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1Bleaching Tray Fabrication: Traditional Tray fabrication begins with a good alginate impression; Wipe alginate on the occlusalsurfaces and facial of the central incisors to avoid bubbles. Van H aywood 2009Wrap the alginate in a wet paper towel, the pour the alginate impression soon without bubbles to generate an undistorted cast.PVS putty-wash as a one step technique makes a good impression that does not have to poured as quickly. Minimally wait one hour to pour. To avoid damage to the teeth, trim the cast from the bottom rather than the side. For adequate vacuum, there should be a hole in the center or horseshoe shape to the cast. Align the cast in the model trimmer, and trim with a firm grasp but light pressure The cast should be rinsed periodically to avoid slurry build-up on the stone.The cast is ideally in a horseshoe shape. Care must be taken not to break it. The vestibule is removed to insure good adaptation and avoid bridging of the material during formation.An ideal cast with a flat base, horse-shoe shaped, and central incisors perpendicular to the base.The angle of the central incisors avoids folds in the vacuum formed material later.
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