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Next-Generation Orthodontics: Functional Resins, Biomechanics, Biocompatibility, and Current Clinical Reality of Direct 3D-Printed Aligners
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Scientists reviewed new 3D-printed teeth straighteners that could replace traditional clear aligners, potentially offering better fit and even delivering antibacterial treatments or fluoride directly to teeth. However, early research shows these newer aligners may release harmful chemicals and create microplastics in the mouth. More long-term safety studies are needed before these 3D-printed aligners can be considered safe alternatives to current teeth straightening methods.
The orthodontic landscape is currently witnessing a significant technological evolution with the emergence of direct 3D-printed aligners (DPAs), which promise to close the digital workflow loop by eliminating the geometric limitations and solid model waste inherent to traditional thermoformed clear aligners (TCAs). This review provides a comprehensive analysis of the material science governing this transition from inert thermoplastic sheets to reactive photocurable resins. We explore the fundamental chemistry of DPA materials, and the pivotal role of post-processing in ensuring mechanical integrity and biocompatibility. Beyond passive mechanics, this review highlights preclinical research in functional material engineering, detailing how experimental DPAs are being investigated for the integration of antibacterial agents, remineralization fillers, and drug delivery systems. Furthermore, we evaluate the limited but emerging clinical data on DPAs, contrasting their shape-memory properties and force delivery profiles with conventional appliances, while critically addressing emerging safety concerns regarding monomer elution and microplastic generation. We conclude that while DPA technology offers superior dimensional control, comprehensive life cycle assessments and long-term in vivo trials are essential to fully substantiate their clinical efficacy, overall sustainability, and potential as advanced orthodontic appliances.
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Biocompatibility of Orthodontic Aligner Materials in the Digital Workflow: A Quantitative In Vitro Comparison of Thermoformed, Directly Printed, and Polyamide-12 Systems
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Scientists tested how different clear aligner materials—including newer 3D-printed types—affect human cells when tiny plastic particles wear off during use. Traditional thermoformed aligners and a polyamide-based system held up better in lab tests, while some 3D-printed materials showed more cell damage at higher doses and longer exposure times. This suggests that as 3D-printed aligners become more popular, manufacturers need better testing and quality controls to ensure they're safe for long-term wear in your mouth.
Microscopic Acid‐Induced Degradation and Elemental Release From Thermoformed and 3D ‐Printed Orthodontic Aligners in a Simulated Gastric Environment
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Researchers evaluated acid-induced degradation and elemental release from thermoformed and 3D-printed orthodontic aligner materials under simulated gastric conditions, finding that both types released microplastic and nanoplastic particles along with chemical additives under acidic exposure, raising concerns about ingestion risks during orthodontic treatment.
Release of Microplastics and Chemical Compounds from Clear Orthodontic Aligners: A Narrative Review of the Current Evidence
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This review summarizes existing research on clear plastic orthodontic aligners, worn in the mouth, and whether they release chemicals and tiny plastic particles as they wear down. Lab studies found that aligner surfaces can develop roughness and tiny cracks, sometimes releasing chemicals and microplastics, but most evidence comes from lab models rather than real-world use in people.
The new additive era of orthodontics: 3D-printed aligners and shape memory polymers—the latest trend—and their environmental implications
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This review examines the emerging shift toward 3D-printed clear aligners in orthodontics, highlighting how shape memory polymers could outperform traditional thermoformed aligners in clinical performance, while also raising concerns about the environmental burden of increased plastic waste from aligner production and the need for recyclable materials and clearer disposal guidelines.
Can Clear Aligners Release Microplastics That Impact the Patient’s Overall Health? A Systematic Review
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This systematic review investigates whether clear orthodontic aligners release microplastics during use in the mouth. The findings raise concerns about a previously overlooked source of direct microplastic exposure, since millions of people wear these plastic devices against their teeth and gums for months or years at a time.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.