title: Effects of oxalate desensitizer with different resin cement-retained indirect composite inlays on fracture resistance of teeth.
abstract: OBJECTIVE
  This study investigated whether the tubular occluding effect of oxalate desensitizer (OX) during adhesive cementation (three resin cements) influenced fracture resistance of teeth restored with adhesive inlays.
  
  
  METHODS
  Ninety intact maxillary premolars were randomly divided into 9 groups of 10 each. The two control groups were Gr 1, intact teeth and Gr 2, mesio-occlusodistal preparation only. In six experimental groups, the composite inlays were cemented with ED Primer II/Panavia F 2.0, Excite DSC/Variolink II, and One-Step Plus/Duolink according to manufacturers' instructions (Groups 3, 5, and 7, respectively) or with OX during cementation (Groups 4, 6, and 8, respectively). In Group 9, inlays were cemented with a resin cement without adhesive system. After thermocycling, fracture strength was tested. The data were analyzed using two-way and one-way ANOVA and LSD post hoc tests (α = 0.05).
  
  
  RESULTS
  Fracture resistance of the six groups were significantly affected by OX (p = 0.002) but not by the resin cement type (p > 0.05). The interaction of the two factors was statistically significant (p = 0.052). A statistically significant difference between all groups was found (p < 0.001). The mean fracture resistances (N) were: Gr1 = 1168 ± 157,(a) Gr2 = 360 ± 110,(d) Gr3 = 1026 ± 188,(b) Gr4 = 887 ± 143,(c) Gr5 = 1007 ± 132,(b) Gr6 = 810 ± 164,(c) Gr7 = 1033 ± 218,(a) Gr8 = 955 ± 147,(ab) Gr9 = 780 ± 86(c) (groups with the same superscript letter indicate statistical similarity).
  
  
  CONCLUSIONS
  Combining an OX with three resin cements had a significant negative effect on the fracture resistance of premolars restored with composite inlay cemented with Panavia F2.0 and Variolink II, but it had no significant effect when cemented with Duolink.
authors.affiliation: Department of Operative Dentistry, School of Dentistry, Shiraz University of Medical Sciences, Iran.
authors.forename: Fereshteh
authors.initials: F
authors.lastname: Shafiei
authors.forename: Ali Asghar
authors.initials: AA
authors.lastname: Alavi
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Karimi
authors.forename: Elham
authors.initials: E
authors.lastname: Ansarifard
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D001641:Bicuspid / Q000648:ultrastructure; D002484:Cementation / Q000379:methods; D003188:Composite Resins / Q000737:chemistry*; D003737:Dental Cavity Preparation / Q000295:instrumentation / Q000379:methods; D045662:Dental Etching / Q000379:methods; D003764:Dental Materials / Q000737:chemistry*; D019232:Dental Restoration Failure; D003804:Dentin / Q000648:ultrastructure; D057133:Dentin Desensitizing Agents / Q000737:chemistry*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D007284:Inlays; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D010070:Oxalates / Q000737:chemistry*; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014082:Tooth Fractures / Q000503:physiopathology*
chemical_list: C103506:Bis-GMA, BPDM, HEMA dental-bonding resin; D003188:Composite Resins; D003764:Dental Materials; D057133:Dentin Desensitizing Agents; D017220:Dentin-Bonding Agents; C431350:Duo-Link; C500742:ED Primer II; C420130:Excite cement; C444701:Filtek Z250; D008689:Methacrylates; D010070:Oxalates; C438843:Panavia-Fluoro; D019279:Resin Cements; C103502:Variolink; D000537:Aluminum Oxide