IADR Abstract Archives
Heat Behavior of Printed QR Codes for Denture Marking
Objectives: To evaluate the feasibility of printed QR codes after being subjected to extreme heat conditions to be implemented as Denture identification Marking Methods (MMPD).
Methods: The behavior of four different types of papers with printed QR codes were analyzed: I) Common cellulose, II) Fiberglass filter, III) Extralong hydroxyapatite Nanofiber, IV) Polyolefin / Silica. These papers were, exposed for 1 hour to 100°, 200°, 400°, 600°, 800° and 1000°C in a heat muffle. Each sample was analyzed morphologically and QR codes were scanned with 3 different mobile devices. Thermogravimetric analysis (ATG) was carried out.
Results: Physical alterations in the four types of paper were detected, the most noticeable in II, with greater curl and brittleness, and brown to gray discoloration; this paper had loss of stability at 600°C, going from papyraceous to amorphous crystalline; papers III and IV were stable at all temperatures. The readings of the QR codes were positive in 33.33% in the I, 50% in the II, 70.37% in the IV, being 100% in the III. The ATG revealed that the four papers presented continuous decomposition curves (average of 15'15 "at a temperature of 662.5 ° C). The high results obtained by paper III stood out (decomposition time from 18' to 900°C).
Conclusions: The composition of the paper, its stability over time and subjection temperatures, should be factors to be considered when MMPD are suggested. Although the use of labeled papers has been recommended as MMPD , the use of QR codes as reservoirs of information even after incineration represents anew paradigm in forensic identification. This line of research intends to continue with the analysis of the chemical relationship between papers and denturematerialswhile exposed to incineration situations, in order to be able to implement them as MMPD adjusted to all American Dental Association recommendations.
Methods: The behavior of four different types of papers with printed QR codes were analyzed: I) Common cellulose, II) Fiberglass filter, III) Extralong hydroxyapatite Nanofiber, IV) Polyolefin / Silica. These papers were, exposed for 1 hour to 100°, 200°, 400°, 600°, 800° and 1000°C in a heat muffle. Each sample was analyzed morphologically and QR codes were scanned with 3 different mobile devices. Thermogravimetric analysis (ATG) was carried out.
Results: Physical alterations in the four types of paper were detected, the most noticeable in II, with greater curl and brittleness, and brown to gray discoloration; this paper had loss of stability at 600°C, going from papyraceous to amorphous crystalline; papers III and IV were stable at all temperatures. The readings of the QR codes were positive in 33.33% in the I, 50% in the II, 70.37% in the IV, being 100% in the III. The ATG revealed that the four papers presented continuous decomposition curves (average of 15'15 "at a temperature of 662.5 ° C). The high results obtained by paper III stood out (decomposition time from 18' to 900°C).
Conclusions: The composition of the paper, its stability over time and subjection temperatures, should be factors to be considered when MMPD are suggested. Although the use of labeled papers has been recommended as MMPD , the use of QR codes as reservoirs of information even after incineration represents anew paradigm in forensic identification. This line of research intends to continue with the analysis of the chemical relationship between papers and denturematerialswhile exposed to incineration situations, in order to be able to implement them as MMPD adjusted to all American Dental Association recommendations.