*2.1. Review Questions*

(1) What are the neural networks used to detect teeth, filled teeth, caries, dental implants and endodontic teeth?


### *2.2. Search Strategy*

An electronic search was performed in MEDLINE/PubMed, the Institute of Electrical and Electronics Engineers (IEEE) Xplore and arXiv.org databases, up until 17 March, 2020. Most journal manuscripts in the medical field were published in MEDLINE/Pubmed. IEEE Xplore publishes articles related to computer science, electrical engineering and electronics (https://ieeexplore.ieee.org/Xplore/ home.jsp). Among others, arXiv.org is an electronic archive for scientific manuscripts in the field of physics, computer science, and mathematics.

The search strategy used is detailed in Table 1.


**Table 1.** Search strategy.

*2.3. Study Selection*

M.P.-P. and J.G.-V. performed the bibliography search and selected the articles that fulfilled the inclusion criteria. Both authors extracted independently the results. The references of the articles included in this study were manually reviewed.
