Intrusion of Over-Erupted Maxillary Molar Teeth By Using Mini-Screw Anchorage

OBJECTIVE : Over-erupsiyon of upper molars and premolars following loss of the opposing tooth is a common clinical finding. In such cases, when the interocclusal space is reduced, intrusi ontreatment with miniscrew implants of the upper posterior teeth to correct a canted occlusal plane could be an ideal treatment strategy for the mandibles’prosthetic treatment with implant supported fixed dentures. The aim of the study was the effectiveness of miniscrew anchorage for intrusion of the posterior upper teeth to gain sufficient interocclusal space for implant supported mandible fixed partial dentures. METHODS : The study was comprised of 9 patients (aged 27 to 59 years; mean 36,4 years) with overerupted maxillary posterior teeth. Four self-drilling miniscrew implants (2 for buccal alveolar bone region and 2 for posterior palatal area) were inserted. An elastomeric chain applied 80 g of force to each overerupted maxillary posterior teeth. The elastomeric chain was replaced every three weeks. Panoramic radiograms were obtained preintrusion and immediately after completion of the intrusion. The panoramic radiograms were superposed and the distances between the occlusal planes of first molar teeth were measured. Then osseointegrated implants placed in the opposing posterior mandible region and prosthetic treatments were finalized. RESULTS: Upper posterior teeth were intruded with an average of 4,42± 0,62 mm according to changings of the first maxillary molars’ occlusal planes, after in a mean of 4,89 ± 1,00 months active treatment. There were not any rooth resorption determined during the treatment acccording to radiograms .A good occlusion was achieved with implant supported fixed partial dentures for mandible after treatment.