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ePaper created 2016-04-19, 11:44:05 | version 1.38.0
clear aligners trends & applications | 17 ortho 1 2016 mentforeachtooth.Usingaheat-generatedvacuum former and 0.5 mm, 0.62 mm, and 0.75 mm laminate foil, three thicknesses of aligners (soft, medium, and hard) were created for each movement or ‘step’ of treatment. Starting with the soft, then medium, and then hard, each aligner is worn for one week before moving on to the next step (Figs. 4 & 5). As effective as handmade aligners are, there are limits in the clinical application. The quality of the alignerdependsupontheexpertiseofthetechnician, evenusingtechnologyliketheCAPROsoftware.Some of the limitations include the tendency for tooth necrosis due to heavy orthodontic forces, as well as inefficienciesintoothmovementormisdirection.To overcome these challenges, it was necessary to de- Fig.6: 3-D eCligner programme enables precision digital tooth movement in full 3-D movement control.Each tooth segment is separated and patterned in hexahedron,controlled by adjustable CR (centre of rotation) point. Fig.7: eCligner diagnostic data for multitasking function,simulation for facial profile change. Fig.8: Multi-overlapping (superimposition) among each 3-D digital set-up model enables measuring the distance and angle directly on the monitor.Each tooth shows current torque and angulation as to progress.Also it is possible to make animation function to compare each movement pattern.Colour and tone change function is helpful to recognise complicated tooth movement among the steps. Fig.9: Doctor view (eCligner Dr Program). Fig.10:Various print function,photo galleries.Model analysis data is useful to determine the amount of stripping. Fig.11: eCligner diagnostic data, cephalo analysis (Tweed,Ricketts, Jarabak,Grummon),P-A view analysis. Fig.6 Fig.8 Fig.9 Fig.10 Fig.11 Fig.7 12016