Fracture behaviour patterns of cusp-replacing fibre strengthened composite restorations

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Abstract

OBJECTIVES: To investigate and compare, in vitro, the fracture behaviours of three types of cusp-replacing posterior composite resin restorations METHODS: Standard preparations for posterior composite restoration of the mesio-lingual cusp were cut on seventy-five extracted lower left first and second molars and restorations placed. Group A (control, n =25) with a conventional posterior composite resin, Group B (n=25): resin reinforced with nano-scale electrospun glass fibres Group C (n=25) :resin reinforced with a fibre substructure. Specimens were thermocycled for 500 cycles between 5°C and 55°C with a dwell time of 30 seconds, then embedded in plastic cylinders in acrylic resin. The specimens were loaded in a universal testing machine at a 30° angle to the long axis of the tooth until fracture occurred. Fracture patterns were highlighted by staining, studied under a microscope and classified as favourable (restorable) or unfavourable (non-restorable). Sub-classification included adhesive and cohesive failures RESULTS: Group C exhibited significantly more "restorable" fractures. Group B displayed significantly more "non-restorable" fractures. Fracture patterns differed significantly between the two fibre-strengthening techniques. (Fisher's Exact Test p = 0.05 CLINICAL SIGNIFICANCE: Resin restorations reinforced with glass-fibre substructures are more readily repaired after fracture, saving tooth structure, and reducing costs to the patient.

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Clinical challenges and the relevance of materials testing for posterior composite restorations.

D Sarrett (2004)

Posterior composite restorations have been in use for approximately 30 years. The early experiences with this treatment indicated there were more clinical challenges and higher failure rates than amalgam restorations. Since the early days of posterior composites, many improvements in materials, techniques, and instruments for placing these restorations have occurred. This paper reviews what is known regarding current clinical challenges with posterior composite restorations and reviews the primary method for collecting clinical performance data. This review categorizes the challenges as those related to the restorative materials, those related to the dentist, and those related to the patient. The clinical relevance of laboratory tests is discussed from the perspective of solving the remaining clinical challenges of current materials and of screening new materials. The clinical problems related to early composite materials are no longer serious clinical challenges. Clinical data indicate that secondary caries and restoration fracture are the most common clinical problems and merit further investigation. The effect of the dentist and patient on performance of posterior composite restorations is unclear and more clinical data from hypothesis-driven clinical trials are needed to understand these factors. Improvements in handling properties to ensure void-free placement and complete cure should be investigated to improve clinical outcomes. There is a general lack of data that correlates clinical performance with laboratory materials testing. A proposed list of materials tests that may predict performance in a variety of clinical factors is presented. Polymerization shrinkage and the problems that have been attributed to this property of composite are reviewed. There is a lack of evidence that indicates polymerization shrinkage is the primary cause of secondary caries. It is recommended that composite materials be developed with antibacterial properties as a way of reducing failures due to secondary caries. Post-operative sensitivity appears to be more related to the dentin adhesives' ability to seal open dentinal tubules rather than the effects of polymerization shrinkage on cuspal deflections and marginal adaptation.

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Physical properties and depth of cure of a new short fiber reinforced composite.

Sufyan Garoushi, Pekka K. Vallittu, Lippo Lassila … (2013)

To determine the physical properties and curing depth of a new short fiber composite intended for posterior large restorations (everX Posterior) in comparison to different commercial posterior composites (Alert, TetricEvoCeram Bulk Fill, Voco X-tra base, SDR, Venus Bulk Fill, SonicFill, Filtek Bulk Fill, Filtek Superme, and Filtek Z250). In addition, length of fiber fillers of composite XENIUS base compared to the previously introduced composite Alert has been measured. The following properties were examined according to ISO standard 4049: flexural strength, flexural modulus, fracture toughness, polymerization shrinkage and depth of cure. The mean and standard deviation were determined and all results were statistically analyzed with analysis of variance ANOVA (a=0.05). XENIUS base composite exhibited the highest fracture toughness (4.6MPam(1/2)) and flexural strength (124.3MPa) values and the lower shrinkage strain (0.17%) among the materials tested. Alert composite revealed the highest flexural modulus value (9.9GPa), which was not significantly different from XENIUS base composite (9.5GPa). Depth of cure of XENIUS base (4.6mm) was similar than those of bulk fill composites and higher than other hybrid composites. The length of fiber fillers in XENIUS base was longer (1.3-2mm) than in Alert (20-60μm). The new short fiber composite differed significantly in its physical properties compared to other materials tested. This suggests that the latter could be used in high-stress bearing areas. Copyright © 2013 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.

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Nanoparticle-reinforced resin-based dental composites.

Yang Xia, Feimin Zhang, Haifeng Xie … (2008)

TiO(2) nanoparticles treated with the organosilane allyltriethoxysilane (ATES) are used to improve the mechanical properties of dental resin-based composites (RBCs, Z100, 3M ESPE). TiO(2) nanoparticles were sonically dispersed in an ethanol solution containing ATES. The modified particles were washed in pure ethanol and dried before being used as filler. Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM) were used to analyze the nanoparticles. Five groups of composite resin specimens were prepared: one control group, and four groups using either modified or unmodified nanoparticles comprising 0.5% or 1.0% of the material by weight. The mechanical properties (microhardness and flexural strength) of all five groups of specimens were measured. After modification, the particles' FTIR spectrum shows a new absorption doublet at 1200 and 1020 cm(-1). TEM images show that the modified particles have better dispersion, and that their clusters are small enough to create a homogeneous surface on dental RBCs. Composite resin specimens including modified nano-TiO(2) have significantly better mechanical properties than the control group (P<0.05). The improvement of adding 1.0 wt.% modified nano-TiO(2) particles was better than that of 0.5 wt.%. Surface modification by the organosilane ATES influences the dispersion and linkage of TiO(2) nanoparticles within a resin matrix, and the modified particles are found to improve the microhardness and flexural strength of dental RBCs.

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Author and article information

Contributors

HJ Visser: Role: ND

PD Brandt: Role: ND

FA de Wet: Role: ND

Journal

Journal ID (publisher): sadj

Title: South African Dental Journal

Abbreviated Title: S. Afr. dent. j.

Publisher: The South African Dental Association (SADA) (Johannesburg )

ISSN: 0375-1562

Publication date (Print): October 2015

Volume: 70

Issue: 9

Pages: 390-395

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[1 ] University of Pretoria

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Publisher ID: S0011-85162015000900005

SO-VID: 995e9d37-7068-4760-88dd-d19e78937eb7

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http://creativecommons.org/licenses/by/4.0/

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SciELO South Africa

Self URI (journal page): http://www.scielo.org.za/scielo.php?script=sci_serial&pid=0011-8516&lng=en

Fracture behaviour patterns of cusp-replacing fibre strengthened composite restorations

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SciELO South Africa

Most cited references 69

Clinical challenges and the relevance of materials testing for posterior composite restorations.

Physical properties and depth of cure of a new short fiber reinforced composite.

Nanoparticle-reinforced resin-based dental composites.

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