Abstract
The retrospective study assessed outcomes of orthodontic treatment using fixed appliance and clear plastic aligner with PAR index, and compared effectiveness of the therapy with TEI (treatment efficiency index). Another aim was to compare the number of occlusal contacts and assess root parallelism in orthopantomogram.
Material: The sample included 80 patients - 40 treated with fixed appliance, 40 with Invisalign. Method: PAR (Peer Assessment Rating) index was measured in all patients prior and after treatment in digital dental casts; the number of occlusal contacts was measured in occlusogram.
Root parallelism was measured in OPG made prior and after the treatment. Conclusion: Results for both groups were acceptable.
However, better quality results were achieved in the group treated with conventional fixed appliances. The length of treatment was shorter in the group treated with Invisalign.
The number of occlusal contacts after the treatment was higher in patients treated with fixed appliance. Better toot parallelism was found in patients with fixed appliance, the only exception being lower anterior segment where the results were similar in both groups.