Evaluation of gap width and fit in two types of thermoformed clear aligner materials | ||||
| Egyptian Orthodontic Journal | ||||
| Volume 67, Issue 1, June 2025, Page 39-50 PDF (680.55 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/eos.2024.342158.1130 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Sara S Mandour   1; Noha I Abdel Rahman 2; Marwah S Abd Ellateif 3
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| 1Orthodontic Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt | ||||
| 2Department of Orthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt. | ||||
| 3Orthodontic department, Faculty of Dentistry, Ain Shams University. | ||||
| Abstract | ||||
| Objective: To evaluate the difference in overall fit and fit percentage in two different aligner materials. Materials and methods: A series of clear aligners made of two types of orthodontic aligner thermoplastic materials, including polyethylene terephthalate glycol (PETG) films (n = 11) and thermoplastic polyurethane (TPU) films (n = 11) of 0.75 and 0.76 mm in thickness, respectively, were manufactured from the same standard tessellation language (STL) file via a positive pressure thermoforming process and trimmed to a straight 2 mm long border. The samples were sprayed with opaque spray, scanned with a desktop scanner, imported to Geomagic Control X metrology software, and superimposed on the reference STL file by the best-fit algorithm. Then root mean square (overall fit) and fit percentage were measured. Results: Root mean square values, representing the overall trueness, ranged from 0.2718 ± 0.0314 mm for Zendura FLX and 0.3162 ± 0.017 mm for Duran. Fit percentage ranged from 71.2 ± 5.4% for Zendura and 65.8 ± 3.7% for Duran. Conclusions: Multi-layered thermoplastic polyurethane (TPU) material has superior fit compared to single-layered polyethylene terephthalate glycol (PET-G) material. | ||||
| Keywords | ||||
| Accuracy of fit; thermoplastic sheets; Clear Aligner materials | ||||
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