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Anatomic ridges of soft tissue that are frequently present on the surface in the anterior portion of the hard palate. A fold or ridge, especially in a mucous membrane such as the lining of the stomach.  

Highly sensitive nerve ending of the periodontium in close approximation with collagen fibers that allow refined proprioception around teeth.  

Removal torque value (reverse torque value).  

Reverse torque test.  

Revolutions per minute.  

Rest, proximal plate, and i‐bar; the clasp components of one type of partial removable dental prosthesis clasp assembly.  

Removable partial denture (now termed a partial removable dental prosthesis).  

Circular bur used to mark a site for an osteotomy or to decorticate bone. It may also be used in the outline of a lateral window access for the purpose of sinus grafting.