Abstract
Purpose To evaluate the ultra-morphology of the dentin after irradiation with Er:YAG laser using shorter pulse durations in different protocols by transmission electron microscopy (TEM). The Er:YAG laser is an effective alternative method for hard dental tissue treatment with great acceptability among patients. However, undesirable effects may occur in dental substrate if the correct parameters are not chosen during irradiation protocols, jeopardizing bonding that could result in premature failures. But, before doing bonding tests, it is fundamental the knowledge of the laser action into dentin. It is well known that shorter pulses have less thermal damage due to less heat loss during irradiation; hence, it is primordial to evaluate the performance of shorter pulses in irradiation protocols.
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