Amorphous calcium phosphate-containing orthodontic composites. Do they prevent demineralisation around orthodontic brackets?
Abstract
Background
A preliminary study using laser fluorescence suggested that amorphous phosphate-containing orthodontic composites may prevent demineralisation around bonded orthodontic brackets.
Objective
To compare the microhardness of the enamel around brackets bonded with an amorphous calcium phosphate-containing orthodontic composite (ACP-containing) with the microhardness of the enamel around brackets bonded with a conventional composite resin.
Methods
Forty extracted upper premolars were used. Orthodontic brackets were bonded to the teeth with either an ACP-containing composite resin (N = 20) or a conventional composite resin (N = 20). The latter were used as the control. The crowns of all teeth were painted with an acid resistant varnish, leaving a 2 mm ring of exposed enamel around the brackets. The teeth were then subjected to a daily cycle of demineralisation for 6 hours and remineralisation for 18 hours for 21 days. Each tooth was sectioned and the microhardness of the enamel determined 25, 50, 75, 100 and 150 μm from the surface.
Results
The enamel was significantly harder 25 μm (p = 0.000) and 50 μm (p = 0.001) from the enamel surface in the teeth with brackets bonded with the ACP-containing composite resin as compared with the control teeth.
Conclusion
ACP-containing orthodontic composite resins may reduce the enamel decalcification found in patients with poor oral hygiene.
© 2023 Tancan Uysal, Mihri Amasyali, Alp Erdin Koyuturk, Suat Ozcan, Deniz Sagdic, published by Australian Society of Orthodontists Inc.
This work is licensed under the Creative Commons Attribution 4.0 License.