Airborne-particle abrasion with niobium phosphate bioactive glass on caries-affected dentin: effect on the microtensile bond strength |
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Authors: | Adriana Leal Ceci Carvalho Etevaldo Maia-Filho Valério Monteiro-Neto Monique Carmo Adeilton Maciel |
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Affiliation: | 1. School of Dentistry, Ceuma University (UNICEUMA), S?o Luis, Brazil;2. Biological Sciences Center, Ceuma University (UNICEUMA), S?o Luis, Brazil;3. Biological and Health Sciences Center, Federal University of Maranh?o (UFMA), S?o Luis, Brazil;4. Department of Chemistry (CCET), Federal University of Maranh?o (UFMA), S?o Luís, Brazil |
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Abstract: | This study evaluated the effect of airborne-particle abrasion with niobium phosphate bioglass (NbG) microparticles on the bond strength (μTBS) and longevity of an adhesive system to different dentin substrates. In this study, 18 Caries-free molars were used, of which 12 were microbiologically processed for caries induction. The dentin surfaces were evaluated in three groups: (1) Control – Healthy Dentin; (2) Partial removal of carious tissue; (3) complete removal of carious tissue. Half the teeth in each group were submitted to airborne-particle abrasion with NbG microparticles (15 s/1 cm/5 bar). After this, the adhesive Clearfil S3 was applied and composite buildups were constructed incrementally; and specimens were longitudinally sectioned to obtain bonded sticks (1.0 mm2) to be tested in tension (0.5 mm/min) immediately or after 6 months of storage in water. The fracture patterns were evaluated by stereomicroscope (40×) and then by scanning electron microscopy. The data were analyzed by the Kruskal-Wallis (post hoc Dunn) and Mann-Whitney tests (α = 0.05). Healthy dentin showed the highest bond strength (μTBS). Airborne-particle abrasion with NbG increased the μTBS values in the Group with complete caries removal. The bond strength values in the 24-h period were higher than those at 6 months. In the majority of the specimens the fracture mode was adhesive/mixed. The authors concluded that airborne-particle abrasion on dentin with NbG particles increased the μTBS in the group in which carious dentin was completely removed. |
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Keywords: | Minimally invasive dentistry bioactive glasses dentin reparation microtensile bond strength dental caries dentin adhesive systems |
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