Abstract
Objectives. To measure the temperature increase induced during thermocure lamp setting reaction of glass carbomer and to compare it with those induced by visible light curing of a resin-modified glass ionomer and a polyacid-modified composite resin in primary and permanent teeth. Materials and Methods. Nonretentive class I cavities were prepared in extracted primary and permanent molars. Glass carbomer (GC) was placed in the cavity and set at 60°C for 60 sn using a special thermocure lamp. Resin-modified glass ionomer (RMGIC) and polyacid-modified composite resin (PMCR) were placed in the cavities and polymerized with an LED curing unit. Temperature increases during setting reactions were measured with a J-type thermocouple wire connected to a data logger. Data were examined using two-way analysis of variance and Tukey's honestly significant difference tests. Results. The use of GC resulted in temperature changes of 5.17 ± 0.92°C and 5.32 ± 0.90°C in primary and permanent teeth, respectively (p > 0.05). Temperature increases were greatest in the GC group, differing significantly from those in the PMCR group (p < 0.05). Conclusion. Temperature increases during polymerization and setting reactions of the materials were below the critical value in all groups. No difference was observed between primary and permanent teeth, regardless of the material used.
Highlights
Heat production is the most severe stress generated in the pulp by various operative procedures [1]
The temperature increases induced during thermocure lamp setting reaction of a glass carbomer (Glass Fill) and induced by visible light curing of a resin-modified glass ionomer cement (Fuji II LC) and a polyacid-modified composite resin (Dyract AP) in primary and permanent teeth were investigated (Table 1)
The use of Glass carbomer (GC) and the CarboLED lamp resulted in temperature changes in permanent and primary teeth of 5.17 ± 0.92∘C and 5.32 ± 0.90∘C, respectively (p > 0.05)
Summary
Heat production is the most severe stress generated in the pulp by various operative procedures [1]. Several in vitro studies have shown that various light sources used during the polymerization of resin-based restorative materials cause such increases in pulp temperature [4, 5]. Improvements in restorative materials and techniques, together with increased demand for aesthetic restorations, have led to the introduction of a wide range of dental materials, including compomer, resin-modified glass ionomer cements, and self-adhering composites. These materials contain variable proportions of resin matrix. The authors demonstrated exothermic temperature increases during the setting of resin-modified glass ionomer (RMGIC) and polyacid-modified composite resin
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