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ORIGINAL RESEARCH Table of Contents   
Year : 2010  |  Volume : 21  |  Issue : 1  |  Page : 112-114
Lenticular card: A new method for denture identification


Department of Prosthodontics, MNR Dental College and Hospital, Sangareddy, Andhra Pradesh, India

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Date of Submission04-Jan-2009
Date of Decision12-May-2009
Date of Acceptance01-Oct-2009
Date of Web Publication27-Apr-2010
 

   Abstract 

Aim: The need for denture marking is important for forensic and social reasons in case patients need to be identified individually. Majority of the surface marking and inclusion techniques are expensive, time consuming, and do not permit the incorporation of large amounts of information. In this article, the method to include a lenticular identification card stood out from the currently available denture marking methods in various ways. The lenticular card stores the patient's information has two or more images that can be viewed by changing the angle of view.
Materials and Methods: The maxillary denture was processed according to the manufacturer's instructions. The lenticular identification card was incorporated in the external posterior buccal surface of the maxillary denture using salt and pepper technique. For testing of durability, denture with the identifier was placed in water for up to 4 months.
Conclusion: The proposed method is simple, cheap, and can store a large amount of information, thus allowing quick identification of the denture wearer. The labels showed no sign of fading or deterioration.

Keywords: Denture identification, lenticular card, forensic dentistry

How to cite this article:
Colvenkar SS. Lenticular card: A new method for denture identification. Indian J Dent Res 2010;21:112-4

How to cite this URL:
Colvenkar SS. Lenticular card: A new method for denture identification. Indian J Dent Res [serial online] 2010 [cited 2020 Aug 13];21:112-4. Available from: http://www.ijdr.in/text.asp?2010/21/1/112/62813
Denture marking is accepted as a means of identifying recovered bodies of those killed in accidents, aviation disasters, and/or cataclysmic holocausts. It also helps in identifying an unconscious person as well as identifying misplaced dentures in geriatric institutions. Various recommendations have been made concerning the importance of denture identification. [1],[2]

To date, several surface marking and inclusion techniques have been reported in the literature. [2],[3],[4],[5],[6],[7],[8],[9],[10],[11],[12],[13],[14],[15] However, a majority of these techniques are expensive, time consuming, and do not permit the incorporation of large amounts of information.

The barcode system [15] and microchip [13],[14] permit storage of large amounts of information, but at the cost of a high price. Also both these systems need to have a hand-held reader or computer to read the data.

Lenticular printing is a technology in which a lenticular lens is used to produce images with an illusion of depth, morph, or the ability to change or move as the image is viewed from different angles. Lenticular printing is a multi-step process consisting of creating a lenticular image from at least two or more existing images, and combining it with a lenticular lens. Each image is sliced into strips, which are then interlaced with one or more of the other images. These are printed on the back of a synthetic paper and laminated on the lens [Figure 1]. The most common materials used for making lenticular images are Poly(vinyl chloride) (PVC), Amorphous Polyethylene Terephthalate (APET), acrylic, spectra, and Polyethylene Terephtalate Glycol (PETG).

This article describes a simple, cheap, and non-time consuming technique in which a lenticular card having a large amount of patient information is inserted into an existing denture.


   Procedure for Denture Marking Top


Lenticular process

A polyethylene terephthalate Lenticular card, 13 mm long by 10 mm wide of 0.5 mm thickness, having the patient's details, was processed by the manufacturer (Seedreams TM ; SBA and Sons, Delhi, India). It consisted of the first flip image of the patient's name, sex, and age, and a second flip image of his/ her address and driving license number, when viewed from a different angle [Figure 2].

Denture marking

The dentures have been processed according to the manufacturer's instructions.

Stage 1: Disinfect, clean, and dry the prosthesis before starting the incorporation process.

Stage 2: Cut a 0.7 mm depression slightly wider than the size of the identifier on the external posterior buccal surface of the maxillary denture using a carbide bur (Zhangjiagang Saimeng Tools Co. Ltd.; Jiangsu, China). Roughen the denture surface around the channel with the carbide bur [Figure 3].

Stage 3: Incorporate the identifier in the channel and salt and pepper clear, auto-polymerizing acrylic resin (Rapid Repair; Dentsply Int'l., York, PA.) around and not on the identifier. Process the denture in a pressurized container (Confident Dental Equipments Pvt. Ltd.; Bangalore, India) with warm water (1008F, 20psi) for 15 to 20 minutes.

Stage 4: Remove excess acrylic resin with an acrylic bur (Zhangjiagang Saimeng Tools Co. Ltd.; Jiangsu, China), and finish and polish the denture, taking care not to touch the surface of the lenticular card, to complete the procedure [Figure 4] and [Figure 5].

Durability checking

For testing the durability, denture with the identifier was placed in water for up to 4 month, for a period of four months. The lenticular card showed no signs of fading or deterioration.


   Discussion Top


In the present article, the method to include a lenticular identification card stood out from the currently available denture marking methods in various ways. The major advantage included storage of larger amounts of information, making effective use of space. Font size could be customized using the word processor program, depending on the size of the lenticular card. Smaller lenticular images could have more flips because the angle of view changed a little from one side to the other.

It is said that smaller images can contain 3 6 or more flips or frames, about 1 second of full-motion video. With more detailed information, a quick identification of a deceased person can be made.

Lenticular images do not require special glasses or devices to read the data. Also, in contrast to the barcode system [15] and microchip, [13],[14] there is no need to have a computer or handheld reader to read the data.

At this time, the cost of processing a lenticular card is just 45 rupees, which is significantly less then the costs of using the microchip and barcode system for denture identification. In addition, the lenticular PET products are in full compliance with the Food and Drug Administration (FDA) requirements for food contact.

As lenticular images are made from synthetic plastic, which is laminated with advanced coating, its durability and waterproofing is remarkable. Laminated lenticular film is protected from the smudging of details by preventing the reaction of the monomer with the photocopier ink. It also does not interfere with the oral function, because of its small size.

The disadvantage of this technique is that the information can never been changed. Second, the procedure can be used only after the denture is processed, as covering the lens surface with acrylic resin during denture processing will not allow the information to be seen clearly. Also incorporation of a lenticular film into the denture requires meticulous handling, such as, not touching the surface of the lens during the finishing and polishing of the denture. It may not withstand a fire. However, this risk can be minimized by placing the strip in the most posterior part of the denture-palatal in the maxillary denture and distal-lingual in the mandibular denture.


   Conclusion Top


A simple and cost-effective means of denture identification and tracking, based on the use of lenticular technology, is described here. The Lenticular identification card can store a large amount of information due to its ability to show two or more different images by changing the angle from which the print is viewed. This technique can be used for both complete and removable partial dentures.

 
   References Top

1.Harvey W. Identity by teeth and the marking of dentures. Br Dent J 1966;121:334-40.   Back to cited text no. 1  [PUBMED]    
2.MacEntee MI, Campbell T. Personal identification using dental prostheses. J Prosthet Dent 1979;41:377-80.  Back to cited text no. 2  [PUBMED]    
3.Todo J, Lukens EM. A technique for placing names in dentures. J Prosthet Dent 1977;37:469-71.  Back to cited text no. 3  [PUBMED]    
4.Toolson LB, Taylor TD. Method of denture identification. J Prosthet Dent 1989;61:114-5.  Back to cited text no. 4  [PUBMED]    
5.Ryan LD, Keller JB, Rogers DE, Schaeffer L. Clear acrylic resin t-bar used in denture identification. J Prosthet Dent 1993;70:189-90.  Back to cited text no. 5  [PUBMED]    
6.Berry FA, Logan GI, Plata R, Riegel R. A postfabrication technique for identification of prosthetic devices. J Prosthet Dent 1995;73:341-3.  Back to cited text no. 6  [PUBMED]    
7.Coss P, Wolfaardt JF. Denture identification system. J Prosthet Dent 1995;74:551-2.  Back to cited text no. 7  [PUBMED]    
8.Ibrahim WM. Denture microlabelling technique. J Prosthet Dent 1996;76:104.  Back to cited text no. 8  [PUBMED]  [FULLTEXT]  
9.Ling BC. Computer-Printer denture microlabelling system. J Prosthet Dent 1998;79:363-4.  Back to cited text no. 9  [PUBMED]  [FULLTEXT]  
10.Reeson MG. A simple and inexpensive inclusion technique for denture identification. J Prosthet Dent 2001;86:441-2.  Back to cited text no. 10  [PUBMED]  [FULLTEXT]  
11.Kamath PG, Kamath VG. Engraved fixed restorations and denture micro-labeling to facilitate identification through forensic dentistry. J Indian Prosthodont Soc 2005;5:79-81.  Back to cited text no. 11    Medknow Journal  
12.Venkat Nag PR, Shenoy KK. Dentures in forensic identification: A simple and innovative technique. J Indian Prosthodont Soc 2006;6:75-7.  Back to cited text no. 12      
13.Rajan M, Julian R. A new method for marking dentures using microchips. J Forensic Odontostomatol 2002;20:1-5.  Back to cited text no. 13  [PUBMED]    
14.Millet C, Jeannin C. Incorporation of microchips to facilitate denture identification by radiofrequency tagging. J Prosthet Dent 2004;92:588-90.  Back to cited text no. 14  [PUBMED]  [FULLTEXT]  
15.Milward PJ, Shepherd P, Brickley MR. Automatic identification of dental appliances. Br Dent J 1997;182:171-4.  Back to cited text no. 15  [PUBMED]    

Top
Correspondence Address:
Shreya S Colvenkar
Department of Prosthodontics, MNR Dental College and Hospital, Sangareddy, Andhra Pradesh
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0970-9290.62813

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    Figures

  [Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5]

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