Meredith N, Friberg B, Sennerby L, Aparicio C
Department of Oral and Dental Science, Bristol Dental Hospital, United Kingdom.
Int J Prosthodont. 1998 May-Jun;11(3):269-75.
The Periotest is an electronic instrument that has been advocated for the measurement of implant stability and osseointegration. The aims of this investigation were to establish the relationship between contact time and PTV values when the Periotest was used to assess implants in vivo and in vitro, and to investigate the influence of the striking height of the Periotest handpiece and the length of implant abutment.
The accelerometer signal from a Periotest was captured and compared with the resulting PTV value. In vitro measurements of PTV and contract time were performed on a 3-mm abutment that had been attached to a 15-mm implant luted into an aluminium block, and were repeated on a patient in vivo. further measurements were made of the abutments of six implants in turn in the maxilla of the same patient. The standard abutment lengths on the implants were 3, 4 (x 2), 5.5 (x 2), and 7 mm.
The results indicated that there was a linear relationship between contact time and PTV value for implants measured in vitro and in vivo. Greater scatter of the in vivo data was attributed to test and patient variables including striking position, distance, and damping as a result of the presence of soft tissue. There was a linear relationship between the PTV value and the striking height for implant measurements in vivo and in vitro.
It can be concluded that the sensitivity of the Periotest to clinical variables including striking heights and handpiece angulation limit the application of the instrument as a clinical diagnostic aid to measure implant stability.
Periotest是一种电子仪器，已被提倡用于测量种植体稳定性和骨结合。本研究的目的是在体内和体外使用Periotest评估种植体时，确定接触时间与PTV值之间的关系，并研究Periotest机头的敲击高度和种植体基台长度的影响。
采集Periotest的加速度计信号，并与所得的PTV值进行比较。在体外，对连接到粘固在铝块中的15mm种植体上的3mm基台进行PTV和接触时间测量，并在患者体内重复进行。对同一患者上颌的6个种植体的基台依次进行进一步测量。种植体上的标准基台长度为3、4（×2）、5.5（×2）和7mm。
结果表明，在体外和体内测量的种植体中，接触时间与PTV值之间存在线性关系。体内数据的更大离散度归因于测试和患者变量，包括由于软组织的存在而导致的敲击位置、距离和阻尼。在体内和体外种植体测量中，PTV值与敲击高度之间存在线性关系。
可以得出结论，Periotest对包括敲击高度和机头角度在内的临床变量的敏感性限制了该仪器作为测量种植体稳定性的临床诊断辅助工具的应用。
