## 4 Discussion
The digital occlusal analysis is a neutral diagnostic method that identifies the location and balance of lower jaw movements after orthodontic treatment [44]. According to [PERSON], the T-Scan system can be used in a treatment protocol [45]. Some anatomical features can influence precision. The different widths of dental arches can affect the accuracy of scans. In a clinical trial with Trios scanners (3 Shape), no significant differences were found between width and accuracy. The scanning technique is more important than the shape and length [7]. According to a literature review by [PERSON] et al., virtual interocclusal records with intraoral scanners presented acceptable results for diagnostic precision, with sensitivity of 0.76, specificity of 0.80, diagnostic odds ratios of 14.77, area under the summary receiver operator characteristic of 0.87, cut-off point of 80, positive likelihood ratio of 3.66, and negative likelihood ratio of 0.31. The pooled data for trueness and precision were within acceptable limits. The studies included in the review reported accurate occlusion for fixed restorations fabricated using virtual interocclusal records with intraoral scanners. Furthermore, most of the research on trueness based on virtual occlusal contact zone reported acceptable accuracy [46]. Together with other technologies and computerized devices, intraoral scanning represents one of the most important instruments introduced in dental clinical practice, and future studies are needed in order to understand the possibilities and limitations of these new technologies [47; 48]. An alternative to intraoral is extraoral scanning. They are usually applied in cases where the clinician does not have an intraoral scanner available or prefers to work with conventional impression methods. An extraoral scan is a laboratory scan of an impression or plaster cast. Precision of extraoral scanning is acceptable in scanning any scope of arch region [49]. In a comparative study, the extraoral scanners showed substantially higher precision measurements for cross-arch measurement. Surface topography did not correlate to precision; rather, precision correlated with the scanning mechanism. For quadrant scanning, both intraoral and extraoral scanners are recommended, but extraoral scanners are recommended for full-arch scanning [50]. The accuracy and reproducibility of occlusal marking through the T-Scan system are still uncertain. A preliminary study was conducted on four specific points loaded on a sensor by applying weights from 0.1 to 10 kg. The results showed that certain insensitive zones were caused by anatomical features, the most sensitive area was measured from 0.1 to 2.1 kg, and the device was more suitable for recording within lower loads. Although the system has certain shortcomings in terms of reproducibility, it contributes to achieving diagnosis and treatment of occlusal contacts for quantitative estimation [25]. T-Scan can be used in the case completion process. After the orthodontic appliance is removed, changes in occlusion result from \"settling\" because teeth can move freely in the periodontium. Despite subsequent treatment, a visually \"perfect\" Angle Class I relationship and ideal occlusal contacts are often not the result of tooth movement alone. Creating simultaneous and uniform contacts after the removal of a fixed appliance can be achieved using T-Scan data to optimize the final occlusal contact pattern. The software's force distribution and timing indicators (the two- and three-dimensional force views, percentage of force per tooth, per quadrant, per half-arch, the center of force, and the occlusion and disocclusion time) help obtain an ideal occlusal force distribution during the completion of the case [51; 52]. Through a virtual procedure, the T-Scan system detects occlusal contacts and intraoral scanners obtain the occlusal surfaces.