상악 대구치 발치 후 치조제보존술을 통한 상악동 함기화의 감소 및 치조골 높이의 보존

Abstract

Aim: The aim of the current study is to present a bilateral clinical case in the posterior maxilla, in which alveolar ridge preservation (RP) was performed to prevent sinus pneumatization and allow one-stage implant placement.Material and Methods: In 2007, the patient was presented with a hopeless left second maxillary premolar and a maxillary first molar due to advanced periodontitis. Extraction was performed; however, RP was not performed. On the opposite side, in 2016, the right second maxillary premolar and the maxillary first molar were extracted for the same reason. Extraction and RP was performed using collagenated DBBM and a collagen plug.Results: In the left maxilla, pneumatization of the sinus floor occurred, resulting in residual ridge height of 1 mm. Consequently, sinus lift by lateral approach had to be performed. 8 months after surgery, two 10 mm length implants were placed simultaneously with further sinus lift by crestal approach. The total treatment period was 14 months. In the right maxilla, the cone-beam computed tomography (CBCT) taken 3 months after RP, revealed residual ridge height of 6.27 mm at the right maxillary second premolar site, and 7.46 mm at the first molar site. Two 8 mm length implants were placed with simultaneous sinus lift procedure by the crestal approach. The total treatment period was 6 months.Conclusion: Ridge preservation in the posterior maxilla is a useful therapeutic option to prevent vertical intra-antral resorption, thereby improving the feasibility of one-stage implant placement and reducing the total treatment period.