title: AnIn vitroevaluation of the reliability of QR code denture labeling technique.
abstract: BACKGROUND
  Positive identification of the dead after accidents and disasters through labeled dentures plays a key role in forensic scenario. A number of denture labeling methods are available, and studies evaluating their reliability under drastic conditions are vital.
  
  
  OBJECTIVE
  This study was conducted to evaluate the reliability of QR (Quick Response) Code labeled at various depths in heat-cured acrylic blocks after acid treatment, heat treatment (burns), and fracture in forensics. It was anin vitrostudy.
  
  
  METHODS
  This study included 160 specimens of heat-cured acrylic blocks (1.8 cm × 1.8 cm) and these were divided into 4 groups (40 samples per group). QR Codes were incorporated in the samples using clear acrylic sheet and they were assessed for reliability under various depths, acid, heat, and fracture. Data were analyzed using Chi-square test, test of proportion.
  
  
  RESULTS
  The QR Code inclusion technique was reliable under various depths of acrylic sheet, acid (sulfuric acid 99%, hydrochloric acid 40%) and heat (up to 370°C). Results were variable with fracture of QR Code labeled acrylic blocks.
  
  
  CONCLUSIONS
  Within the limitations of the study, by analyzing the results, it was clearly indicated that the QR Code technique was reliable under various depths of acrylic sheet, acid, and heat (370°C). Effectiveness varied in fracture and depended on the level of distortion. This study thus suggests that QR Code is an effective and simpler denture labeling method.
authors.affiliation: Department of Prosthodontics, Tagore Dental College and Hospital, Chennai, Tamil Nadu, India.
authors.forename: Sindhu
authors.initials: S
authors.lastname: Poovannan
authors.affiliation: Department of Prosthodontics, Saveetha Dental College and Hospital, Saveetha University, Chennai, Tamil Nadu, India.
authors.forename: Ashish R
authors.initials: AR
authors.lastname: Jain
authors.affiliation: Department of Prosthodontics, Tagore Dental College and Hospital, Chennai, Tamil Nadu, India.
authors.forename: Cakku Jalliah Venkata
authors.initials: CJ
authors.lastname: Krishnan
authors.affiliation: Department of Periodontics, Tagore Dental College and Hospital, Chennai, Tamil Nadu, India.
authors.forename: Chitraa R
authors.initials: CR
authors.lastname: Chandran
keywords: Acrylic sheet; Quick Response code; forensics; hydrochloric acid; labeled denture; positive identification; sulfuric acid