Michael V. Swain

University of Sydney

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Qing Li

University of Sydney

Jules Kieser

University of Otago

John Neil Waddell

Boehringer Ingelheim (United States)

J. S. Williams

Australian National University

Junning Chen

University of Exeter

J. E. Bradby

Australian National University

Zhongpu Zhang

Western Sydney University

Paul Munroe

Materials Science & Engineering

R. H. J. Hannink

CSIRO Manufacturing

Gerold A. Schneider

Hamburg University of Technology

Cooperative Institutions

University of Sydney

229

University of Otago

105

University of Technology Sydney

UNSW Sydney

Centre National de la Recherche Scientifique

Commonwealth Scientific and Industrial Research Organisation

American Ceramic Society

Sydney Dental Hospital

Sun Yat-sen University

University of Alabama in Huntsville

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Preliminary in vitro Assessment of Erosive Potential Using the Ultra-Micro-Indentation System

Caries Research (2003)

Erin K Mahoney James H. Beattie Michael V. Swain N. Kilpatrick

The aim of this study was to measure the change in hardness and modulus of elasticity of enamel and dentine in primary teeth using the ultra-micro-indentation system (UMIS) after exposure to potentially erosive beverages and to relate the changes to the chemical composition of the test beverages. Primary molar teeth were sectioned and polished. Indentations were made in enamel and dentine prior to and then after exposure to one of four beverages: distilled water (control), orange juice, Orange Cordial, Fanta((R)) and a 'toothfriendly' Tropical Orange Cordial (Ribena((R))). Each beverage was then analysed. Fanta and Orange Cordial were the only test beverages to show a statistically significant reduction in the enamel hardness in comparison to the control and only Fanta showed a significant reduction in dentine hardness. None of the test beverages significantly reduced the modulus of elasticity of either enamel or dentine. Statistically the pH, phosphate and fluoride concentrations of the beverages were correlated with softening of enamel. Calcium concentration and titratable acidity were correlated with softening of dentine. The UMIS offers another method of measuring the basic mechanical properties of enamel and dentine. This is useful in predicting the erosive potential of substrates. It is likely that the pH, titratable acidity, fluoride, phosphate and calcium content of beverages are all important in determining the potential erosiveness of beverages.

Titratable acid

Knoop hardness test

Orange juice

Distilled water

10.1159/000070448

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Citations (63)

One-step approach for hydroxyapatite-incorporated TiO2 coating on titanium via a combined technique of micro-arc oxidation and electrophoretic deposition

Applied Surface Science (2011)

Yu Bai Il Song Park Sook Joung Lee Tae‐Sung Bae Warwick Duncan

Electrophoretic Deposition

Simulated body fluid

Energy-dispersive X-ray spectroscopy

10.1016/j.apsusc.2011.03.058

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Citations (53)

Fracture behavior of micro-sized specimens with fatigue pre-crack from a Ni-P amorphous alloy thin film; Mechanical Properties of Structural Films

Kazuki Takashima M. Shimojo Y. Higo Michael V. Swain

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Domain rearrangement during nanoindentation in single-crystalline barium titanate measured by atomic force microscopy and piezoresponse force microscopy

Applied Physics Letters (2005)

Gerold A. Schneider T. Scholz J. Muñoz‐Saldaña Michael V. Swain

Nanoindentation tests in an aa-in-plane domain area of an {001} oriented barium titanate single crystal were performed using a conical indenter with a tip radius of 800 nm. The topography and the polarization vectors of the area after indentation were imaged afterwards by both atomic force and piezoresponse force microscopy (PFM), respectively. Two perpendicular oriented cracks in the {110} planes were identified in the topographic image. An unexpected considerable uplift occurs inside the residual impression, which was correlated with a sharp pop-out-like behavior observed in the force-displacement curve just prior to unloading. Furthermore, PFM revealed an almost a twofold symmetric arrangement of the domains around the indent, which can be explained by residual circumferential tensile stresses around a residual impression and was unambiguously correlated to the crystal orientation.

Piezoresponse force microscopy

Indentation

Barium titanate

10.1063/1.1920410

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Citations (49)

Influence of vertical misfit of titanium and zirconia frameworks on peri-implant strain.

PubMed (2012)

Jaafar Abduo Michael V. Swain

To assess the influence of misfit of implant titanium and zirconia frameworks on peri-implant strains.Two Branemark implants were inserted in the areas of the mandibular left second premolar and second molar of an artificial epoxy resin mandible. From this model, five titanium and five zirconia frameworks of similar design were fabricated by means of computer numeric controlled milling. Strain gauges were mounted around each implant to assess strain development as a result of framework fit/misfit. In addition, the vertical gap at the framework-implant interface was measured using an optical microscope when only one screw was tightened (one-screw test) and when both screws were tightened (two-screw test). The vertical fit of the frameworks was altered by introducing one to three nominally 30-Μm steel shims on one of the implants. The data were analyzed statistically using one-way analysis of variance and the Mann-Whitney test.For each condition, a measurable amount of strain was recorded. As more vertical misfit was introduced, a linear increase in peri-implant strains was observed. The two framework materials generated similar amounts of strain. A direct relationship was observed between strain and the vertical gap.The magnitude of peri-implant strain is primarily affected by the fit of the framework rather than the material. Titanium and zirconia frameworks showed a similar outcome in relation to fit and strain development.

Premolar

Strain gauge

Strain (injury)

Source

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Citations (27)

Table of Contents

Journal of Prosthetic Dentistry (2014)

Mamta Mehra Farhad Vahidi Brian Lesage Zafer Özgür Pektaş Beyza Hancıoğlu Kırcelli

Table (database)

10.1016/s0022-3913(14)00276-5

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Citations (0)

The influence of flame and furnace soldering method on the stress corrosion, fatigue resistance and fracture toughness of soldered bar attachment systems for implant overdentures

Journal of the Royal Society of New Zealand (2019)

John Neil Waddell Insa Deckhart Melanie Welge Ionut Ichim Michael V. Swain

The purpose of the study was to investigate the influence of flame and furnace soldering methods on the stress corrosion, fatigue resistance and fracture toughness of a ‘Dolder’ bar soldered to a non-oxidising gold cylinder using a gold solder. Two bars were soldered to opposite sides of a cylinder using the two techniques. Fatigue cycling one side of the bars was undertaken, with one group in a wet corrosive environment and the other in air. Force displacement load-unload curves was established to 100 N as a base line, thereafter, every 1000 cycles to 100 N load for 10,000 cycles. The system compliance and energy loss (mJ), was calculated. The critical stress intensity factor, K1c, of the solder/cylinder interface was established using a single-edge-notched-beam test. Mode of failure was evaluated using SEM. No corrosion was observed in the wet environment. Both soldering methods produced a thin brittle diffusion layer within the surface of the cylinder. The K1c of this layer was similar to that of a brittle ceramic. No embrittling reaction occurred at the solder/bar junction. This interfacial reaction has clinical relevance for soldered bar attachment systems using non-oxidising cylinders.

Brittleness

Bar (unit)

10.1080/03036758.2019.1681478

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Citations (1)

Mechanical Properties and reliability of Copper thin films. Some aspects related to stress voiding and interconnections

HAL (Le Centre pour la Communication Scientifique Directe) (2006)

Maria Ignat Michael V. Swain M. Grégoire

Source

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Investigation of the stresses and stress intensity factors responsible for fracture of thin protective films during ultra-micro indentation tests with spherical indenters

Thin Solid Films (1996)

E.R. Weppelmann Michael V. Swain

Indentation

10.1016/s0040-6090(95)08525-4

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Citations (110)

A Study of Dislocation Arrays at Spherical Indentations in LiF as a Function of Indentation Stress and Strain

physica status solidi (b) (1969)

Michael V. Swain Brian R. Lawn

Abstract A systematic study has been made of the dislocation arrays produced by indenting (001) surfaces of LiF with steel and nylon spheres. The arrays are discussed in terms of position along a curve relating “indentation stress” to “indentation strain”, these parameters being determined by the geometry of the contact between indenter and specimen. Three stages of behaviour are distinguished: (i) elastic stage, to which the classical Hertzian contact theory is applicable; (ii) initial yield stage, to which standard yield criteria may be applied to predict the spatial location and critical resolved shear stress for initiation of dislocation motion; (iii) subsequent growth of plastic zone, in which the relative activity of the various slip systems determine the indentation behaviour. A mechanism for the initiation of dislocation flow below an indenting sphere has been proposed on theoretical grounds, and subsequently supported by experimental evidence; this mechanism differs from alternative proposals in that the dislocation sources operate within the interior of the crystal rather than at the crystal surface. An evaluation of the dislocation activation stress for LiF is thereby made, the value obtained being in reasonable agreement with results taken from conventional compression tests. The indentation stress‐strain behaviour is then discussed in the light of current thought on indentation theory, and some shortcomings in present ideas are pointed out.

Indentation

Flow stress

Peierls stress

Contact Mechanics

10.1002/pssb.19690350242

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Citations (96)