Qraypen In Residual Caries Detection And Cavity Disinfection

Residual bacterial activity after selective caries removal may compromise restoration longevity. QrayPen, a fluorescence-based device, enables real-time detection of red fluorescence (ΔR) and maximum red fluorescence (ΔRmax)—markers of bacterial activity. This case series explores QrayPen’s utility in identifying residual caries and evaluating the antibacterial effect of 2% chlorhexidine digluconate applied as a cavity disinfectant. Five adult patients with active dentinal caries underwent selective caries removal. QrayPen was used to measure ΔR and ΔRmax before and after chlorhexidine application. Measurements were standardized in a dark environment with consistent drying and probe positioning. Lesions were also evaluated using ICDAS II, Nyvad criteria, and ICCMS radiographic scores. All five cases showed detectable fluorescence post-caries removal; post-disinfection readings indicated reduced bacterial activity. The findings suggest QrayPen can identify residual bacterial presence undetectable by conventional visual-tactile methods. The observed decrease in ΔR and ΔRmax values after chlorhexidine application supports its effectiveness as an adjunctive diagnostic tool. This dual use may enhance decision-making in minimally invasive restorative protocols by confirming both cleanliness of the cavity and efficacy of disinfection. QrayPen may aid clinicians in verifying caries removal and evaluating cavity disinfection in real time. Its integration into routine practice could support more conservative and evidence-based restorative treatments, improving long-term outcomes.