minimally depressed level of
consciousness induced for anxiolysis and fear management that allows the patient to independently
maintain an airway and respond appropriately to
physical stimulation and verbal commands.
Seibert classification n: a system of 3 categories used
to describe the form of a residual alveolar ridge.
* Class I defect: loss of tissue width in the facial-lingual or buccal-lingual direction but there is adequate ridge height.
* Class II defect: loss of ridge height but there is adequate ridge width.
* Class III defect: loss of both ridge height and width.
Selenomonas sputigena n: gram-positive, anaerobic, rod-shaped bacteria, mainly from subgingival
plaque, that displays a tumbling motility.
self-separating plaster n: an obsolete term for an impression plaster that disintegrates in hot water.
semiadjustable articulator n: an articulator that allows adjustments to replicate typical mandibular
movements. See also Class III articulator.
semiprecious metal alloy n: an alloy made of both
base and precious metals. No specified ratio of components distinguishes 1 group of semiprecious alloys from another group.
separating medium n: (1) a coating used to keep 1 surface from adhering to a second surface; (2) a material
applied on an impression that aids removal of the
cast once it has set (hardened).
sepsis n: unsafe quantities of pathogenic microorganisms or their products in blood or tissues.
septicemia n: systemic disease initiated by the presence of pathological microorganisms or their toxins
in the blood.