Resin modified glass ionomer (RMGI) is a restorative material that is commonly used in dental practices. Unfortunately, a universal method for repairing the material has not been developed. Current practice is to fully remove the original restoration and replace it. During the replacement, however, additional healthy tooth structure is lost. In the present study resin modified glass ionomer was divided into four different environmental conditions, and each environmental condition was subjected to three different surface treatments. The environmental conditions include: five minutes, one week with one thermocycle, five hundred thermocycles, and twenty-four hour delay with five hundred thermocycles. The surface treatments include sanding, sanding and 35% phosphoric acid etchant, and sanding, 35% phosphoric acid etchant, and dental bonding agent. The results suggest that simultaneous exposure to water and temperature change significantly decreased the bond strength of the material. The restorative material, therefore, should be protected by a resin coating during the critical first twenty-four hours. The results also suggest that if the repair occurred immediately no surface treatment would be necessary; however, if the repair does not happen immediately, a resin based bonding agent should be applied.
|Advisor:||Wanda, Paul, Welch, Dan|
|Commitee:||Hopp, Christa, Kohn, Luci|
|School:||Southern Illinois University at Edwardsville|
|School Location:||United States -- Illinois|
|Source:||MAI 53/03M(E), Masters Abstracts International|
|Keywords:||Glass ionomer, Repair of dental materials, Resin modified glass ionomer, Restorative dental materials|
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