## 3 Discussion
Intraoral 3D scanners can capture fine details of the mucosae tissues, providing highly accurate 3D representations without the risk of distortion or material shrinkage that can occur with plaster models. Since digital models are not dependent on manual techniques, such as mixing and pouring plaster, there is a reduced risk of human error. Accurate measurements are essential not only for treatment planning but also for tracking patient progress over time and assessing the effectiveness of interventions. Moreover, digital measuring methods streamline workflow and facilitate better communication among multidisciplinary teams. As there is no need to cast alginate impressions or digitize plaster casts, model measurement can begin immediately once the digital 3D scan data set has been imported into the OnyxCeph\({}^{3\text{TM}}\) software. Therapy-relevant morphological changes can be assessed instantly after the 3D scan, and therapy can be adjusted accordingly. Since the digital model analysis takes limited time, the interdisciplinary coordination regarding the growth-related morphological changes in the maxilla of the newborn can be carried out directly during the patient's appointment. Parents and caregivers can be directly involved in the treatment planning process, and follow-up appointments can be arranged directly. The ability to define reference planes using digital measurement enables new measurement methods. As digitization continues, additional points, planes, and angles can be added to the digital analysis for even more detailed analysis. For long-term measurement studies, digital storage and unrestricted access to high-quality models even after many years of treatment is a great advantage. Further extensions of existing analyses can also be carried out in the future by duplicating the stored models on existing models, thus creating larger data pools for interdisciplinary studies. However, while the benefits of digital model analysis are undeniable, there are several challenges and limitations that need to be considered. As with IOS, the initial investment in analysis software can be prohibitive, particularly for smaller practices or solo practitioners with already existing analysis software. Using the digital model analysis means that the practitioner is dependent on technology. It requires functional computer and software conditions. Moreover, the presented computer-aided measurement method of unilateral cleft lip and palate models in OnyxCeph3 TM assumes familiarity with the software, limiting accessibility for practitioners new to the tool. The digital model analysis additionally requires profound comprehension of the maxillary anatomy of patients with cleft lip and palate from the practitioner. Moreover, it has to be considered the challenges in identifying measurement points when measuring models with cleft lip and palate include the anatomical complexity and variability of the cleft region. The irregularities in the structure of the soft tissues and the alveolar ridge can make it difficult to accurately locate consistent reference points. Variations in cleft severity and age-related structural changes can complicate the identification of measurement points. These factors can lead to measurement errors or inconsistencies. It may be helpful to conduct digital model analysis on colored intraoral scans to better detect anatomical landmarks. Moreover, patient-related factors, such as mouth opening and compliance, which are also influencedby comorbidities, play a role. Similarly, observer-related errors, such as scanning experience, can be relevant. Measurement-device-related errors, like measurement accuracy, must also be considered. Most studies measuring models with cleft lip and palate are based on the landmarks established by [PERSON] [19] in 1934 using plaster casts of healthy subjects. These are typical anatomical landmarks on the mucosal surface of the upper jaw that could be related to the underlying bony structures.