Material properties and bioactivity of a resin infiltrant functionalized with polyhedral oligomeric silsesquioxanes. Issue 12 (December 2022)

• Record Type: Journal Article
• Authors: Paiva, MF; Rizk, M.; Pessan, JP; Kreutz, M.; Rohland, B.; Biehl, R.; Stadler, A.; Stellbrink, J.; Wiegand, A.
• Is Part Of: Dental materials. Volume 38:Issue 12(2022)
• Page Start: 1900
• Page End: 1909
• Publication Date: 2022-12
• Subjects: Resin infiltrant -- POSS -- Bioactive fillers -- Degree of conversion -- Viscosity -- Knoop hardness -- Elastic modulus -- Flexural strength -- Enamel and dentin lesion; Dentistry -- Periodicals; Dental materials -- Periodicals; 617.695
• DOI: 10.1016/j.dental.2022.09.020
• Languages: English
• ISSNs: 0109-5641

Abstract

Abstract: Objectives: To investigate the effect of methacrylate polyhedral oligomeric silsesquioxanes (POSS-8) on various material properties and mineral precipitation potential of a resin infiltrant. Methods: A TEGDMA-based resin infiltrant was mixed with 0.5, 1, 3, 5 or 10 wt% POSS-8 or left unchanged (control). Degree of conversion (DC), water sorption (WS), viscosity, elastic modulus (E-modulus), flexural strength (FS), Knoop microhardness (KHN) and softening ratio (SR) were assessed. Growth of calcium phosphate (Ca/P) precipitates infiltrant-treated bovine enamel and dentin specimens immersed in artificial saliva or artificial dentinal fluid, respectively, for 28 days was analyzed by scanning electron microscopy and energy-dispersive X-ray spectroscopy. For viscosity assessment, pure TEGDMA filled with 0–10 wt% POSS-8 was used. Statistical analyses were performed using ANOVA and Tukey's post-hoc tests (p < 0.05). Results: POSS-8 did not change the flexural strength, water sorption and softening ratio. The apparent degree of conversion was increased at lower concentrations only while E-modulus remained constant in almost all groups. The particles led to a slight decrease of KHN at concentrations below 3%. The effect on viscosity is comparable to the reinforcement effect. Ca/P precipitates formed on dentin specimens treated with POSS-8-filled infiltrant after 4 weeks of immersion, but were not detected on the control infiltrant. The mineral precipitation on enamel was not improved by POSS-8. Significance: POSS-8 particles did not worsen the material properties of the resin infiltrant, while the Ca/P precipitation on dentin was stimulated.