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Title Characterisation and Performance of Fibre-Reinforced Composite Restorations
URL
Publication Date
Degree Level doctoral
University/Publisher University of Manchester
Abstract In the modern era of metal-free minimally-invasive dentistry, there is a growing tendency toward using metal-free restorative alternatives that provide not only excellent aesthetics but also enable superior durability. Fibre-reinforced composite (FRC) is one cost-effective alternative that fulfils the requirements of aesthetics and durability, and offers favourable physico-mechanical properties. Many FRC applications are well-documented in the literature, such as crowns and fixed partial dentures (FPD); however, their clinical implementation is still limited, owing to the lack of significant knowledge about their longevity, deterioration signs, optimum design and overall performance. This in-vitro research aimed to address these uncertainties by investigating the performance of FRC restorations, and the influence of fibre reinforcement on particular physcio-mechanical properties, including surface hardness, edge-strength, shear bond strength, fatigue and wear resistance.Basic testing models were used to investigate the effect of incorporating differently-oriented FRCs on the surface hardness, edge-strength and shear bond strength of particulate-reinforced composite (PRC). The results revealed that the incorporation of FRC significantly enhanced surface hardness (by 12 - 19 %) and edge-strength (by 27 -75 %). However, this incorporation significantly reduced the shear bond strength (SBS) between PRC and other restorative materials, including lithium disilicate ceramic (10.9±3.1 MPa) and Co-Cr metal alloy (12.8±2.3 MPa), compared to the control (15.2±3.6 MPa, 15.0±3.7 MPa). The orientation of FRC was also found to affect the efficiency of reinforcement as bidirectional FRCs exhibited significantly higher hardness (76.8±1.2 VHN), edge-strength (67.7±8.2 N) and SBS (14.1±3.9 MPa) values than unidirectional FRCs (72.4±1.2 VHN, 56.8±5.9 N, 9.8±2.3 MPa).Clinically-relevant testing models, employing accelerated aging techniques, were performed to investigate the fatigue and wear behaviours of anatomically-shaped FRC restorations in-vitro. Direct inlay-retained FRC-FPDs with two framework designs, were tested for their fatigue behaviour and load-bearing capacity. Type-I design (with an additional bidirectional FRC layer incorporated perpendicular to the loading direction) yielded significantly higher fatigue resistance (1144.0±270.9 N) and load-bearing capacity (1598.6±361.8) than Type-II design (with a woven FRC embedded around the pontic core) (716.6±72.1 N, 1125.8±278.2 N, respectively). However, Type-19II design exhibited fewer delamination failures. Both framework design and dynamic fatigue were found to have a significant influence (p<0.05) on the load-bearing capacity of FRC-FPDs.Additionally, the in-vitro fatigue and wear behaviours of FRC crowns, fabricated conventionally from bidirectional FRC and indirect PRC (Sinfony), were compared with those made of two CAD/CAM alternatives, namely Lava Zirconia (LZ) and Lava Ultimate (LU). A chewing simulator was employed to induce some fatigue wear in crowns, while an…
Subjects/Keywords Fibre-reinforced composite; Oral scanner; Tooth wear; microhardness; edge strength; Shear bond strength; fatigue; load bearing capacity; crown; Fixed partial denture; CAD/CAM; digital dentistry
Contributors SATTERTHWAITE, JULIAN JD; Silikas, Nikolaos; Satterthwaite, Julian
Language en
Country of Publication uk
Format 261 page(s)
Record ID oai:escholar.manchester.ac.uk:uk-ac-man-scw-283118
Repository manchester
Date Retrieved
Date Indexed 2020-09-08

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…128 Figure 3.16: Snapshot of Geomagic Control software during wear analysis. .............. 130 Figure 3.17: Wear analysis of a representative specimen relying on superimposition of three successive digital scans, A) 3D comparison performed, B…

…CEJ Cementoenamel junction DC Degree of conversion ET Total energy FEA Finite element analysis FF Final fracture FMax Maximum force FPD Fixed partial denture FRC Fibre-reinforced composite FRC-S Fibre-reinforced composite & Sinfony gF…

…mechanical properties; providing that the fibres are precisely oriented, carefully incorporated and well-bonded with the material [6, 7, 46]. This concept has been examined with a number of polymeric dental materials, such as denture base PMMA, and…

…applications were restricted to denture bases due to the problems in aesthetics and handling [45, 75, 83]. With the recent advancement in manufacturing and polymerization methods, dental applications of FRC have been significantly expanded. Numerous…

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