Improved Filler-Matrix Coupling in Resin Composites

Yoshida, Yasuhiro; Shirai, Kenichi; Nakayama, Y.; Itoh, Manabu; Okazaki, Masanori; Shintani, Hideaki; Inoue, Sakae; Lambrechts, Paul; Vanherle, Guido; Meerbeek, Bart Van

doi:10.1177/154405910208100409

Cited by 44 publications

(28 citation statements)

References 13 publications

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“…This protocol has been effectively used to stress the filler-matrix interfaces in resin composites (Yoshida et al 2002). Thermal cycling was chosen since it is a nondestructive aging method.…”

Section: Preparation and Characterization Of Hybrid Resin Compositesmentioning

confidence: 99%

Silica Coating of Nonsilicate Nanoparticles for Resin-Based Composite Materials

et al. 2016

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A supplemental appendix to this article is published electronically only at http://jdr.sagepub.com/supplemental. AbstractThis study was designed to develop and characterize a silica-coating method for crystalline nonsilicate ceramic nanoparticles (Al 2 O 3 , TiO 2 , and ZrO 2 ). The hypothesis was that the coated nonsilicate nanoparticles would stably reinforce a polymeric matrix due to effective silanation. Silica coating was applied via a sol-gel method, with tetraethyl orthosilicate as a silica precursor, followed by heat treatment. The chemical and microstructural characteristics of the nanopowders were evaluated before and after silica coating through x-ray diffraction, BET (Brunauer-Emmett-Teller), energy-dispersive x-ray spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy analyses. Coated and noncoated nanoparticles were silanated before preparation of hybrid composites, which contained glass microparticles in addition to the nanoparticles. The composites were mechanically tested in 4-point bending mode after aging (10,000 thermal cycles). Results of all chemical and microstructural analyses confirmed the successful obtaining of silica-coated nanoparticles. Two distinct aspects were observed depending on the type of nanoparticle tested: 1) formation of a silica shell on the surface of the particles and 2) nanoparticle clusters embedded into a silica matrix. The aged hybrid composites formulated with the coated nanoparticles showed improved flexural strength (10% to 30% higher) and work of fracture (35% to 40% higher) as compared with composites formulated with noncoated nanoparticles. The tested hypothesis was confirmed: silanated silica-coated nonsilicate nanoparticles yielded stable reinforcement of dimethacrylate polymeric matrix due to effective silanation. The silica-coating method presented here is a versatile and promising novel strategy for the use of crystalline nonsilicate ceramics as a reinforcing phase of polymeric composite biomaterials.

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Section: Preparation and Characterization Of Hybrid Resin Compositesmentioning

confidence: 99%

Silica Coating of Nonsilicate Nanoparticles for Resin-Based Composite Materials

et al. 2016

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“…Naveen et al 24) found that PMMA reinforced with silanized glass fibers exhibit markedly enhanced flexural strength. Although an improved silane bond was fabricated by hydrosilylation after silanation 30) or application of an acetone primer to the glass prior to silane treatment, such procedures do not solve the problem of slow silane degradation in oral fluids 31,32) .…”

Section: Silane Coupling Agentsmentioning

confidence: 99%

Review of titanate coupling agents and their application for dental composite fabrication

Elshereksi

Ghazali

Muchtar

et al. 2017

Dental Materials Journal

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Silane is a dominant coupler that is widely used in dentistry to promote adhesion among the components of dental composites. Silica-based fillers can be easily silanized because of their similarly ordered structure. However, silane is hydrolytically degraded in the aqueous oral environment and inefficiently bonds to non-silica fillers. Thus, the development of hydrolytically stable dental composites is an important objective in the research on dental materials. Titanate coupling agents (TCAs) exhibit satisfactory interfacial bonding, enhanced homogeneous filler dispersion, and improved mechanical properties of the composites. Titanates also provide superior hydrolytic stability in wet environments, which should be considered in fabricating dental composites. The addition of a small amount of titanates can improve the resistance of the composites to moisture. This paper reviews the effects of the instability of silanes in moisture on the performance of dental composites and presents TCAs as alternative couplers to silanes for fabricating dental composites.

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“…KHN represents the resistance to local deformation due to loading, which is heavily affected by filler load, size, and shape of the resin composite [24][25][26] . UTS, on the other hand, is the maximum resistance to tensile force, which is mainly affected by the structure of the resin matrix and filler-matrix adhesion [27][28][29][30] . In other words, UTS would be more strongly influenced by the polymerization rate of the resin matrix as compared to KHN.…”

Section: Discussionmentioning

confidence: 99%

Effect of Light Irradiation Time on the Mechanical Properties of Two Flowable Composites with Different Initiation Systems in Bonded and Unbonded Cavities

et al. 2007

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The aim of this study was to evaluate the regional mechanical properties of flowable composites with different initiation systems under free and constrained conditions. Forty cavities fabricated in resin blocks with or without bonding treatment were bulk-filled with Estelite Flow Quick (EFQ) or Palfique Estelite LV (ELV), followed by light irradiation for 10 or 30 seconds. Each specimen was sliced to three slabs parallel to the long axis. The middle slab was serially sliced from top to bottom to harvest three sticks for ultimate tensile strength (UTS) measurement. The remaining slabs were polished for microhardness (KHN) measurement. The results indicated that the UTS and KHN of both flowable composites decreased toward the bottom of the cavity and increased with prolonged light irradiation time. At the upper cavity region, UТS values of the bonded groups were significantly lower than those of the unbonded groups, except for the 10-second light irradiation group of EFQ. As for KHN, the values did not change significantly for both flowable composites between the unbonded and bonded groups.

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Improved Filler-Matrix Coupling in Resin Composites

Cited by 44 publications

References 13 publications

Silica Coating of Nonsilicate Nanoparticles for Resin-Based Composite Materials

Silica Coating of Nonsilicate Nanoparticles for Resin-Based Composite Materials

Review of titanate coupling agents and their application for dental composite fabrication

Effect of Light Irradiation Time on the Mechanical Properties of Two Flowable Composites with Different Initiation Systems in Bonded and Unbonded Cavities

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