The Hidden Biomechanics of Fixed Appliances & Aligners | Orthodontics In Interview | Madhur Upadhyay
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- “The reality is none of us use light continuous forces.”
- “Friction is awesome. Friction is great, we would be miserable if there was no friction… (with) uncontrolled movement everywhere”
- “Segmented arch mechanics are very tough to gain three-dimensional control over the tooth.”
- “The last major landmark in fixed appliance and in orthodontics was the pre-adjusted edgewise appliance.”
- “The root is not moving according to the wish of the orthodontist (with aligners)”
I’m joined by Madhur Upadhyay for a deep exploration of biomechanics, biology, and the true limits of orthodontic innovation. We examine advances in appliances, aligners, and digital workflows and why they have, as of yet, not improved speed or quality of clinical outcomes, and innovation is still governed by the same biological constraints that dictated tooth movement a century ago. However progress has been significant in workflows for both fixed and aligner therapy.
We also discuss why complex biomechanics are rarely implemented in routine practice, whether pre-adjusted appliances were the last major landmark innovation, and what aligners can, and cannot, achieve in terms of root control in terms of biomechanics. The conversation extends to artificial intelligence in diagnosis and treatment planning, asking whether automation enhances clinical care or gradually replaces critical thinking. We conclude with thoughts of micro and nano-plastics and the focus needed on this topic in orthodontics.
Timestamps of Key Questions & Answers
- 01:43 Are We Overestimating Orthodontic Innovation?
- 02:41 If Technology Has Advanced, Why Is Fixed Appliance Treatment No Quicker?
- 08:55 Why Are Aligners Still Only 50% Predictable?
- 12:23 Why Are Biomechanical Set Ups of Cantilevers Unpopular In Clinical Practice?
- 22:41 Have Bracket Prescriptions Stopped Innovation?
- 26:42 MBT vs Roth – Does Prescription Really Matter?
- 28:22 Can Aligners Truly Move Roots, Or Is It Just Tipping?
- 33:37 Is Software Innovation Just a Distraction from Aligner Material Limits?
- 36:15 AI in Orthodontics, Will It Replace Clinical Thinking?
- 43:00 What Are The Most Misunderstood Concepts in Biomechanics
- 51:07 The Micro and nano-plastic in Aligners
YouTube
https://youtu.be/5YkTLBkLxNs.
Publications by Madhur Upadhyay
Biomechanics of clear aligners: hidden truths & first principles 2022 https://doi.org/10.1016/j.ejwf.2021.11.002
Clear Aligners in Extraction-Based Orthodontic Treatment: A Systematic Review and Meta-Analysis 2026 DOI: 10.1111/ocr.70052
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