Materials and methods of making temporary restorations
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Katedra Protetyki Stomatologicznej, Warszawski Uniwersytet Medyczny, Polska
Milena Małgorzata Pawlik   

Katedra Protetyki Stomatologicznej, Warszawski Uniwersytet Medyczny, Binieckiego 6, 02-097, Warszawa, Polska
Submission date: 2022-06-07
Final revision date: 2022-06-21
Acceptance date: 2022-09-06
Publication date: 2022-09-07
Prosthodontics 2022;72(3):272–281
Temporary restorations play an important role in the process of making permanent prosthetic restorations. They can be fabricated using three methods: direct, indirect and mixed (direct-indirect). Temporary crowns and bridges in the direct method are made by a dentist at the dental chair using ready-made crowns, celluloid matrices, alginate or silicone impressions taken before tooth preparation, and CAD/CAM technology. In the indirect method, temporary restorations are made by a dental technician on the basis of impressions taken after grinding the abutment teeth. However, in the mixed method, the matrix for the temporary restoration is created in the lab, and the temporary restoration itself is made in the office in the same way as in the direct method with the use of a celluloid matrix and selected material for temporary crowns and bridges. Acrylic and composite materials are used to make temporary prostheses are. Due to the unfavorable properties of acrylic materials, such as exothermic reaction during setting and high polymerization shrinkage, these materials are not recommended for direct fabrication of temporary restorations. The most commonly used acrylic material is polymethyl methacrylate (PMMA), which is successfully used in indirect methods and CAD/CAM technology, where there is no risk of pulp irritation. In contrast, composite materials are used in all direct, indirect and mixed methods. The main advantages of these materials are hardness, low polymerization shrinkage and low polymerization temperature.