title: Influence of photopolymerization parameters on the mechanical properties of polymer-ceramic composites applied in the conservative dentistry.
abstract: In this paper, the results of study of mechanical properties for four commercial polymer-ceramic composites applied in the conservative dentistry are presented, including one new silorane based composite and three standard composites based on methacrylate compounds. Influence of the type of light of diode and halogen polymerization lamps on the microhardness, flexural strength and elasticity were studied. Both exposed and unexposed specimens were taken into account. An exposure time was also differentiated (40 sec and 60 sec). Basic statistics of the analysed material parameters were determined. A post hoc test (Newman-Keuls) was performed in order to evaluate differences between microhardness of the materials studied, as well as Kruskal-Wallis test to evaluate differences in flexural strength and elasticity modulus of the material. It has been indicated that there is an impact of the type of lamp on the microhardness and flexural strength of composites with methacrylate matrix and lack of such impact in the case of composites containing siloranes. Additionally, it has been found that an increase of photopolymerization time has a significantly different impact on the mechanical properties depending on the type of irradiated material.
authors.affiliation: Main School of Fire Service, Fire Safety Engineering Faculty, Department of Firefighting Technique, Applied Mechanics Section.
authors.forename: Daniel
authors.initials: D
authors.lastname: Pieniak
authors.affiliation: Department of Conservative Dentistry Medical University of Lublin.
authors.forename: Agata M
authors.initials: AM
authors.lastname: Niewczas
authors.affiliation: Department of Materials Science, Lublin University of Technology.
authors.forename: Mariusz
authors.initials: M
authors.lastname: Walczak
authors.affiliation: Department of Conservative Dentistry Medical University of Lublin.
authors.forename: Jolanta
authors.initials: J
authors.lastname: Zamościńska
mesh_terms: D002516:Ceramics / Q000737:chemistry* / Q000528:radiation effects; D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D019245:Compressive Strength; D003764:Dental Materials / Q000737:chemistry* / Q000528:radiation effects; D017220:Dentin-Bonding Agents / Q000737:chemistry* / Q000528:radiation effects; D055119:Elastic Modulus; D006244:Hardness; D008027:Light; D008422:Materials Testing; D011108:Polymers / Q000737:chemistry* / Q000528:radiation effects; D013314:Stress, Mechanical; D013718:Tensile Strength
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D011108:Polymers