Effect of Composite Resin Core Translucency and Shade on the Accuracy of Intraoral Scanner: An In Vitro Study

shade selection and achieving closer color harmony with natural dentition.5 The literature has shown that single-shade composite resins have demonstrated variable translucency parameters depending on background shade and material composition, underscoring the complexity of optical behavior in contemporary restorative materials.6 However, the optical characteristics of composite resins-particularly their translucency and shade-may interact variably with the optical acquisition systems used in IOS devices.This interaction poses potential challenges to the accuracy and reliability of digital impressions.7 Translucency, defined as the material's ability to transmit light while diffusing it, plays a critical role in the visual blending and esthetic integration of restorative materials.By allowing light to penetrate the surface and reflect from underlying structures, IntroductIonThe field of restorative dentistry is undergoing a significant transformation, with a marked shift toward fully digital workflows.Central to this evolution is the adoption of intraoral scanners (IOS), which have become indispensable tools for capturing accurate digital impressions. 1 Digital impression technologies have transformed modern dental workflows, with IOSs emerging as a prominent alternative to conventional elastomeric impressions.These technologies play a pivotal role in enhancing the precision, efficiency, and predictability of prosthodontic treatments, particularly in fixed restorations and implant-supported prostheses.1,2 IOSs offer enhanced accuracy, reduced chairside time, greater patient comfort, and seamless integration with computer-aided design/computeraided manufacturing (CAD/CAM) workflows.2 A systematic review with meta-analysis conducted through December 2024 comparing digital and conventional impressions in full-arch clinical scenarios confirmed that digital impression accuracy continues to be a topic of active research, with standardization of analytical protocols remaining a key methodological concern.3 Composite resins are frequently employed in the reconstruction of anterior core buildups due to their favorable mechanical properties, ease of handling, and superior esthetic outcomes.These materials are formulated to closely mimic the optical behavior of natural dental tissues, facilitating seamless integration with surrounding dentition.4 Contemporary biomimetic composite resins have been developed with advanced optical technologies specifically aimed at simplifying 1-