Reimplantation
Insertion and temporary fixation of partially or completely avulsed tooth or teeth, resulting from traumatic injury.

Reline
Acrylic restoration of denture base to compensate for bone loss; direct done at chairside; indirect in conjunction with a dental laboratory.

Restoration
Replacement of portion of a damaged tooth.

Retained Root
Partial root structure remaining in jaw after extraction or fracture of a natural tooth.

Root
Tooth structure that connects the tooth to the jaw.

Root Canal
Common term for root canal therapy, also the interior space of the tooth root.

Root Canal Therapy
Process of removing pulp of a tooth and filling it with an inert material.

Root Rresection
Removal of a portion of diseased root structure, retaining the remaining natural tooth.

Rubber Dam
Soft latex sheet used to establish isolation of one or more teeth from contamination by oral fluids and to keep materials from falling to the back of the throat.