Tomography of dental composites

Drummond, James L.; Carlo, Francesco De; Sun, Kexia; Bedran-Russo, Anakarina B.; Koin, P.; Kotche, Miiri; Super, Boaz J.

doi:10.1117/12.678498

Cited by 4 publications

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“…An initial attempt used 3-point bend bars (Drummond et al ., 2005) and then hourglass specimens (Drummond et al ., 2006). However, these method possessed several shortcomings; the image contrasts varied between samples due to reconstruction artifacts; there was difficulty in controlling the applied load; the load fluctuated while the sample was being examined; and occasionally the specimen splintered during testing.…”

Section: Multiaxial Compression and 3d Tomographymentioning

confidence: 99%

Degradation, Fatigue, and Failure of Resin Dental Composite Materials

2008

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The intent of this article is to review the numerous factors that affect the mechanical properties of particle or fiber filler containing, indirect dental resin composite materials. The focus will be on degradation due to aging in different media, mainly water and water and ethanol, cyclic loading, and mixed mode loading on the flexure strength and fracture toughness. Next several selected papers will be examined in detail with respect to mixed and cyclic loading and then an examination of 3D tomography using multiaxial compression specimens. The main cause of failure, for most dental resin composites, is the breakdown of the resin matrix and or the interface between the filler and the resin matrix. In clinical studies, it appears that failure in the first 5 years is a restoration issue (technique or material selection) and after that time period from secondary decay.

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Section: Multiaxial Compression and 3d Tomographymentioning

confidence: 99%

Degradation, Fatigue, and Failure of Resin Dental Composite Materials

2008

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“…In contrast to the initial study reported utilizing three‐point bend bar specimens,5 the analysis of the tomographic data using hourglass‐shaped samples was automatic6; that is, the same processing parameters were applied to all specimens. Because of improvements in sample shape and tomographic scanning and reconstruction, the process of distinguishing between solid regions and nonsolid regions by thresholding voxel intensities was automated.…”

Section: Discussionmentioning

confidence: 99%

“…Compressive loading was utilized next for tomographic imaging to allow microcracking observation under load prior to failure. Renew (Bisco, Schaumburg, IL) and Micronew (Bisco) composite materials were used for the second phase of this study 6. Specimens were hourglass‐shaped samples 3 mm high, 2 mm outer diameter, and 1 mm inner diameter.…”

Section: Introductionmentioning

confidence: 99%

Multiaxial analysis of dental composite materials

et al. 2008

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Dental composites are subjected to extreme chemical and mechanical conditions in the oral environment, contributing to the degradation and ultimate failure of the material in vivo. The objective of this study is to validate an alternative method of mechanically loading dental composite materials. Confined compression testing more closely represents the complex loading that dental restorations experience in the oral cavity. Dental composites, a nanofilled and a hybrid microfilled, were prepared as cylindrical specimens, light-cured in ring molds of 6061 aluminum, with the ends polished to ensure parallel surfaces. The samples were subjected to confined compression loading to 3, 6, 9, 12, and 15% axial strain. Upon loading, the ring constrains radial expansion of the specimen, generating confinement stresses. A strain gage placed on the outer wall of the aluminum confining ring records hoop strain. Assuming plane stress conditions, the confining stress (sigma(c)) can be calculated at the sample/ring interface. Following mechanical loading, tomographic data was generated using a high-resolution microtomography system developed at beamline 2-BM of the Advanced Photon Source at Argonne National Laboratory. Extraction of the crack and void surfaces present in the material bulk is numerically represented as crack edge/volume (CE/V), and calculated as a fraction of total specimen volume. Initial results indicate that as the strain level increases the CE/V increases. Analysis of the composite specimens under different mechanical loads suggests that microtomography is a useful tool for three-dimensional evaluation of dental composite fracture surfaces.

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“…Other polymeric composite systems containing cracks and studied with microCT were the elastomeric material of autotires 465 and aged dental composites. 466 Fracture of unidirectional composites is generally thought to occur when a cluster of broken fibers reaches a critical number N*, and microCT is an ideal tool for 10 Three-dimensional representations of fatigue crack in AA2024-T351, highlighting: a crack volume (in green) andb grain boundaries decorated with Ga (in gold). Specimen was imaged with 1500 views over 180u and reconstructed with 0?7 mm isotropic voxels.…”

Section: Deformation Fatigue and Fracturementioning

confidence: 99%

Recent advances in X-ray microtomography applied to materials

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2008

International Materials Reviews

443

208

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This review highlights recent advances in X-ray microcomputed tomography (microCT) as applied to materials, specifically advances made since the first materials microCT review appeared in International Materials Reviews. 1 Improvements in instrumentation are covered, and one focus is microCT using phase (as opposed to absorption) contrast. Instead of grouping studies by disciplines, the reviewed reports are organised by type of application, specifically the study of the spatial distribution of phases, of cellular solids (including static and temporally evolving structures, fibrous network solids, mineralised tissues and biomedical applications), of channel structures, of deformation, fatigue and fracture, of processing and of corrosion and environmental interactions. Metrology applications are covered briefly, and several applications where microCT is combined with position resolved X-ray scattering are described in more detail. The accuracy of microCT reconstructions is discussed before data handling challenges are outlined. The review closes with speculations on the future directions of materials microCT.

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Tomography of dental composites

Cited by 4 publications

References 0 publications

Degradation, Fatigue, and Failure of Resin Dental Composite Materials

Degradation, Fatigue, and Failure of Resin Dental Composite Materials

Multiaxial analysis of dental composite materials

Recent advances in X-ray microtomography applied to materials

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