Ceramics are widely used in dental and orthopedic applications because of their esthetic value and chemical inertness. However, ceramics are vulnerable to fracture which accounts for millions of dollars annually in replacement costs and can cause significant patient discomfort and loss of productive lifestyle. Despite improvements in material properties, the performance of all-ceramic restorations still fails to match the 'gold standard'of metal-ceramic restorations. Our previous investigations have established relations between failure modes and restoration thickness, surface conditions, ceramic properties, and loading conditions. These findings indicate that monolithic glass-ceramic and veneered-alumina restorations are vulnerable to both occlusal sliding-contact damage and cementation bulk fracture, while the veneered zirconia restorations are prone to veneer chipping and delamination. These findings are consistent with clinical reports. Recent advances in theoretical and experimental work from our current NIDCR-supported project have demonstrated that veneer failure and bulk fracture may be substantially mitigated by controlled compositional gradients within the restoration layer. Such graded structures exhibit significantly higher resistance to sliding- contact damage and flexural bulk fracture relative to their homogeneous counterparts. In this competing renewal application we propose to elucidate enhanced resistance to chipping, veneer/core delamination, and mouth-motion fatigue of graded glass-zirconia materials with and without a thin veneer (0.3 mm) in both flat model structures and anatomically-correct geometries. This will bring us closer to a solution of a clinical problem-chipping, delamination, and fracture of ceramic restorations. Additionally, we propose to establish a simple but powerful edge-indentation technique to assess the toughness properties of graded laminates, a problem area that lies beyond the scope of current fracture testing protocols. We propose to achieve these objectives through three specific aims: 1. Quantify increased resistance to edge-chipping of graded zirconia structures using a novel edge-indentation technique;2. Elucidate crack-interface interaction of graded zirconia structures using a novel crack growth technique and a conventional shear bond test;and 3. Determine resistance to fatigue damage of anatomically-correct glass/zirconia/glass graded structures with or without a thin porcelain veneer relative to commercial veneered and monolithic zirconia systems using a mouth-motion simulator in wet environments. Knowledge generated from this investigation will facilitate the development of smart glass-zirconia graded structures for next-generation dental and orthopedic prostheses with improved damage-tolerance, esthetics, and cementation properties. These improvements will lead to reduced morbidity of dental prostheses and cost of replacement to the public.

Public Health Relevance

This competing renewal proposal aims to develop glass-zirconia graded structures for next-generation all- ceramic dental restorations with improved resistance to chipping, delamination and flexural fracture, as well as improved cementation properties and esthetics. These goals will be accomplished via refinements in graded structure fabrication, novel testing methods, and materials characterization. Knowledge generated from the study will open up new avenues for applications of functionally graded materials in health care, reduce morbidity and costs of dental restoration replacements, improve public health and quality of life, and increase the potential for Public-Private Partnerships to sustain economic growth.

National Institute of Health (NIH)
National Institute of Dental & Craniofacial Research (NIDCR)
Research Project (R01)
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Study Section
Oral, Dental and Craniofacial Sciences Study Section (ODCS)
Program Officer
Drummond, James
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New York University
Schools of Dentistry/Oral Hygn
New York
United States
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Zhao, M; Sun, Y; Zhang, J et al. (2017) Novel Translucent and Strong Submicron Alumina Ceramics for Dental Restorations. J Dent Res :22034517733742
Fabris, Douglas; Souza, Júlio C M; Silva, Filipe S et al. (2017) THERMAL RESIDUAL STRESSES IN BILAYERED, TRILAYERED AND GRADED DENTAL CERAMICS. Ceram Int 43:3670-3678
Kulkarni Aranya, Anupama; Pushalkar, Smruti; Zhao, Minglei et al. (2017) Antibacterial and bioactive coatings on titanium implant surfaces. J Biomed Mater Res A 105:2218-2227
Alao, Abdur-Rasheed; Stoll, Richard; Song, Xiao-Fei et al. (2017) Fracture, roughness and phase transformation in CAD/CAM milling and subsequent surface treatments of lithium metasilicate/disilicate glass-ceramics. J Mech Behav Biomed Mater 74:251-260
Yin, Ling; Nakanishi, Yoshitaka; Alao, Abdur-Rasheed et al. (2017) A review of engineered zirconia surfaces in biomedical applications. Procedia CIRP 65:284-290
Zhang, Yu; Kelly, J Robert (2017) Dental Ceramics for Restoration and Metal Veneering. Dent Clin North Am 61:797-819
Villefort, Regina Furbino; Amaral, Marina; Pereira, Gabriel Kalil Rocha et al. (2017) Effects of two grading techniques of zirconia material on the fatigue limit of full-contour 3-unit fixed dental prostheses. Dent Mater 33:e155-e164
Kaizer, Marina R; Gierthmuehlen, Petra C; Dos Santos, Mateus Bf et al. (2017) Speed sintering translucent zirconia for chairside one-visit dental restorations: Optical, mechanical, and wear characteristics. Ceram Int 43:10999-11005
Figueiredo, Viviane Maria Gonçalves de; Pereira, Sarina Maciel Braga; Bressiani, Eduardo et al. (2017) Effects of porcelain thickness on the flexural strength and crack propagation in a bilayered zirconia system. J Appl Oral Sci 25:566-574
Cruzeiro, Mário Thadeo R; Moraes, Fernando A; Kaizer, Marina R et al. (2017) Functionalized pink Al2O3:Mn pigments applied in prosthetic dentistry. J Prosthet Dent 118:771-777

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