## 1 _Introduction_  
Digital technology in dentistry is undergoing rapid development. Digital dental impressions made by intraoral scanners have many different applications and advantages over classic impressions, especially during the pandemic. These advantages include a lack of contact with the mucosa, comfort due to the lack of impression material, immediate visualization on the screen with the possibility of inspection and correction, real-time visualization, less time consumption, and easy and selective repeatability [1]. In contrast,conventional impressions require dentists to make a tray selection, perform an impression using different materials and methods depending on the specific case, disinfect the impression, ship it to the laboratory, pour the impression, and ultimately create a master model. The digital impression procedure has fewer steps, which includes software setup, scanning, digital shipping to the laboratory, and creating a digital master model [2]. Accuracy can be affected by various factors, such as operational and clinical differences (e.g., need for coating, larger scanner head, and specific distance from the target; absence of in-office milling units; difficulty in detecting deep margin lines in prepared teeth and/or in case of bleeding; and need for a learning curve) and cost (e.g., purchase and management costs) [3; 4]. Accuracy is the consolidation of two elements, both essential and complementary: \"trueness\" and \"precision.\" The term \"trueness\" refers to the ability of a measurement to match the actual value of the quantity being measured. Precision is defined as the ability of a measurement to be consistently repeated or, simply put, the ability of the scanner to produce repeatable results when applied in varied measurements of the same object [5]. Intraoral digital impression techniques can be discussed in terms of different dimensions, including the categories and principles of currently available intraoral digital impression apparatus; their operating characteristics; and a comparison of the operation, accuracy, and repeatability of intraoral digital impressions and conventional impressions [6]. Dental arches typically have different widths depending on personality traits (e.g., small, elongated, square, or narrow face; large, medium, or small head size, etc.) or age (child or adult), which can affect the precision of some intraoral scanners during the scanning of the whole jaws [7]. The scanning area and scanning accuracy are influenced by the type of intraoral scanner, scanning distance, and scanning angle selected to acquire the digital scans [8]. A new option is optical jaw-tracking systems, which can record mandibular motion during various treatment phases. The process allows occlusal adjustments using the patient's mandibular motion and facilitates the prosthetic design process, thus minimizing chair time at delivery [9]. This technique of optical jaw tracking for digital recording of the maxillomandibular relationship can visualize the maximum intercuspation and centric occlusion [10]. In a comparative research, [PERSON] et al. measured the accuracy (trueness and precision) of the maxillomandibular relationship at the centric relation position recorded using three different intraoral scanners with or without an optical jaw tracking system. Except for one intraoral scanner system, the optical jaw tracking system improved the trueness value [11]. An additional new software application can directly combine and merge three-dimensional cone beam computed tomography (CBCT) and electronic jaw motion tracking (JMT) information. This examination can improve the treatment of bruxism and temporomandibular disorders (TMD) [12]. Orthodontic treatment is aimed at improving not only the aesthetics but also the function. Achieving a balanced occlusion with uniform contacts without blockages is necessary to attain normal masticatory function and muscle balance [13; 14].