In this case the retainer was first bonded on the 41 and then, after closing the loops of about 2 mm, on the 32 and 42. The bonding procedure is also fundamental to achieve the sought after dental shift. After drawing in the etching agent, washing generously with water and blowing air till seeing the dehydrated surface of the enamel, the adhesive is applied and polymerized.Īt this point the wire is put in place and covered with a 2 mm thick medium viscosity fluid composite layer. The adhesion procedure for the device is carried out etching the lingual surfaces with orthophosphoric acid for 30 seconds. The retainer was further activated opening the loops of about 2 mm and bending the part of the wire to be bonded on teeth 32 and 41 buccally and the one to be bonded on the canines lingually. Loops are added in order to increase the elastic properties of the wire and, as it will be explained during the bonding procedure, will make it possible to activate the device in order to achieve the arch expansion. The first retainer used was shaped so that it could passively fit to the lingual surface of the teeth from 34 to 44, except for the 31, and at interdental level with vertical U-loops (about 2 mm wide and 4-5 mm long). In order to regain the necessary space to achieve the alignment, it was decided to perform a stripping procedure from 36 distal to 45 distal in addition to the expansion. This wire is shaped making first and second order bends and further activated according to the laws of biomechanics. These are devices made using a 0.175 inches thick interweaved steel wire commonly used to make fixed retainers. The request for an invisible and little annoying treatment made by the patient drove us to carry out a lingual therapy without brackets, in this case using active retainers (pic 7). The patient under examination in this work presented a Class I dental malocclusion characterized by a severe crowding of the mandibular arch (pics 1-6) and marked uneasiness in performing everyday home dental hygiene. This technique, which has undergone constant evolution over the years, has got the advantage of combining the invisibility feature of the therapy and the great comfort due to the absence of brackets touching the tongue. “Una proposta per la gestione di disallineamenti anteriori: il mantenitore attivo di contenzione (MAC)“). ![]() ![]() Journal of Clinical Orthodontics, 2000 Macchi A, Rania S, Cirulli N. “Fixed Active Retainer for Minor Anterior Tooth Movement”. ![]() Aldo Macchi in the early Nineties and first published in Italy and abroad by Prof. In these cases it is possible to carry out a fixed lingual orthodontics without brackets, an innovative technique devised by Prof. The request for an orthodontic treatment by patients is often motivated by the desire to improve the appearance of their smiles: more and more often they ask for an orthodontic appliance that is little annoying and completely invisible.
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