The purpose of this study was to demonstrate the advantage of the finite helical axis (FHA) system in the biomechanical analysis of orthodontic tooth movement by comparing it with the rectangular coordinate (XYZ) system. Ten patients (6 females and 4 males, mean age 23 years 7 months) were selected. Maxillary canine retraction using light continuous forces of two different magnitudes (0.5 and 1...

OBJECTIVE To evaluate and compare the effects of two appliances on the en masse retraction of the anterior teeth anchored by temporary skeletal anchorage devices (TSADs). METHODS The sample comprised 46 nongrowing hyperdivergent adult patients who planned to undergo upper first premolar extraction using lingual retractors. They were divided into three groups, based on the lingual appliance us...

The aim of this clinical study is to assess the effectiveness of a new technique of rapid canine retraction through distraction osteogenesis. The effects of dentoalveolar distraction on the dentofacial structures, the dental changes that has been produced by dentoalveolar distraction and the vitality of the distracted canine immediately after distraction and 3 months postdistraction using pulp ...

The purpose of this study was to measure the efficacy of anchorage control between differential moments mechanics and temporary anchorage devices in a clinical trial. Forty-six patients requiring extraction of maxillary first premolars were allocated into 2 treatment groups. The differential moments group (G1) received a nickel titanium (NiTi) intrusion arch and a 150g NiTi closing coil spring ...

AIMS This study investigated the effect of an 810 nm gallium-aluminum-arsenide (Ga-Al-As) laser on tooth movement velocity and pain perception during canine retraction in orthodontic patients. METHODS This single blind study included 20 patients requiring upper first premolar extraction on both sides. One half of the upper arch was irradiated with a GaAlAs laser (810 nm, 200 mW, 10 points, 21...

OBJECTIVES To analyze the results of employing en masse retraction of the maxillary anterior dentition using palatal temporary skeletal anchorage devices (TSADs) as the exclusive source of anchorage. MATERIALS AND METHODS A retrospective clinical investigation supported by preliminary case reports was performed comparing pretreatment cephalometric radiographs with those taken after en masse r...

In the second part of this series, three clinical examples are presented to illustrate the use of auxiliary space-closure springs with clinically manageable moment-to-force ratios and new canine brackets to accommodate these springs within the framework of conventional and straight-wire 0.018-inch appliance systems. Eligiloy retraction spring models (0.1650 inch x 0.02150 inch) in the edgewise ...

BACKGROUND This study was performed to evaluate the treatment effects of the antero-posterior lingual retractor (APLR), focusing on the 3-dimensional (3D) tooth movement of the maxillary anterior teeth and their alveolar bone levels. METHODS En masse retraction was performed using either the C-lingual retractor (CLR, C-group, n = 9) or the antero-posterior lingual retractor (APLR, AP-group, n...

Background: This review aims to discuss various canine retraction techniques using frictionless mechanics. Methods: Between 1930 and February 2022, searches were conducted about fixed orthodontic appliances in databases, including PubMed Central, Science Direct, Wiley Online Library, the Cochrane Textbooks, Google Scholar, Research Gate, manual searching. Results: After removing duplicate artic...