Journal Article

Evaluation of treatment and post-treatment changes by the PAR Index

Kari Birkeland, Jakob Furevik, Olav Egil Bøe and Per Johan Wisth

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 19, issue 3, pages 279-288
Published in print June 1997 | ISSN: 0141-5387
Published online June 1997 | e-ISSN: 1460-2210 | DOI:
Evaluation of treatment and post-treatment changes by the PAR Index

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To assess the outcome of orthodontic treatment, 224 cases treated in a postgraduate clinic were evaluated. Pre-treatment (T1), post-treatment (T2) and 5-year follow-up (T3) study casts were assessed by the Peer Assessment Rating (PAR) Index. The influence of various factors upon treatment and long-term outcome was analysed. According to the PAR Index, orthodontic treatment reduced the malocclusions on average by 76.7 per cent, and at follow-up the reduction was 63.8 per cent. Follow-up stability was good for 76.3 per cent of the cases. Some cases (4.0 per cent) even improved, while moderate to severe post-treatment relapse occurred in 19.7 per cent of the cases. Orthodontic treatment changed Angle Class I, II and III malocclusions to near ideal occlusion (PAR scores 4.4-6.8). No long-term interaction between the groups was discovered. Sex and extraction/non-extraction treatments did not significantly affect the results. The initial PAR score accounted for 77.8 per cent of the variation in treatment PAR score change (T1−T2), and for 61.8 per cent of the variation of long-term PAR score change (T1−T3). Age at treatment start accounted significantly for the variability of treatment changes (P < 0.001). The PAR score at the end of treatment had some explanatory importance (R2 = 0.099) for the long-term (T1−T3) result. However, PAR score changes in the follow-up period were difficult to predict.

Journal Article.  0 words. 

Subjects: Restorative Dentistry and Orthodontics

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