Application of the Laser Microspectral Analysis in Dentistry: Mikroleakage evaluation in fixed partial dentures

METHODS: The laser microspectral analysis device LMA-1 (Carl Zeiss, Jena), equipped with a diffraction spectrometer PGS-2 (Carl Zeiss, Jena). This laser have a resonator with glass doped Nd3+. The output energy of the laser is 0.5-1.2 Joule/pulse λ=1060 nm. The LMA-1 system has mirror lens 40x, used to visualise the explored surface, which can be interchanged with 10 X lens, used to focus the laser pulse. The energy of the pulse was taken so that the diameter of the crater was around d = 50 µm and the depth of h = 35 µm. The corresponding voltage of the flash lamp is around 2 kV. For this, correspond a mass of vapors of around m= 0.1 µg. The voltage on the electrodes can be taken in the interval 0.5 – 3 kV. For the electric discharge it was used two graphite electrodes. The image of the electric discharge was focused on the aperture of the spectrograph using a collimating system. The input aperture of the spectrograph was taken of 10 µm. The energy of