Section for Digital Implant- and Reconstructive Dentistry (DIRecD), Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Switzerland.
Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Switzerland.
Clin Implant Dent Relat Res. 2019 Oct;21(5):968-976. doi: 10.1111/cid.12816. Epub 2019 Jul 16.
The evolution of retention forces in one-piece mini dental implants (MDIs) retaining implant overdentures (IODs) is of major importance, as the male parts cannot be exchanged, due to the implant design.
To report the evolution of retention forces of one-piece MDIs, retaining mandibular IODs with ball/ O-ring attachments during 5 years assessed in vivo.
Four MDIs were installed in the interforaminal region and immediately loaded using the existing mandibular complete denture. Directly post-op, at the 1-year and the 5-year follow-up, the retention forces were assessed with a validated strain gauge at each implant site separately.
At the male part, changes could only be observed at implant site 34: During the first year, there was a statistically significant increase, whereas the retention forces were decreased at the 5-year follow-up. At the female part, retention forces decreased significantly over time. Baseline values could be reestablished by exchanging the O-rings. The changes of the retention forces were more obvious in the posterior, compared to the anterior implants.
Retention forces at the female part decrease significantly over time, when retaining mandibular IODs by MDIs with ball/ O-ring attachments. Baseline values can be reestablished by exchanging the O-rings. At the male part, changes of retention forces depend on the implant location.
一体式迷你牙科种植体（MDIs）保留种植覆盖义齿（IODs）的固位力演变非常重要，由于种植体设计的原因，无法更换男式部件。
报告在体内评估的 5 年内，使用球/ O 型环附件保留下颌 IOD 的一体式 MDIs 的固位力演变。
在眶下区域安装了四个 MDIs，并立即使用现有的下颌全口义齿加载。直接术后、1 年和 5 年随访时，分别在每个种植体部位使用经过验证的应变计评估固位力。
在男式部件上，仅在植入物 34 位点观察到变化：在第一年，存在统计学上显著的增加，而在 5 年随访时，固位力降低。在女式部件上，固位力随时间显著下降。通过更换 O 型环可以重新建立基线值。与前牙植入物相比，后牙植入物的固位力变化更为明显。
当使用球/ O 型环附件的 MDIs 保留下颌 IOD 时，女式部件的固位力随时间显著下降。通过更换 O 型环可以重新建立基线值。在男式部件上，固位力的变化取决于植入物的位置。
