Ayuso-Montero R, et al. - In this cross-sectional study involving 31 dentate adults, researchers identified the reliability of T-scan and 3D intraoral scan techniques for the evaluation of the occlusal contact area (OCA) compared to the occlusal registration and also the validity of the techniques. The intraclass correlation coefficient (ICC) and the validity of Pearson correlations assessed the accuracy of the test-retest. Using the T-scan, the highest OCA values and the lowest using the 3D surface scan were acquired. According to findings, T-scan is a reliable OCA measurement method, but the 3D surface scan is not. Occlusal registration demonstrated a high validity.