title: Curing depth of a resin-modified glass ionomer and two resin-based luting agents.
abstract: The degree of conversion of resin-based luting agents used for retention of prefabricated posts has been questioned due to the difficulty of light penetration into the resin-filled root canal. This study evaluated the depth of cure of a resin-modified glass ionomer cement (Rely X--3M ESPE) and two resin-based luting agents (Rely X ARC--3M ESPE and Enforce-Dentsply). Twenty-four 14x2x2mm3 specimens were prepared in a Teflon split mold with the three luting agents (n=8). After preparation, the specimens were stored at 37 degrees C in a dark box for 24 hours prior to microhardness testing. Measurements of Knoop hardness were performed at three different depths: superficial, medium and deep thirds. The results (KHN) were statistically analyzed by repeated measures ANOVA and Tukey test (0.05), which showed that resin-based luting agents presented the highest Knoop hardness values within the superficial third. Within the medium third, there were no significant differences among luting materials. However, within the deep third, Rely X presented the highest values. KHN values of resin-based luting agents decreased remarkably as depth increased.
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil.
authors.forename: Ricardo Massao
authors.initials: RM
authors.lastname: Sigemori
authors.forename: André Figueiredo
authors.initials: AF
authors.lastname: Reis
authors.forename: Marcelo
authors.initials: M
authors.lastname: Giannini
authors.forename: Luís Alexandre M S
authors.initials: LA
authors.lastname: Paulillo
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D011092:Polyethylene Glycols / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D003188:Composite Resins; C103503:EnForce-Sure Cure; D005899:Glass Ionomer Cements; D011108:Polymers; D011109:Polymethacrylic Acids; C462240:RelyX ARC; D019279:Resin Cements; C084550:Vitremer; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate