Tensile secondary creep rate analysis of a dental veneering porcelain

Lunt, Alexander J.G.; Kabra, Saurabh; Kelleher, Joe; Zhang, Shu Yan; Neo, Tee K.; Korsunsky, Alexander M.

doi:10.1016/j.tsf.2015.05.039

Cited by 6 publications

(10 citation statements)

References 36 publications

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“…The next stage of veneer fabrication involves the application of another layer of slurry and reheating the system to 750℃ in order to sinter the new material [88]. This temperature is insufficient to melt the proceeding layer of porcelain, but has been shown to be sufficient to induce creep at tensile stresses greater than 100 MPa [83,84]. Tensile creep is activated within the porcelain in the first 50 μm from the interface.…”

Section: Mechanistic Interpretation Of the Resultsmentioning

confidence: 99%

“…Nanovoiding of this type and size have recently been shown to be induced by high temperature tensile creep at temperatures and stresses similar to those present at the YPSZ-porcelain interface during manufacture [83,84]. Although no nanoscale structural evidence for creep was identified at distances > 1.5 μm from the interface, the larger distances over which tensile residual stresses are observed (50 − 100 μm) indicate that creep may also occur within this region (Figure 6a).…”

Section: Compendium Of Mechanical Microscopy Of the Ypsz-porcelain Inmentioning

confidence: 90%

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Investigations into the interface failure of yttria partially stabilised zirconia - porcelain dental prostheses through microscale residual stress and phase quantification

et al. 2019

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Highlights  Residual stress and phase analysis at the microscale at interface and coping edge  X-ray diffraction and Raman spectroscopy show comparable results  Cross validation using ring-core focused ion beam and digital image correlation  Monoclinic and highly stressed regions identified close to interface  Phase transformation volumetric expansion is the origin of porcelain failure

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Section: Mechanistic Interpretation Of the Resultsmentioning

confidence: 99%

Section: Compendium Of Mechanical Microscopy Of the Ypsz-porcelain Inmentioning

confidence: 90%

Investigations into the interface failure of yttria partially stabilised zirconia - porcelain dental prostheses through microscale residual stress and phase quantification

et al. 2019

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“…Another important consideration in this manufacturing process is the impact of repeated exposure to sintering temperatures of the underlying veneer layers. It can be seen that the layers nearest the YPSZ are exposed to larger number of thermal cycles, which may facilitate relaxation of the stress state within the veneer through porcelain creep [4,59]. Porcelain creep induced nanovoiding has recently been characterised and observed at the YPSZ-porcelain interface for the first time, providing further evidence for this behaviour [60] and would result in lower magnitude, smoother strain variation similar to that identified between 0.2 and 0.4 mm from the interface.…”

Section: Discussionmentioning

confidence: 99%

Residual strain mapping through pair distribution function analysis of the porcelain veneer within a yttria partially stabilised zirconia dental prosthesis

et al. 2019

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Objectives: Residually strained porcelain is influential in the early onset of failure in Yttria Partially Stabilised Zirconia (YPSZ)porcelain dental prosthesis. In order to improve current understanding it is necessary to increase the spatial resolution of residual strain analysis in these veneers. Methods: Few techniques exist which can resolve residual stress in amorphous materials at the microscale resolution required. For this reason, recent developments in Pair Distribution Function (PDF) analysis of X-ray diffraction data of dental porcelain have been exploited. This approach has facilitated high-resolution (70 µm) quantification of residual strain in a YPSZ-porcelain dental prosthesis. In order to cross-validate this technique, the sequential ring-core focused ion beam and digital image correlation approach was implemented at a step size of 50 µm. This semidestructive technique exploits microscale strain relief to provide quantitative estimates of the near-surface residual strain. Results: The two techniques were found to show highly comparable results. The residual strain within the veneer was found to be primarily tensile, with the highest magnitude stresses located at the YPSZ-porcelain interface where failure is known to originate. Oscillatory tensile and compressive stresses were also found in a direction parallel to the interface, likely to be induced by the multiple layering used during fabrication.

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“…However, this approach leads to the primary failure mode of YPSZ prostheses: near interface chipping of the porcelain veneer [4]. The origins of this failure are poorly understood but are believed to be linked to the mechanical property variation, residual stresses and porcelain creep induced in the near-interface region during prostheses manufacture [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Microscale resolution fracture toughness profiling at the zirconia-porcelain interface in dental prostheses

et al. 2015

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The high failure rate of the Yttria Partially Stabilized Zirconia (YPSZ)-porcelain interface in dental prostheses is influenced by the micro-scale mechanical property variation in this region. To improve the understanding of this behavior, micro-scale fracture toughness profiling by nanoindentation micropillar splitting is reported for the first time. Sixty 5 μm diameter micropillars were machined within the first 100 μm of the interface. Berkovich nanoindentation provided estimates of the bulk fracture toughness of YPSZ and porcelain that matched the literature values closely. However, the large included tip angle prevented precise alignment of indenter with the pillar center. Cube corner indentation was performed on the remainder of the pillars and calibration between nanoindentation using different tip shapes was used to determine the associated conversion factors. YPSZ micropillars failed by gradual crack propagation and bulk values persisted to within 15 μm from the interface, beyond which scatter increased and a 10% increase in fracture toughness was observed that may be associated with grain size variation at this location. Micropillars straddling the interface displayed preferential fracture within porcelain parallel to the interface at a location where nano-voiding has previously been observed and reported. Pure porcelain micropillars exhibited highly brittle failure and a large reduction of fracture toughness (by up to ~90%) within the first 50 μm of the interface. These new insights constitute a major advance in understanding the structure-property relationship of this important bi-material interface at the micro-scale, and will improve micromechanical modelling needed to optimize current manufacturing routes and reduce failure.

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Tensile secondary creep rate analysis of a dental veneering porcelain

Cited by 6 publications

References 36 publications

Investigations into the interface failure of yttria partially stabilised zirconia - porcelain dental prostheses through microscale residual stress and phase quantification

Investigations into the interface failure of yttria partially stabilised zirconia - porcelain dental prostheses through microscale residual stress and phase quantification

Residual strain mapping through pair distribution function analysis of the porcelain veneer within a yttria partially stabilised zirconia dental prosthesis

Microscale resolution fracture toughness profiling at the zirconia-porcelain interface in dental prostheses

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