Introducing nickel-titanium rotary instrumentation in a public dental service: the long-term effect on root filling quality

Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2011 Dec;112(6):814-9. doi: 10.1016/j.tripleo.2011.06.015. Epub 2011 Sep 9.


Objective: The aim of this study was to study the long-term effect on root filling quality after the introduction of nickel titanium rotary instrumentation (NTRI) within a public dental health organization.

Study design: After an education package, including hands-on training and/or lectures, the root filling quality was evaluated at the organizational level. All general dental practitioners (GDPs) employed at primary evaluation (n = 120) and after 4 years (n = 174) were included.

Results: The improved root filling quality had been maintained 4 years later. The frequency of excellent root fillings was slightly higher at the long-term follow-up (52%) compared with the short-term follow-up (45%; P = .038). A nonsignificant decrease in very poor-quality root fillings was registered.

Conclusions: A technology shift among GDPs to NTRI will increase the rate of good-quality root fillings. However, the shift per se will not eliminate the problem of substandard clinical performance.

Publication types

  • Comparative Study

MeSH terms

  • Clinical Competence / standards
  • Dental Alloys / chemistry*
  • Dental Health Services / standards*
  • Dental Pulp Cavity / diagnostic imaging
  • Endodontics / education
  • Equipment Design
  • Female
  • Follow-Up Studies
  • General Practice, Dental / education
  • Humans
  • Image Processing, Computer-Assisted / methods
  • Longitudinal Studies
  • Male
  • Nickel / chemistry*
  • Public Health Dentistry
  • Radiography
  • Root Canal Obturation / standards*
  • Root Canal Preparation / instrumentation*
  • Sweden
  • Teaching / methods
  • Titanium / chemistry*
  • Tooth Apex / diagnostic imaging
  • Treatment Outcome


  • Dental Alloys
  • titanium nickelide
  • Nickel
  • Titanium