Abrasion is the loss of tooth substance due to friction caused by hard food components.


Acceledent is a product designed to accelerate orthodontic treatment. It is an electrically operated device for intraoral use which transfers the instrument's vibrations directly onto the ...


The Activator was the first “functional orthodontic” brace that has been internationally recognized. Before that there was already the "jumping-the-bite appliance" of Kingsley (1879) and the ...

Active Plate

The active plate is a removable brace for just one jaw that was first devised in the 1920’s and was later improved by A.M.Schwarz. It consists of a plastic body, wire fasteners and active ...

Active plate (Schwartz plate)

In the ‘20s of the last century, A.M. Schwartz developed the later improved, removable appliance he called active plate. In his honour it is often called Schwartz plate in English ...

Active Plate (Single Brace)

First introduced by Charles Nord in 1929 and later improved by A.M. Schwarz, this is a removable brace for just one jaw. It consists of a plastic body, wire fasteners and active ...


: Agenesis is the congenital absence of an organ or organ part. This term refers to the failure of a tooth or several teeth to develop during embryonic growth and development due to the absence of ...


Aligner : Ever since the Positioner first appeared in 1944, it has been possible to provide orthodontic treatment by using plastic, removable braces. Since then, both the Positioner, that resembles ...

Alveolar process

The alveolar process is the part of the jaw that surrounds the tooth roots. When the teeth are lost, the alveolar processes recede and only the jawbone bases remain.

Alveolar socket

The alveolar socket is the bony compartment of the tooth root.

Angle Classification

The Angle Classification was conceived by E. H. Angle, the founding father of orthodontics, for classifying orthodontic deviations after the first molars have appeared: Angle-Class I refers to a ...


The term angulation refers to the angular position of the dental crown or root, mostly in a mesiodistal direction.


This refers to the growing together of the tooth root with the jaw bone. If this occurs during the growth phase, it results in the affected tooth not being able to keep up with the jaw growth and ...


A tooth is called antagonist which is opposite to another tooth and makes contact.


In dentistry, the root tip is called apex.


Apical is a directional term for: in the direction of the root tip.


Aplasia is the congenital absence of an organ or organ part. In dentistry, this term refers to the natural non-development of teeth. See agenesis


Abbreviation for Air Rotor Stripping. In American English a common name for interproximal enamel reduction with a high-speed angled handpiece.


Arthritis refers to the inflammation of joints which is usually associated with pain and functional impairments.


Arthroscopy is the examination of a joint with a slim optic device directly introduced under anesthesia. The arthroscopy of the temporomandibular joint is an occasionally useful examination ...


Arthrosis is a degenerative joint disease characterized by the disappearance of cartilage covering the healthy joint surfaces. In most cases, arthritis (joint inflammation) which leads to the ...


The articulator is a hinged rack for assembling jaw models and simulating jaw function. It’s necessary for making dental prostheses in the orthodontic laboratory. At the height of Gnathology, ...


In German the abbreviation ASR is used for interproximal enamel reduction, see there.


Regarding the orthodontic treatment with aligners, attachments are used as small plastic buttons on the teeth which improve aligner retention.


Attrition is the loss of tooth substance due to tooth-to-tooth friction, e.g. with teeth grinding or pressing.