Although both rigid (impression plaster and zinc oxide-eugenol) and elastic materials (agar, alginate, polyether, condensation silicone (C-silicone), addition silicone (A-silicone), and polysulfide) have been widely used for creating dental impressions, elastic ones are often preferred. Materials selected for dental impressions can significantly influence the accuracy and precision of the impression and, consequently, of the final result. Therefore, the conventional impression technique is often preferred for obtaining full-arch impressions, which are particularly functional impressions for complete denture fabrication.
Moreover, restorative materials present in the oral cavity may reflect light and cause disturbances in three-dimensional images. One of the issues resolved in modern scanners is the low quality of these scans if the abutment is inclined or the span is too long.
Although digital dentistry is fast evolving and displacing conventional methods, dental scans, which are a promising means of taking impressions, still have limitations.
Because dental impressions allow the creation of replicas of patients’ teeth and mouth structures, they play an important role in the appropriate diagnosis and precise design of well-fitted oral appliances. Formation of these impressions is a key stage in the fabrication of dental casts used in prosthetics and orthodontics. However, before recommendation, their usefulness for each individual material should be thoroughly evaluated.ĭental impressions are negative imprints of oral tissues (teeth, gums, and alveolus). Our study demonstrated that, similarly to standard liquid disinfectants, both UVC and ozone do not strongly affect the material properties of most silicones. Both traditional (immersion and spraying) and alternative methods of disinfection (UVC and ozone) had no significant impact on the tensile properties and dimensional stability of the studied silicones however, they significantly affected the hardness, particularly of Oranwash L. Our results revealed that addition silicones had higher dimensional stability, tensile strength, and Shore A hardness compared to condensation silicones. Moreover, as a secondary aim, we performed a statistical comparison of the properties of nondisinfected addition (Panasil Putty Soft, Panasil monophase Medium, Panasil initial contact Light) and condensation silicones (Zetaplus Putty and Oranwash L), as well as a comparison of materials of various viscosities (putty, medium-bodied, and light-bodied). We compared the effects of various methods (UVC, gaseous ozone, commercial solution, and spray) on the dimensional change, tensile strength, and hardness of silicone impressions. There is an ongoing search for novel disinfection techniques that are not only effective, cheap, and convenient, but that also do not have adverse effects on the properties of dental impressions.
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