Invitro Evaluation of Forces Delivered by Aligners Fabricated using Positive Air Pressure versus Negative Air Pressure.
Hamed, N., Hassan, I., Elghoul, D., Elabbassy, E., Zaky, A. (2024). Invitro Evaluation of Forces Delivered by Aligners Fabricated using Positive Air Pressure versus Negative Air Pressure.. EKB Journal Management System, 70(1), 53-58. doi: 10.21608/edj.2023.248370.2780
Nada Hamed; Islam Tarek Hassan; Dina Hussein Elghoul; Eman Hossameldin Elabbassy; Ahmed Zaky. "Invitro Evaluation of Forces Delivered by Aligners Fabricated using Positive Air Pressure versus Negative Air Pressure.". EKB Journal Management System, 70, 1, 2024, 53-58. doi: 10.21608/edj.2023.248370.2780
Hamed, N., Hassan, I., Elghoul, D., Elabbassy, E., Zaky, A. (2024). 'Invitro Evaluation of Forces Delivered by Aligners Fabricated using Positive Air Pressure versus Negative Air Pressure.', EKB Journal Management System, 70(1), pp. 53-58. doi: 10.21608/edj.2023.248370.2780
Hamed, N., Hassan, I., Elghoul, D., Elabbassy, E., Zaky, A. Invitro Evaluation of Forces Delivered by Aligners Fabricated using Positive Air Pressure versus Negative Air Pressure.. EKB Journal Management System, 2024; 70(1): 53-58. doi: 10.21608/edj.2023.248370.2780

Invitro Evaluation of Forces Delivered by Aligners Fabricated using Positive Air Pressure versus Negative Air Pressure.

Egyptian Dental Journal
Volume 70, Issue 1, January 2024, Page 53-58  XML PDF (825.02 K)
Document Type: Original Article
DOI: 10.21608/edj.2023.248370.2780
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Authors
Nada Hamed email orcid 1; Islam Tarek Hassanorcid 2; Dina Hussein Elghoulorcid 3; Eman Hossameldin Elabbassyorcid 4; Ahmed Zakyorcid 5
1Instructor, Orthodontic Department, Faculty of Dentistry, Ain Shams University, Cairo-Egypt
2Professor and Head of Department, Orthodontic Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
3Professor, Orthodontic Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
4Associate Professor, Orthodontic Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
5Lecturer, Orthodontic Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
Abstract
Objective: To measure the difference in force delivery between aligners fabricated using positive air pressure versus negative air pressure.

Material and methods: A series of clear aligners of similar material composition (PET-G), manufacturer (Scheu Dental), thickness (0.75mm) and activation of 0.2mm uncontrolled palatal tipping on the upper left central incisor were designed and fabricated using two different methods of fabrication. The first set of aligners (n=5) were fabricated via positive air pressure using MiniStarS pressure thermoforming and the second set (n=5) were fabricated via negative air pressure using the PlastVac P7 vacuum forming machine. A force change measurement system was used to measure changes in the forces delivered by the pressure formed and vacuum formed PET-G materials. Statistical analysis was carried independent samples t test to compare between pressure formed and vacuum formed force values using Significance level was considered at P < 0.05.

Results: There was a statistically significant increase in force values delivered by aligners thermoformed using positive air pressure compared to aligners fabricated using negative air pressure. Forces delivered by vacuum formed aligners averaged to 0.40N compared with 1.01N for aligners thermoformed using positive air pressure.

Conclusions: The forces delivered by aligners are influenced by the fabrication process; aligners fabricated using positive pressure showed increased fit and adaptation on the resin model which led to an increase in the delivered forces compared to aligners fabricated using negative pressure.
Keywords
Aligners; Force; Positive air pressure
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