Purpose: To compare the aspect of the reproduction accuracy in studied methods of determination of the (CR) of jaws using the digital research methods. The methods used were bilateral manipulation by P.E. Dawson, frontal deprogrammer, leaf gauge, and intraoral device for recording of Gothic arch angle. Methods: To determine the reproduction accuracy of the centric relation of jaws, we examined 5 patients with intact dentition in a prosthetic dentistry clinic (first class in Angle’s system). For each method, 20 registrations of the centric jaw relation were carried out by one operator. The breaks between definitions were 30 minutes. A total of 400 CR recording operations were carried out (400 records of CR). In order to study the reproducibility of CR determination methods, 200 recorded mandible positions were analyzed by means of an analog-to-digital method (a macro kit Canon 650D, Canon 60 mm macro IS USM f2.8, Canon macro ring MR-14 EX and the computer program Adobe Photoshop) to assess the first occlusal contact obtained in the CR of jaws, while the other 200 were analyzed by means of a digital method (the computer program Avantis for 3D modeling, Prime as a laboratory 3D scanner (DOF), and Trios as an intraoral scanner (3Shape)) to assess the spatial position of the mandible in the CR. Statistical analysis was carried out using STATISTICA-10. In all statistical analysis procedures, the critical significance level p was assumed to be 0.05. Results: In the study of the data by means of the computer program Avanti 3D, the reproducibility of the mandible position in the CR reached 0.119 ± 0.012 mm for frontal deprogrammer, 0.225 ± 0.028, p ≤ 0.05 for bilateral manipulation by Dawson P.E., 0.207 ± 0.02, p ≤ 0.05 for leaf gauge, and 0.120 ± 0,013, p ≤ 0.05 using an intraoral device for recording the Gothic arch angle. The analog-to-digital method showed an identical tendency for reproduction of the mandible position. Conclusions: The digital analysis we made using the Avantis 3D program showed, with high confidence, that the maximum reproducibility of the CR position was reached by using our own design frontal deprogrammer and the device for recording Gothic arch angle.
The aim of the study was to investigate accuracy of the most frequently used methods of obtaining centric relation in clinical practice. Finding of CR was carried out in clinic of prosthodontic dentistry on a 5 patients with intact dentition using four methods that are most often used, including: bimanual manipulation, leaf gauge, using an anterior deprogrammind device, the technique of determining CR with intraoral devices recording the gothic angle. To assess the accuracy of each technique there were performed 10 registrations of the central relation by one operator (200 CR registrations), with 30 minutes' intervals between the CA determination. Analysis of the contacts in CR were carried out using a photometric method of investigation. The graphic images were downloaded in Adobe Photoshop for calculation, metric data translated into digital values. The studies above showed that the accuracy of finding CR in all methods were not ideal. It can be noted that the smallest deviation of the position of the first contact in the CR was observed with use of the anterior deprogrammind device and with the intoral gothic angle recording device. The deviation along the VO axis was 0.039±0.002 mm and 0.084±0.004 mm respectively, along the MD axis 0.043±0.002 mm and 0.054±0.001 mm, respectively. The greatest error of recording the CR was shown by bimanual manipulation Dawson technique, the deviation along the axis of the VO and MD was 0.634±0.04 mm and 0.388±0.04 mm, respectively.
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