Objective: To evaluate the combined occluding effect of fluor protector and Nd:YAG Laser irradiation on human dentinal tubules.
Methods: Twenty-four dentin specimens with exposed dentinal tubule orifices treated by 37% H3PO4 were randomly divided into four groups. Group B, C and D were vanished by fluor protector, group A served as a control. Group D was lased by Nd:YAG laser. Group C and D were brushed with normal force.
Results: Under SEM, group A showed numerous exposed dentinal tubule orifices, the diameter of which is 2-3 microns. Group B showed closure of dentinal tubule orifices. Group C showed that most of the fluor protector were brushed away and group D showed over 80% of the dentinal tubule orifices were occluded.
Conclusions: Fluor protector combined with Nd:YAG laser can make most of the dentinal tubule orifices occluded even after brushed.