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Denture barcoding in forensic dentistry: A future option

Neurodegenerative disorders are commonly seen in elderly individuals. Parkinson’s disease (PD) is the most common example with memory loss, lack of logic, reasoning and analytical thinking. In this case report simple method of 2D Bar code technique of denture marking has been explained which will not only useful in patients with memory loss but it is very helpful in identifying the individuals in case of natural calamities like floods, earthquake, tornedo, state of unconsciousness and accidents. Such patients can be traced easily by denture barcoding. This technique is a major breakthrough in the field of forensic dentistry.

Type III dental stone (Kalabhai Dental Pvt. Ltd., Mumbai, India) was used to pour the primary cast.
S i n g l e -s t e p b o r d e r m o l d i n g wa s d o n e u s i n g polyvinyl siloxane impression material of putty consistency(Aquasil, DENTSPLY/Caulk). The final impression was recorded using light-bodied polyvinyl siloxane impression material (Aquasil, DENTSPLY/ Caulk) [ Figure 3].
Jaw relation was recorded tentatively because of poor neuromuscular control resulting in uncoordinated mandibular movements and variable centric relation. Hence, monoplane teeth were selected [ Figure 4]. Try-in was done.

Incorporation of 2-D bar code
A 2-D bar code with details such as name, gender, age, address, phone number, and medical history was generated with a code generator (QR2, Kaywa-Code Generator, beta v1.000, Kaywa AG, Zurich, Switzerland). • The 2-D bar code label of 10 × 10 mm in size was printed on paper and laminated • The laminated code was then embedded between thin films of clear autopolymerizing acrylic resin (DPI-RR Cold Cure DPI Products and Services Limited, Mumbai, India) [ Figure 5] • The bar code was positioned on the palatal surface of the maxillary denture after the trial closure, and then curing was done in a conventional manner (prefabrication technique) [ Figure 6] • For the mandibular denture, the label was positioned in a recess created 1 mm deep on the distolingual flange of the denture. Note that the marker may fail to decode if placed on a deep curved surface (postfabrication technique) [ Figure 7] • The recess was filled with clear autopolymerizing acrylic resin before trimming and polishing [ Figure 8] • A code decoder (i-nigma, v3.10.02, 3GVision, Yehuda, Israel) enabled mobile camera was held against the label for the code to be deciphered [ Figure 9] • After a few seconds the recognized code was translated into text on a mobile screen displaying the patient's data [ Figure 10] • Denture insertion was done [ Figure 11].

Discussion
It is a well-documented practice to mark dentures with surface inscription and inclusion markers. [4] The identification of dentures may also be needed in places such as senior citizen centers or hospitals. [7] It is obvious that only marked dentures can reveal the positive identity of a person when all other methods fail to do so. This in itself is reason enough to justify the implementation of marking of dentures. [8,9]        The proposed method allows individual information to be recorded easily in dental offices and private dental laboratories.
Individuals suffering from Parkinson's disease, Alzheimer's disease, or any neurodegenerative disorders resulting in dementia are prone to wandering. [10] To protect these vulnerable individuals a 2-D bar code can be incorporated into their prostheses.
Labeling of dentures is recommended by most international dental associations and forensic odontologists. [11,12] In the near future personal wander monitoring technology falling under two categories, namely, radio frequency identification (RFID) and global positioning systems (GPS) can be incorporated into different kinds of prosthesis for easy tracking of patients with such neurological disorders. [13] The prefabrication techniques are more permanent, but induce points of weakness unless they are bonded to the acrylic resin. [1] Thus it is a technique-sensitive procedure.
On the other hand, postfabrication techniques are quicker and easier but they are not permanent and may fade after subsequent use of the denture compared to the prefabrication techniques.
In this clinical trial both pre and postfabrication techniques were followed and the labels were inserted in a preparation site, which is located in the flattest portion on the cameo surfaces of the distolingual flange of the mandibular denture and the palate of the maxillary denture. [4,5] Denture markers should be positioned in such areas where they do not interfere with either the esthetics or the function of the denture. These areas are also unaltered during postinsertion adjustments and routine wear and tear or relining procedures. [14] Hence these areas were considered for the positioning of a 2-D bar code.

Conclusion
Denture barcoding plays an important role in identifying the person in case of an accident, dementia, state of unconsciousness, missing individuals, or in identifying dead bodies in natural calamities. A variety of denture marking systems have been reported in the literature. The present clinical report describes the incorporation of a 2-D bar code into the prostheses in a patient with a neurodegenerative disorder. This procedure is simple, reliable, and cost effective, thus paving a new path for identification in forensic dentistry.

Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.