ABSTRACT
A plethora of new low-viscosity composite resin materials, or flowable composites, have been marketed during the last two years, but little has been published about them. The authors describe research in which they compared the properties--filler, depth or cure, flow, wear, compressive strength, diametral tensile strength, indented biaxial flexure strength and toughness--of flowable and hybrid composites. Mechanical property tests (ISO 4049, ISO/DIS 6872) of eight flowable composites and two hybrid composites were conducted. The flowable composite with the least flow was similar to traditional composites. Mechanical properties were generally about 60 to 90 percent of those of conventional composites. The authors conclude that flowable materials should be used with caution in high-stress applications for restorative dentistry.
Subject(s)
Composite Resins/chemistry , Dental Materials/chemistry , Chemical Phenomena , Chemistry, Physical , Composite Resins/analysis , Compressive Strength , Dental Materials/analysis , Dental Restoration, Permanent , Dentin-Bonding Agents/analysis , Dentin-Bonding Agents/chemistry , Humans , Materials Testing , Pliability , Rheology , Silicon Dioxide/analysis , Silicon Dioxide/chemistry , Stress, Mechanical , Tensile Strength , Viscosity , Zirconium/analysis , Zirconium/chemistryABSTRACT
OBJECTIVE: A search was conducted in biomedical journals published from January 1997 to June 1997 to identify all dental materials publications and sort them into major categories. METHODS: Tables of contents for 79 journals for the period of January to June, 1997 were inspected and divided into 17 categories. Citations were analyzed by both frequency in journals and in categories, as well as compared to frequencies for previous years. RESULTS: A total of 445 citations were detected in 79 journals for the period January 1997 to June 1997. Certain journals (n = 19) demonstrated a higher citation frequency (> or = 10 citations for 6 months) and represented 77.8% of all citations. The greatest number of citations continued to involve bonding (n = 97), resin-based restorative materials (composites; glass ionomers) (n = 95), prosthodontic materials (n = 51), and pulp protection/luting materials (n = 48). Frequencies by category were very similar to those for the last four years. SIGNIFICANCE: The compiled literature citations provide a supplement for researchers and academicians seeking information in existing electronic databases.
