2.5.1. Construction of Removable Appliance with Acrylic Tiles of Different Surface Textures
Acrylic tiles (5.5 mm × 1 mm) of two surface textures were made from an acrylic block of 1 mm thickness using a mould of silicone rubber (Rema® Sil silicone duplicating material, Dentaurum, Ispringen, Germany) [After obtaining the consent form, an impression was taken on the maxillary arch using alginate impression material (Hydrogum 5, Zhermack, Badia Polesine, Italy). The negative replica was then poured using type IV stone to make a study model and coated with a separating medium (Separating Agent, Shanghai New Century Dental Materials Co., Ltd., Shanghai, China). Eight detachable metal discs of 5.5 mm × 1.2 mm were distributed on the palatal side of the stone model (The acrylic tiles, with different roughnesses, were randomly seated and fixed into the wells using sticky wax (The appliance was sterilized using 115 V UV light in a UV sterilization hood (Dahian Labtech Co., Laminar hood, Korea) for 15 minutes [