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OBJECTIVES Since the low friction of NiTi wires allows a rapid and efficient orthodontic tooth movement, the aim of this research was to investigate the friction and surface roughness of different commercially available superelastic NiTi wires before and after clinical use. The surface of all of the wires had been pre-treated by the manufacturer. (More)
AIM The aim of this investigation was to employ a new in-vitro testing system for manual toothbrushes in order to distinguish the more effective from those less so for dental care during fixed appliance treatment. MATERIALS AND METHODS The testing apparatus consisted of a sliding carriage able to execute a horizontal brushing movement, and a row of(More)
In this study 95 patients with a malocclusion type Angle class II were treated with a bite jumping appliance and the results achieved were compared with untreated class II patients. A clear improvement in the skeletal and dental relationships was observed. Significant changes were achieved yearly in the following: 1. the angle SNA was reduced (0.82(More)
OBJECTIVE The aim of this study is to relieve scientists from the complex and time-consuming task of model generation by providing a model of a canine tooth and its periradicular tissues for Finite Element Method (FEM) simulations. METHODS This was achieved with diverse commercial software, based on a micro-computed tomography of the specimen. RESULTS(More)
An ultrastructural study of the cementum and periodontal ligament (PDL) changes after continuous intrusion with two different and controlled forces in humans was carried out. Twelve first upper premolars, at stage 10 of Nolla, orthodontically indicated for extraction from six patients (mean age 15.3) were used. They were divided into three experimental(More)
BACKGROUND Canines or premolars must often be derotated during fixed appliance therapy. If such derotation is carried out on the continuous archwire during the leveling phase, it may lead to unwanted side effects on the neighboring teeth. MATERIAL AND METHODS At the University of Ulm a .018" x .018" nickel-titanium segmental derotation archwire was(More)
MATERIAL AND METHOD With the purpose of investigating the occurrence, localization and extension of possible root resorptions after fixed appliance treatment with a continuous torque force, 28 upper first premolars orthodontically indicated for extraction from 14 patients were analyzed by scanning electron microscopy. Tooth movement was carried out with(More)
OBJECTIVE To evaluate the risk of root resorption, individual finite element models (FEMs) of extracted human maxillary first premolars were created, and the distribution of the hydrostatic pressure in the periodontal ligament (PDL) of these models was simulated. MATERIALS AND METHODS A continuous lingual torque of 3 Nmm and 6 Nmm respectively was applied(More)
The paper demonstrates how to generate an individual 3D volume model of a human single-rooted tooth using an automatic workflow. It can be implemented into finite element simulation. In several computational steps, computed tomography data of patients are used to obtain the global coordinates of the tooth's surface. First, the large number of geometric data(More)