title: Controlled, prospective, randomized, clinical split-mouth evaluation of partial ceramic crowns luted with a new, universal adhesive system/resin cement: results after 18 months.
abstract: OBJECTIVE
  A new universal adhesive with corresponding luting composite was recently marketed which can be used both, in a self-etch or in an etch-and-rinse mode. In this study, the clinical performance of partial ceramic crowns (PCCs) inserted with this adhesive and the corresponding luting material used in a self-etch or selective etch approach was compared with a self-adhesive universal luting material.
  
  
  METHODS
  Three PCCs were placed in a split-mouth design in 50 patients. Two PCCs were luted with a combination of a universal adhesive/resin cement (Scotchbond Universal/RelyX Ultimate, 3M ESPE) with (SB+E)/without (SB-E) selective enamel etching. Another PCC was luted with a self-adhesive resin cement (RelyX Unicem 2, 3M ESPE). Forty-eight patients were evaluated clinically according to FDI criteria at baseline and 6, 12 and 18 months. For statistical analyses, the chi-square test (α = 0.05) and Kaplan-Meier analysis were applied.
  
  
  RESULTS
  Clinically, no statistically significant differences between groups were detected over time. Within groups, clinically significant increase for criterion "marginal staining" was detected for SB-E over 18 months. Kaplan-Meier analysis revealed significantly higher retention rates for SB+E (97.8 %) and SB-E (95.6 %) in comparison to RXU2 (75.6 %).
  
  
  CONCLUSIONS
  The 18-month clinical performance of a new universal adhesive/composite combination showed no differences with respect to bonding strategy and may be recommended for luting PCCs. Longer-term evaluation is needed to confirm superiority of SB+E over SB-E.
  
  
  CONCLUSIONS
  At 18 months, the new multi-mode adhesive, Scotchbond Universal, showed clinically reliable results when used for luting PCCs.
authors.affiliation: Dental School, Department of Operative Dentistry and Periodontology, University Medical Center Regensburg, Franz-Josef-Strauss-Allee 11, 93042, Regensburg, Germany. vanessa.vogl@ukr.de.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Vogl
authors.affiliation: Dental School, Department of Operative Dentistry and Periodontology, University Medical Center Regensburg, Franz-Josef-Strauss-Allee 11, 93042, Regensburg, Germany.
authors.forename: Karl-Anton
authors.initials: KA
authors.lastname: Hiller
authors.affiliation: Dental School, Department of Operative Dentistry and Periodontology, University Medical Center Regensburg, Franz-Josef-Strauss-Allee 11, 93042, Regensburg, Germany.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Buchalla
authors.affiliation: Dental School, Department of Operative Dentistry and Periodontology, University Medical Center Regensburg, Franz-Josef-Strauss-Allee 11, 93042, Regensburg, Germany.
authors.forename: Marianne
authors.initials: M
authors.lastname: Federlin
authors.affiliation: Dental School, Department of Operative Dentistry and Periodontology, University Medical Center Regensburg, Franz-Josef-Strauss-Allee 11, 93042, Regensburg, Germany.|Department of Preventive, Restorative and Pediatric Dentistry, University School of Dental Medicine Bern, Freiburgstrasse 7, 3010, Bern, Switzerland.
authors.forename: Gottfried
authors.initials: G
authors.lastname: Schmalz
mesh_terms: D000328:Adult; D000368:Aged; D002516:Ceramics / Q000737:chemistry*; D003442:Crowns; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005260:Female; D006801:Humans; D008297:Male; D008422:Materials Testing; D008875:Middle Aged; D011446:Prospective Studies; D019279:Resin Cements / Q000737:chemistry*
chemical_list: D017220:Dentin-Bonding Agents; C483701:Rely X Unicem; D019279:Resin Cements; C041330:Scotchbond
keywords: FDI criteria; Multi-mode adhesive; Partial ceramic crowns; Prospective clinical study; Self-adhesive resin cement