The Effect Of Heating Glass Ionomer During Hardening On Pulp

Objectives: The main complaint about Glass Ionomer as restoration is low erosion resistance compared to composite restorations.
In order to improve the resistance is recommended to invest energy during hardening the material. Investment energy as heat accelerates the reaction and creates an enhanced initial strength.
The problem can be formed by heating the material is overheating pulp tissue. Has been previously shown that heating above 5.6 ° C caused necrosis in 15% of the permanent teeth that were examined and it was determined the critical temperature limit clinical situations. The purpose of this study is to examine the changes in pulp chamber temperature in permanent and deciduous teeth and use different temperature for different times in relation to the thickness of dentin remnants under restorations.
Methods: The examination was conducted on 20 premolars and 10 deciduous molars.
Preparations were made as occlusal spaces that keep dentin thickness 1 or 2 mm. the pulp chambers were opened from the apex and accurate thermometer was inserted inside. Glass Ionomer, Fuji 9, was inserted into the occlusal space, and during hardening was heated to a temperature of 50⁰C or 60⁰C for 30 or 60 seconds
Results: The temperature in the pulp chamber of the deciduous molars increased higher than the temperature in the premolars , with the same thickness of dentin at 60⁰ caused a rise in temperature of the pulp over the temperature limit in high percentage of teeth, while heating at 50 ° raised the temperature beyond the limit only in the deciduous teeth.
Conclusions: Residual dentin of 1 mm in premolars effectively isolated fixed temperature of 50⁰ , while the residual dentin even of 2 mm not insulated well enough deciduous molars at a temperature of 50⁰.
You can heat the Glass Ionomer at 50 ° during cure only permanent teeth.