title: Marginal gap, cement thickness, and microleakage of 2 zirconia crown systems luted with glass ionomer and MDP-based cements.
abstract: This in vitro study evaluated the marginal gap, cement thickness, and microleakage of glass-ionomer cement (GIC) and phosphate monomer-containing resin cement (MDP-RC) under 2 zirconia crown systems (Cercon and DC-Zirkon). Forty human premolars were prepared for all-ceramic zirconia crowns with a 1 mm circumferential finish line and a 1.5 mm occlusal reduction. The crowns (n = 10 per group) from each zirconia system were randomly divided into 2 groups and cemented either with GIC (Vivaglass CEM) or MDP-RC (Panavia F 2.0) cement. The cemented crowns were thermocycled 5000 times (5°-55°C). The crowns were immersed in 0.5% basic fuchsine dye solution for 24 hours and sectioned buccolingually and mesiodistally. Specimens were examined under optical microscope (100X). Data were analyzed using Student t-test and chi-square tests (α = 0.05). Mean marginal gap values for Cercon (85 ± 11.4 μm) were significantly higher than for DC-Zircon (75.3 ± 13.2 μm) (P = 0.018). The mean cement thickness values of GIC (81.7 ± 13.9 μm) and MDP-RC (78.5 ± 12.5 μm) were not significantly different (P = 0.447). Microleakage scores did not demonstrate significant difference between GIC (P = 0.385) and MDP-RC (P = 0.631) under Cercon or DC-Zircon. Considering the cement thickness values and microleakage scores obtained, both zirconia crown systems could be cemented in combination with either GIC or MDP-RC.
authors.forename: Isil
authors.initials: I
authors.lastname: Sener
authors.forename: Begum
authors.initials: B
authors.lastname: Turker
authors.forename: Luiz Felipe
authors.initials: LF
authors.lastname: Valandro
authors.forename: Mutlu
authors.initials: M
authors.lastname: Ozcan
mesh_terms: D001641:Bicuspid / Q000601:surgery; D003188:Composite Resins / Q000627:therapeutic use; D003442:Crowns; D003738:Dental Cements / Q000627:therapeutic use*; D003763:Dental Leakage / Q000209:etiology*; D018772:Dental Marginal Adaptation; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements / Q000627:therapeutic use*; D006801:Humans; D019279:Resin Cements / Q000627:therapeutic use*; D015040:Zirconium / Q000627:therapeutic use*
chemical_list: D003188:Composite Resins; D003738:Dental Cements; D005899:Glass Ionomer Cements; C438843:Panavia-Fluoro; D019279:Resin Cements; C119197:Vivaglass Cem; D015040:Zirconium; C028541:zirconium oxide
keywords: glass ionomer cement; marginal gap; microleakage; resin cement; zirconia