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The effect of root canal preparation on microleakage within endodontically treated teeth: an in vitro study.

AbstractAIM:
The purpose of this study was to evaluate the effects of smear layer and canal instrumentation on leakage in root-filled teeth.
METHODOLOGY:
Six groups (n = 12) of freshly extracted human canines and premolars with closed apices and single roots were used. Groups A, B, C, and D were instrumented with engine-driven rotary nickel-titanium MCXIM files and Groups E and F were instrumented with conventional stainless steel hand files. Groups A, C, and E were flushed with 3.0 mL of 17.0% REDTA to remove the smear layer prior to obturation. All teeth were flushed with 5.25% NaOCl, then obturated with AH-26 sealer and either the lateral condensation (Groups C-E) or thermomechanical compaction technique (Groups A and B). Copper wire was placed coronally in contact with the gutta-percha in each tooth and, after immersion in 0.9% NaCl solution, a 10 volt dc voltage was connected between each tooth and a stainless steel electrode. The current flow in the circuit was observed for 45 days. One way ANOVA and Duncan's Multiple Range Test were used to compare Groups A-F at time intervals of 10, 20, 30 and 45 days and identify statistically significant differences.
RESULTS:
Significantly less microleakage occurred when the smear layer was removed and when the canals were obturated with thermoplasticized gutta-percha. Canals instrumented with engine-driven NiTi files exhibited less leakage than hand-instrumented canals irrespective of obturation method.
CONCLUSIONS:
Smear layer removal is beneficial to root canal sealing. Obturation with thermoplasticized gutta-percha provides a superior seal whilst canal instrumentation with engine-driven NiTi files reduces the extent of microleakage in root canals.
AuthorsJ A von Fraunhofer, D K Fagundes, N J McDonald, T C Dumsha
JournalInternational endodontic journal (Int Endod J) Vol. 33 Issue 4 Pg. 355-60 (Jul 2000) ISSN: 0143-2885 [Print] England
PMID11307211 (Publication Type: Comparative Study, Journal Article)
Chemical References
  • Cetrimonium Compounds
  • Chelating Agents
  • Dental Alloys
  • Disinfectants
  • Drug Combinations
  • Epoxy Resins
  • Root Canal Filling Materials
  • Root Canal Irrigants
  • titanium nickelide
  • Stainless Steel
  • Silver
  • epoxy resin AH-26
  • REDTA
  • Nickel
  • Gutta-Percha
  • Edetic Acid
  • Titanium
  • Sodium Hypochlorite
  • Methenamine
  • Bismuth
Topics
  • Analysis of Variance
  • Bicuspid
  • Bismuth (therapeutic use)
  • Cetrimonium Compounds (therapeutic use)
  • Chelating Agents (therapeutic use)
  • Cuspid
  • Dental Alloys
  • Dental Leakage (classification)
  • Disinfectants (therapeutic use)
  • Drug Combinations
  • Edetic Acid (therapeutic use)
  • Electrochemistry
  • Epoxy Resins
  • Equipment Design
  • Gutta-Percha (therapeutic use)
  • Humans
  • Methenamine (therapeutic use)
  • Nickel
  • Root Canal Filling Materials (therapeutic use)
  • Root Canal Irrigants (therapeutic use)
  • Root Canal Obturation
  • Root Canal Preparation (instrumentation, methods)
  • Root Canal Therapy
  • Silver (therapeutic use)
  • Smear Layer
  • Sodium Hypochlorite (therapeutic use)
  • Stainless Steel
  • Statistics as Topic
  • Titanium (therapeutic use)

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