Interventions for treating traumatised ankylosed permanent front teeth

  • Review
  • Intervention




Teeth that have suffered trauma can fuse to the surrounding bone - the process referred to as dental ankylosis. Ankylosed permanent front teeth fail to erupt during facial growth and can become displaced, thus resulting in functional and aesthetic problems. Dental ankylosis is also associated with root resorption, which eventually leads to the loss of affected teeth. Different interventions for the management of ankylosed permanent front teeth have been described but it is unclear which are the most effective.


To assess the effects of treatment options for ankylosed permanent front teeth.

Search methods

The following electronic databases were searched: the Cochrane Oral Health Group Trials Register (to 3 August 2015), the Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library, 2015, Issue 7), MEDLINE via OVID (1946 to 3 August 2015), EMBASE via OVID (1980 to 3 August 2015) and LILACS via BIREME (1982 to 3 August 2015). We searched the US National Institutes of Health Trials Register ( and the WHO Clinical Trials Registry Platform for ongoing trials. No restrictions were placed on the language or date of publication when searching the electronic databases.

Selection criteria

Randomised controlled trials (RCTs) comparing any intervention for treating displaced ankylosed permanent front teeth in individuals of any age.

Data collection and analysis

Two independent review authors screened studies in duplicate. Although no study was included, the authors had planned to extract data independently and to assess risk of bias following the Cochrane Collaboration methods.

Main results

The search retrieved 77 references to studies. None matched the inclusion criteria and therefore were excluded.

Authors' conclusions

There is no evidence from RCTs about the comparative effectiveness of the different treatment options for ankylosed permanent front teeth. The lack of high level evidence for the management of this health problem emphasises the need for well designed clinical trials.

Plain language summary

Interventions for treating traumatised permanent front teeth that are fused to bone

Sometimes teeth can fuse to the bone of the jaws after trauma, an abnormal healing process called ankylosis. Usually the roots of ankylosed teeth are resorbed and replaced by the surrounding bone; in some individuals, root resorption can lead to the loss of ankylosed teeth. Ankylosed teeth also fail to accompany the normal growth of the jawbones and thus can become gradually displaced if the trauma occurs during childhood.

This review found that there is currently insufficient high level evidence for comparing the effectiveness of different treatment methods for ankylosed front teeth. The authors suggest that further research should aim to provide evidence for the decision about which method is more effective and safer and that future randomised clinical trials designed according to the Consolidated Standards of Reporting Trials (CONSORT) Statement ( may provide useful answers.