Department of Stomatology, Faculty of Dentistry, University of Seville (US), C/Avicena, s/n, 41009, Seville, Spain.
Department of Buccofacial Prostheses, Faculty of Dentistry, Complutense University of Madrid (U.C.M.), Pza. Ramón y Cajal, s/n, 28040, Madrid, Spain.
J Dent. 2017 Aug;63:85-93. doi: 10.1016/j.jdent.2017.05.022. Epub 2017 Jun 3.
To evaluate the two-year survival rate (SR) and marginal bone loss (MBL) of fixed dental prostheses (FDPs) supported by straight (S) and tilted (T) implants under the influence of diverse study variables.
A prospective investigation comprising 21 patients provided with a total of 27 maxillary screw-retained restorations fixed to 70 dental implants was developed. Two groups of implants were considered depending on their inclination with respect to the occlusal plane: Group 1 (S, n=37): straight/axial implants and Group 2 (T, n=33): tilted/angled fixations. Each FDP was supported by a combination of S and T implants. SR and MBL were assessed at the time of loading and two years after surgery. Patient-, surgical- and/or rehabilitation-related information was gathered. Data were statistically analysed at the α=0.05 significance level.
After 24 months, a 100% SR was achieved and the MBL of S and T implants were statistically similar. T implants located in the molar region showed lower MBL than did those replacing premolars (p=0.031).
Upright and angled fixations inserted at posterior maxillary areas resulted in comparable survival rates and peri-implant MBL after two years. The marginal bone resorption around tilted implants depended on their location.
Screw-retained restorations fixed to straight and tilted implants seem to be a safe treatment option in posterior atrophic maxillae.
评估受多种研究变量影响的直（S）和倾斜（T）种植体支持的固定义齿（FDP）的两年存活率（SR）和边缘骨丧失（MBL）。
开展了一项前瞻性研究，共纳入 21 名患者，他们共接受了 27 个上颌螺钉固位修复体，固定于 70 个牙种植体。根据与咬合平面的倾斜角度，将种植体分为两组：第 1 组（S，n=37）：直/轴向种植体和第 2 组（T，n=33）：倾斜/成角固定。每个 FDP 由 S 和 T 种植体的组合支撑。在加载时和手术后两年评估 SR 和 MBL。收集患者、手术和/或康复相关信息。数据在 α=0.05 显著性水平进行统计分析。
24 个月后，达到了 100%的 SR，S 和 T 种植体的 MBL 统计学上相似。位于磨牙区的 T 种植体比替换前磨牙的种植体的 MBL 更低（p=0.031）。
后上颌区植入的直立和倾斜固定装置在两年后具有相似的存活率和种植体周围 MBL。倾斜种植体周围的边缘骨吸收取决于其位置。
固定于直和倾斜种植体的螺钉固位修复体在后牙萎缩的上颌骨中似乎是一种安全的治疗选择。
