The Effect of a Bioactive Oral System and CO Laser on Enamel Susceptibility to Acid Challenge.

This study evaluated the structural changes of enamel treated by the Regenerate system and carbon dioxide (CO) laser against acid challenge. Thirty human enamel slabs were prepared and assigned into three groups: Group I: untreated (control); Group II: treated with the Regenerate system; and Group III exposed to CO laser. All specimens were subjected to an acid challenge (pH 4.

A Self-Adapting, Pixelized Planar Antenna Design for Infrared Frequencies.

Infrared antennas with reconfigurable characteristics offer several advantages in the medical, military, telecommunication and energy harvesting areas, while their design and implementation is a particularly challenging task for the researchers. This paper proposes a pixel antenna, designed for mid-infrared frequencies with a bandwidth more than 25 THz, consisting of 3 × 3 square metallic planar patches. Bolometer-based switches are placed between the adjacent pixels in order to obtain the adaptable characteristics, optimized for the incoming infrared radiation.