Evaluation of 532 nm laser effect on dental enamel dissolution : in vitro study

Abstract EN

Purpose : to evaluate the effect of various Nd : YAG frequency doubled laser parameters on the acid dissolution and the progression of in vitro caries like lesions in human enamel.

Materials and Methods: Human extracted caries free upper first premolar teeth were collected for this study.

The irradiated teeth were divided into two groups.

The first group was irradiated with continuous Nd : YAG laser radiation, and the second group was irradiated with chopped Nd : YAG laser radiation.

For the first group, power and exposure time were changed while for the second group power and number of pulses were changed.

The spot diameter was kept constant for all the samples.

Results : using 1.5 W and 3 seconds (exposure time), best results among the continuous group were obtained, while in the chopped group using 1.5 W and 3 pulses gave better result.

The percent reduction in lesion depth in this study was up to 26 % in the continuous group, whereas in the chopped group was up to 44 %.