Month: January 2020
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Actinomyces israelii
A gram‐positive, nonmotile, facultatively anaerobic, pleomorphic bacterium. It is commonly found in the soil but can also be found in dental plaque and the intestinal tract of mammals. It is typically a commensal bacterium. Causative organism of human actinomycosis. Tissue growth occurs as colonies of Gram-positive myceUum 0.8 -1.0 jam thick, with the filaments interlaced…
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Actinobacillus (actinomycetemcomitans)
Gram‐negative, fermentative, nonmotile, coccoid or rod‐shaped bacterium of the family Pasteurellaceae, part of the normal mammalian microflora. This bacterium has been associated with periodontal infections and, in particular, early‐onset, aggressive forms of periodontal disease. Genus within the family of Brucellaceae. Gram-negative non-motile aerobic rods associated mainly with animal disease. Carbohydrate fermenters, no gas production. Micro-aerophilic…
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Acrylic restoration
Tooth or other prosthetic restoration fabricated from acrylic resin, such as an acrylic crown.
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Acrylic resin veneer
Usually referring to fixed dental prosthesis, the veneering or lamination of the facial and/or buccal surfaces of a crown or fixed dental prosthesis using acrylic resin. The intention of such veneering is to provide a natural tooth color to the viewable portions of the restoration.
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Acrylic resin
Any of a group of thermoplastic resins made by polymerizing esters of acrylic or methyl methacrylate acids.
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Acquired immunity
Specialized form of immunity involving antibodies and lymphocytes. Active immunity develops after exposure to a suitable agent (e.g., by an attack of a disease or by injection of antigens), and passive immunity occurs with transfer of antibody or lymphocytes from an immune donor. The major component of the immune system associated with the formation of…
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Acid etching
Act of modifying an implant surface by exposure to an acidic medium with the intention of enhancing osseointegration. A dental procedure used to prepare the surface of tooth enamel for better retention in bonding material to the tooth structure. Phosphoric acid is placed on the enamel surface. The acid removes the organic portion of the…
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Acid‐etched surface
Treatment of a surface with an acid in order to increase its surface area by subtraction.
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Acid‐etched implant
External surface of an implant body that has been modified by the chemical action of an acidic medium. The subtractive surface is intended to enhance osseointegration.
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Acetaminophen
Amide of acetic acid and p‐aminophenol, a nonopioid analgesic and antipyretic drug, which may be administered orally or rectally. An active ingredient in some non-prescription drugs that relieve pain and reduce fever. Is taken for headaches and other pains as a preference to aspirin. An over the counter drug that reduces headache, fever, and inflammation.…