In Vitro Study to Check the Viability of Fixed Partial Dentures with Built-in Passive RFIDs- A Forensic Dentistry Tool ZC08-ZC12
Dr. R Venkat,
Reader, Department of Prosthodontics, SRM Dental College, Bharathy Salai, Ramapuram, Chennai-600089, Tamil Nadu, India.
Introduction: Lack of quick and easy techniques to handle human identification devices during mass disasters like Indian Ocean earthquake and Tsunami (2004), Kedarnath landslide (2013), Kolkata market fire (2013), Chennai flood (2015), and Kerala flood (2018), emphasised on the necessity to develop this tool.
Aim: To develop a simple, yet reliable tool that can serve the purpose as a potential forensic record as well as patient data retrieval system.
Materials and Methods: In vitro experiment was carried out by incorporation of passive radio frequency identification microchips into a cavity on lingual surface of 3 unit metal ceramic fixed partial denture models and sealing the cavity using ceramic repair kit. These thirty six fixed partial denture samples were divided into 12 samples of each three groups as group 1 -100°C, group 2 -200°C and group 3 -300°C. Viability of microchips before and after heat treatment using RenfertMagma Pre heating furnace of each group with a temperature holding time of 15 minutes was assessed using radio frequency identification device reader and values were computed. Statistics was computed using Pearson chi-square analysis. Scanning Electron Microscopic (SEM) analysis at a resolution of 500 µm was carried to study surface characteristics before and after heat treatment.
Results: In group 1 (100°C) and group 2 (200°C) microchips were found to be 100% viable before and after heat treatment. In case of group 3 (300°C), 100% of samples failed to read out after heat treatment. Since the values obtained in all the three groups before firing was constant; no statistical difference was computed. Likewise cross tabulation of values between before and after firing were constant; so no statistical differences were computed. Pearson chi-square analysis of after firing group values computed p-value <0.001 which is statistically significant. SEM analysis revealed disrupted composite-ceramic interface, disintegrated microchips with carbonization in group 3 samples.
Conclusion: Within constraints, successful development of limited heat resistant (up to 200°C) Radio Frequency Identification Device (RFID) incorporated fixed partial dentures was established. Further prospective studies are needed to improvise the heat resistance of this device.