## 4 Discussion  
Previous studies [16; 17; 18] concluded that labeling dentures using various methods--surface related or by engraving--have certain limitations, in that they are applied after the completion of the technological stage of denture manufacturing. The information can be lost over time due to the action of external and internal environmental factors to which the body is subjected, and the long-term durability of the information is uncertain [17; 18]. \begin{table}
\begin{tabular}{l c c c c} \hline \hline \multirow{2}{*}{**Sample Type**} & \multicolumn{4}{c}{**Liquid Media**} \\ \cline{2-5}  & **Sea Water** & **Fresh Water** & **Alcohol (40\%)** & **HCl (0.2\%)** \\ \hline Acrylic layer/NFC-tag/acrylic & 4/4 & 4/4 & 4/4 & 2 */4 \\ layer/PINK & 4/4 & 4/4 & 4/4 & 4/4 \\ \hline Acrylic layer/NFC-tag/acrylic & 4/4 & 4/4 & 4/4 & 4/4 \\ layer/TRANSPARENT & 4/4 & 4/4 & 4/4 & 4/4 \\ \hline \hline \end{tabular} Note. * Samples are not readable due to an error in the technological stage of manufacturing.  
\end{table} 
Table 2: Number of samples read (with the NFC reader application) after 3 months in storage in different environments. Figure 7: **(a)–**Pink acrylic sample denture marked with NFC-tag alone that migrated from the insertion site; **(b)–**Pink acrylic marked with a NFC-tag and Aerogel that migrated from the insertion site. Moreover, these labeling methods can create discomfort for patients from a tactile as well as an aesthetic point-of-view. Dentures labeled with NFC-tags alone or embedded in Aerogel provide patient comfort without causing aesthetic or tactile disturbances due to the extremely small size of the NFC-tags and the transparency of the Aerogel, being embedded in visually inaccessible areas [23; 24; 25]. Intelligent materials such as NFC-tags and Aerogel have not been studied before from a technological or experimental point-of-view for their use in the medical or forensic field. They were found to be compatible with each other without altering the properties for which they were chosen for in this study. The experiment showed that NFC-tags are likely to be resistant over time in various environments. Therefore, inputting relevant personal data (name/age/social security number/medical history/address/emergency contact phone number) on the NFC-tag could significantly facilitate efforts in identifying decayed or vastly damaged cadavers [19; 20]. There are no data in the literature on the methods or techniques for handling Aerogel or Aerogel in combination with NFC-tags, much less on their incorporation in dental work, which is why this experimental study provides objective new information supported by positive results. This study on the embedding of these materials in the structure of acrylic dentures, and their exposure for a significant period to various internal and external environments, provides an innovative solution. Testing the incorporation of these materials (NFC-tags and Aerogel) into dentures at an experimental level for use in forensic odontology identification has been successful and has opened a field for research and implementation of techniques on ways to manipulate these materials into dentures and possibly, in the future, in the very teeth themselves [21; 22]. The effectiveness of labeling with NFC-tags alone or NFC-tags embedded in Aerogel layers is demonstrated as early as the technological stage of denture polymerization, in which the physical properties remain unchanged. Exposure of Aerogel and NFC-tags to environments unsuitable for data preservation even for long periods of time has shown that these materials do not changed their physical properties, thus highlighting the value of their use in the marking of dentures for forensic odontology identification purposes. There are several possible limitations in implementing the technology we are proposing. The first one is related to the manual inclusion of the NFC-tag in the technological process of making the sample dentures [24].