Forced eruption with miniscrews; inter-arch [corrected] method with vertical elastics versus intra-arch method using the Derton-Perini technique: two case reports

Orthodontic preprosthetic treatment is an important feature of interdisciplinary dental therapy in the adult patient. Extrusion can be very useful to obtain successful prosthodontic results. The literature describes different ways to obtain forced dental eruption. Miniscrews represent a step towards resolving the problem of anchorage in orthodontics, including in forced eruption cases. The aim of this study is to report two cases of orthodontic preprosthetic extrusion by means of miniscrews and bone anchorage. We will describe and discuss the indications, orthodontic and surgical technique and the clinical advantages.

In the first reported case, a decayed upper molar was extruded using miniscrews and an inter-arch technique (direct skeletal anchorage), which needs patient compliance to properly position the inter-arch elastics. In the second case, an upper premolar with an oblique corono-radicular fracture underwent forced eruption by means of intra-arch miniscrews (indirect bone anchorage with the "Derton-Perini" technique). Patient compliance was not required.

Adequate extrusion of the treated teeth was obtained, with no undesired movement of the neighbouring teeth. Using the "Derton-Perini" technique, we reached our objectives without patient compliance.

Miniscrews for skeletal anchorage proved to be an effective device to obtain extrusion for prosthetic purposes without undesired movements on other teeth and with no need for patient compliance when used in the same arch.