In vitro assessment of microleakage and marginal adaptation of class V restorations simulating abfraction lesions
a pilot study
Keywords:
Dental leakage, Marginal adaptation, DentistryAbstract
This in vitro study analyzed class V restorations, simulating abfraction lesions caused by microleakage and marginal fit. Twenty four upper premolars were divided into six groups (n = 4) using the following restorative combinations: G1 = Ketac Molar Liquid/Ketac Molar Easymix, G2 = Primer/ Vitremer, G3 = Adper Single Bond2/Durafill, G4 = Adper Single Bond2/Z100, G5 = Clearfil SE Bond/ Durafill, and G6 = Clearfil SE Bond/Z100. All the teeth were submitted to thermocycling (1000 cycles/ 5°-55°C) and mechanical load cycling (100.000 cycles/8Kgf). After, they were immersed in 0.5% methylene blue dye (pH 7,2) for 4 hours. The specimens were sectioned longitudinally and transversally to obtain two parts. The quality of the marginal sealing was assessed by qualitative (scores) and quantitative (software ImageLab 2000) methods. The results were analyzed using a two-way ANOVA and the Tukey test (5%), presenting a statistically significant difference (p < 0.05) in both methods with lower microleakage values for G1 and G2. There was no significant difference for marginal adaptation among the groups. It could be concluded that glass ionomer and resin-modified glass ionomer cements, as compared to the other tested materials, are more highly recommended for restorations in abfraction lesion areas.
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