Absolute anchorage with universal t-loop mechanics for severe deepbite and maxillary anterior protrusion and its 10-year stability

Abstract

An adult patient with severe maxillary protrusion and deepbite who was congenitally missing two mandibular incisors was treated successfully by maximum retraction of the maxillary anterior teeth after extraction of the maxillary first premolars using a moment differential between the anterior and posterior segments created by a universal T-loop. Anterior teeth were moved with controlled tipping, and little anchorage loss of the posterior segments was experienced using the universal T-loop spring. Reduction of overbite was performed by absolute intrusion of both maxillary and mandibular anterior teeth. With retraction of the maxillary anterior teeth and recontouring of the mandibular canines, proper overjet and overbite were achieved. This report shows the 10-year stability of the case treated with the universal T-loop for the first time. (Angle Orthod. 2010;80:771-782.)

Efficacy of orthodontic mini implants for en masse retraction in the maxilla: a systematic review and meta-analysis

“…Extraction of the permanent teeth for retraction of the protruded front teeth is a routine approach in orthodontics. Various techniques such as headgear, Nance button, and transpalatal arches (TPA) have been proposed to achieve sufficient anchorage [ 5 , 8 , 9 , 12 , 28 , 31 , 45 ]. Nevertheless, anchorage control turned out to be highly demanding as the conventional approaches were commonly associated with anchorage loss, i.e., mesial migration of the posterior dental anchorage units.…”

The benefit of differential moment concept in managing posterior anchorage and avoiding bite deepening

“…Fortunately, these vertical forces may be beneficial to correct of excessive overbite during space closure. 11,12 The overall superimposition of cephalometric tracings showed that lips were retracted significantly due to maximum retraction of upper incisors and optimum retraction of lower incisors. Maxillary superimposition demonstrated minimum mesial movement of the upper molars and upper incisors were retracted in control tipping movement due to the proper application of alpha and beta moment.…”

Correction of Bimaxillary Protrusion with Four First Premolar Extractions and T-Loop Mechanics – A Case Report

“…The desired tooth movement can be obtained by modifying the angulation of the pre-activation bends, the dimensions of the springs, and the position of the T-loop. 7 The main characteristic of the T-loop is the possibility of obtaining, with different pre-activations or with the irregular positioning of the spring, differential moments or forces to achieve controlled space closure. 8…”