Deporter Douglas A, Kermalli Jaffer, Todescan Reynaldo, Atenafu Eshetu
Faculty of Dentistry, University of Toronto, 124 Edward St., Toronto, Ontario, Canada.
Int J Periodontics Restorative Dent. 2012 Oct;32(5):563-70.
This article updates the results of a prospective clinical trial of press-fit, sintered, porous-surfaced dental implants placed in the posterior mandible of partially edentulous patients. Implants used had overall lengths (including transgingival collar regions) of 7 or 9 mm with designed intrabony lengths (lengths of sintered surface in contact with bone) of 6 or 8 mm. Forty-eight implants were placed in 24 patients, the majority of which replaced molar teeth, and the mean crown-to-root ratio was 1.4. Over 10 years of implant function, 2 patients with 3 implants died and 3 patients with 4 implants were lost to follow-up because of infirmity or relocation. The survival and success rates were both 95.5%. Two implants failed; the mean cumulative crestal bone loss (measured from the implant-abutment interface) for the remaining implants was 1.2 mm. Crestal bone loss was not affected by the crown-to-root ratio, prosthesis design, or whether an implant was the most distal unit in a sextant. However, there was a trend for greater crestal bone loss when implants were opposed by implants rather than by natural teeth.
本文更新了一项前瞻性临床试验的结果，该试验针对部分牙列缺损患者下颌后部植入的压配式、烧结多孔表面牙种植体。所使用的种植体总长度（包括龈上颈部区域）为7或9毫米，设计的骨内长度（与骨接触的烧结表面长度）为6或8毫米。在24名患者中植入了48颗种植体，其中大多数替代磨牙，平均冠根比为1.4。经过10多年的种植体功能观察，2名植入3颗种植体的患者死亡，3名植入4颗种植体的患者因身体虚弱或搬迁失去随访。生存率和成功率均为95.5%。两颗种植体失败；其余种植体的平均累计牙槽嵴骨吸收（从种植体-基台界面测量）为1.2毫米。牙槽嵴骨吸收不受冠根比、修复体设计或种植体是否为牙弓某一区段最远端单位的影响。然而，当种植体与种植体相对而非与天然牙相对时，牙槽嵴骨吸收有增加的趋势。
