In prosthodontics, 3D printing primarily relies on intraoral scanners equipped with a handheld camera, computer, and software. These scanners capture and reconstruct the three-dimensional geometry of the dental arch. Traditional plaster models of teeth are typically obtained through an impression process, where the choice of appropriate impression material is determined by the desired model type. Subsequently, the dental impression is covered with plaster in the laboratory. Three-dimensional (3D) printing, formerly an industrial technology with a development history spanning over forty years, is based on creating a 3D model of any shape from a digitally prepared scan, employing an addition of selected material. The thickness of the layers in the printing process depends on the technology of the used printer and the quality of the print. The layers are systematically applied, and cured, and, after this process, a complete model is generated. 3D printing can be utilized to prepare models for various applications, including prosthodontics, orthodontics, surgery, and more. Our study aimed to assess stereolithography-printed models in vitro and in vivo over the last three years.
KEYWORDS: Teeth, Semiconductor lasers, Diodes, Temperature metrology, Infrared lasers, 3D modeling, Laser dentistry, Scanning electron microscopy, Hydrogen, Electron microscopes
The study describes a diode system which activates a home-bleaching agent for discolored teeth. The techniques involve pastes utilizing 16 % hydrogen and carbamide peroxide. Two different laser diodes operating at 445 nm and 1.7 um were used. The exposition power densities used were up to 10 W/cm2. For bleaching, stereolithographic models and trays were prepared. Bleaching technique was activated laser irradiation lasting for 100 s, bleaching. After the bleaching process, the enamel surface was with the scanning electron microscope. This process resulted in a 2-3 shade change measurement in one treatment.
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