title: Effect of three root canal sealers on the retentive strength of endodontic posts luted with a resin cement.
abstract: OBJECTIVE
  This investigation examined what effect three different sealers had on retention of endodontic posts (Parapost) luted with a resin cement (Panavia 21 OP).
  
  
  METHODS
  Sixty-four single-rooted teeth were decoronated, filed, cleaned, and shaped with a size 5 Gates-Glidden drill and 0.12 taper G.T. rotary instrumentation (Dentsply/Tulsa Dental). Teeth were then divided into four groups of 16 each. Group 1 was not obturated, and served as a control. The other three groups were obturated with gutta-percha using a different sealer for each group. Group 2 used a eugenol containing sealer (Kerr Pulp Canal Sealer), group 3 a resin sealer (AH-26), and group 4 a calcium hydroxide sealer (Sealapex). After 1 week's storage at 100% humidity, 10-mm deep post spaces were prepared with a size 6 Gates-Glidden drill, and size 5 Paraposts were cemented. Following 48 h of storage, samples were mounted in a PVC pipe with acrylic, and the posts were removed vertically using a universal testing machine at 1 mm min-, with data recorded in kilograms.
  
  
  RESULTS
  The mean values of force required to remove the posts were: group 1 = 61.80, SD = 16.21; group 2 = 43.14, SD = 14.66; group 3 = 48.54, SD = 17.84; group 4 = 53.52, SD = 18.77. Using anova and Bonferroni tests, group 1 demonstrated significantly greater mean retention strength values than group 2, but no other significant differences existed between groups.
  
  
  CONCLUSIONS
  The chemical formulation of root canal sealers did not significantly affect the retention of endodontic posts luted with resin cement.
authors.affiliation: Department of Restorative Dentistry, University of the Pacific, San Francisco, California 94115, USA. mhagge@sf.uop.edu
authors.forename: M S
authors.initials: MS
authors.lastname: Hagge
authors.forename: R D M
authors.initials: RD
authors.lastname: Wong
authors.forename: J S
authors.initials: JS
authors.lastname: Lindemuth
mesh_terms: D000704:Analysis of Variance; D001729:Bismuth / Q000737:chemistry; D002126:Calcium Hydroxide / Q000737:chemistry; D001840:Dental Bonding; D017268:Dental Prosthesis Retention; D003799:Dental Stress Analysis / Q000295:instrumentation; D017220:Dentin-Bonding Agents / Q000737:chemistry; D004338:Drug Combinations; D004853:Epoxy Resins / Q000737:chemistry; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D006813:Humidity; D008422:Materials Testing; D010710:Phosphates / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry*; D012387:Root Canal Filling Materials / Q000737:chemistry*; D018915:Root Canal Preparation / Q000295:instrumentation; D012459:Salicylates / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D013223:Statistics as Topic; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D014025:Titanium / Q000737:chemistry; D015035:Zinc Oxide-Eugenol Cement / Q000737:chemistry
chemical_list: D017220:Dentin-Bonding Agents; D004338:Drug Combinations; D004853:Epoxy Resins; C093719:Panavia TPN-S; D010710:Phosphates; D019279:Resin Cements; D012387:Root Canal Filling Materials; D012459:Salicylates; D015035:Zinc Oxide-Eugenol Cement; C055601:Sealapex; D012834:Silver; C028044:epoxy resin AH-26; C076543:Kerr Pulp Canal Sealer; D006171:Gutta-Percha; D014025:Titanium; D002126:Calcium Hydroxide; D001729:Bismuth