Background: In prosthodontics, achieving esthetic success requires precise shade matching of restorations to natural teeth. This study evaluated the shade-matching abilities of fourth-year dental students using different tools and conditions in laboratory (LB) and clinical (CL) settings. Methods: In the LB setting, students matched blinded shade tabs to the VITA classical shade guide under natural daylight (ND), artificial light (AL), and a polarized filter (PF). In the CL setting, they determined the shades of patients’ central incisors using the same conditions. Participants also completed a questionnaire about their experience. Results: Quantitative analysis showed better shade matching in the LB setting, particularly with the PF (52% correct), compared to ND (50%) and AL (43%). In the CL setting, overall accuracy dropped to 32% across all conditions. No results were statistically significant. Qualitative feedback revealed that students found the spectrophotometer to have improved their accuracy and reliability compared to the ND and AL conditions. Conclusions: This study highlights the importance of incorporating technology as a validation tool in dental practice. Leveraging tools like spectrophotometers may enhance shade-matching accuracy, streamline processes, and improve patient satisfaction while balancing traditional methods with technological advancements.

Background: Rheumatoid arthritis (RA) is a chronic autoimmune disease characterized by systemic inflammation, synovial hyperplasia, and progressive joint destruction. Periodontitis, a chronic inflammatory disease affecting the supporting structures of teeth, has been increasingly recognized as a potential contributor to RA pathogenesis. Evidence suggests that both conditions share common immunological mechanisms and microbial triggers. This review summarizes the data linking RA with periodontitis, with particular focus on shared pathogenic pathways, microbial triggers, immune system alterations, and clinical relevance. Methods: Experimental, epidemiological, and clinical studies were evaluated to explore biological and clinical links between periodontitis and RA. Special emphasis was placed on the mucosal origins of RA, bacterial-mediated citrullination, autoantibody formation, and the role of the complement system. Results: Available epidemiological data indicate that individuals with RA present higher prevalence and greater severity of periodontitis. Periodontal pathogens, such as Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans, contribute to immune dysregulation through citrullination, and subsequent production of anti-citrullinated protein antibodies (ACPAs), a hallmark of RA. Both diseases are characterized by chronic, uncontrolled inflammation, amplified by complement activation and neutrophil hyperactivity. Clinical evidence suggests that non-surgical periodontal therapy may reduce systemic inflammatory markers and improve RA disease activity. Conclusions: The relationship between RA and periodontitis appears to be bidirectional and the recognition of this interaction supports closer collaboration between rheumatologists and dental professionals. Future studies are required to clarify causality and determine whether management strategies can influence patient outcomes.