The evolution of upper arch distalization systems: a systematic review

II Class malocclusions may be skeletal or dentoalveolar and are considered for treatment high priority. They cannot always be solved with an extractive therapy and the arch space must be created or modified with orthodontic devices. Distalization of the upper arch is a technique to gain space that can help to solve a II Class malocclusion from maxillary overshoot or dental mass in the upper arch. This study aims to analyze the current knowledge in the literature on the treatment of II classes by distalization of the upper arch, to clarify which is the most effective method and therapy for the resolution of the orthodontic case, when it is not possible or desirable to recover space exclusively with the help of extractive therapy.