Abstract
Aim: To compare the microleakage of Cention N, a subgroup of composite resins with a resin-modified glass ionomer (RMGI) and a composite resin. Methods: Class V cavities were prepared on the buccal and lingual surfaces of 46 extracted human molars. The teeth were randomly assigned to four groups. Group A: Tetric N-Bond etch-and-rinse adhesive and Tetric N-Ceram nanohybrid composite resin, group B: Cention N without adhesive, group C: Cention N with adhesive, and group D: Fuji II LC RMGI. The teeth were thermocycled between 5°-55°C (×10,000). The teeth were coated with two layers of nail vanish except for 1 mm around the restoration margins, and immersed in 2% methylene blue (37°C, 24 h) before buccolingual sectioning to evaluate dye penetration under a stereomicroscope (×20). The data were analyzed by the Kruskal-Wallis and Wilcoxon tests (α=0.05). Results: Type of material and restoration margin had significant effects on the microleakage (p<0.05). Dentin margins showed a higher leakage score in all groups. Cention N and RMGI groups showed significant differences at the enamel margin (p=0.025, p=0.011), and for the latter group the scores were higher. No significant difference was found at the dentin margins between the materials except between Cention N with adhesive and RMGI (p=0.031). Conclusion: Microleakage was evident in all three restorative materials. Cention N groups showed similar microleakage scores to the composite resin and displayed lower microleakage scores compared with RMGI.
Highlights
Class V cervical carious lesions remain a major oral health problem in the elderly and those at high risk of caries[1]
Several factors can affect the marginal adaptation of adhesive restorative materials such as polymerization shrinkage and contraction stress[4,5], and the difference in the linear coefficient of thermal expansion (LCTE) of restorative material and that of tooth structure[6]
The aim of this study was to evaluate the effect of three restorative materials namely an alkasite restorative material (Cention N®; Ivoclar Vivadent, Schaan, Liechtenstein) with and without an adhesive (Tetric® N-bond Vivadent, Schaan, Liechtenstein), a nanohybrid composite resin (Tetric-N® Ceram, Ivoclar Vivadent, Schaan, Liechtenstein), and a resin-modified glass ionomer (RMGI) (GC Fuji II LC®, GC Corporation., Tokyo, Japan) on the marginal integrity of class V restorations submitted to 10,000 thermal cycles using the dye penetration test
Summary
Class V cervical carious lesions remain a major oral health problem in the elderly and those at high risk of caries[1]. RMGI has been recommended for restoration of class V lesions because it has the combined benefits of chemical adhesion to the tooth substrate, fluoride release potential, and caries-preventive effect[2]. Several factors can affect the marginal adaptation of adhesive restorative materials such as polymerization shrinkage and contraction stress[4,5], and the difference in the linear coefficient of thermal expansion (LCTE) of restorative material and that of tooth structure[6]. All these factors can lead to gap formation and marginal microleakage[4,5,6]
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