Digital-aided design and manufacture of a new open-window customized pallet accuracy and fitness study
Objective:To design and fabricate a new open-window customized tray by newly developed digital software,and to eval-uate its accuracy and fitness.Methods:A matte metal model of a standard mandibular Ken's class Ⅱ dental defect was selected as the initial model,scanned by a desktop scanner and saved in STL format.The model inverted concave filling,tray edge line and support bracket were completed in tray design software;handles,overflow holes and occlusal dike structures were added to complete the tray design.3D printing technology was used to produce 10 pairs of new open-window customized pallets made of polyacrylic acid.The pal-lets were scanned and the data were imported into Geomagic software,the pallet tissue surface was taken as a common area,the pallet CAD data were aligned with the 3D scanning data,and the deviation between the two was mesured by 3D deviation analysis.The"pal-let-model"data was obtained by repositioning the pallet on the initial model and imported into Geomagic software,and the"initial model"and"pallet"data were aligned to the"pallet-model"and"pallet"data respectively.The"initial model"and"pallet"data were aligned to the"pallet-model"data,and the distance deviation between the pallet inner surface data and the initial model data was measured and analyzed.Results:The average deviation of the inner surface printing accuracy of the new windowed customized pallet from the overall RMS estimate(mm)of the design data was 0.140±0.021,that of the support bracket area 0.115±0.024,and that of the free end saddle base area 0.185±0.036,respectively.The average deviation of the average gap size(mm)between the in-ner surface of the pallet and the outer surface of the initial model was 0.998±0.042,that of the support bracket area 0.1 1 9±0.048,and that of the saddle-base area of the free end 0.989±0.082,respectively.Conclusion:The new pallet made by the newly developed software has good accuracy and suitability,and can be used for the fabrication of corrective impressions for free-end dental defects.
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