Biocompatibility of orthodontic aligner materials in the digital workflow: A quantitative In Vitro comparison of thermoformed, directly printed, and polyamide-12 systems
Originally at sciencedirect.com
Summary & scoring by The Bell Brief (Dr. Jennifer Bell) using the Drill-Down Protocol (Drill-Down Score) — not the original publisher.
Why it matters for dental
Orthodontists and clear-aligner providers need to know that directly-printed aligners and polyamide-12 materials show different cytotoxicity and ion-release profiles than traditional thermoformed PET-G, which could affect patient safety, regulatory compliance, and material choice in digital workflows.
Key points
- In-vitro assays quantified residual monomers, metal ion leaching, and cell-viability differences among thermoformed, directly-printed, and PA-12 aligners.
- Direct-print resins released higher concentrations of unpolymerized monomers than thermoformed blanks; PA-12 systems released trace cobalt and nickel ions.
- Cytotoxicity rankings (MTT assay) placed thermoformed PET-G as least cytotoxic, followed by PA-12, with several direct-print resins exceeding 30 % cell death at 72 h.
- Findings apply to any practice or DSO scaling in-house printing; material selection may soon factor into informed consent, marketing claims, and potential liability.
Who should care
Read the original on Journal of Dentistry
Full reporting and any paywall content live on sciencedirect.com. We summarize and score; we do not republish.
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