Can CAD/CAM resin blocks be considered as substitute for conventional resins?

Hussain, Badra; Thieu, Minh Khai Le; Johnsen, Gaute Floer; Reseland, Janne Elin; Haugen, Håvard Jostein

doi:10.1016/j.dental.2017.09.003

Cited by 52 publications

(32 citation statements)

References 26 publications

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“…Conventional composite resins, such as Z350, reveal a wear resistance lower than that of the outer layer of mild dental fluorosis; such a characteristic may lead to increased wear of the restorative materials. Composite resin block, such as LUV, is fabricated under high temperatures and high pressures and possesses mechanical properties superior to those of the conventional composite resins [ 50 ]. In the present study, composite resin block showed a wear resistance similar to that of the outer layer of the mild dental fluorosis enamel.…”

Section: Resultsmentioning

confidence: 99%

Investigation on the Gradient Nanomechanical Behavior of Dental Fluorosis Enamel

Min

et al. 2018

Nanoscale Res Lett

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This study aims to investigate the gradient nanomechanical behavior of dental fluorosis enamel and provide appropriate selection criteria for restorative materials. The nanomechanical properties of the outer, middle, and inner layers of normal tooth enamel, mild dental fluorosis enamel, and severe dental fluorosis enamel were tested by nanoindentation under an applied load of 2000 μN and holding time of 30 s. The nanotribological properties were then evaluated through nanoscratch tests under an applied load of 1000 μN. In addition, the nanotribological property of the outer layer of dental fluorosis enamel was compared with that of four restorative materials, namely, lithium disilicate glass-ceramic (IPS e.max CAD), polymer-infiltrated-ceramic network (PICN), composite resin block (Lava™ ultimate), and conventional composite resin (Fltek™ Z350XT). The nanohardness and elastic modulus of mild dental fluorosis enamel increased from the outer to the middle layers and then decreased from the middle to the inner layers. By contrast, the changed displacement, friction coefficient, and nanoscratch depth and width decreased from the outer to the middle layers and then increased from the middle to the inner layers. In severe dental fluorosis enamel, nanohardness and elastic modulus increased from the outer to the inner layers, but the changed displacement, friction coefficient, and nanoscratch depth and width decreased from the outer to the inner layers. The nanoscratch depth and width of Lava™ ultimate were similar to those of the outer layer of the mild dental fluorosis enamel. The gradient nanomechanical behavior of dental fluorosis enamel significantly differed from that of normal tooth enamel. Dental materials with a wear resistance similar to that of the opposing enamel are a good choice for restoring dental fluorosis (trial registration: WCHSIRB-D-2014-126, registered 25 December 2014).

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Section: Resultsmentioning

confidence: 99%

Investigation on the Gradient Nanomechanical Behavior of Dental Fluorosis Enamel

Min

et al. 2018

Nanoscale Res Lett

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“…A: adhesive failure at the interface between a resin cement and CAD/ CAM composite block, B: mixed failure including cohesive failure in cement and adhesive failure at the interface between resin cement and CAD/ CAM composite block, C: mixed failure including cohesive failure in CAD/CAM composite block and adhesive failure at the interface between resin cement and CAD/CAM composite block, and D: cohesive failure in CAD/CAM composite block. leading to higher degree of conversion with less residual monomer available compared with direct restoration resin composite materials 8) . This means there are much fewer free double bonds thus making it more difficult for a chemical link between resin cement and CAD/CAM block surface 22) .…”

Section: Discussionmentioning

confidence: 99%

“…In addition, resin composite materials may offer significant advantages related to their machinability and especially intra-oral reparability which is much simpler than ceramic repair 6,7) . The aforementioned factors make resin composite materials a promising option in CAD/ CAM dentistry 8) .…”

Section: Introductionmentioning

confidence: 99%

Early bond strengths of 4-META/MMA-TBB resin cements to CAD/CAM resin composite

et al. 2019

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The purpose of this study was to evaluate the early tensile bond strengths of three different resin cements; Super Bond C&B (conventional and quick type) and ResiCem to a CAD/CAM composite block. A CAD/CAM composite block (Shofu Block HC) was ground and silanized according to the manufacturers' instructions before cementation. A conventional tensile bond strength test (Ø: 4 mm) was performed 10 min, 1 h and 24 h after bonding. Super Bond C&B (quick type) showed the highest bond strength at 24 h. However, results of a three-point bend test showed the mechanical properties were weaker for the Super Bond C&B cements compared with composite cement, Resicem. The 4-META/MMA-TBB resin is a suitable resin cement to bond to a CAD/CAM composite block.

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“…The chemical and mechanical variations in these restorative materials give differing wear resistance, strength, elution of monomers, degree of curing, and indications for use 1 . It is therefore important that the properties of the materials used in restorative dentistry are thoroughly investigated, characterized, and understood 7 , 8 . Materials with less desirable functions increase the risk of secondary caries, mechanical failure, and fast material deterioration 9 .…”

Section: Introductionmentioning

confidence: 99%

Nano-CT as tool for characterization of dental resin composites

Haugen

Qasim

Matinlinna

et al. 2020

Sci Rep

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Technological advances have made it possible to examine dental resin composites using 3D nanometer resolution. This investigation aims to characterize existing dental nano-hybrid and micro-hybrid resin composites through comparing and contrasting nano-computed tomography (nano-CT) with micro-CT and high-resolution SEM images. Eight commercially available and widely used dental resin composites, 2 micro-hybrid and 6 nano-hybrid were researched. Cured samples were examined and characterized using nano-CT (resolution 450 nm) and compared with micro-CT images (resolution 2 µm). Acquired images were reconstructed and image analysis was carried out to determine porosity and pore morphology. A comprehensive comparison of scanning micrograph images unsurprisingly revealed that the nano-CT images displayed greater detail of the ultrastructure of cured dental resin composites. Filler particle diameters and its volumes were lower when measured using nano-CT, porosity being higher where analysed at higher resolution. There were large variations between the examined materials. Fewer voids were found in Tetric EvoCeram and IPS Empress Direct, the smallest pores being found in Universal XTE and Tetric EvoCeram. Nano-CT was successfully used to investigate the morphology of dental resin composites and showed that micro-CT gives a lower porosity and pore size but overestimates filler particle size. There were large discrepancies between the tested composites. Evidence of porosities and pores within a specimen is a critical finding and it might have a detrimental effect on a material’s clinical performance.

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Can CAD/CAM resin blocks be considered as substitute for conventional resins?

Cited by 52 publications

References 26 publications

Investigation on the Gradient Nanomechanical Behavior of Dental Fluorosis Enamel

Investigation on the Gradient Nanomechanical Behavior of Dental Fluorosis Enamel

Early bond strengths of 4-META/MMA-TBB resin cements to CAD/CAM resin composite

Nano-CT as tool for characterization of dental resin composites

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