DENTAL IMPRESSIONS AND GYPSUM MODEL SCANNING ACCURACY USING A LASER SCANNER ARE COMPARED

This article presents a comparative analysis of the dimensional accuracy of digital models obtained through
direct laser scanning of silicone impressions and scanning of Type IV and Type V gypsum models used in prosthetic
dentistry. A calibrated Johanssen gauge block with a nominal reference distance of 7 mm was employed as the
experimental standard. The results demonstrate that digital models derived from Type IV super-gypsum (Elite Rock)
exhibit the highest dimensional accuracy. Direct scanning of impressions showed slightly greater deviations, primarily
attributed to the application of anti-glare spray required for optical scanning of reflective silicone surfaces. While direct
impression scanning is clinically viable and offers workflow efficiency, its accuracy remains marginally inferior to gypsumbased
digitization for high-precision prosthetic applications. The findings emphasize the importance of material selection
and scanning methodology optimization in modern CAD/CAM dental workflows