R value

A two-dimensional roughness parameter calculated from the experimental profiles after filtering. Ra: The arithmetic average of the absolute value of all points of the profile, also called central line average height Rt: The maximum peak-to-valley height of the entire measurement trace.

Ramus frame implant

Dental Full arch mandibular implant with a tripodal design that consists of a horizontal supragingival connecting bar with endosseous units placed into the two rami and symphyseal area.


A raptor (i.e. TRI® Raptor) is used as abutment on dental implants to fix a (over)denture as a snap-on. There may be used 2, 4 or even more for one jaw. A variation is the locator. Balls and magnets are used for the same reason, but are not as common.         pictures …

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The surgical reopening of a site to improve or observe results obtained from the initial procedure.

Regional acceleratory phenomenon

RAP A local response to a stimulus in which tissues form 2 to 10 times more rapidly than the normal regeneration process. The duration and intensity of RAP are directly proportional ton the kind and amount of stimulus and the site where it was produced.


Immunological response of incompatibility in a transplanted or implanted material.

Removable prosthesis

Dental restoration that is removable by the patient. The restoration may be partial arch (RPD): Removable partial denture, or complete arch (RCD: Removable complete denture)

Resonance Frequency Analysis

Technique for clinical measurement of implant stability/mobility in bone. The measurement is registered from a transducer attached to the implant. The device records the resonance frequency arising from the implant-bone interface (change in amplitude over induced frequency band) Acro.: RFA


Loss of substance or bone by physiologic or pathologic means.


The human respiratory system cares for gas exchange.  The respiratory surface is internalized as linings of the lungs. Gas exchange in the lungs occurs in millions of small air sacs called alveoli. These microscopic air sacs have a very rich blood supply, thus bringing the air into close contact with the blood. Air has to …

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The nuclear receptor Rev-erbα controls circadian thermogenic plasticity. Gerhart-Hines Z, et al. Nature. 2013. Nature. 2013 Nov 21;503(7476):410-413. doi: 10.1038/nature12642. Epub 2013 Oct 27. Abstract Circadian oscillation of body temperature is a basic, evolutionarily conserved feature of mammalian biology. In addition, homeostatic pathways allow organisms to protect their core temperatures in response to cold exposure. …

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radio frequency identification Radio frequencies are used to read information from a “tag” that can be either “passive” or “active”. A passive tag has no power source while an active tag is supplied with power, usually from a small battery. The method used to communicate with the tags is referred to as “Near Field Communication” (NFC).

Risk groups

There are some risk groups in planning implant surgery, e.g.: Blood disorder, coagulation Tumors Diabetes mellitus HIV Corticosteroids Biphosphonate Medication Bone disorders Dysfunction, Dysgnathia Smokers Handicapped These groups need special planning, special care and contraindication may be wise.


right ventricular assist device A right ventricular assist device (RVAD) pumps blood from the right ventricle or right atrium into the pulmonary artery and to the lungs. A ventricular assist device stabilizes the heart function after injury, such as a heart attack. It’s also used after severe heart failure that does not improve with medicines. …

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