Table 1.

Aligner material specifications, properties and commercial claims.

No	Clear Aligner Brand Name	Commercial Manufacturer	Aligner Material Composition	Aligner Material Thickness	Aligner Material Properties and Commercial Claims	Associated Software
1.	Invisalign https://www.aligntech.com/solutions	Align Technology Inc, San Jose, USA	SmartTrack™ Material: LD30 A multi-layer aromatic thermoplastic polyurethane from methylene diphenyl diisocyanate and 1,6-hexanediol plus additives	Aligner thickness stated by the manufacturer after thermoforming is 0.75 mm.	SmartTrack™ material: applies gentle, constant force to improve control of tooth movement Comfortable and fits snugly around the teeth In comparison to EX30 used previously, LD30 exhibits a more amorphous structure and a greater elastic recovery SmartForce™: customized attachments, bite ramps and power ridges SmartStage™ technology: programs sequential tooth movement to straighten teeth more predictably	ClinCheck Global cloud-based treatment visualization
2.	Clarity https://www.3m.com/3M/en_US/orthodontics-us/featured-products/clarity-eos/clear-aligners/	3 M ESPE Maplewood, USA	3 M™ Clarity™ Aligners Flex Flexible 5-layer material 3 M™ Clarity™ Aligners Force: Rigid material Proprietary 5-layer copolymer blend	Flex: 0.625 mm Force: 0.75 mm	Clarity Aligners Flex indicated a wire-sequencing approach Recommended for correction of rotation and proclination, when used in two-material Clarity Aligners Force indicated for a segmental mechanical approach Recommended for expansion, torque, sequential bodily movement, and segmental intrusion, when used in two-material treatment designs Outer layers resist staining and scratching, inner layers provide flexibility and resilience Overall structure provides durability even with reduced thickness	Tx Design (TxD) Oral Care portal
3.	Clear Correct https://www.straumann.com/clearcorrect/en/patients/about-the-aligners.html	Institut Straumann AG, Basel, Switzerland	ClearQuartz Material: Zendura Polyurethane Tri-layer proprietary material	0.75 mm	ClearQuartz material features an elastomeric layer between two resilient, low-porosity shells The outer layers allow the aligner to be tough and stain-resistant owing to its low porosity The shells also help grip the teeth firmly The inner layer is engineered to provide consistent and continual force due to its enhanced elasticity and enhances patient comfort ClearQuartz retains 10x more of its initial force than other aligners and retains its shape throughout the wear time of the aligner	Clear Pilot ClearComm portal
4.	Spark https://ormco.com/spark/	Ormco Corporation, Brea, USA	TruGEN™ and TruGEN XR Material:	0.75 mm	More sustained force retention Better surface contact area with the tooth More efficient and effective tooth movement Clearer, more comfortable and stains less	Approver
5.	SureSmile https://www.dentsplysirona.com/en-us/categories/orthodontics/suresmile-aligner.html	Dentsply Sirona, York, USA	Essix Plastics: Plus, C plus Polypropylene/ethylene copolymer (>95%), stabilizers (<5%)	Plus: 0.035 and 0.040 C plus: 0.040 inches/1 mm	Essix Plus Plastic combines clarity with durability It is effortlessly removed from models and trims with ease Essix C plus: When making retainers and aligners for bruxers, a more flexible plastic provides additional strength to help withstand mastication pressure	SureSmile Aligner
6.	Argen Clear Aligners https://argen.com-clear-aligners	Argen Corporation, San Diego, USA	Argen Clear Aligners are made from premium thermoformed plastic material consisting of elastomeric layer encased in a dual shell construction	Unspecified	Engineered for a precise fit, ongoing force retention, and exceptional durability Premium Material – a continual force for faster treatment and greater comfort for patients Improved Stain Resistance – starts clear, stays clear The consistent pressure produced by the dual-shell construction accurately moves teeth over the prescribed period of time	Unspecified
7.	Reveal https://www.henryschein.com/us-en/dental/supplies/reveal.aspx	Henry Schein, Melville, USA	Proprietary ClearWear™ material	Unspecified	Provides ultimate in aesthetics with precise force levels for speed of treatment Superior clarity compared to other aligners Guaranteed not to stain or cloud Zero to minimal unsightly attachments	DDX SLX Approver portal
8.	Nuvola https://www.nuvolaworld.com/nuvola-clear-aligners	GEO Srl Rome, Italy	Polyethylene terephthalate glycol (PET-G)	0.75 mm	Tough and elastic Resistant to the aggressive chemical agent Proof against wear and tear Precisely designed to fit firmly Easy to wear and maintain Fidelity to their original conformation Long-lasting transparency and hygiene	Unspecified
9.	F22 https://www.f22aligner.com/en/	Sweden and Martina Company, Padua, Italy	F22 Polyurethane: Evoflex:	0.75 mm	An innovative polymer that ensures up to 17% greater transparency than other aligners on the market	Unspecified