Abstract
ObjectivesIndividual orthodontic treatment duration is hard to predict. Individual biological factors are amongst factors influencing individual rate of orthodontically induced tooth movement (OTM). The study aim is to determine the rate of OTM by a novel 3D method and investigate parameters that may predict the rate of tooth movement.Materials and methodsIn this prospective cohort study, rate of OTM was determined from 90 three-dimensional intra-oral scans in 15 patients (aged 12–15) undergoing orthodontic treatment. For each patient, intra-oral scans were taken every week for up to 6 weeks (T0–T5). The teeth were segmented from the scans and the scans were superimposed on the palatal rugae. The rate of OTM was calculated for each tooth. Other parameters were gingival inflammation, contact-point displacement and the biological markers, matrix metalloproteinases (MMP), MMP-9 and MMP-2 in gingival crevicular fluid (GCF).ResultsOur study showed a high variation in the rate of OTM, varying from 0.15 to 1.24 mm/week. Teeth in the anterior segment tended to move more compared with the posterior segment. The contact point displacement and gingival inflammation varied greatly amongst the patients. The MMPs measured did not correlate with tooth movement. However, the gingival inflammation index showed a significant correlation with OTM. Future studies should include other biological markers related to bone-remodeling.ConclusionThis novel and efficient 3D method is suitable for measuring OTM and showed large individual variation in rate of OTM.Clinical relevancePatients show different rates of OTM. The rate of OTM in an individual patient can provide guidance in timing of follow-up appointments.
Highlights
Improvement of dental function and aesthetics with orthodontic treatment is becoming increasingly popular
Our study shows that the rate of orthodontically induced tooth movement (OTM) for the first week predicts that of 6 weeks really well, thereby making possible longitudinal studies easier to accomplish
A novel 3D method was used to correlate the rate of OTM to other parameters
Summary
Improvement of dental function and aesthetics with orthodontic treatment is becoming increasingly popular. In 2011, 60% of all Dutch young adults between 17 and 23 years old had orthodontic treatment during their adolescence [1]. 2 3D Lab, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands undergoing orthodontic treatment, the treatment duration is a major drawback [2]. The individual treatment duration is still hard to predict. Treatment duration is influenced by several factors of which individual rate of orthodontically induced tooth movement (OTM) probably plays an important role. It is shown that individual rate of OTM is highly variable [4, 5]. Clinical studies show OTM rates between 0.55 and 2.44 mm per month when using full fixed appliances and NiTi wires for initial alignment [6]
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call