Attachments - Mistakes, Errors And Solutions | OrthoDontics In Interview | Linton Nash 

"When we place attachments, we assume they are accurate,  but small errors in volume, location, plaque, or insertion can completely change the force system."

"Sometimes the attachment itself can make movement worse than having no attachment at all."

"I'm not trying to eliminate every error,  I'm trying to control every error we can control."

I'm joined by Dr. Linton Nash from Australia for a deep dive into aligner attachments andtrim line design, factors often overlooked but significant in tooth movement.

We explore Linton’s attachment term ‘VALE’ , volume, abrasion, location, and errors, and discuss how seemingly small factors such as plaque, attachment positioning, and tray design may significantly alter force delivery and treatment outcomes.

We discuss attachment design, optimised versus conventional designs, why they can underperform clinically, and the advantage a force system  from straight trim lines can achieve. The biomechanics of lingual attachments but the inaccuracy in their use, and whether aligner systems are fundamentally working with unavoidable “play” similar to fixed appliances.

Linton also shares his research into 3D printed attachments, attachment accuracy protocols, refinement strategies, and the future of aligner mechanics.

🕒 Timestamps of Key Questions & Answers

03:12 What Does VALE Mean in Attachment Errors?

08:40 Which Attachment Errors Have the Biggest Clinical Impact?

15:03 Are We Destined to Work With Errors in Aligners?

18:51 Is There “Play / Slop” Between Aligners and Teeth Like Fixed Appliances?

21:43 Do  Optimized Attachments Work Predictably?

28:14 Should Straight Trim Lines Be the Default?

33:54 Why Don’t More Companies Offer Trim Line Variations?35:34 Are Negative Attachments & Power Ridges Effective?38:18 How Accurate Are 3D Printed Attachments?

44:38 Should We Use Lingual Attachments?

47:36 Can Pre-scan Attachments Be The Solution (Universal Attachments by Keejoon)?

50:20 One Piece of Advice for Orthodontists

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