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abapical

Overview page. Subjects: Earth Sciences and Geography — Dentistry.

Opposite to or directly away from the apex.

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abarticulation

Overview page. Subjects: Dentistry.

The displacement or dislocation of a bone from its normal position (e.g. the temporomandibular joint).

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Abbé flap

Overview page. Subjects: Dentistry — Plastic and Reconstructive Surgery.

[R. Abbé (1851–1928), American surgeon; J. A. Estlander (1831–81), Finnish surgeon] A full thickness flap of tissue taken from the middle portion of usually the lower lip and transferred to...

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ABCDE

Overview page. Subjects: Dentistry — Sports and Exercise Medicine.

A mnemonic for a step-by-step assessment of an athlete who collapses on the field of play. A = Airway and cervical spine (ensure that the airway is clear; suspect a cervical spine injury if...

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aberrant

Overview page. Subjects: Dentistry.

Deviating from the normal. Usually applied to a blood vessel or nerve that fails to follow its normal course.

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abfraction

Overview page. Subjects: Dentistry.

The loss of tooth structure in the cervical region of the crown of a tooth. Some research studies suggest that this is owing to flexural forces applying an excessive biomechanical loading...

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abrasion

Overview page. Subjects: Dentistry.

1. The non-bacterial loss of tooth tissue due to frictional wear by extrinsic agents. Common causes are toothbrushing, particularly with abrasive pastes, pipe smoking, and...

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abrasive

Overview page. Subjects: Dentistry.

A material used to smooth or roughen a softer material by mechanical wear. It may be delivered in a high pressure stream of air (air abrasion) or by adhesion to strips, discs, wheels, or...

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abscess

Overview page. Subjects: Dentistry.

A localized accumulation of pus in a cavity caused by tissue breakdown as a result of infection or foreign materials. It is a tissue defence reaction to prevent the spread of infection to...

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absorbable gelatin(e) sponge

Overview page. Subjects: Dentistry.

A material applied topically to aid haemostasis, usually following a dental extraction. It provides a structure for clot formation.

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absorption

Overview page. Subjects: Dentistry.

The passage of one substance to another by penetration or solution. For example, the passage of liquids into the mucosa, skin, or dental materials.

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absorption layer

Overview page. Subjects: Dentistry.

An amorphous zone on the dentine surface into which adhesive agents can flow. See also hybrid layer.

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abuse

Overview page. Subjects: Dentistry.

Inappropriate use or treatment of materials, techniques, persons, programmes, or language. See also child abuse.

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abut

Overview page. Subjects: Dentistry.

To touch or border upon. To have a common boundary.

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abutment

Overview page. Subjects: Dentistry.

A tooth, tooth root, or implant used to support a fixed or removable prosthesis (bridge or partial denture). It may provide either the terminal support for a prosthesis or additional...

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acantholysis

Overview page. Subjects: Dentistry.

The breakdown of epidermal or epithelial cells due to a loss of intercellular substance. It is often seen in conditions such as pemphigus vulgaris, where it is caused by autoantibodies, but...

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accelerator

Overview page. Subjects: Chemistry — Dentistry.

A substance that speeds up a chemical reaction, such as the addition of plaster of Paris to mineral trioxide aggregate. Heat may also act as an accelerator in speeding up the setting...

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access

Overview page. Subjects: Dentistry.

An approach or pathway, either natural or prepared, to view, instrument, or treat an area of interest. An access cavity is prepared in a tooth to identify root canal entrances in the pulp...

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Access to Health Records Act 1990

Overview page. Subjects: Dentistry.

(in Britain)

A British act of parliament that established legislation for controlling a patient's access to their written clinical health records. This act has largely been...

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accessory

Overview page. Subjects: Dentistry.

Additional, supplementary, subsidiary to the main thing. An accessory root canal is a branch of the principal root canal frequently occurring in the apical third of the root.

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