Predictability of Part-time Wearing of Removable Clear Aligner Therapy versus Full-Time, using Maestro Software: Randomized Clinical Trial / Mohamed Adel Zein Elabdin Mousa B.D.S. Alexandria University (2017), Supervisors Dr. Hala M. AbdelMajeed, Professor of Orthodontics Faculty of Oral and Dental medicine, Future University in Egypt, Dr. Fouad A. El Sharaby, Professor of Orthodontics Faculty of Dentistry, Cairo University, Dr. Ahmed M. Eltimamy Lecturer of Orthodontics Faculty of Dentistry, Cairo University.

Thesis Submitted to the Faculty of Oral and Dental Medicine Future University in Egypt For Partial Fulfilment of the Requirements for master’s degree in Orthodontics. 2023

Includes bibliographical references.

Clear aligner therapy has gained great popularity throughout the years, many factors affect the success of the treatment outcome including aligner material, staging of tooth movement, attachments on teeth, integration of inter-arch elastics, interproximal reduction and finally wearing time of the aligners(6,7).
There was no enough evidence in the literature addressing the wearing time of the aligners and evaluating the decreased effect of lesser daily wearing time. Therefore, this study was conducted on 14 patients of mild to moderate crowding or spacing to investigate the outcomes of different daily wearing times(75).
Patients were randomly allocated into two groups, the first group was instructed to wear the aligners 16 hours per day (part-time), and the other group was instructed to wear the aligners 22 hours per day (full-time).
Full set of pre-treatment records were taken. Impressions were taken and scanned. Maestro software was used for staging of tooth movement. STL files were exported, and 3D printed then the models were thermoformed by positive pressure using 0.75 mm thickness Zendura sheets. Aligners were delivered to the patients every two weeks(64).
Impressions were taken after aligner number 4 (T4) and 8 (T8) and scanned. The data was measured by superimposing the software predicted STL over clinically achieved model. Linear and angular measurements were collected using Geomagic software to measure the difference between the predicted and actual outcome (92).

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