Effect of environmental temperature and humidity on bonding of acrylic resin to enamel.
The bond strength of acrylic resin to enamel is easily affected by moisture, temperature, etc. It is especially true that if there is water on the enamel surface, the bond strength declines drastically. In cases of orthodontic treatment which required bonding of many brackets at once we cannot practice perfect dry field techniques such as with a rubber dam. Accordingly the bond strength of acrylic resin under varying environmental conditions temperature and humidity was measured. The results were as follows; 1) The bond strength of acrylic resin to non-etched enamel was effected by temperature and humidity rather than by liquid/powder ratio. 2) The bond strength of acrylic resin to non-etched enamel declined with an increase in temperature at the same humidity. 3) The bond strength of acrylic resin to etched enamel was effected by the liquid/powder ratio, rather than by humidity when compared with non-etched enamel cases. 4) The bond strength of acrylic resin to etched enamel was not affected by temperature or humidity at a certain liquid/powder ratio. 5) There was no significant difference of formation of resin tags between the liquid/-powder ratio at low temperature and low humidity. Formation of resin tags at high humidity had sharp appearance in proportion to the low liquid/powder ratio.
Kawai
S
S
Itoh
T
T
Matsumoto
M
M
Fukushima
T
T
Horibe
T
T
D000134:Acid Etching, Dental; D000180:Acrylic Resins; D000818:Animals; D002417:Cattle; D001840:Dental Bonding; D003743:Dental Enamel; D006813:Humidity; D008422:Materials Testing; D013696:Temperature; D013718:Tensile Strength
D000180:Acrylic Resins