Abstract
We have developed a new monitoring system to detect thermal damages in cavity preparation withan Er: YAG laser. The system consists of an optical fiber, a spectroscope and MOS linear image sensorwhich has high sensitivity and response speed. Emission line spectra of 560 nm and 590 nm in wavelength wereobserved when tissue charring, thermal cracks and deposition of molten materials were produced by theirradiation of laser beam. The intensity of the emission increased as the laser energy became higher. Theemission line spectra were not observed when the cavities were perforated without thermal damage.
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