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J Dent Res 54(1): 146-151, 1975
© 1975 International and American Associations for Dental Research
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Effect of Temperature and Humidity on the Adhesive Strength of Orthodontic Direct Bonding Materials

M. A. KHOWASSAH 1, S. E. BISHARA 1, T. C. FRANCIS 1, and W. HENDERSON 1

1 College of Dentistry, University of Iowa, Iowa City, Iowa 52242, USA, and Burlington, Iowa 52240

The effects of temperature and humidity on the adhesive strength of two direct bonding orthodontic materials were investigated. Tensile testing showed that the adhesive bond was much stronger than the polycarbonate brackets. There is a significant increase in tensile and shearlike strength after 15-, 22-, and 30-day incubation at 37 C and 100% humidity, as compared with initial strength (after 30 minutes) at room temperature.

Submitted on November 12, 1973
Accepted on June 5, 1974






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