Surface wear and adhesive failure of resin attachments used in clear aligner orthodontic treatment

• Published in: Journal of orofacial orthopedics 2024-05, Vol.85 (Suppl 1), p.52-62
• Main Authors: Fausto da Veiga Jardim, Alexandre, Curado de Freitas, Jairo, Estrela, Carlos
• Format: Article
• Language: English
• Subjects: Computer-Aided Design; Dentistry; Female; Humans; Imaging, Three-Dimensional; Male; Medicine; Oral and Maxillofacial Surgery; Original Article; Orthodontic Appliances, Removable; Surface Properties; Tooth Movement Techniques - instrumentation
• ISSN: 1434-5293; 1615-6714
• DOI: 10.1007/s00056-023-00471-5

Purpose This study evaluated adhesive and cohesive failures and the surface wear of attachments employed in clear aligner treatment (CAT) using three-dimensional (3D) superimposition. Methods In all, 3D models of 150 teeth were obtained from intraoral scans from patients undergoing CAT with at least 4 months between each scan. Of the initial sample, 25 teeth were discarded, and 125 teeth were included in the study. Superimpositions of each individual tooth at the first and second time points were made using computer-aided design (CAD) software (Meshmixer; Autodesk, Mill Valley, CA, USA). Analyses were performed to compare surface wear and failures related to type of attachment (optimized/conventional), dental group (molars/premolars/anterior teeth), and arch (mandibular/maxillary). Mann–Whitney and Kruskal–Wallis statistical tests were applied with significance set at 5%. Results More surface wear was observed in conventional attachments, mandibular and anterior teeth with statistical significance for surface wear on the distal surface of conventional attachments ( p