This prospective clinical study evaluated the incidence of composite attachment loss in patients undergoing clear aligner treatment and identified patient-, tooth-, and treatment-related factors associated with attachment debonding. Twenty-one patients were followed for six months, and attachment failures were recorded at routine visits. Outcomes were compared according to attachment type (conventional vs. optimized), attachment size, tooth type, dental arch, and patient-related factors.

Composite attachments are integral to clear aligner therapy for improving force delivery, retention, and control of complex tooth movements. Despite their biomechanical importance, attachment loss remains a common clinical challenge and may compromise treatment efficiency and predictability. In this prospective study, attachments were bonded following the manufacturer's protocol using a high-viscosity composite. Patients were followed for six months, and attachment failures were documented with respect to type, size, tooth position, and patient-related behaviors. The primary objective was to determine the incidence of attachment loss and to identify factors associated with debonding, thereby contributing to clinical strategies that may reduce attachment failure and enhance treatment outcomes.

Inclusion Criteria:

Permanent dentition. Mild to moderate crowding. No history of previous orthodontic treatment with fixed appliances or clear aligners

Exclusion Criteria:

Poor oral health. Bruxism. Crown restorations. Dental fluorosis. Enamel hypoplasia or other structural abnormalities affecting attachment bonding