Effectiveness of Clear Aligner Thickness and Attachment Design in the Intrusion of Posterior Teeth: Finite Element Analysis

Aligner thickness and attachment design significantly influenced posterior intrusion biomechanics. The combination of 1.15 mm aligner thickness with OHA represents the optimal configuration for posterior intrusion. Attachment geometry plays a critical role in force distribution, with bevelled designs providing enhanced effectiveness. These findings establish evidence-based guidelines for future clinical clear aligner applications in posterior intrusion cases.