Associate Professor  Abdur-Rasheed  Alao
Universiti Teknologi Brunei,  Brunei

Title: Fatigue Behaviour of State-of-the Art Dental Ceramics: An Overview

Abstract:

Fatigue is a process involving nucleation, propagation and coalescence of cracks. Its effect is highly catastrophic because the material can fail at a stress level lower than its yield strength if the applied stress is cyclic. It accounts for the highest failed engineering devices since these devices experience load fluctuations during usage. Also, human masticatory function is a cyclic loading process reportedly subjected to 1400-1500 cycles/day with loads ranging 100-800 N at a rate of 1.5 Hz. Therefore, understanding the fatigue behaviour is necessary for the long-time survival and performance of dental materials. Traditionally, metals are the favourite dental materials because of their high strength and durability but are not aesthetically pleasing. Although they are often fused with ceramics to improve their aesthetics, but other associated problems include oral galvanism, metal allergies, and ceramic fracture. Consequently, dental ceramics have been used tremendously. In this talk, a brief overview of metallic and ceramic dental materials emphasizing on lithium disilicate glass-ceramic (LDGC) and yttria tetragonal zirconia polycrystals (Y-TZP) and dental CAD/CAM is introduced. Next, an overview of the Hertzian contact fatigue which usefully simulates the intra-oral loading conditions is presented. Finally, the findings of the low-cycle-high-load cyclic Hertzian indentations conducted on LDGC/Y-TZP conditioned to different surface asperities are detailed.

The keynote speech has been uploaded on my youtube channel, please  https://www.youtube.com/watch?v=ytNQ77AJYvQ&t=28s

Biography:

Dr. Abdur-Rasheed Alao received PhD Cum Laude (highest honours) in Mechanical Engineering from James Cook University (JCU) Australia in 2016. The PhD Cum Laude is usually awarded to outstanding candidates on the basis of both the originality of the research and the quality of presentation indicating that the thesis represents approximately top 5% of PhD theses from all universities. His research interests span but not limited to additive manufacturing, bio/nano mechanics, mechanical behavior of materials, precision engineering and surface engineering. He has published widely in many peer-reviewed international journals with a combined impact factor of 54 in these research areas culminating into a Scopus H index of 10 and has been invited to deliver talks at many international conferences. Also, he has ample professional teaching and research experience cutting across different countries teaching many subjects in Mechanical/Manufacturing/Materials Engineering. Currently, he is Assistant Professor at the Universiti Teknologi Brunei, Brunei Darussalam.  Further, he is a chartered engineer elected by the Engineering Council, UK and a member of the Institution of Mechanical Engineers, UK and American Society of Mechanical Engineers, USA. In addition, he serves as referee for many international high-quality journals. Finally, he has received many research awards notably the University Medal for Excellence for a Doctoral Research Thesis, JCU Australia.