1.
Laboratory and clinical evaluation of polymer materials reinforced by fibers used in dentistry.
Brożek, R, Koczorowski, R, Dorocka-Bobkowska, B
European review for medical and pharmacological sciences. 2019;(5):1855-1863
Abstract
OBJECTIVE Fiber-reinforced composites (FRC) because of high strength and a low mass can be widely applied in many fields of dentistry. MATERIALS AND METHODS The types of fibers commonly used in dentistry with the description of physicochemical properties of the reinforcing phase and polymer resin, are specified. The influence of the method of fiber positioning in the sample, their diameter, length and shape of fibers visible in cross-section on the strength of the FRC material, are underlined. The work also paid attention to the volume of the material that occurs as a result of the absorption of water from the oral environment and changes in bonding between matrix and fiber. RESULTS The clinical procedures and a description of failures that may possibly happen in the oral cavity presented in the work, confirm that they allow fabrication of minimally invasive, lightweight, durable and biocompatible materials. At the moment, the only material group that can be used by direct technique to reach high load-bearing capacity restorations is FRC. CONCLUSIONS Long-term treatment effectiveness makes FRCs an alternative to prosthetic restorations whose retention is obtained only as a result of mechanically interlocking to the abutment tooth. The use of FRCs in clinical dentistry is part of value-based medicine.
2.
Update on dental nanocomposites.
Chen, MH
Journal of dental research. 2010;(6):549-60
Abstract
Dental resin-composites are comprised of a photo-polymerizable organic resin matrix and mixed with silane-treated reinforcing inorganic fillers. In the development of the composites, the three main components can be modified: the inorganic fillers, the organic resin matrix, and the silane coupling agents. The aim of this article is to review recent studies of the development of dental nanocomposites and their clinical applications. In nanocomposites, nanofillers are added and distributed in a dispersed form or as clusters. For increasing the mineral content of the tooth, calcium and phosphate ion-releasing composites and fluoride-releasing nanocomposites were developed by the addition of DCPA-whiskers or TTCP-whiskers or by the use of calcium fluoride or kaolinite. For enhancing mechanical properties, nanocomposites reinforced with nanofibers or nanoparticles were investigated. For reducing polymerization shrinkage, investigators modified the resin matrix by using methacrylate and epoxy functionalized nanocomposites based on silsesquioxane cores or epoxy-resin-based nanocomposites. The effects of silanization were also studied. Clinical consideration of light-curing modes and mechanical properties of nanocomposites, especially strength durability after immersion, was also addressed.
3.
Monomer systems for dental composites and their future: a review.
Vasudeva, G
Journal of the California Dental Association. 2009;(6):389-98
Abstract
This review discusses the history of monomers used in resin composites, highlights recent and ongoing research reported in the field of dental monomer systems, and future development. The main deficiencies of current resin composites are polymerization shrinkage and insufficient wear resistance under high masticatory forces. The problem has been approached with the synthesis of potentially low-shrinking/nonshrinking resin composites. Monomer systems have been formulated that improve the degree of conversion and mechanical properties.