Research Assistant, Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada.
Director, Rehabilitation Research and Technology Development, Glenrose Rehabilitation Hospital, Edmonton, Alberta, Canada.
J Prosthet Dent. 2018 Jan;119(1):178-184. doi: 10.1016/j.prosdent.2017.02.021. Epub 2017 May 20.
The success of implants for bone-anchored hearing aids (BAHA) relies on proper osseointegration at the bone-implant interface. Clinical evaluation of implant stability is important in prescribing loading, identifying the risk of failure, and monitoring the long-term health of the implant.
The purpose of this in vitro study was to evaluate 2 measurement systems for BAHA implant stability: the most commonly used, Osstell implant stability quotient (ISQ), and a newly developed advance system for implant stability testing (ASIST).
BAHA implants (Oticon Medical Ponto and Cochlear BAHA Connect systems) were installed in plastic materials with adhesive to simulate implants integrated in bone with varying levels of interface stiffness. Different lengths of BAHA abutments were used with each implant specimen, and stability measurements were obtained with both the Osstell ISQ and the ASIST systems. The measurement systems were evaluated in terms of sensitivity to differences in interface stiffness and the effect of abutment length on the stability measurement. Repeated measures ANOVA followed by post hoc t tests were used for the comparisons with a Bonferroni adjusted alpha value of .05/15 = .003 to control for potential type 1 errors.
Changing the abutment length of a single implant installation had minimal effect on the ASIST stability coefficient, whereas large variations were observed in the Osstell implant stability quotient (ISQ). The Osstell showed a clear relationship of decreasing ISQ with increasing abutment length for both the Oticon Medical and the Cochlear implant systems. Both the ASIST and the Osstell were found to be sensitive to changes in interface properties, with the ASIST being more sensitive to these changes.
The ASIST system is more sensitive to changes in interface properties and shows smaller variation because of changes in abutment length than the Osstell ISQ system.
骨锚定式听力助听（BAHA）植入物的成功依赖于骨-植入物界面的适当骨整合。植入物稳定性的临床评估对于加载、识别失败风险以及监测植入物的长期健康状况非常重要。
本体外研究旨在评估 2 种用于 BAHA 植入物稳定性的测量系统：最常用的 Ostell 植入物稳定性商（ISQ）和新开发的植入物稳定性测试先进系统（ASIST）。
将 Oticon Medical Ponto 和 Cochlear BAHA Connect 系统的 BAHA 植入物安装在具有不同界面刚度的塑料材料和胶粘剂中，以模拟植入物与骨骼的整合。使用每个植入物标本的不同长度的 BAHA 接杆进行稳定性测量，并使用 Ostell ISQ 和 ASIST 系统获得稳定性测量值。从敏感性、界面刚度差异和接杆长度对稳定性测量的影响等方面对这两种测量系统进行了评估。使用重复测量方差分析（ANOVA）和事后 t 检验进行比较，使用 Bonferroni 调整的α值（α/15 =.003）来控制潜在的Ⅰ类错误。
改变单个植入物安装的接杆长度对 ASIST 稳定性系数几乎没有影响，而 Ostell 植入物稳定性商（ISQ）则有较大的变化。对于 Oticon Medical 和 Cochlear 植入系统，Ostell 都显示出随着接杆长度的增加，ISQ 逐渐减小的明确关系。ASIST 和 Ostell 都被发现对界面特性的变化敏感，而 ASIST 对这些变化更敏感。
ASIST 系统对界面特性的变化更敏感，并且由于接杆长度的变化而导致的变化较小，而 Ostell ISQ 系统则变化较大。
