HOMEPRODUCTSCOMPANYCONTACTFAQResearchDictionaryPharmaSign Up FREE or Login

Smear layer production of K3 and ProFile Ni-Ti rotary instruments in curved root canals: a comparative SEM study.

AbstractOBJECTIVE:
The aim of this scanning electron microscopic study was to compare the quality and amounts of smear layer generated by 2 brands of nickel-titanium rotary instruments during canal preparation in the apical thirds of curved root canals.
STUDY DESIGN:
Forty mandibular mesial root canals with intact apex and mean curvature between 30 and 35 degrees were selected for this study. The root canals were randomly divided into 2 instrumentation groups of 15 each. Automated preparation was performed with ProFile (Dentsply Maillefer, Ballaigues, Switzerland; n = 15) and K3 (SybronEndo, Orange, Calif; n = 15) instrumentss using a crown-down technique. As a control group, barbed broaches (Mani; Matsutani Seisakusho, Takanezawa-Machi Tochibi-Ken, Japan; n = 10) were used to extirpate the necrotic pulp tissue from the root canals. All root canals were prepared to size #35. Glyde (File Prep, Dentsply Maillefer) was used as lubricant and 1% sodium hypochlorite solution as irrigant. At the conclusion of the experiments, all roots were split longitudinally and the root canal walls were examined at the apical third from 2 different perspectives using a scanning electron microscope. A 4-category scoring system for assessing the smear layer accumulation was used, and the resulting scores were statistically analyzed.
RESULTS:
Less smear layer was obtained in the K3 group at the selected apical third of curved root canals (P < .05). However, all instruments left a smear layer. The surface texture of the smear layer, in addition to the depth and the frequency of packed materials into the dentinal tubules, varied with instrument type.
CONCLUSIONS:
This finding may imply that, compared to ProFile, compression of the remaining smear layer is minimized when using the K3 rotary nickel-titanium system.
AuthorsKee-Yeon Kum, Reza B Kazemi, Bruce Y Cha, Qiang Zhu
JournalOral surgery, oral medicine, oral pathology, oral radiology, and endodontics (Oral Surg Oral Med Oral Pathol Oral Radiol Endod) Vol. 101 Issue 4 Pg. 536-41 (Apr 2006) ISSN: 1528-395X [Electronic] United States
PMID16545720 (Publication Type: Comparative Study, Evaluation Study, Journal Article)
Chemical References
  • Dental Alloys
  • titanium nickelide
  • Nickel
  • Titanium
Topics
  • Dental Alloys
  • Dental Instruments
  • Dental Pulp Cavity (anatomy & histology, ultrastructure)
  • Dentin (ultrastructure)
  • Equipment Design
  • Humans
  • Microscopy, Electron, Scanning
  • Molar
  • Nickel
  • Root Canal Preparation (instrumentation)
  • Smear Layer
  • Statistics, Nonparametric
  • Titanium

Join CureHunter, for free Research Interface BASIC access!

Take advantage of free CureHunter research engine access to explore the best drug and treatment options for any disease. Find out why thousands of doctors, pharma researchers and patient activists around the world use CureHunter every day.
Realize the full power of the drug-disease research graph!


Choose Username:
Email:
Password:
Verify Password:
Enter Code Shown: