Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Orthodontics

Through investigating accuracy of two novel three dimensionally digitally printed indirect bonding transfer trays (full arch & segmented) in terms of accuracy of transferring brackets, rate of immediate bond failure and chair side time. Methodology : Twelve patients (6 in each group) with mild to moderate crowding, requiring orthodontic treatment with full set of permanent teeth, will be selected for this study. A total of 144 attachments will be used (72 Full Arch Tray and 72 Segment Arch Tray).The same bracket type and bonding material will used in both groups.The accuracy of bracket transfer will be measured by 3 Shape Ortho planner software (Bracket Placement Module), rate of bond failure by counting number of debonded brackets upon tray removal & chair side time by using digital stop watch. Results: Linear attachment deviations were within the clinically acceptable range of deviation (+/- 0.5 mm) in all three planes for both techniques.There was no statistically significant difference between two techniques regarding mesio-distal and bucco-lingual linear deviations. Both techniques showed no differences in linear directional deviation in the mesio-distal plane, but there were more occlusal and buccal bias deviations in both techniques. Both techniques appeared to be comparable for the percentage of angular directional deviation and torqueing and rotational deviation. Segmented tray technique showed less bond failure rates compared to the full arch tray technique, however the percentage of tube failure was higher than bracket failure in both indirect bonding techniques.The chairside time difference between the two indirect bonding techniques was statistically significant, with the full arch tray technique taking less chairside time than segmented tray technique

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