Implant Anchorage in Orthodontic Retrusion: A Case Report - Implant Anchorage in Orthodontic Retrusion: A Case Report - Open Access Pub

Mini screws represent a new treatment modality in orthodontic biomechanics. They provide absolute anchorage, no secondary movements and reduced orthodontic treatment time. Futhermore, the surgical procedure for mini implants placement is quite simple and this type of treatment requires no patient compliance. We selected a clinical case in order to emphasize one of the most important indications of the mini implants: retrusion of the upper incisors for a incresed overjet case in a young patient. Two mini implants were placed in order to obtain the correction of the overjet and the retrusion of the anterior teeth. The retrusion was obtained in a reduced period of time using retraction devices on crimpable hooks. DOI10.14302/issn.2473-1005.jdoi-17-1745 In the past years, mini implants were widely used for different orthodontic situations (uprighting, retrusion of anterior teeth in extraction cases, molar intrusion in anterior open bites, molar protraction, palatal expansion, etc.). The orthodontic (mini)implants simplify the biomechanics in multiple situations and, in terms of anchorage, they eliminate the need for auxiliary appliances 1, 2, 3. The literature regarding orthodontic implants is extensive, and their introduction respresents a revolution in orthodontic strategy 1, 2, 3, 4, 5, 6, 7, 8. Treatment planning must include radiographic examination for an accurate placement position. In more difficult cases, surgical guides can be manufactured in order to obtain a very precise position of the mini screws. The surgical procedure has a low morbidity rate but in some cases special considerations must be taken into account: the thickness of gingival mucosa (especially in patients with a thin gingival biotype), root morphology and disposition (crowding cases), age (due to a higher bone density in older patients), hygiene and mini screw type (dimensions, design and chemical composition). All the factors stated above must be considered in order to minimize implant failure. Treatment planning must also include a good evaluation of the case in order to establish the type of anchorage that needs to be used regarding mini implants: direct or indirect. Usually, in class II patients, with upper first bicuspids extractions, direct anchorage is used in the initial phase of the treatment (2-4 mm retraction of the upper teeth) and then the orthodontist can switch to indirect anchorage in order to prevent interferences 4, 5. Flared or protruded maxillary teeth ar usually encountered orthodontic patients with oral habits in history. In order to obtain a good overjet and