title: Coronal leakage in endodontically treated teeth restored with posts and complete crowns using different luting agent combinations.
abstract: OBJECTIVE
  To evaluate the influence of different cement combinations on coronal microleakage in restored endodontically treated teeth using dye penetration.
  
  
  METHODS
  Human, noncarious single-rooted extracted premolars (n = 60) were divided into four experimental groups (each n = 15). After endodontic treatment, different combinations of cements were used to lute prefabricated posts and complete crown restorations: zinc phosphate cement applied on posts and cast crowns (Z) or on zinc phosphate cement posts and resin cement applied on cast crowns (ZR); resin cement applied on posts and zinc phosphate cement applied on cast crowns (RZ); and resin cement applied on posts and cast crowns (R). After artificial aging through thermal cycling (5°C to 55°C) for 2,000 cycles at 38 seconds for each cycle and 15 seconds of dwell time, specimens were immersed for 72 hours in basic fuchsin at 37°C. A buccolingual section was made through the vertical axis of specimens. A Toolmaker's microscope (Mitutoyo) was used to measure (um) dye penetration. The Kruskal-Wallis nonparametric test was used to determine intergroup difference. A nonparametric Mann-Whitney test compared each group regarding its maximal linear penetration depths on the mesial and distal aspects of each specimen (a = 0.05).
  
  
  RESULTS
  Dye staining was evident to some degree in all specimens. Among groups Z, ZR, and RZ, no significant difference was shown in dye-penetration depths (mean penetration scores 1,518 to 1,807 um). However, dyepenetration depth was significantly lower in group R compared to the other groups (mean penetration score 1,073 um) (P < .05).
  
  
  CONCLUSIONS
  Under study conditions, the cement combination offering the best coronal sealing was the one using only resin cement for both posts and crown restorations.
authors.affiliation: Department of Oral Rehabilitation, The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv, Israel. nissandr@post.tau.ac.il
authors.forename: Joseph
authors.initials: J
authors.lastname: Nissan
authors.forename: Ofir
authors.initials: O
authors.lastname: Rosner
authors.forename: Ora
authors.initials: O
authors.lastname: Gross
authors.forename: Raphael
authors.initials: R
authors.lastname: Pilo
authors.forename: Shaul
authors.initials: S
authors.lastname: Lin
mesh_terms: D000134:Acid Etching, Dental; D001641:Bicuspid / Q000473:pathology; D001729:Bismuth / Q000627:therapeutic use; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D004396:Coloring Agents; D003188:Composite Resins / Q000737:chemistry; D003442:Crowns; D003738:Dental Cements / Q000737:chemistry*; D003763:Dental Leakage / Q000145:classification*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D004853:Epoxy Resins / Q000627:therapeutic use; D006171:Gutta-Percha / Q000627:therapeutic use; D006801:Humans; D008422:Materials Testing; D008853:Microscopy; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D011176:Post and Core Technique; D019279:Resin Cements / Q000737:chemistry; D012387:Root Canal Filling Materials / Q000627:therapeutic use; D012389:Root Canal Obturation; D018915:Root Canal Preparation / Q000379:methods; D012394:Rosaniline Dyes; D012834:Silver / Q000627:therapeutic use; D013696:Temperature; D013997:Time Factors; D014025:Titanium / Q000737:chemistry / Q000627:therapeutic use; D019228:Tooth Crown / Q000473:pathology*; D019553:Tooth, Nonvital / Q000628:therapy*; D015036:Zinc Phosphate Cement / Q000737:chemistry
chemical_list: D004396:Coloring Agents; D003188:Composite Resins; D003738:Dental Cements; D017220:Dentin-Bonding Agents; D004853:Epoxy Resins; C101035:Flexi-Flow cement; D011109:Polymethacrylic Acids; C462240:RelyX ARC; D019279:Resin Cements; D012387:Root Canal Filling Materials; D012394:Rosaniline Dyes; C115612:single bond; D012834:Silver; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; C028044:epoxy resin AH-26; C025485:basic fuchsin; D015036:Zinc Phosphate Cement; C074226:Harvard Cement; D006171:Gutta-Percha; D014025:Titanium; D001729:Bismuth