title: Effect of endodontic sealers on dowels luted with resin cement.
abstract: OBJECTIVE
  This study evaluated the retention of prefabricated parallel-sided dowels luted with resin cement in extracted teeth that were obturated with gutta percha using a eugenol sealer or a calcium hydroxide sealer.
  
  
  METHODS
  Extracted maxillary incisor roots (N = 51) were instrumented to simulate conventional root canal therapy and divided into 3 groups (n = 17). One group was not obturated. Second and third groups were obturated with gutta percha using a eugenol-containing or calcium hydroxide-containing sealer. Gutta percha was removed using a heated plugger, and dowel spaces were prepared to a 7 mm depth. Dowel space walls were acid etched and primed, and prefabricated stainless steel dowels were luted using resin cement. After 24 hours, the load required to dislodge each dowel along a path parallel to its long axis was measured and recorded. A one-way analysis of variance (alpha = 0.05) was performed to identify differences in the means among groups. The incidence of failure within the cement or at the dentin-cement interface was also recorded.
  
  
  RESULTS
  No statistically significant difference was found among the control (159.9 +/- 96.3 N), eugenol sealer (153.1 +/- 77.3 N), and calcium hydroxide sealer (192.0 +/- 89.3 N) groups. Nearly all specimens displayed adhesive failure at the dentin-resin cement interface.
  
  
  CONCLUSIONS
  Conventional endodontic obturation using a eugenol-containing or a calcium hydroxide-containing endodontic sealer did not affect retention of prefabricated stainless steel dowels luted with resin cement.
authors.affiliation: Department of Prosthodontics, Virginia Commonwealth University, School of Dentistry, Richmond, VA 23298-0566, USA. dburns@den.den.vcu.edu
authors.forename: D R
authors.initials: DR
authors.lastname: Burns
authors.forename: P C
authors.initials: PC
authors.lastname: Moon
authors.forename: N P
authors.initials: NP
authors.lastname: Webster
authors.forename: D A
authors.initials: DA
authors.lastname: Burns
mesh_terms: D000134:Acid Etching, Dental; D000704:Analysis of Variance; D002126:Calcium Hydroxide / Q000737:chemistry; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis / Q000295:instrumentation; D003781:Denture Retention; D006171:Gutta-Percha / Q000737:chemistry*; D006801:Humans; D010710:Phosphates / Q000737:chemistry; D011176:Post and Core Technique; D019279:Resin Cements / Q000737:chemistry*; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012390:Root Canal Therapy; D012459:Salicylates / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D015035:Zinc Oxide-Eugenol Cement / Q000737:chemistry
chemical_list: D003738:Dental Cements; C093719:Panavia TPN-S; D010710:Phosphates; D019279:Resin Cements; D012387:Root Canal Filling Materials; D012459:Salicylates; D015035:Zinc Oxide-Eugenol Cement; C055601:Sealapex; C095719:Roth's 811 sealer; D006171:Gutta-Percha; D002126:Calcium Hydroxide