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1 Departments of Orthodontics, Restorative Dentistry, and Oral Biology, School of Dentistry, and Center for Research in Oral Biology, University of Washington, Seattle, Washington 98195, USA
The use of ultrasonic energy to remove excess ZnPO4 cement from orthodontic bands reduces the solubility of the cement but does not affect band adhesion unless excessive band contact is made. Excessive band contact weakens band-to-tooth adhesion. The solubility of the cement is increased by decreasing the pH and is increased when organic anions capable of binding metal ions are present.
Submitted on June 10, 1974
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