Shodadai S P, Türp J C, Gerds T, Strub J R
Department of Prosthodontics, Dental School, Albert Ludwigs University, Freiburg, Germany.
Int J Prosthodont. 2001 Nov-Dec;14(6):517-22.
The aim of this clinical study was to evaluate if an arbitrary facebow registration and transfer provides significant advantages for the fabrication of an occlusal appliance in comparison with the omission of such a procedure.
For 20 fully dentate adult patients diagnosed with bruxism, two Michigan occlusal splints were constructed. One of the two upper dental casts was transferred to the articulator with an arbitrary earpiece facebow; the other maxillary cast was mounted arbitrarily using a flat occlusal plane indicator. Upon splint delivery, the number of intraoral occlusal contacts and the time needed for chairside occlusal adjustment were recorded.
The number of occlusal contacts on the appliance fabricated with or without facebow was similar in most cases both in the articulator and in the mouth. The one-sided Wilcoxon rank sum test showed with high probability that the use of an arbitrary facebow does not yield a clinically relevant improvement with regard to the number of occlusal contacts or the chairside adjustment time.
From this pilot study, it appears that for the fabrication of an occlusal appliance, registration and transfer with an arbitrary earpiece facebow does not yield clinically relevant benefits. Of course, this conclusion cannot be transferred to other facebows and is restricted to the levels of clinical relevance defined in the study.
本临床研究的目的是评估与不进行该程序相比，任意面弓记录和转移在制作咬合器具方面是否具有显著优势。
对于20名被诊断为磨牙症的全口成年患者，制作了两个密歇根咬合夹板。两个上颌石膏模型中的一个通过任意耳塞式面弓转移到咬合架上；另一个上颌石膏模型使用平面咬合平面指示器任意安装。在交付夹板时，记录口内咬合接触的数量和椅旁咬合调整所需的时间。
在大多数情况下，使用或不使用面弓制作的器具在咬合架和口腔中的咬合接触数量相似。单侧Wilcoxon秩和检验显示，使用任意面弓在咬合接触数量或椅旁调整时间方面不太可能产生临床上相关的改善。
从这项初步研究来看，对于制作咬合器具，使用任意耳塞式面弓进行记录和转移似乎不会产生临床上相关的益处。当然，这一结论不能推广到其他面弓，并且仅限于该研究中定义的临床相关性水平。
