ABSTRACT
This study evaluated fracture torque by torsion, in relation to the length and diameter of orthodontic mini-implants, to demonstrate their viability for clinical and experimental use based on the torque recommended by the manufacturers. The fractures at the moment of insertion, whose incidence in the literature is around 4 percent, are principally due to excessive force and the inability of the implant to resist rotational forces. Thirty orthodontic mini-implants of three commercial brands available in Brazil (Neodent 1.6 x 9 mm, Dentoflex 1.6 x 9 mm and Kopp 1.6 x 9 mm) were attached to a device made specifically for this research, leaving the mini-implants with sufficient stability. The miniimplants were submitted to torsion torque, using a digital torque wrench, until their breaking point. The values obtained with the test were submitted to analysis of variance and the Tukey test. The mean values of mini-implant ruptures were 26 N.cm for group A (Dentoflex), 25.4 N. cm for group B (Kopp) and 32.8 N.cm for group C (Neodent). From the Tukey test we could observe that the relationships between the means of the Dentoflex and Neodent groups, and between the Kopp and Neodent groups, were significant. Between the Dentoflex and Kopp groups, significance was nonexistent. All the values found in our research for fracture torque were higher than the limits recommended by the manufacturers for clinical use in orthodontics. The highest values were found in the Neodent group.
Subject(s)
Dental Implants , Orthodontic Anchorage Procedures/instrumentation , Torque , Titanium/chemistry , Analysis of Variance , Bone Screws , Dental Stress Analysis , Materials Testing , Orthodontic Appliance Design , Orthodontic Anchorage Procedures/methods , Stress, MechanicalABSTRACT
Tórus são lesões não patológicas que acometem ossos maxilares. Sua remoção cirúrgica é indicada quando este se torna ulcerado por traumatismos locais insidiosos ou quando se configura um problema durante as reabilitações protéticas. Realizamos, neste estudo, uma avaliação comparativa entre duas técnicas cirúrgicas empregadas para remoção do tórus mandibulares com finalidade protética...
Tori are non pathological lesions that involve maxilary bones. Their surgical removal is indicated when this became ulcerated by insidious local trauma or when there is a problem during prosthetic rehabiblitation. The main goal of this study was to evaluate two different surgical technique applied to remove the mandibular...