The phase change and thermal reaction of various types of pit and fissure sealants may be important to find out the autothermograms of pit and thermal stability of those materials.
In this experiment, the autothermograms of pit and fissure sealant were obtained, from which we determined the difference of reaction mechanism according to the compositional change and temperature rise. Three species of light cured resin based
pit
and
fissure sealant, three species of chemically cured resin based pit and fissure sealant, and one species of type III glass ionomer pit and fissure sealant were analyzed by differential thermal analyzer (DTA). The temperature was raised from room
temperature to 700℃ with the heating rate of 20℃/min, and each sample weight was 15 mg.
@ES From the experiment, the following results were obtained:
@EN 1. The pit and fissure sealants studied in this experiment, as the temperature rise, generally showed endothermic transition at low temperature, and exothermic transition at higher temperature.
2. The light cured and chemically cured resin based pit and fissure sealants showed exothermic transition within the range of 207.0℃~244.0℃, and endothermic transition within the range of 480.0℃520.3℃.
3. There was no significant difference in the peak temperature of endothermic and exothermic transition between the light cured and chemically cured resin based pit and fissure sealants (p>0.05).
4. Type III glass ionomer pit and fissure sealant showed exothermic transition within the range of 24.3℃~246℃, endothermic transition within the range of 478℃~486℃, and sercond exothermic transition within the range of 546℃~564℃.
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