🚀 Arch Coordination And Arch Symmetry: Avoid These Critical Mistakes!

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  🚀 Arch Coordination And Arch Symmetry: Avoid These Critical Mistakes! Ever finished an aligner case only to realize the arches don't match or look unnatural? Let's clarify two key concepts: 🔹 Arch Coordination = Upper/lower arch harmony (interarch) 🔹 Arch Symmetry = Ideal U-shaped form (intraarch) Now let's break down the top mistakes—and how to fix them! ❌ Top Blunders Arch Coordination Fails: -Torque Mismatch – When upper/lower posteriors don't align, causing occlusal interference -CR Discrepancy – Arches that only fit in MIP but not centric relation Arch Symmetry Fails: -Forced "Perfect" U-Shape – Overriding natural anatomy leads to unstable results -Posterior Over-Expansion – Blowing out molars without anterior support creates "floating" buccal segments 💡 Pro Tips ( SoftSmile 's VISION™ Software solves both!) ✔ True Coordination Check – Test upper/lower arch fit in dynamic occlusion and CR ✔ Anchored Expansion – Maintain anterior contro...
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Thermoformed vs 3D Printed Aligners

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Jindal et al. 2019 presented a successfully 3D printed 0.75 mm thick clear aligner using
Dental Long Term (LT) clear resin and compared its mechanical and geometrical properties to a conventionally manufactured thermoformed Duran clear dental aligners. 

Dental Long Term (LT) clear resin and compared its mechanical and geometrical properties to a conventionally manufactured thermoformed Duran clear dental aligners. 

It was suggested that 3D printed resin-cured clear dental aligners are more suitable because
they have better geometric accuracy and mechanical resistance.


In early 2018, EnvisionTEC Inc. announced launch of E-Ortholign, a new material for the
direct 3D printing of clear thermoformed aligners .

This clear resin is marketed as biocompatible, stable, flexible and strong material for the direct 3D printing of esthetic retainers,Direct 3D printing of clear thermoformed aligners .

This clear resin is marketed as biocompatible, stable, flexible and strong material for the direct 3D printing of esthetic retainers.


To sum up
Direct 3D printing of aligners offers several advantages over conventional fabrication:




- Edges are softer and do not need trimming or smoothing
- Undercuts analysis is digitally defined
- Intra-aligner thickness is customizable, which may reduce the need of attachments that causes reducing the transparency of clear aligners.

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