title: Microleakage of adhesive and nonadhesive luting cements for stainless steel crowns.
abstract: OBJECTIVE
  This study's purpose was to compare the ability of 5 luting cements to reduce microleakage at stainless steel crown (SSC) margins on primary molar teeth.
  
  
  METHODS
  Standard preparations were performed on 100 extracted primary molar teeth for SSC restoration. After  fitting SSCs, samples were randomly divided into 5 groups of 20 teeth each, which were cemented with nonadhesive cement consisting of polycarboxylate (PC) or zinc phosphate (ZP), or with adhesive cement consisting of glass ionomer (GIC), resin-modified glass ionomer cement (RMGIC), or RMGIC  with a bonding agent (RMGIC+DBA). After aging and thermocycling, the specimens were placed in 1% methylene blue, sectioned, and evaluated under a digital microscope. The data were compared between groups with the t test, analysis of variance, and the least significant difference test.
  
  
  RESULTS
  Microleakage with adhesive cements was significantly lower than with nonadhesive cements (P<.05). Differences between cements were statistically significant at P<.001. RMGIC+DBA showed the lowest microleakage, followed in increasing order by RMGIC, GIC, and ZP. The PC cement showed the  greatest microleakage.
  
  
  CONCLUSIONS
  Adhesive cements were more effective in reducing microleakage in stainless steel crowns than nonadhesive cements. Use of a bonding agent with a resin-modified glass ionomer cement yielded better results than using the latter alone.
authors.affiliation: Pediatric Dentistry Department, Dental Faculty, Shiraz University of Medical Sciences, Iran. memarpour@sums.ac.ir
authors.forename: Mahtab
authors.initials: M
authors.lastname: Memarpour
authors.forename: Maryam
authors.initials: M
authors.lastname: Mesbahi
authors.forename: Gita
authors.initials: G
authors.lastname: Rezvani
authors.forename: Mehran
authors.initials: M
authors.lastname: Rahimi
mesh_terms: D002484:Cementation / Q000379:methods; D004396:Coloring Agents; D003442:Crowns; D003722:Dental Alloys / Q000737:chemistry*; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry*; D003763:Dental Leakage / Q000145:classification*; D018772:Dental Marginal Adaptation; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008751:Methylene Blue; D008963:Molar / Q000473:pathology; D011076:Polycarboxylate Cement / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D013193:Stainless Steel / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D019231:Tooth Preparation, Prosthodontic / Q000379:methods; D014094:Tooth, Deciduous / Q000473:pathology; D015036:Zinc Phosphate Cement / Q000737:chemistry
chemical_list: D004396:Coloring Agents; D003722:Dental Alloys; D003738:Dental Cements; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; D011076:Polycarboxylate Cement; D019279:Resin Cements; D013193:Stainless Steel; D015036:Zinc Phosphate Cement; D008751:Methylene Blue