상악 전치부 임플란트 순측골 소실에 대한 평가

Abstract

The purpose of this study was to evaluate the change, the amount of resorption and thickness of labial bone in anterior maxillary implant using cone beam computed tomography with Hitachi CB Mercuray(Hitachi, Medico, Tokyo, Japan). Twenty-two patients with 26 impalnts were followed -up and checked with CBCT. 21 OSSEOTITE NT？？ (3i/implant Innovations, Florida, USA) and 5 OSSEOTITE？？ implants (3i/implant Innovations, Florida, USA) were placed at anterior region and they were positioned vertically at the same level of bony scallop of adjacent teeth. Whenever there is no lesion or labial bone was intact, immediate placement was tried as possible as it could be. Generated bone regeneration was done in the patients with the deficiency of hard tissue using Bio-Oss？？ (Geistlich, Wolhusen, Switzerland) and Bio-Gide？？ (Geistlich, Wolhusen, Switzerland). Second surgery was done in 6 months after implant placemen and provisionalization was done during 3 months. Definite abutment was made of porcelain, gold and zirconia, and was attached after provisionalization. Two-dimensional slices were created to produce sagittal, coronal, axial and 3D by using OnDemand3D (Cybermed, Seoul, Korea). The results were as follows; 1. Seventeen implants showed the existence of labial bone in top third of implant. Existence of labial bone in top third scored about 65%. Implant that positioned more distally(canine>lateral>cental) and placed with GBR revealed higher rate of existence of labial bone in top third of implant. 2. The mean value of bone resorption(distance from top of implant to labial bone) was 1.32±0.86mm and the mean thickness of labial bone was 1.91±0.45mm. Conclusively, it is suggested that the thickness more than 1.91mm could reduce the amount and incidence of resorption of labial bone in maxillary anterior implant.