The Norwegian JIA Study (NorJIA):

NorJIA is a prospective, multicenter, observational study of 228 children with juvenile idiopathic arthritis (JIA) and 224 controls attending the university clinics in Bergen, Tromsø and Trondheim. The study will run over 5 years, and include extensive clinical, laboratory, radiological and oral examinations at baseline and after 2 years’ follow-up. There will be a special focus on the temporomandibular joints (TMJs) with extensive imaging (MRI 3Tesla, ultrasound, OPG, CEPH, Bitewings and CBCT (small field of view (FOV) for TMJs)) and clinical TMJ examination, aiming at establishing scoring systems for active and chronic disease. The study is registered on https://clinicaltrials.gov/ with identifier: NCT03904459.


Acta Odontologica Scandinavica (2022) - Gil

Our results highlight the importance of increased awareness of oral health care in patients with JIA and that surface- and site-specific differences in periodontal outcomes exist between individuals with JIA and controls. Few JIA disease-specific variables associated with plaque or gingival bleeding...

Doctorial thesis - Oskar Angenete

Title: Imaging of the temporomandibular joint in children with juvenile idiopathic arthritis; references and novel scoring systems for active and permanent disease. 

May 3rd 2022 NTNU

BMC Oral Health - Gil


No overall difference in caries prevalence between individuals with JIA and controls was observed, but for both groups, low maternal educational level and tooth surface associated with presence of caries...


Doctorial thesis Veronika Gjertsen Rypdal

Second thesis from the NorJIA Study

21 Mai 2021

Dagens Medisin - Paula Frid

Research: Single corticosteroid injections in adolescents with JIA and TMJ arthritis may be efficient as a supplement to systemic treatment...

30 Nov 2020

Frontiers - Paula Frid

Research: Microbiota associated with chronic inflammation in saliva is more common in JIA compared to healthy children and some of these bacteria were associated with increased disease activity in JIA...

4 Nov 2020

Dagens Medisin - Veronika Rypdal

Research: One of 5 children with JIA also get uveitis...

15 Oct 2020

BMC Oral Health - Fischer

Research: Symptoms and clinical signs of TMD were seen in approximately half of the JIA patients compared to about one fourth of their healthy peers...

13 Oct 2020

Doctorial thesis Paula Frid

First thesis from the NorJIA study

2 Oct 2020

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