Contact person:
Annika Björkner
  • OFRS
Responsible at MaU:
Annika Björkner
Project members at MaU:
Collaborators :
  • Fernando Mota de Almeida - Folktandvården Region Norrbotten
  • Public dental organisations in:
  • Region Blekinge
  • Region Gävleborg
  • Region Halland
  • Region Kalmar
  • Region Kronoberg
  • Region Norrbotten
  • Smile Tandvård
  • Oris Dental
  • Aragón Dental
  • Kungsbrotandläkarna
  • Oscarsson Dental
Time frame:
01 January 2019 - 01 January 2027
Research subject:
  • Dentistry
  • Endodontics
  • Clinical research
  • Toot survival
  • Quality of root canal treatment
  • General dentistry
  • Health economy
  • The digital research process

Project description

Approximately 205,000 root canal treatments are performed annually in Sweden, mostly by general dentists. Available scientific evidence shows that one- or two-stage treatments have an equally good effect when the treatment is performed by a specialist in endodontics. Whether this also applies in general dental care is currently unknown.


To compare the outcome of one- and two-stage root canal treatment of necrotic teeth in general dentistry, one and 4 years after treatment.

Outcome Measures are: frequency of apical periodontitis and tooth survival. To compare root filling quality, incidence of complications and health economic outcome in one- and two-stage root canal treatment.


To study the outcome of one versus two visit treatments of necrotic teeth performed by general dentists one and four years after root canal treatment, respectively. Intended outcome measures are frequency of apical periodontitis and tooth survival.

To study and compare the root canal quality of one versus two visit treatments. To study the rate of complications after one versus two visit treatments.


Approximately 205,000 endodontic treatments are performed per year in Sweden. Currently, there is uncertainty as to whether the treatment of teeth with apical periodontitis can be successfully treated during a single visit. This study puts a particular focus on the often debated question of whether root canal treatments performed by general dentists in one or two visits affect the outcome of the treatment and the possible consequences of these two different treatment protocols. Whether one or two visit treatments have a better effect on treatment results is currently uncertain, as are the health-economic consequences for society.


This is a clinical prospective randomized multicenter study. The clinical study is ongoing and started in 2022. Clinics are welcome to participate in our study. Just contact us!

Why is this important?

An optimally performed root canal should lead to improved oral health and at the same time be carried out cost-effectively. Economic evaluations of the interventions are limited and we currently lack suitable measures for improving health. If a single visit is as effective and reliable as a two-visit treatment, more treatments can be carried out to a greater extent, saving time and money for the patients and dental care in the region. For the clinic, among other things, material consumption and administration are reduced, the finances are improved. The patient, in turn, avoids extra costs for travel, loss of income etc.