Culjat Martin O, Choi Mijin, Singh Rahul S, Grundfest Warren S, Brown Elliott R, White Shane N
Center for Advanced Surgical and Interventional Technology (CASIT), University of California Los Angeles, CA 90095-1668, USA.
J Prosthet Dent. 2008 Mar;99(3):218-24. doi: 10.1016/S0022-3913(08)60046-3.
Current methods of measuring soft tissue thickness over potential dental implant sites and locating submerged implants may be imprecise or invasive.
The purpose of this study was to develop and demonstrate proof of the concept of a customized ultrasound imaging system in locating and measuring the depth of implants submerged beneath soft tissue.
A complete ultrasound system, including a customized soft tissue-matched transducer, transceiver, and digital signal processing algorithms, was created for the specific application of detecting dental implants anchored in bone beneath soft tissue. The system was used to locate implants placed in cancellous bone and measure overlying soft tissue depth in a porcine model. Ten measurements were made on each porcine model by manually moving the transducer laterally over the soft tissue surface. Data were analyzed with descriptive statistics.
The mean signal-to-noise ratio, SNR (standard deviation), from the bone surfaces, was 19.1 (4.6) dB, and the mean SNR from the implant surfaces was 36.6 (2.2) dB, resulting in a mean difference of 17.5 dB, or x56.2, in average signal power between the bone and implant surfaces. Consequently, implants were easily and accurately (+/-0.2 mm) located beneath at least 5 mm of soft tissue. Likewise, soft tissue depths over bone and implants were accurately measured and were within the corresponding caliper tissue measurement error (+/-0.5 mm).
The specialized ultrasound imaging system located and measured the depth of implants placed in bone submerged beneath soft tissue in a porcine model.
目前测量潜在牙种植体部位软组织厚度以及定位埋入式种植体的方法可能不准确或具有侵入性。
本研究的目的是开发并证明定制超声成像系统在定位和测量埋于软组织下方的种植体深度方面的概念验证。
创建了一个完整的超声系统，包括定制的软组织匹配换能器、收发器和数字信号处理算法，用于检测锚固在软组织下方骨内的牙种植体这一特定应用。该系统用于在猪模型中定位置于松质骨中的种植体并测量其上覆盖的软组织深度。通过在软组织表面横向手动移动换能器，对每个猪模型进行了十次测量。数据采用描述性统计进行分析。
来自骨表面的平均信噪比（SNR，标准差）为19.1（4.6）dB，来自种植体表面的平均SNR为36.6（2.2）dB，导致骨表面和种植体表面之间的平均信号功率差为17.5 dB，即x56.2。因此，种植体能够轻松且准确地（±0.2 mm）定位在至少5 mm厚的软组织下方。同样，骨和种植体上方的软组织深度得到了准确测量，且在相应卡尺组织测量误差（±0.5 mm）范围内。
在猪模型中，专用超声成像系统能够定位并测量置于软组织下方骨内的种植体深度。
