Berhanu Bruk, Rizzo Piervincenzo, Ochs Mark
Research Undergraduate Laboratory for NDE and SHM Studies Department of Civil and Environmental Engineering University of Pittsburgh Pittsburgh, PA, 15261 e-mail:
Assistant Professor Laboratory for NDE and SHM Studies Department of Civil and Environmental Engineering University of Pittsburgh 942 Benedum Hall, 3700 O'Hara St. Pittsburgh, PA, 15261 e-mail:
J Appl Mech. 2013 Jan;80(1):0110281-110288. doi: 10.1115/1.4006947. Epub 2012 Nov 20.
In this paper we present a noninvasive technique based on the propagation of highly nonlinear solitary waves (HNSWs) to monitor the stability of dental implants. HNSWs are nondispersive mechanical waves that can form and travel in highly nonlinear systems, such as one-dimensional chains of spherical particles. The technique is based on the hypothesis that the mobility of a dental implant affects certain characteristics of the HNSWs reflected at the interface between a crystal-based transducer and the implant. To validate the research hypothesis we performed two experiments: first we observed the hydration of commercial plaster to simulate at large the osseointegration process that occurs in the oral connective tissue once a dental-endosteal threaded implant is surgically inserted; then, we monitored the decalcification of treated bovine bones immersed in an acid bath to simulate the inverse of the osseointegration process. In both series, we found a good correlation between certain characteristics of the HNSWs and the stiffness of the material under testing.
在本文中，我们提出了一种基于高非线性孤立波（HNSWs）传播的无创技术，用于监测牙种植体的稳定性。高非线性孤立波是一种非色散机械波，可在高度非线性系统中形成并传播，例如球形颗粒的一维链。该技术基于这样的假设：牙种植体的移动性会影响在基于晶体的换能器与种植体之间的界面处反射的高非线性孤立波的某些特性。为了验证这一研究假设，我们进行了两个实验：首先，我们观察了商用石膏的水化过程，以大致模拟牙骨内螺纹种植体手术植入后口腔结缔组织中发生的骨结合过程；然后，我们监测了浸泡在酸浴中的处理过的牛骨的脱钙过程，以模拟骨结合过程的逆过程。在这两个系列实验中，我们发现高非线性孤立波的某些特性与被测材料的刚度之间存在良好的相关性。
