*Review* **Dental Images Recognition Technology and Applications: A Literature Review**

**María Prados-Privado 1,2,\*, Javier García Villalón 1, Carlos Hugo Martínez-Martínez <sup>1</sup> and Carlos Ivorra <sup>1</sup>**


Received: 25 March 2020; Accepted: 17 April 2020; Published: 20 April 2020

**Abstract:** Neural networks are increasingly being used in the field of dentistry. The aim of this literature review was to visualize the state of the art of artificial intelligence in dental applications, such as the detection of teeth, caries, filled teeth, crown, prosthesis, dental implants and endodontic treatment. A search was conducted in PubMed, the Institute of Electrical and Electronics Engineers (IEEE) Xplore and arXiv.org. Data extraction was performed independently by two reviewers. Eighteen studies were included. The variable teeth was the most analyzed (*n* = 9), followed by caries (*n* = 7). No studies detecting dental implants and filled teeth were found. Only two studies investigated endodontic applications. Panoramic radiographies were the most common image employed (*n* = 5), followed by periapical images (*n* = 3). Near-infrared light transillumination images were employed in two studies and bitewing and computed tomography (CT) were employed in one study. The included articles used a wide variety of neuronal networks to detect the described variables. In addition, the database used also had a great heterogeneity in the number of images. A standardized methodology should be used in order to increase the compatibility and robustness between studies because of the heterogeneity in the image database, type, neural architecture and results.

**Keywords:** artificial intelligence; dental application; images; detection
