Research Topics
| B R LawnSummaryAffiliation: National Institute of Standards and Technology Country: USA Publications
| Collaborators
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Detail Information
Publications
Materials design in the performance of all-ceramic crownsBrian R Lawn
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Building 301, Shipping and Receiving, Gaithersburg, MD 20899 8500, USA
Biomaterials 25:2885-92. 2004..Critical loads depend strongly (quadratically) on crown net thickness. The analytic relations provide a sound basis for the materials design of next-generation dental crowns...- Use of contact testing in the characterization and design of all-ceramic crownlike layer structures: a reviewB R Lawn
National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
J Prosthet Dent 86:495-510. 2001..Such an approach may be used to establish a scientific, materials-based foundation for designing next-generation crown layer structures... 
Predicting failure in mammalian enamelBrian R Lawn
Ceramics Division, National Institute of Standards and Technology, Gaithersburg, USA
J Mech Behav Biomed Mater 2:33-42. 2009..Implications in dentistry and evolutionary biology are discussed...- Materials design of ceramic-based layer structures for crownsB R Lawn
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899 8500, USA
J Dent Res 81:433-8. 2002..The study provides simple a priori predictions of failure in prospective ceramic/substrate bilayers and ranks ceramic materials for best clinical performance... - Analysis of fracture and deformation modes in teeth subjected to occlusal loadingBrian R Lawn
National Institute of Standards and Technology, Gaithersburg, MD 20899 8520, USA
Acta Biomater 5:2213-21. 2009..This accounts for the remarkable damage tolerance of natural teeth. The equations may enable basic predictions of tooth responses for humans and animals under a variety of specified dietary and functional conditions... - Veneer vs. core failure in adhesively bonded all-ceramic crown layersJ J W Lee
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Mail Stop 8520, Gaithersburg, MD 20899 8520, USA
J Dent Res 87:363-6. 2008..Veneer cracking did depend on adhesive thickness. However, no significant differences in critical loads for veneer cracking were observed for specimens containing alumina or zirconia cores... - Role of microstructure on contact damage and strength degradation of micaceous glass-ceramicsI M Peterson
Materials Science and Engineering Laboratory, National Institue of Standards and Technology, Gaithersburg, Maryland, USA
Dent Mater 14:80-9. 1998..A series of micaceous glass-ceramics crystallized from a common glass composition, using heat treatments to increase the diameter and aspect ratio of mica platelets, is used as a model ceramic system... - Fracture modes in human teethJ J W Lee
Ceramics Division, National Institute of Standards and Technology, Gaithersburg, MD 20899 8520, USA
J Dent Res 88:224-8. 2009..At higher loads, additional crack modes--such as enamel chipping and delamination--began to manifest themselves, leading to more comprehensive failure of the tooth structure... - Damage modes in dental layer structuresY G Jung
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
J Dent Res 78:887-97. 1999..Finite element modeling is used to evaluate the tensile stresses responsible for the different crack types. The clinical relevance of these observations is considered... - Deep-penetrating conical cracks in brittle layers from hydraulic cyclic contactYu Zhang
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
J Biomed Mater Res B Appl Biomater 73:186-93. 2005..This new type of cone cracking may limit dental crown veneer lifetimes under occlusal fatigue conditions, especially in thicker layers, where competing modes-such as undersurface radial cracks-are suppressed... - Fatigue and damage tolerance of Y-TZP ceramics in layered biomechanical systemsYu Zhang
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
J Biomed Mater Res B Appl Biomater 71:166-71. 2004.... - Role of substrate material in failure of crown-like layer structuresJae Won Kim
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 8500, USA
J Biomed Mater Res B Appl Biomater 81:305-11. 2007..Finite element analysis is used to determine stress distributions pertinent to the observed fracture modes. It is suggested that stiffer substrate materials offer potential for improved crown lifetime in dental practice... - Properties of tooth enamel in great apesJames J W Lee
Ceramics Division, National Institute of Standards and Technology, Gaithersburg, MD, USA
Acta Biomater 6:4560-5. 2010..The results suggest that differences in load-bearing capacity of molar teeth in primates are less a function of underlying material properties than of morphology... - Effect of sandblasting on the long-term performance of dental ceramicsYu Zhang
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8500, USA
J Biomed Mater Res B Appl Biomater 71:381-6. 2004..However, the shift is considerably greater in the cyclic data, suggesting some mechanically assisted growth of the sandblast flaws. These results have implications in the context of lifetimes of dental crowns... - Transverse fracture of brittle bilayers: relevance to failure of all-ceramic dental crownsJae-Won Kim
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8500, USA
J Biomed Mater Res B Appl Biomater 79:58-65. 2006..These latter cracks, because of their lack of containment within the core layer, are regarded as especially dangerous. Implications concerning the design of optimal dental crowns in relation to materials optimization are considered... - Characterization of damage modes in dental ceramic bilayer structuresYan Deng
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
J Biomed Mater Res 63:137-45. 2002..The utility of such analyses in the design of ceramic/substrate bilayer systems for optimal resistance to lifetime-threatening damage is discussed... - Role of core support material in veneer failure of brittle layer structuresIlja Hermann
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 8500, USA
J Biomed Mater Res B Appl Biomater 82:115-21. 2007..Consideration is also given to the roles of interface strength and residual thermal expansion mismatch stresses in relation to the different joining methods... - Role of indenter material and size in veneer failure of brittle layer structuresSanjit Bhowmick
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 8500, USA
J Biomed Mater Res B Appl Biomater 82:253-9. 2007..Clinical implications of the results are considered, including the issue of single-cycle overload versus low-load cyclic fatigue and changes in fracture mode with loading conditions... - Fracture of ceramic/ceramic/polymer trilayers for biomechanical applicationsYan Deng
Department of Materials and Nuclear Engineering, University of Maryland, College Park, Maryland 20742-2115, USA
J Biomed Mater Res A 67:828-33. 2003..Relevance of the analysis to dental crowns and other biomechanical applications is a central theme of the study... - Margin failures in crown-like brittle structures: off-axis loadingChris Ford
School of Mechanical Engineering, The University of Western Australia, Crawley, Western Australia 6009, Australia
J Biomed Mater Res B Appl Biomater 85:23-8. 2008..Finite element modeling is used to show that off-axis loading dramatically increases the tensile stresses at the near-side dome margin, strongly diminishing the loads required to generate the lunar fracture mode... - Damage accumulation and fatigue life of particle-abraded ceramicsYu Zhang
Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, New York 10010, USA
Int J Prosthodont 19:442-8. 2006..In fatigue, small flaws introduced by particle abrasion can outweigh any countervailing strengthening effect from compression associated with surface damage or, in the case of zirconia, with phase transformation... - Contact damage in brittle coating layers: influence of surface curvatureTarek Qasim
School of Mechanical Engineering, The University of Western Australia, Crawley, W.A. 6009, Australia
J Biomed Mater Res B Appl Biomater 73:179-85. 2005..Implications concerning the design of ceramic-based dental crowns are considered... - Margin failures in brittle dome structures: relevance to failure of dental crownsTarek Qasim
School of Mechanical Engineering, The University of Western Australia, Crawley, Western Australia 6009, Australia
J Biomed Mater Res B Appl Biomater 80:78-85. 2007..Finite element analysis is used to determine the basic stress states within the dome structures, and to confirm a shift in maximum tensile stress from the near-contact area to the dome sides with more compliant indenters... - Effect of off-axis concentrated loading on failure of curved brittle layer structuresTarek Qasim
School of Mechanical Engineering, The University of Western Australia, Crawley, W.A. 6009, Australia
J Biomed Mater Res B Appl Biomater 76:334-9. 2006..Finite element calculations are used to evaluate stress states in the specimens for correlation with the experimental data... - Fatigue sensitivity of Y-TZP to microscale sharp-contact flawsYu Zhang
New York University College of Dentistry, 345 East 24th Street, New York, New York 10010, USA
J Biomed Mater Res B Appl Biomater 72:388-92. 2005..1 N to 1 N, attesting to the highly deleterious nature of sharp particulate contacts. The mechanism of fatigue is considered in terms of microcrack evolution within the indentation damage zone...