title: Leucite-reinforced glass ceramic inlays luted with self-adhesive resin cement: a 2-year in vivo study.
abstract: OBJECTIVE
  Aim of the present prospective controlled clinical study was to compare the clinical performances of two different cementation procedures to lute IPS Empress inlays and onlays.
  
  
  METHODS
  Eighty-three IPS Empress restorations (70 class-II inlays, 13 onlays/47 premolars, 36 molars) were placed in 30 patients (19 females/11 males, mean age=39 years). Two cementation procedures were tested: group 1: forty-three restorations were luted with a self-adhesive resin cement (RelyX Unicem, RX, 3M ESPE); group 2: forty restorations were luted with an etch-and-rinse multistep adhesive (Syntac Classic, Ivoclar-Vivadent) and Variolink II low (SV, Ivoclar-Vivadent). All restorations were evaluated after 2 weeks (baseline=1st recall=R1, n=83), 6 months (R2, n=83), 1 year (R3, n=82), and 2 years (R4, n=82) by two independent blinded calibrated examiners using modified USPHS criteria.
  
  
  RESULTS
  From R1 to R4, one failure occurred in the SV group (at R2) due to marginal enamel chipping. After 2 years of clinical service (R4), better marginal and tooth integrity (p<0.05) was found in group 2 (SV) compared to the use of the self-adhesive cement (RX, group 1), while no differences were found for all remaining investigated criteria (p>0.05). The absence of enamel in proximal boxes (10% with no enamel and 51% of the restorations with less than 0.5mm enamel width at the bottom of the proximal box) did not affect marginal performance (p>0.05).
  
  
  CONCLUSIONS
  The self-adhesive resin cement RelyX Unicem showed clinical outcomes similar to a conventional multi-step cementation procedure after 2 years of clinical service for most of the tested criteria.
authors.affiliation: Dental Clinic - Operative Dentistry and Periodontology, University Medical Center Erlangen, University of Erlangen-Nuremberg, Germany. taschner@dent.uni-erlangen.de
authors.forename: Michael
authors.initials: M
authors.lastname: Taschner
authors.forename: Norbert
authors.initials: N
authors.lastname: Krämer
authors.forename: Ulrich
authors.initials: U
authors.lastname: Lohbauer
authors.forename: Matthias
authors.initials: M
authors.lastname: Pelka
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Breschi
authors.forename: Anselm
authors.initials: A
authors.lastname: Petschelt
authors.forename: Roland
authors.initials: R
authors.lastname: Frankenberger
mesh_terms: D000328:Adult; D000538:Aluminum Silicates / Q000737:chemistry*; D002484:Cementation / Q000379:methods; D002516:Ceramics / Q000737:chemistry*; D003116:Color; D003737:Dental Cavity Preparation / Q000145:classification; D003743:Dental Enamel / Q000473:pathology; D018772:Dental Marginal Adaptation; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007284:Inlays; D008297:Male; D008422:Materials Testing; D008875:Middle Aged; D017060:Patient Satisfaction; D011446:Prospective Studies; D019279:Resin Cements / Q000737:chemistry*; D013499:Surface Properties; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D000538:Aluminum Silicates; D003764:Dental Materials; C075815:IPS-Empress ceramic; C483701:Rely X Unicem; D019279:Resin Cements; C078484:Syntac dentine adhesive; D003776:Dental Porcelain; C078519:leucite; C103502:Variolink; C023506:Glass ceramics