Dimensional behaviors of direct-printed versus thermoformed clear retainers in relation to changes of inter-piece occlusal contact distribution measured by T-scan after intraoral aging: a prospective clinical study

Within clinically acceptable ranges of gap discrepancy, the DPRs exhibited site-specific dimensional behavior after intraoral use representing enhanced retainer fit in the posterior teeth and worsened fit in the anterior teeth, in relation to the initial OCA, in contrast with the TFRs showing overall gap increases with higher susceptibility to patient's occlusal and skeletal patterns.