Anchorage Loss Evaluation during Maxillary Molars Distalization Performed by Clear Aligners: A Retrospective Study on 3D Digital Casts

The purpose of the research was to analyze premolar and canine anchorage loss observed during maxillary molars distalization in subjects with Class II malocclusion treated clear aligners. A total 49 (27 females, 22 males, mean age 14.9 ± 6 years) derived from Department Orthodontics University Rome “Tor Vergata” were selected according following inclusion criteria: Caucasian ancestry, I or minor skeletal malocclusion, occlusal relationship, permanent dentition fully erupted second molars, good compliance Each patient underwent same non-extractive molar protocol no auxiliaries other than attachments elastics. Prior treatment (T1) at end first movement (T2), digital dental casts taken by using an iTero intraoral scanner. Linear measurements performed order evaluate level premolars canines. statistical comparison T2 T1 values obtained a paired t-test (p < 0.05). statistically significant (2.5 mm) observed; slight not assessed, while mesial upper canines (1.33 highlighted. Clear aligner effective obtaining movement. However, distalization, observed.