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In dentistry, glass ionomers--a type of restorative dental material--bond chemically with tooth enamel and dentin via ionic exchange. As a result, glass ionomers do not require acid etching to bond to enamel.
Source:
Journal of Orthodontics: Glass Ionomer Cement
DoctorSpiller.com: Dental Composite Information
Main Street Dental: Alternatives to Amalgam
More Information:
American Dental Association: Restorative Dental Materials A-Z
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