Occlusal contact changes in patients treated with clear aligners: A retrospective evaluation using digital dental models.

Introduction: This study used digital intraoral scans to evaluate how clear aligner treatment affects occlusal contacts and to determine the influence of sex and age on contact changes. Results were compared with contact changes that occur during fixed appliance therapy.

Methods: Patients included in this study were treated in a University setting and private practice.

Association between crowding estimation and extraction recommendations in orthodontics.

Introduction: Little is known about how precisely orthodontists in the United States (US) assess crowding or at what range of crowding they recommend extraction. This study aimed to assess the relationship between estimated crowding in patients with a Class I relationship and extraction recommendation by orthodontists in the US. The secondary aims were to evaluate the accuracy and precision of clinician estimations and determine if clinician background traits play a role in extraction decision-making.