Private Practice, Rome, Italy.
Department of Oral Implantology, Osaka Dental University, Osaka, Japan.
Clin Implant Dent Relat Res. 2018 Oct;20(5):668-673. doi: 10.1111/cid.12635. Epub 2018 Jul 23.
This study was aimed to investigate, over 5 years, bone response to "one-abutment onetime" (OA-OT) protocol in the restoration of implants inserted in the anterior maxilla. Additionally, influence of soft tissue biotype in the bone remodeling was investigated.
From January 2011 to January 2012, all consecutive patients presented with a hopeless tooth in the maxillary area between canines were enrolled. Post-extraction ridge preservation was performed. After 6 months, implant was midcrestaly inserted and intraoperative impression was taken. Two months thereafter an immediate definitive abutment with a provisional crown was inserted. At final crown connection, patients underwent a standardized periapical radiograph (T0). At 12 (T1), 24 (T2), 36 (T3), 48 (T4), and 60 (T5) months, radiographic follow-up and clinical control were carried out. Independent sample t-test was conducted to compare bone loss at different times. To detect the potential role of biotype, groups (thick TK vs thin TH) were compared by analysis of variance with general linear model.
Twenty-five patients were enrolled, but only 22 patients concluded the study. The radiographic analysis showed a stable longitudinal condition of bone levels after the first-year significant increasing (0.17 ± 0.25mm, 0.33 ± 0.25mm, 0.28 ± 0.27mm, 0.25 ± 0.26mm, 0.31 ± 0.35mm, and 0.31 ± 0.29mm, respectively at T1, T2, T3, T4, and T5). No statistical significant differences in bone loss among the two groups TH vs TK over the time (P = 0.952) were demonstrated.
Results showed that the OA-OT approach allow to obtain stable bone levels.
本研究旨在探讨在 5 年内，上颌前牙植入物采用“单基台一次修复”（OA-OT）方案时的骨反应。此外，还研究了软组织生物型对骨重塑的影响。
从 2011 年 1 月至 2012 年 1 月，所有连续出现上颌切牙区无希望牙的患者均被纳入研究。拔牙后进行牙槽嵴保存。6 个月后，采用中嵴位植入种植体并进行术中印模。2 个月后，立即插入一个带有临时冠的即刻修复基台。在最终的牙冠连接时，患者进行了标准化的根尖片（T0）。在 12 个月（T1）、24 个月（T2）、36 个月（T3）、48 个月（T4）和 60 个月（T5）时，进行了影像学随访和临床检查。采用独立样本 t 检验比较不同时间点的骨丢失情况。为了检测生物型的潜在作用，通过一般线性模型的方差分析比较了厚 TK 组和薄 TH 组。
共纳入 25 例患者，但只有 22 例患者完成了研究。影像学分析显示，在第一年有显著增加后，骨水平保持稳定的纵向状态（T1 时为 0.17±0.25mm、T2 时为 0.33±0.25mm、T3 时为 0.28±0.27mm、T4 时为 0.25±0.26mm、T5 时为 0.31±0.35mm 和 0.31±0.29mm）。TH 组和 TK 组在整个时间内的骨丢失差异无统计学意义（P=0.952）。
结果表明，OA-OT 方法可以获得稳定的骨水平。
