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Standards Development
This document specifies test methods to examine the shear bond strength of adhesives for orthodontic attachments on human teeth and bovine teeth.
The test is performed by testing the overall bond between the attachment, adhesive and tooth enamel.
Orthodontic attachments are usually attached to patients' teeth for treatment using adhesives of various types. The orthodontic attachments (e.g. brackets) can be made of metal, ceramic or plastic. The bond between the adhesive and the attachment or between the adhesive and the tooth enamel can be of a physical and/or chemical nature. It should not become loose during orthodontic treatment, as far as possible. Once the treatment is complete, however, it shall be possible to remove the attachment from the tooth using appropriate orthodontic forceps/instruments without causing unacceptable damage to the enamel or the tooth. The attachments are removed by the clinician by applying tensile or shear force (usually a combination of both) to the adhesive bond.
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