Objective: To compare the space closure, root resorption and canine angulation during en-masse retraction of the labial segment after extraction of first premolars with or without interseptal bone reduction distal to the maxillary canines.
Design: A single-centre, parallel randomised control trial included 16 participants with a mean age of 21.5 years. Participants were allocated into treatment groups using blocked randomisation, and blinding was employed for outcome assessors and data analysts.
Interventions: The control group consisted of eight participants who underwent therapeutic extraction of maxillary first premolars, while the experimental group included eight participants who underwent interseptal bone reduction immediately after premolar extraction. En-masse retraction was performed using conventional friction mechanics with absolute anchorage in both groups.
Outcomes: Measurements of space closure were conducted over 3 consecutive months during retraction. The time taken for total space closure was recorded. Cone-beam computed tomography scans were taken before and 3 months after retraction to assess root resorption and canine angulation.
Results: The experimental group demonstrated a significant increase in the rate of en-masse retraction compared to the control group over 3 months (mean difference [MD] = 1.09 mm, 95% confidence interval [CI] = 0.78-1.40), with an overall space closure rate of MD 0.26 mm/month (95% CI = 0.17-0.34). However, these changes were of minimal clinical significance. The change in canine angulation (MD = 4.50°, 95% CI = -1.61-10.61) did not exhibit statistical significance. Substantial root resorption was observed in six maxillary anterior teeth, with no difference between the groups.
Conclusion: Interseptal bone reduction is a minimally invasive surgical technique, resulting in a notably accelerated rate of en-masse retraction in the experimental group over 3 months. However, despite the statistical significance, the clinical impact on overall space closure was minimal, with a difference of only 0.26 mm/month observed between the groups. Interseptal bone reduction did not affect the change in canine angulation and root resorption.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1177/14653125241283053 | DOI Listing |
Phys Rev E
November 2024
Department of Mechanical and Process Engineering, ETH Zurich, CH-8092 Zurich, Switzerland.
Exact closure for hydrodynamic variables is rigorously derived from the linear Boltzmann kinetic equation. Our approach, based on spectral theory, structural properties of eigenvectors, and the theory of slow manifolds, allows us to define a unique, optimal reduction in phase space close to equilibrium. The hydrodynamically constrained system induces a modification of entropy that ensures pure dissipation on the hydrodynamic manifold, which is interpreted as a nonlocal variant of Korteweg's theory of viscosity-capillarity balance.
View Article and Find Full Text PDFJ Neurochem
January 2025
Associate Laboratory i4HB-Institute for Health and Bioeconomy, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Caparica, Portugal.
Neurotransmitter:sodium symporters (NSS) reuptake neurotransmitter molecules from the synaptic space through Na-coupled transport. They are thought to work via the alternating access mechanism, exploring multiple configurations dictated by the binding of substrates and ions. Much of the current knowledge about these transporters has been derived from examining the structure of the Leucine Transporter (LeuT), a bacterial counterpart to human NSSs.
View Article and Find Full Text PDFJ Geom Anal
June 2024
Department of Mathematical Sciences, 1 University of Arkansas, SCEN 326, Fayetteville, AR 72701 USA.
CR functions on an embedded quadric always extend holomorphically to where is the closure of the convex hull of the image of the Levi form. When is a closed polygonal cone, we show that the Bergman kernel on the interior of is a derivative of the Szegö kernel. Moreover, we develop the Hardy space theory which turns out to be particularly robust.
View Article and Find Full Text PDFEur J Orthod
December 2024
Department of Orthodontics, Centre for Craniofacial Development & Regeneration, Faculty of Dentistry, Oral & Craniofacial Sciences, King's College London, London, SE1 9RT, United Kingdom.
Background: Maxillary lateral incisor agenesis is often managed with orthodontic space closure and canine substitution. Anatomic gingival margin heights associated with the maxillary anterior teeth are considered important for achieving aesthetic excellence with space closure, but evidence relating to the perceptions of lay people is poor.
Objectives: This study investigated the influence of gingival margin height variation in the maxillary anterior teeth following orthodontic space closure and canine substitution in the absence of maxillary lateral incisor teeth on perceived aesthetics judged by a lay population.
Int Orthod
December 2024
Department of Surgical Sciences (DISC), Division of Prosthetic Dentistry, University of Genoa, Genoa, Italy.
Introduction: The aim of this systematic review was to determine the best treatment alternatives for patients with maxillary lateral incisor agenesis (MLIA) by comparing orthodontic space closure, implant and tooth supported dental prostheses by assessing studies that evaluated their periodontal, occlusal (function) and aesthetic results.
Methods: The present systematic review was reported according to the indications of the preferred reporting items for systematic reviews and meta-analysis (PRISMA) incorporating network meta-analysis, and the protocol was registered with PROSPERO (CRD42023487245). The PRISMA systematic search, without restriction on language or initial date, was carried out using electronic databases: MEDLINE (PubMed), Scopus and central register of controlled trials.
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!