ArticleThe Angle orthodontist2026
Assessment of different direct printed aligner resins for leaching of urethane dimethacrylate: an in vivo study.
Article in The Angle orthodontist, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Authors and funding
6 authors.
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Abstract
Objectives: To evaluate the release of urethane dimethacrylate (UDMA) from the direct printed aligners using Tera Harz TC-85 resin (Graphy, Seoul, Korea) and Clear A resin (Senertek, Türkiye) in saliva samples at different time intervals. Materials and Methods: This prospective quasiexperimental study included 2 groups: Group A Tera Harz TC-85 (Graphy, Seoul, Korea) and Group B Clear A resin (Senertek, Izmir, Türkiye), each with 13 participants. Patients wore aligners for more than 20 hours a day for 14 days. Whole saliva samples were obtained at several time intervals: T0 before aligners were inserted and T1, T2, and T3 after 24 hours, 7 days, and 14 days of usage, respectively. High-performance liquid chromatography was used to analyze the samples, and the average results were computed. Results: Results showed significant variations in UDMA leaching between groups A and B at all postintervention periods. Group B had a significantly greater mean UDMA release than Group A at T1, T2, and T3. Intragroup analysis revealed time-dependent increases in UDMA release in both groups. Conclusions: The findings revealed significant differences in UDMA release rates between the two materials, with Tera Harz TC-85 consistently showing lower levels of leaching than Clear A resin over the 14-day study period. Tera Harz TC-85 has superior performance in minimizing UDMA leaching, while both materials maintained acceptable profiles under the study conditions.
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