Introduction: Recently, digital intraoral scanners (IOS) can determine natural tooth color. However, there is paucity of information concerning shade determination of a new intraoral scanner that uses triangulation combined with bidirectional reflectance distribution function (BRDF).
Objectives: Assessment of accuracy and repeatability of CS3700 IOS integrated with BRDF compared to reference EasyShade spectrophotometer (VS).
Material and methods: Twenty participants with vital intact 4 maxillary incisors were recruited in this study. A total of 80 tooth surfaces were scanned by CS3700 IOS. Shade values obtained in Vita classical and Vita 3D master. Vita EasyShade spectrophotometer was used to determine the shade of tooth surfaces to act as a reference device to measure the accuracy of the IOS. The agreement percent of shade values and Lab values was calculated. For the repeatability assessment, all scanning procedures were performed twice by IOS and VS with one month interval.
Results: The agreement of CS3700 was 50.6% as Vita Classical values when compared to VS. The agreement as 3D Master values was 28.6% automatically and 34.5% manually. The mean ∆E between CS3700 and VS was found to be between 6 and 6.9. Repeatability of CS3700 was 71.4% automatically and 75% manually in Vita Classical values. Repeatability of CS3700 as 3D Master was 54.8% automatically and manually. Repeatability of VS was 73.8% as Vita Classical and 69% as 3D Master values.
Conclusions: The accuracy of CS3700 IOS in tooth shade determination was considered poor to fair when compared to spectrophotometer. Both instruments revealed moderate to good repeatability.