Hydrothermal and mechanical stresses degrade fiber-matrix interfacial bond strength in dental fiber-reinforced composites

Bouillaguet, Serge; Schütt, Andrea; Alander, Pasi; Schwaller, Patrick; Buerki, Gerhard; Michler, Johann; Cattani-Lorente, Maria; Vallittu, Pekka K.; Krejci, Ivo (2005). Hydrothermal and mechanical stresses degrade fiber-matrix interfacial bond strength in dental fiber-reinforced composites Journal of Biomedical Materials Research Part B: Applied Biomaterials, 76B(1), pp. 98-105. Wiley-Blackwell - STM 10.1002/jbm.b.30349

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Fiber-reinforced composites (FRCs) show great promise as long-term restorative materials in dentistry and medicine. Recent evidence indicates that these materials degrade in vivo, but the mechanisms are unclear. The objective of this study was to investigate mechanisms of deterioration of glass fiber–polymer matrix bond strengths in dental fiber-reinforced composites during hydrothermal and mechanical aging. Conventional three-point bending tests on dental FRCs were used to assess flexural strengths and moduli. Micro push-out tests were used to measure glass fiber–polymer matrix bond strengths, and nanoindentation tests were used to determine the modulus of elasticity of fiber and polymer matrix phases separately. Bar-shaped specimens of FRCs (EverStick, StickTech, and Vectris Pontic, Ivoclar- Vivadent) were either stored at room temperature, in water (37 and 100°C) or subjected to ageing (106 cycles, load: 49 N), then tested by three-point bending. Thin slices were prepared for micro push-out and nanoindentation tests. The ultimate flexural strengths of both FRCs were significantly reduced after aging (p < 0.05). Both water storage and mechanical loading reduced the interfacial bond strengths of glass fibers to polymer matrices. Nanoindentation tests revealed a slight reduction in the elastic modulus of the EverStick and Vectris Pontic polymer matrix after water storage. Mechanical properties of FRC materials degrade primarily by a loss of interfacial bond strength between the glass and resin phases. This degradation is detectable by micro push-out and nanoindentation methods.

Item Type:	Journal Article (Original Article)
Division/Institute:	School of Engineering and Computer Science > Institute for Surface Applied Laser, Phototonics and Surface Technologies ALPS School of Engineering and Computer Science
Name:	Bouillaguet, Serge; Schütt, Andrea; Alander, Pasi; Schwaller, Patrick; Buerki, Gerhard; Michler, Johann; Cattani-Lorente, Maria; Vallittu, Pekka K. and Krejci, Ivo
ISSN:	1552-4973
Publisher:	Wiley-Blackwell - STM
Language:	English
Submitter:	Patrick Schwaller
Date Deposited:	17 Dec 2019 12:29
Last Modified:	17 Dec 2019 12:29
Publisher DOI:	10.1002/jbm.b.30349
ARBOR DOI:	10.24451/arbor.9291
URI:	https://arbor.bfh.ch/id/eprint/9291