Jemt T, Rubenstein J E, Carlsson L, Lang B R
Brånemark Clinic, Göteborg, Sweden.
J Prosthet Dent. 1996 Mar;75(3):314-25. doi: 10.1016/s0022-3913(96)90491-6.
Four centers in the United States and Sweden have been working for 2 years to develop systems and methods for measuring fit at the prosthodontic interface. Two systems are based on stylus contact techniques, one system uses a laser as its reader source, and one system is photogrammetric. All the systems are capable of providing data as three-dimensional x, y, and z axes coordinate values that can be transformed into linear and angular data that characterize the bearing surfaces of abutments or abutment replicas and their mating components in the prosthesis framework. The centroid, a single point computed from the collected data, was the measurement unit, derived for these bearing surfaces, that was used to compare the systems. All four methods can most likely detect misfits that are relevant in the clinical setting; however, only one system can be used intraorally. When any measurement system is assessed, the data should always be examined for repeatability to establish the reliability of the system. This investigation made comparisons among the measurement methods used at the four centers. It was apparent from this study that comparisons of data from measurement systems should be rounded to the nearest 10 microns. The SDs determined in the comparisons were larger than 5 microns and therefore misfits should be calculated in terms smaller than 10 microns. This final point is important to the clinician who relies on research reports about precision of fit when selecting treatment approaches in caring for the implant prosthodontic needs of their patients.
美国和瑞典的四个中心已经开展了为期两年的工作，以开发用于测量口腔修复界面贴合度的系统和方法。其中两个系统基于触针接触技术，一个系统使用激光作为读取源，还有一个系统是摄影测量法。所有这些系统都能够提供作为三维x、y和z轴坐标值的数据，这些数据可以转换为线性和角度数据，以表征基牙或基牙复制体及其在修复体框架中的配合部件的支承面。形心是根据收集的数据计算得出的一个单点，是为这些支承面推导出来的测量单位，用于比较各系统。所有这四种方法很可能都能检测出临床环境中相关的不贴合情况；然而，只有一个系统可以在口腔内使用。在评估任何测量系统时，都应始终检查数据的可重复性，以确定该系统的可靠性。这项研究对四个中心使用的测量方法进行了比较。从这项研究中可以明显看出，测量系统数据的比较应精确到最接近的10微米。比较中确定的标准差大于5微米，因此不贴合度应以小于10微米的单位来计算。这最后一点对于在为患者的种植修复需求选择治疗方法时依赖于关于贴合精度的研究报告的临床医生来说很重要。
