Author/Authors :
Dehghani, Ali Department of Oral and Maxillofacial Pathology - Biomaterial Research Center - School of Dentistry - Shiraz University of Medical Sciences, Shiraz , Khosropanah, Hengameh Department of Oral and Maxillofacial Pathology - Biomaterial Research Center - School of Dentistry - Shiraz University of Medical Sciences, Shiraz , Rezai, Mostafa Department of Oral Medicine - School of Dentistry - Shiraz University of Medical Sciences, Shiraz , Moradi, Mahsa Faculty of Dentistry - International Branch of Shiraz University of Medical Sciences, Shiraz , Moradi, Ahmad Private practice, Shiraz
Abstract :
Dentinal hypersensitivity (DH) is
one of the most painful chronic problems reported in
dental offices. Various methods have been applied for
the treatment of DH. However, majority of them are
either ineffective or last for a short period of time. It
has been reported that lasers, particularly Neodymium-doped: Yttrium Aluminum Garnet laser (Nd: YAG),
can be helpful in the treatment of this disease. However, systematic reviews have shown that the available evidence for its effectiveness is weak. The aim of
this study was to evaluate the Nd: YAG laser-prepared
dentine surface with different powers and energies.
Materials and methods: Fifteen extracted human molars were randomly divided into five groups
receiving different powers and energies of Nd:YAG
laser (Group A: power: 0.7 W, energy: 70 mJ; Group
B: power: 0.9 W, energy: 90 mJ; Group C: power: 1.1
W, energy: 110 mJ; Group D: power: 1.3 W, energy:
130 mJ; and Group E: power: 1.5 W, energy: 150 mJ)
in three pulse modes. The surfaces of the specimens
were then studied using scanning electron microscopy (SEM).
Results: With output power of 0.7 W in single, double and triple radiation modes, sealed dentinal tubules and absence of smear layer were observed. The
surfaces prepared by using higher powers of 0.9, 1.1,
1.3, and 1.5 W showed the same features as those
prepared with 0.7 W power in single and double pulse
modes. In addition, carbonization centers were observed when single pulse mode with power of 1.5 W
was employed.
Conclusion:All combinations of power and energy tested in this study were found to have produced
sealing of the dentinal tubules. However, 0.7 W power in double and triple radiation modes is suggested
to be the best option for the clinician, due to having
the lowest energy, fewer side effects and lower risk
of physical dangers, as well as decreasing the occurrence of unwanted carbonizations. Experimental and
clinical studies, especially randomized clinical trials,
comparing the effects of Nd: YAG lasers with conventional methods are recommended.
