Introduction: With the increasing longevity of the population, we are meeting more and more people who need prosthetic care. Clinics are increasingly overburdened with elderly patients who are missing one or more teeth, or may be completely toothless. In the event that it is not possible to provide fixed prosthetic care to such patients due to various factors, we use the production of partial or total prostheses, which restore the patient’s appearance, proper speech, breathing, chewing function, and thus improve their well-being and social integration. Despite the fact that the prosthesis is properly made and fits properly on the teeth and other supporting tissues, the resorption of the ridge alveolar bone is an irreversible process that cannot be stopped. While wearing the prosthesis, a pressure occurs, which can cause pain, non-fitting and movement of the prosthesis, and patients who experience this often no longer use the removable prosthetic replacement. Because we want to satisfy patients and improve their experience of wearing the prosthesis, the prosthesis must be lined with appropriate material for a certain period of time, which restores the function of the prosthesis and the fit to the supporting tissues, but because in some patients the mucous membrane is so thin that hard acrylate on the base is painful and unsuitable for wearing, we can use a soft relining material. which is very similar in characteristics to the mucousa. Purpose: The purpose of the thesis is to review soft relining materials, their properties and the laboratory description of soft underlay techniques, as well as the disadvantages that can occur with the time of wearing a prosthesis that is relined with these types of materials. Based on the findings, we want to determine whether the use of a soft relining material is appropriate and reasonable for patient satisfaction and a good prosthesis wearing experience. Methods: The method of work in the theoretical part of the diploma is descriptive. As the main source of information, we used professional books, articles from professional journals and professional articles on the Internet. For literature search we used libraries and professional databases such as Google Scholar, Cobiss, Mdpi, PubMed and Science Direct. In the laboratory, under the supervision of a mentor, we carried out the procedure of soft relining of the prosthesis with Molloplast® B material, using the technique of relining with a flask. Results: The results show that in patients who face pain under the base of the prosthesis, the quality of life and the functionality of the prosthesis itself are improved by underlining with a soft backing material. Since soft underlay materials have mucosal-like properties, chewing forces are distributed and, as a result, reduce pain and damage to the supporting tissues under the prosthesis. However, the use and hygiene of a softly lined prosthesis is demanding, which means that we must teach users about them well. Discussion and conclusion: Research confirms that softly relined total and partial dentures can improve speech, chewing and other functional aspects, which also require proper hygiene and patient education. Nevertheless, most of the currently available materials have several drawbacks, and advances in technology tend to eliminate them as much as possible. Desirable properties of soft backing materials include: good viscoelastic properties, high bond strength with the base material based on the prosthesis, dimensional stability, permanent softness or flexibility, low water absorption, color stability, resistance to the formation of microbial colonies, and ease of use and processing. With continuous improvements, we want to provide patients with the best possible quality of life and good experience of wearing dentures.
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