Mechanical properties of provisional dental materials: A systematic review and meta-analysis

Abstract

Provisional restorations represent an important phase during the rehabilitation process, knowledge of the mechanical properties of the available materials allows us to predict their clinical performance. At present, there is no systematic review, which supports the clinicians’ criteria, in the selection of a specific material over another for a particular clinical situation. The purpose of this systematic review and meta-analysis was to assess and compare the mechanical properties of dimethacrylates and monomethacrylates used in fabricating direct provisional restorations, in terms of flexural strength, fracture toughness and hardness. This review followed the PRISMA guidelines. The searches were conducted in PubMed, Embase, Web of Science, Scopus, the New York Academy of Medicine Grey Literature Report and were complemented by hand-searching, with no limitation of time or language up to January 10, 2017. Studies that assess and compare the mechanical properties of dimethacrylate- and monomethacrylate-based provisional restoration materials were selected. A quality assessment of full-text articles were performed according to modified ARRIVE and CONSORT criteria and modified Cochrane Collaboration’s tool for in vitro studies. Initially, 256 articles were identified. After removing the duplicates and applying the selection criteria, 24 articles were included in the qualitative synthesis and 7 were included in the quantitative synthesis (meta-analysis). It may be concluded that dimethacrylate-based provisional restorations presented better mechanical behavior than monomethacrylate-based ones in terms of flexural strength and hardness. Fracture toughness showed no significant differences. Within the monomethacrylate group, polymethylmethacrylate showed greater flexural strength than polyethylmethacrylate.

A review on chemical composition, mechanical properties, and manufacturing work flow of additively manufactured current polymers for interim dental restorations

“…When performing interim restorations, there are a limited number of AM polymers available and approved for intraoral use (Table ) . Conventional provisional materials can be divided into 2 groups according to their chemical composition: those based on monomethacrylates or acrylic resins and those based on dimethacrylates or bis‐acryl/composite resins such as bisphenol A‐glycidyl dimethacrylate and urethane dimethacrylate (these resins are polymerized by light) . AM provisional materials seem to follow the same classification, and some information regarding their chemical composition is listed in Table .…”

“…19,30,31 The mechanical properties of conventional provisional dental materials are better described in the literature. 29,[32][33][34] However, authors of the present review attempted to collect a complete description of the mechanical properties of 3D-printing provisional materials directly from the manufacturers (Tables 3 and 4), but not all of the requested information was released.…”

Wear resistance and microhardness of various interim fixed prosthesis materials

“…Wear is typically evaluated based on the net loss of material from a surface under operational conditions. Even though there are several published studies about the mechanical properties of interim prostheses (8,9,(12)(13)(14)(15)(16), little is known about their wear resistance. According to Santing et al (17), the use of indirect composite resin is preferred over chair-side methacrylate-based materials when the interim restoration must be in service for a long period of time.…”

Molde de silicone baseado em dentição natural: técnica para mimetizar a textura superficial dentária em resina composta

“…Em casos envolvendo a estética dentária, a antevisão e o acurado planejamento, são necessários para garantir o mais adequado resultado 4,5 . Mudanças estéticas ou funcionais são melhor experimentadas com restaurações provisórias, de modo que as modificações possam ser facilmente realizadas intraoralmente ou quando satisfatoriamente copiadas para as restaurações definitivas 6 .…”

“…O enceramento diagnóstico, técnica tradicionalmente utilizada por muitos profissionais da odontologia 7 , e a confecção de restaurações provisórias, quando adequadamente fabricadas, permitem melhor planejamento e determinação dos requisitos estéticos e funcionais de procedimentos restauradores finais 6,8,9 .…”