The glossary of prosthodontic terms.

TLDR: A triangular, full thickness flap from the lower lip used to fill in a deficit in the upper lip for the relief of deformity due to double harelip.

Abstract: A Abbe flap \ăb# e flăp\ [Robert Abbe, New York, N.Y. surgeon, 18511928]: eponym for a lip switch operation. A triangular, full thickness flap from the lower lip used to fill in a deficit in the upper lip. Specifically applied to the midportion of the upper or lower lip— called also lip switch operation Abbe, R. A new plastic operation for the relief of deformity due to double harelip. Med Rec 1898;53:477. ab duct \ăb dŭkt#\ vt (1834): to draw away from the median plane— comp ADDUCT ab er rant \ă-bĕr#ant\ adj (ca. 1798)1: a deviation from the normal or usual course, form, or location 2: straying from the normal way ab frac tion \ăb frăk#shun\ n (1991): the pathologic loss of hard tooth substance caused by biomechanical loading forces. Such loss is thought to be due to flexure and chemical fatigue degradation of enamel and/or dentin at some location distant from the actual point of loading—comp ABLATION, ABRASION, ATTRITION, and EROSION ab la tion \ă-bl a#shun\ n (15c) 1: separation or detachment; extirpation; eradication 2: removal of a part, especially by cutting—see ABFRACTION, EROSION abrade \uh-br ad#\ vt (1677): to rub away the external covering or layer of a part—comp ATTRITION, EROSION abra sion \ă-br a #shun\ n (1656) 1: the wearing away of a substance or structure (such as the skin or the teeth) through some unusual or abnormal mechanical process 2: an abnormal wearing away of the tooth substance by causes other than mastication—comp ATTRITION, EROSION abra sive \uh-br a # siv, -ziv\ n (1853): a substance used for abrading, smoothing, or polishing abra sive \uh-br a # siv, -ziv\ adj (1875) 1: tending to abrade 2: causing irritation—abra sive ly adv, abra sive ness n ab ra si vity \uh-br a#siv-ı̆-t e, -ziv-ı̆-t e\ v (1998): the property of one material to wear away another material by means of frictional contact absorbed dose \ab-sôrbd#,-zôrbd# d os\: the amount of energy from ionizing radiation absorbed per unit mass of matter, expressed in Gray units ab sorp tance \ab-sôrp#tans, -zôrp#tans\ n (ca. 1931): the ratio of the radiant energy absorbed by a body to that incident upon it ab sorp tion \ab-sôrp#shun, -zôrp#-\ n (1741) 1: the uptake of substances into or through tissues, e.g., mucosa, skin, and intestine 2: in radiology, the uptake of energy by matter with which the radiation interacts—see A. of RADIATION—comp ADSORPTION absorption of radiation \ab-sôrp#shun ŭv r a#d ea#shun\: collisionlike interactions between the individual particulate or quantum components of a beam of radiation and the subatomic parts of matter that occur at random during irradiation. Each interaction may result in partial or complete transfer of energy abut ment \a-bŭt#ment\ n (1634) 1: that part of a structure that directly receives thrust or pressure; an anchorage2: a tooth, a portion of a tooth, or that portion of a dental implant that serves to support and/or retain a prosthesis—usage see ANGULATED A., HEALING A., DENTAL IMPLANT A., INTERMEDIATE A., ONE PIECE A., PREPARATION PIECE A., STANDARD A., TWO PIECE A. DropB