Plenary Lecture
Finite Element Analysis of Teeth Restored with Ceramic Crowns
Associate Professor Liliana Sandu
University School of Dentistry
Specialization Dental Technology
Department of Prostheses Technology
„Victor Babeş” University of Medicine and Pharmacy Timişoara
Romania
E-Mail: lilianasandu@gmail.com
Abstract: Owing to improved material properties of ceramics, jacket crowns have become popular as esthetic restorations. However, in order to function for a long term, it is necessary to ensure that they possess high mechanical strength and that microleakage should be avoided as much as possible. Therefore, in choosing a material for the definitive restorations, it should be one where stress will not concentrate at the cervical area. Finite element analyses have been used for many investigations, because they can reproduce structures of various shapes of teeth with many elements defined with specific Young’s modulus and Poisson’s ratio values. In this manner, the distribution and magnitude of stress at any point can be precisely analyzed. The objective of the studies was to evaluate, by finite element analysis, the influence of different parameters on the stress distribution in teeth prepared for full ceramic crowns and in the restorations. The geometry of the teeth were obtained by 3D scanning using a manufactured device. The nonparametric modeling software was used to obtain the shape of the teeth structures. Different tooth preparations were designed and complete ceramic crowns were designed for all preparation types. Models were exported in Ansys finite element analysis software for structural simulations. Maximal equivalent stresses were recorded in the tooth structures and in the restoration for all preparation types. Numerical simulations provide a biomechanical explanation for stress distribution in prepared teeth and overlying crowns. Acknowledgements: This work was supported by CNCSIS-UEFISCSU, project number PN II-RU TE_217/2010.
Brief Biography of the Speaker: Dr. Liliana Sandu is Associate Professor at the University School of Dentistry, Specialization Dental Technology, Department of Prostheses Technology, „Victor Babeş” University of Medicine and Pharmacy Timişoara. She is graduated of the University School of Dentistry, University of Medicine and Pharmacy Timişoara, Romania (1998). She received the titles PhD in Dentistry (2004); primar in general dentistry (2008), specialist in orthodontics and dento-facial orthopedics (2012). Dr. Liliana Sandu participated at 84 national and international conferences, 31 training and continuous improvement courses. Her research activity is proven by 5 research projects won by competition, as project manager, 2 collaborations in other research projects. The research areas are: three dimensional reconstructions after laser scaning, CTs, three dimensional modeling, computer aided design, numerical simulations (finite element analyses) in the field of removable partial dentures (compounds of the removable partial dentures frameworks, abutment teeth): statically analyses, thermal analyses, analyses of the fatigue action, calculus of the degradation factor and life time, design optimizations), modern welding procedures of dental alloys in inert gas: laser welding, microplasma welding (experimental studies regarding welding parameter determination destructive and nondestructive analyses). The publications in the research field are: published books (13); published courses and working guides (10); published articles (140); published abstracts (160); scientific communications at conferences (194).