Come and join Prof Theodore Eliades, the EOS 2024 Distinguished Teacher, in an interactive webinar lecture for postgraduate students, titled: 

"Lessons not learnt from the introduction of new materials in Orthodontics: the case of aligners and 3D printing"

This online lecture is intended for students only. EOS Postgraduate Members can register for free. Students who are not currently members of EOS are entitled to one free year of Postgraduate Membership by registering for this lecture.

The lecture will consider the following: 

1) Pattern of new materials and devices introduction in clinical practices 

2) Efficiency of aligners beyond the empirically reported outcomes and case show analysis 

3) 3D-printing of metals and polymers and the actual contribution to patient benefit and therapeutic outcome weighing the risks arising from their use 

The webinar represents 3 hours of verifiable Continuing Professional Development (3 CPD points).


Friday 23 February 2024, 15:00-17:30 CET. 

Recording available until 6 March on demand.

15:00 CET
Opening remarks

15:05 CET
Part 1 - Introduction of materials and devices in Orthodontics: we never learn

15:30 CET
Part 2 - Aligners: what’s missing

16:05 CET
15 minute break

16:20 CET
Part 3 - 3D-printing: fancy but so what?

16:45 CET
Part 4 - Decontaminating the evidence

17:10 CET
Questions and Answers

Speaker Bio

Theodore Eliades is Professor and Director of the Clinic of Orthodontics and Pediatric Dentistry, Center for Dental Medicine, University of Zurich, Switzerland. He graduated from the University of Athens, Greece, completed his Orthodontic residency at the Ohio State University, and earned a Master of Science from Ohio State, a Dr Med Sci from the University of Athens, a PhD from the University of Manchester and a DSc from the same Institution. He has published over 300 papers, 60 chapters, and 14 books, which received 17,500 citations (h index 72-scholar). He is a Fellow of the Royal Society of Chemistry and the Institute of Physics, the Institute of Materials Minerals and Mining, and the Royal College of Surgeons (Ed). His past affiliations include a tenured Assoc. Prof. position at the Aristotle University of Thessaloniki, Greece, visiting professorships at the King’s College London and the University of Adelaide, an adjunct professorship at Boston University, and research posts at the Universities of Manchester, Texas-Houston, and Marquette. He is the Editor-in-Chief of the Korean Journal of Orthodontics, has co-supervised and/or examined 60 theses at Universities of 8 countries on 3 continents, and has lectured to more than 20 postgraduate orthodontic programs in Switzerland, Greece, Germany, France, Belgium, the Netherlands, UK, Sweden, Norway, Denmark, UAE, Australia, USA, and Spain. He was a member of the committees of the updated Erasmus guidelines of postgraduate education in orthodontics in Europe and the World Federation of Orthodontics guidelines for postgraduate orthodontic education. He founded the Orthodontic Biomaterials Network (, the first of its kind, comprised of European Universities and research centers. His area of expertise includes surface, chemical, mechanical, biological and clinical properties and treatment effects of orthodontic materials, bonding to enamel, and mechanics of materials and tissues. He has contributed the first evidence on the xeno-estrogenicity of orthodontic polymers in 2008, whereas his research in retrieval analyses of biomaterials in 2000 and a related textbook in 2005 paved the way for the emergence of the field of in vivo-ageing of dental biomaterials.

Learning Objectives

A review of the introduction of new materials in orthodontics and the lack of substantiation of their efficiency is provide

  • The efficiency as it has been reported of aligners in treating different types of malocclusions
  • Characteristics of aligner treatment (periodontal condition, salivary bacteria levels, force magnitude, intraoral ageing, elution of substances)
  • A review of the 3D-printed aligners and the evidence reported on their properties
  • Ageing pattern, hazards and risks with 3D-printing of metallic appliances·       
  • Concerns with the capacity of practicing professionals to assess the validity of evidence published in journals deviating from the mainstream model (predatory journals etc) 


The lecture discusses the introduction of new materials in the profession in the past 30 years and examines the unsubstantiated claims accompanying their marketing: the list includes superelastic NiTi wires, moisture insensitive adhesives, self-ligating brackets, self-etching adhesives, and focuses on the use of aligners to treat any type of malocclusion, and the hype of 3D-printed appliances. Evidence from the literature reports the actual efficiency, efficacy and safety of aligners and 3D-printed materials as well as the mechanisms underlying their mechanical and chemical alterations in vivo and resultant clinical implications and biological properties. The growing complexity in assessing the validity of evidence is also discussed, in the context of the increasing number of pseudo-scientific periodicals, industry-sponsored symposia, predatory journals, and continuing education seminars dominated by industry-paid speakers, whose remarkable aversion to publishing has not prevented them from lecturing around the world.


Free for EOS member students.

The registration fee for non-members is £35.00 incl. 20% VAT and includes one free year of Postgraduate Membership

Payments must be made electronically by credit/debit card. 

Read about the membership benefits here.

If you cannot make the livestream on Friday 23 February but do not want to miss it, 
you can register to access the recording until Wednesday 6 March.