Resumo

ZAMORANO PINO, X.; VALENZUELA ARANGUIZ, V.; VIAL PRADO, C.  e  VIDAL TARDON, M.. Microhardness of artificial white-spot lesions infiltrated with low viscosity resins before and after thermocycling. Av Odontoestomatol [online]. 2015, vol.31, n.6, pp.371-378. ISSN 2340-3152.  https://dx.doi.org/10.4321/S0213-12852015000600005.

Introduction: Minimally invasive dentistry, the procedure called Caries Infiltration seeks to stop the progression of incipient caries by sealing the enamel microporosities. This treatment is performed with the application of low viscosity resins. The objective of this work was to evaluate the Microhardness of artificial white-spot lesions infiltrated with low viscosity resins before and after Thermocycling. Methodology: It caused artificial caries by immersion of healthy premolars and molars in a solution of 0,1 M lactic acid (pH 4,5) maintained at 37^oC for 8 weeks. Subsequently, samples were divided into 3 groups and infiltrated with studied resins; Group A: ICON, B: XP-Bond and group C: Single Bond 2. Later, the Microhardness tests were executed by indentation with a Durometer, followed by a process of Thermocycling (1000 cycles), and the Microhardness was measured again. Results: Microhardness (VHN) values obtained were: ICON= 106.9±37.1 and post thermocycling= 139,13±55, XP-Bond 51,01±21.8 and post thermocycling= 103,14±58, and Single Bond 2= 25.4±5.8 and post thermocycling= 26.6±3.5. Discussion: Posterior to thermal cycle (thermal stress) no statistically significant differences were found between groups infiltrated with ICON^® and XP-Bond, instead these differences do exist with respect to the group treated with Single Bond 2.

Palavras-chave : Artificial white-spot lesions; ICON; resin infiltration; microhardness; thermocycling.

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