| PR | by way of the rectum [Lat. per rectum]; far point [of accommodation] [Lat. punctum remotum]; palindr... |
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| rad | radiation absorbed dose; radial; radian; radical; radius; root [Lat. radix] |
| RC | an electronic circuit containing a resistor and capacitor in series; radiocarpal; reaction center; r... |
| RCT | radiotherapy and chemotherapy; randomized clinical trial; randomized controlled trial; registered ca... |
| RF | radial fiber; radio frequency; receptive field; regurgitant fraction; Reitland-Franklin [unit]; rela... |
| root canal filling materials | Materials placed inside a root canal for the purpose of obturating or sealing it. The materials may be gutta-percha, silver cones, paste mixtures, or other substances. (12 Dec 1998) |
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| root canal irrigants | <chemical> Chemicals used mainly to disinfect root canals after pulpectomy and before obturation. The major ones are camphorated monochlorophenol, edta, formocresol, hydrogen peroxide, metacresylacetate, and sodium hypochlorite. Root canal irrigants include also rinsing solutions of distilled water, sodium chloride, etc. Pharmacological action: anti-infective agents, local. (12 Dec 1998) |
| root canal of tooth | The chamber of the dental pulp lying within the root portion of a tooth. Synonym: canalis radicis dentis, marrow canal, pulp canal. (05 Mar 2000) |
| root canal orifice | An opening in the pulp chamber leading to the root canal. (05 Mar 2000) |
| root canal plugger | Fine-tapered root canal instrument, blunt at the tip, used for pressing or forcing a gutta percha cone into a root canal. (05 Mar 2000) |
| root canal preparation | Preparatory activities in root canal therapy by partial or complete extirpation of diseased pulp, cleaning and sterilization of the empty canal, enlarging and shaping the canal to receive the sealing material. The cavity may be prepared by mechanical, sonic, chemical, or other means. (12 Dec 1998) |
| root canal restoration | A gutta-percha, silver, or plastic cone that has been carried into a root canal, either alone or in conjunction with a cement, paste, or solvent, for the purpose of obturating the canal space. (05 Mar 2000) |
| root canal therapy | A treatment modality in endodontics concerned with the therapy of diseases of the dental pulp. For preparatory procedures, root canal preparation is available. (12 Dec 1998) |
| root canal treatment | The means by which painful or diseased teeth, in which the pulp is involved, are restored to a healthy state, removal of a normal, diseased, or dead pulp by biochemical and mechanical means, enlargement and sterilization of the root canal, followed by filling the canal, to effect healing of diseased periapical tissues, the diagnosis and treatment of diseases of the pulp and their sequelae. Synonym: endodontic treatment. (05 Mar 2000) |
| root cap | <botany> A mass of parenchymtous cells which covers and protects the growing cells at the end of a root; a pileorhiza. The issue found at the apex of roots, overlying the root apical meristem and protecting it from friction as the root grows through the soil. Secretes a glycoprotein mucilage as a lubricant. (18 Nov 1997) |
| root caries | Dental caries involving the tooth root, cementum, or cervical area of the tooth. (12 Dec 1998) |
| root caries index | The ratio of the number of teeth with carious lesions of the root, and/or restorations of the root, to the number of teeth with exposed root surfaces. (05 Mar 2000) |
| root cutting | <botany> Part of a root of a woody plant which, under suitable conditions, takes root and forms a new plant. (09 Oct 1997) |
| root dehiscence | A loss of the buccal or lingual bone overlaying the root portion of a tooth, leaving that area covered by soft tissue only. (05 Mar 2000) |
| root end cyst | An inflammatory odontogenic cyst derived histogenetically from Malassez' epithelial rests surrounding the root apex of a nonvital tooth. Synonym: periapical cyst, radicular cyst, root end cyst. (05 Mar 2000) |