Susanne S Scherrer1, Ulrich Lohbauer2, Alvaro Della Bona3, Alessandro Vichi4, Michael J Tholey5, J Robert Kelly6, Richard van Noort7, Paulo Francisco Cesar8. 1. Division of Fixed Prosthodontics and Biomaterials, University Clinic of Dental Medicine, University of Geneva, Geneva, Switzerland. Electronic address: susanne.scherrer@unige.ch. 2. Research Laboratory for Dental Biomaterials, Dental Clinic 1, University of Erlangen-Nuernberg, Erlangen, Germany. Electronic address: ulrich.lohbauer@fau.de. 3. Post-Graduate Program in Dentistry, Dental School, University of Passo Fundo, Campus I, BR 285, 99052-900, Passo Fundo, RS, Brazil. Electronic address: dbona@upf.br. 4. Department of Medical Biotechnologies, University of Siena, Siena, Italy. Electronic address: alessandrovichi1@gmail.com. 5. Research and Development Department VITA Zahnfabrik, Bad Saeckingen, Germany. Electronic address: m.tholey@vita-zahnfabrik.com. 6. Department of Reconstructive Dentistry and Center for Biomaterials, University of Connecticut Health Center, Farmington, USA. Electronic address: kelly@uchc.edu. 7. School of Clinical Dentistry, University of Sheffield, Sheffield, UK. Electronic address: r.vannoort@sheffield.ac.uk. 8. Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, Brazil. Electronic address: paulofc@usp.br.
Abstract
OBJECTIVES: To provide background information and guidance as to how to use fractography accurately, a powerful tool for failure analysis of dental ceramic structures. METHODS: An extended palette of qualitative and quantitative fractography is provided, both for in vivo and in vitro fracture surface analyses. As visual support, this guidance document will provide micrographs of typical critical ceramic processing flaws, differentiating between pre- versus post sintering cracks, grinding damage related failures and occlusal contact wear origins and of failures due to surface degradation. RESULTS: The documentation emphasizes good labeling of crack features, precise indication of the direction of crack propagation (dcp), identification of the fracture origin, the use of fractographic photomontage of critical flaws or flaw labeling on strength data graphics. A compilation of recommendations for specific applications of fractography in Dentistry is also provided. SIGNIFICANCE: This guidance document will contribute to a more accurate use of fractography and help researchers to better identify, describe and understand the causes of failure, for both clinical and laboratory-scale situations. If adequately performed at a large scale, fractography will assist in optimizing the methods of processing and designing of restorative materials and components. Clinical failures may be better understood and consequently reduced by sending out the correct message regarding the fracture origin in clinical trials.
OBJECTIVES: To provide background information and guidance as to how to use fractography accurately, a powerful tool for failure analysis of dental ceramic structures. METHODS: An extended palette of qualitative and quantitative fractography is provided, both for in vivo and in vitro fracture surface analyses. As visual support, this guidance document will provide micrographs of typical critical ceramic processing flaws, differentiating between pre- versus post sintering cracks, grinding damage related failures and occlusal contact wear origins and of failures due to surface degradation. RESULTS: The documentation emphasizes good labeling of crack features, precise indication of the direction of crack propagation (dcp), identification of the fracture origin, the use of fractographic photomontage of critical flaws or flaw labeling on strength data graphics. A compilation of recommendations for specific applications of fractography in Dentistry is also provided. SIGNIFICANCE: This guidance document will contribute to a more accurate use of fractography and help researchers to better identify, describe and understand the causes of failure, for both clinical and laboratory-scale situations. If adequately performed at a large scale, fractography will assist in optimizing the methods of processing and designing of restorative materials and components. Clinical failures may be better understood and consequently reduced by sending out the correct message regarding the fracture origin in clinical trials.
Authors: Taciana Emília Leite Vila-Nova; Isabelle Helena Gurgel de Carvalho; Dayanne Monielle Duarte Moura; André Ulisses Dantas Batista; Yu Zhang; Carlos Alberto Paskocimas; Marco Antonio Bottino; Rodrigo Othávio de Assunção E Souza Journal: Dent Mater Date: 2020-01-31 Impact factor: 5.304
Authors: Katia R Weber; Daniel E Meneghetti; Paula Benetti; Alvaro Della Bona; Jason A Griggs; Márcia Borba Journal: J Prosthet Dent Date: 2021-09-02 Impact factor: 3.426
Authors: João P M Tribst; Amanda M O Dal Piva; Alexandre L S Borges; Lilian C Anami; Cornelis J Kleverlaan; Marco A Bottino Journal: Materials (Basel) Date: 2020-04-16 Impact factor: 3.623