Three-dimensional analysis of the physiologic drift of adjacent teeth following maxillary first premolar extractions

Abstract

We assessed the three-dimensional (3D) pattern of the physiologic drift of the remaining adjacent teeth after premolar extraction due to orthodontic reasons and the associated factors. Data were collected from 45 patients aged 17.04 ± 5.14 years who were scheduled to receive a fixed appliance after maxillary premolar extraction. Seventy-five drift models were obtained and digitalized via 3D scanning. The average physiologic drift duration was 81.66 ± 70.03 days. Angular and linear changes in the first molars, second premolars, and canines were measured using the 3D method. All the examined teeth had tipped and moved towards the extraction space, leading to space decreases. Posterior teeth primarily exhibited significant mesial tipping and displacement, without rotation or vertical changes. All canine variables changed, including distal inward rotation and extrusion. The physiologic drift tended to slow over time. Age had a limited negative effect on the mesial drift of posterior teeth, whereas crowding had a limited positive effect on canine drift. Thus, the mesial drift of molars after premolar extraction may lead to molar anchorage loss, particularly among younger patients. The pattern of the physiologic drift of maxillary canines can help relieve crowding and facilitate labially ectopic canine alignment, whereas canine drift is accelerated by more severe crowding.

Morphometric analysis of the apical foramina in extracted human teeth

“…Changes in the apex's shape and location are possible under specific influences on the tooth include occlusion, adjacent drifting tooth, and pressure exerted by the tongue [23]. These subsequent changes lead to the changes in the alveolar bone around the tooth.…”

Influence of orthodontic treatment with premolar extraction on the spatial position of maxillary third molars in adult patients: a retrospective cohort cone-bean computed tomography study

“…However, the amount of mesial movement was smaller than the 2.2 mm mesialization of third molars previously reported [17]. The difference can be attributed to the lower potential of spontaneous tooth movement in adults [20] and relatively higher degree of anchorage.…”

Rehabilitation of Mastication and Lack of Space Treatment in Narrow Edentulous With Fixed-Fixed Bridge

“…When there is a missing tooth due to caries, periodontal disease, trauma, or tooth extraction, the balance is disturbed and the remaining teeth will spontaneously move to achieve a new balance causing the teeth to migrate to mesial or distal direction and extrusion of antagonistic tooth to the edentulous space. 4,9 Replacing missing teeth aims to maintain the integrity of the stomatognathic system to prevent function alteration due to tooth movement. In this case, the patient desired a rehabilitation for his teeth mastication function.…”