Objective: To evaluate Stage III of the Begg technique using finite element method and to locate the center of rotation (Crot) during torquing and uprighting of the central incisor. Materials and methods: The maxillary central incisor was subjected to a finite element study. Movement of the tooth along the z-axis (labiolingual) and X-axis (mesiodistal) was noted. The Crot was located by finding...

T impaction of lower third molars is a common clinical finding, with a prevalence between 9.5% and 39% among different populations.1 Previous studies have indicated that normal eruption of lower third molars may be facilitated by extraction of the premolars before orthodontic treatment.2 Nonextraction therapy has been associated with more “abnormal” eruption of lower third molars compared to ex...

INTRODUCTION The early orthodontic treatment allows correction of skeletal discrepancies by growth control, and the elimination of deleterious habits, which are risk factors for the development of malocclusions, favoring for the correction of tooth positioning later in a second treatment stage. During development of teeth and occlusion, the mandibular second molars commonly erupt in the oral ca...

INTRODUCTION The transpalatal arch (TPA) can be used as an adjunct during orthodontic treatment to help control the movement of the maxillary first molars in 3 dimensions, including producing molar rotation and uprighting, maintaining transverse dimensions posteriorly during treatment, and maintaining leeway spaces during the transition of the dentition. The purpose of this retrospective cephal...

The purpose of this study was to analyse the effect of premolar extraction therapy on third molar angulation during active treatment, and to test the significance of such changes on subsequent impaction of the third molars. Lateral cephalograms made before (T1) and after (T2) treatment and at long-term follow-up (T3) of 157 patients treated non-extraction (non-ex) or with extraction of four pre...

BACKGROUND The traditional Herbst appliance induces mandibular incisor proclination independent of the anchorage system used. The dental effects of the Herbst appliance as an element of a completely customized lingual orthodontic (LO) appliance (Incognito, 3 M) has not been analyzed yet and the aim of this paper was to measure the effect of mandibular incisor proclination using this Herbst-LO d...