In vitro comparison of the mechanical properties of single and triple layered clear aligner materials. | ||||
| Ain Shams Dental Journal | ||||
| Volume 35, Issue 3, September 2024, Page 53-72 PDF (1.29 MB) | ||||
| Document Type: Original articles | ||||
| DOI: 10.21608/asdj.2024.301217.1352 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Mostafa Kamal Abdo Khairallah  1; Yasmine Alkabani 2; Wael Refai3; Kareem Maher Mohamed4
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| 1Assistant Lecturer of orthodontics, Orthodontics and Dentofacial Orthopedics Department, Faculty of Dentistry, Minia University, Egypt | ||||
| 2Restorative and dental materials department, National Research Centre, Giza, Egypt | ||||
| 3Orthodontic Department, Faculty of Dentistry, Minia University | ||||
| 4Orthodontics and Dentofacial Orthopedics Department, Faculty of Dentistry, Minia University, Egypt | ||||
| Abstract | ||||
| Aim: To compare between certain mechanical properties in TPU and PET-G aligner material in terms of tensile strength, hardness, and retention before and after simulated chewing and thermocycling. Materials and methods: For this study, two types of thermoplastic aligner sheets were used: Memoflex from Aditek orthodontics, (single layered PETG sheets, 0.75 mm thick) and Zendura FLX, (triple layered TPU sheets, 0.76 mm thick). To prepare the samples, a disc shaped model was designed using Autodesk Meshmixer 3.3, then it was 3D printed. Results: Compared to Zendura FLX aligners, Memoflex aligners had significantly larger median tensile strength, larger median retention force, larger median hardness before (p-value: <0.001) and after simulation. Conclusion: PETG seems to have better mechanical properties when compared to TPU aligners. This can indicate it for use as long term appliances as retainers due to their assumed higher longevity and retentive forces. | ||||
| Keywords | ||||
| Tensile strength; Microhardness; Retention force | ||||
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