Department of Fixed and Removable Prosthodontics and Dental Material Science, School of Dental Medicine, University of Zurich, Zurich, Switzerland.
Clin Oral Implants Res. 2012 Jan;23(1):49-54. doi: 10.1111/j.1600-0501.2011.02174.x. Epub 2011 Apr 19.
The aim of the present multi-center study was to evaluate the treatment outcome of immediately restored one-piece single-tooth implants with a diameter of 3 mm after 1 year.
A total of 57 one-piece implants (NobelDirect 3.0) were inserted in 47 patients (26 females, 21 males) with a mean age of 31 years (range: 17-76 years) at five different centers. The implants replaced maxillary lateral incisors and mandibular incisors. The implants were placed either in conjunction with tooth extraction or in healed sites, and all implants were immediately restored with a provisional resin crown. If needed, the abutment part of the implant was prepared before crown cementation. The permanent crown was placed after 1.9-14.5 months. Radiographs were taken at implant insertion as well as after 6 and 12 months to evaluate the peri-implant marginal bone level and bone loss. Moreover, plaque, bleeding on probing and complications were assessed.
A total of 44 patients (23 females, 21 males) with 54 implants were available for the 1-year follow-up. One implant was lost, thus the 1-year implant survival was 98%. A statistically significant mean marginal bone loss was observed between baseline and 6 months (1.1 mm, range: -0.7 to 4.4 mm; n=49) and between baseline and 12 months (1.6 mm, range: -0.8 to 4.6 mm; n=50). A total of 18% of the implants were characterized by a bone loss of more than 3 mm. No bleeding on probing was observed around 83% of the implants. Plaque was registered at 15% of the implants. The most common complications were related to the provisional crown, i.e. fracture (n=3) and loss of retention (n=3).
A high 1-year implant survival was observed in the present study. However, the excessive peri-implant marginal bone loss around several implants indicates that this implant should be used with caution until further studies have been conducted.
本多中心研究的目的是评估即刻修复直径为 3 毫米的一体式单颗种植体在 1 年后的治疗效果。
在 5 个不同中心，共有 47 名患者（26 名女性，21 名男性）接受了 57 颗一体式种植体（NobelDirect 3.0）的植入治疗。这些种植体替代了上颌侧切牙和下颌切牙。种植体被植入拔牙创或愈合的牙槽窝中，并立即使用临时树脂冠进行修复。如果需要，在冠粘结前对种植体的基台部分进行预备。在 1.9-14.5 个月后放置永久冠。在种植体植入时以及植入后 6 个月和 12 个月拍摄 X 光片，以评估种植体周围边缘骨水平和骨丢失情况。此外，还评估了菌斑、探诊出血和并发症。
共有 44 名患者（23 名女性，21 名男性）和 54 颗种植体接受了 1 年的随访。1 颗种植体脱落，因此 1 年的种植体存活率为 98%。在基线和 6 个月（1.1 毫米，范围：-0.7 至 4.4 毫米；n=49）以及基线和 12 个月（1.6 毫米，范围：-0.8 至 4.6 毫米；n=50）之间，观察到有统计学意义的平均边缘骨丢失。共有 18%的种植体表现出超过 3 毫米的骨丢失。83%的种植体周围无探诊出血。15%的种植体上有菌斑。最常见的并发症与临时冠有关，即折裂（n=3）和固位丧失（n=3）。
本研究观察到了高的 1 年种植体存活率。然而，一些种植体周围过多的边缘骨丢失表明，在进一步的研究进行之前，应谨慎使用该种植体。
