Effect of Nd:YAG laser on dentinal bond strength

Douglas N. Dederich D.D.S.; John Tulip

doi:10.1117/12.44000

1 May 1991 Effect of Nd:YAG laser on dentinal bond strength

Douglas N. Dederich D.D.S., John Tulip

Proceedings Volume 1424, Lasers in Orthopedic, Dental, and Veterinary Medicine; (1991) https://doi.org/10.1117/12.44000
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

Carbon dioxide laser energy has been shown to possess the ability of enhancing dentinal bond strength of a recently introduced dentinal bonding agent. It is presently unclear as to whether Nd-YAG laser energy can have the same effect. The objective of this study was to measure the effect of Nd-YAG laser pretreatment of dentin on the dentinal bond strength. Thirty extracted molars were mounted vertically in an acrylic base, to a depth of their cervical lines. The bottom of the base was flattened, and a plane perpendicular to this base was ground into one buckle surface of each molar. This exposed a dentin surface 6 mm or greater in diameter. These teeth were randomly distributed into two groups, with 15 teeth per group. Brass rings of approximately 5 mm in diameter were placed on these flat surfaces, and filled using Scotchbond 2 (3M) and P-50 (3M) composite material as per manufacturer's instructions. The experimental group was treated identically to the control group with the exception of laser treatment of the dentin at 51 Watts/cm2 for 0.2 sec. before application of Scotchbond 2. After curing, these restorations were shear tested using an Instron machine at 0.1 in/min. crosshead speed. The mean shear strength and standard deviation for the control group were 1.29, 1.74 MPa, and for the irradiated group 1.05, and 1.07 MPa, respectively. Students t-test found no significant difference (P equals 0.2914) between the groups. It does not appear that, at these powers, the Nd-YAG laser possesses the ability to enhance the bond strength of Scotchbond 2 dentinal bonding agent.

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Douglas N. Dederich D.D.S. and John Tulip "Effect of Nd:YAG laser on dentinal bond strength", Proc. SPIE 1424, Lasers in Orthopedic, Dental, and Veterinary Medicine, (1 May 1991); https://doi.org/10.1117/12.44000

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