#Comprehensive meta analysis 2 download crack full
In clinical settings such as changes in the vertical dimension in full oral rehabilitation, long-span fixed prostheses, temporomandibular joint dysfunction therapies or patients who exhibit parafunctional habits, the mechanical properties of intermediate restorations play an important role in enabling the dentist to assess commercial products critically and choose the ideal material for a specific clinical situation. Provisional restorations are subjected to chewing forces and require specific mechanical properties that allow them to survive the repeated functional forces of the oral environment, so in order to predict the behavior of a material, it is important to understand its mechanical properties. This improves clinical practice, saves time and money and avoids sending to the laboratory for provisional restoration manufacture by indirect techniques.
The technology of provisional restoration materials has evolved in recent years, giving rise to improvements in the basic chemical composition that have made it possible to obtain commercial products which can be used with direct techniques, with good clinical and mechanical performance. Provisional restoration materials can be divided into two groups according to their chemical composition: those based on monomethacrylates or acrylic resins, which include polymethylmethacrylate (PMMA) and polyethyl/butyl methacrylate (PEMA) and those based on dimethacrylates or bis-acryl/composite resins such as bisphenol A-glycidyl dimethacrylate (Bis-GMA) and urethane dimethacrylate (UDMA these resins are polymerized by light). įabrication of an ideal provisional restoration is crucial for gum health and to protect the pulp, for prosthetically-guided tissue healing to achieve an acceptable emergence profile, for minimizing the migration of dental abutments, and for assessing the prospective form and function of the definitive prosthesis. Dentists can gain their patients’ confidence by handling this intermediate stage of treatment successfully, achieving the necessary predictability for a successful final restoration. In view of the strong demand for good aesthetic results, provisional restorations have become a valuable tool for esthetic and functional diagnosis in dentistry. Provisional or interim restorations are commonly used in dentistry during the time between tooth preparation and placement of the definitive restoration. Within the monomethacrylate group, polymethylmethacrylate showed greater flexural strength than polyethylmethacrylate. Fracture toughness showed no significant differences.
It may be concluded that dimethacrylate-based provisional restorations presented better mechanical behavior than monomethacrylate-based ones in terms of flexural strength and hardness. 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). 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. Studies that assess and compare the mechanical properties of dimethacrylate- and monomethacrylate-based provisional restoration materials were selected. 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. This review followed the PRISMA guidelines. 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. 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. 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.