In 1946 Kesling initially suggested the idea of transparent orthodontic equipment to straighten teeth. In 1998, Align Technology, Inc. introduced Invisalign®. The prevalence of clear aligners has significantly increased due to advancements in materials and computer-assisted orthodontic design. Numerous studies have proved the usefulness of clear aligners in correcting practically all malocclusions, from mild to severe, with great results.Aim of this research is to find and review the orthodontic literature evaluating the efficiency (treatment time, chair time), effectiveness (occlusal indices) and long-term stability of treatment with clear aligners as compared to traditional orthodontic therapy. After an initial screening phase 983 records were identified from the scientific databases, the potentially eligible 8 papers were qualitatively selected to evaluate the efficiency of clear aligners as compared to conventional orthodontic therapy.

Keywords: Invisalign, clear alogner, orthodontic treatment.