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.
The aim of our study was 3D objectification of stereolithography prepared printed models. Patients during clinical treatment were scanned by an optical scanner. Data from scanner were transferred to the STL files and then stereolithographic models were prepared. Method of optical triangulation, photogrammetric methods and mathematical model analysis were used for measurements. The surface profile was also evaluated. After three years, the quality of STL models was smooth and homogeneous and it was directly connected with the type and structure of filaments. Clinical applications demonstrated also treatment options for patients with nausea, rare diseases, or with small space between upper and lower jaw.
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