title: The effect of zirconia thickness and curing time on shear bond strength of dualcure resin cement.
abstract: This study evaluated how zirconia thickness affects shear bond strength (SBS) between zirconia and dual-cure resin cement. Eighty specimens (40 blocks of 1 mm thickness zirconia and 20 of each 1.5 and 2 mm) were divided into 8 groups according to zirconia thickness and light-curing time. Group A, B, C, and D were light-polymerized during 20 s and group E, F, G, and H were light-cured during 40 s. Self-adhesive dual-cure resin cement was placed onto the zirconia surfaces and then light-polymerized. The mean SBS of the 40 s curing time group was statistically higher than that of the 20 s curing time group. However, curing time did not affect the SBS significantly in the 2 mm thickness groups. The mean SBS of the 1.5 and 2 mm groups were statistically lower than those 1 mm groups. Therefore, zirconia thickness significantly affected the SBS of self-adhesive dual-cure resin cement.
authors.affiliation: Department of Conservative Dentistry and Prosthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea.
authors.forename: Su-Young
authors.initials: SY
authors.lastname: Lee
authors.forename: Chang-Bin
authors.initials: CB
authors.lastname: Cho
authors.forename: Jai-Young
authors.initials: JY
authors.lastname: Koak
authors.forename: Sung-Eun
authors.initials: SE
authors.lastname: Yang
mesh_terms: D020906:Air Abrasion, Dental; D055117:Curing Lights, Dental; D003799:Dental Stress Analysis; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D013499:Surface Properties; D013997:Time Factors; D015040:Zirconium / Q000737:chemistry*
chemical_list: C095997:DCR cement; C587242:RelyX U200; D019279:Resin Cements; D015040:Zirconium; C028541:zirconium oxide