PAR evaluation of orthodontic treatment outcomes of Class I malocclusion cases treated with extraction

Karina Maria Salvatore de FREITAS, Marcos Roberto de FREITAS, Guilherme JANSON, José Fernando Castanha HENRIQUES, Arnaldo PINZAN

Introduction: a trustworthy evaluation of orthodontic treatment outcomes without using an occlusal index becomes difficult. The PAR index is capable of objectively assess treatment changes and the real improvement. Objective: due to this, it was decided to evaluate orthodontic treatment changes with fixed appliances, Edgewise mechanics and four premolars extractions, as well as the quality of finishing occlusion, using the PAR index. Material and methods: study casts of 94 white patients (50 males and 44 females) were evaluated. The mean pre-treatment age was 13.46 years and the mean treatment time was 2.09 years. The PAR index was obtained from pre-treatment and post-treatment study casts of each patient. Results: after the accomplishment of statistical analysis, it could be observed that the mean initial PAR index of 29.46 was reduced to 6.32 at post-treatment stage, achieving a reduction of 78.54% with treatment. There was correlation between the initial PAR index and correction during treatment. Conclusion: it could be concluded that the treated cases presented a high standard orthodontic finishing, and the more severe the malocclusion, the more will be the treatment changes.

Keywords: Orthodontic treatment outcomes. Occlusal index. Corrective orthodontics.

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