Influence of Various Laser Surface Modifications on SBS of Titanium and Zirconium Oxide Substructures

Abstract

In prosthodontics, to increase the bonding of metals with porcelain by several means including laser surface treatments is still an important research topic. The current study was undertaken to evaluate the influence of surface treatment with Ho:YAG, Er:YAG, and Nd:YAG lasers on the shear bond strength (SBS) of low fusion dental porcelain to titanium and zirconium oxide substructures. Titanium (n=70) and zirconium oxide (n=70) specimens were categorized into 7 study groups (n=10): sandblasting, Er:YAG 1.5W and 2.5W, Nd:YAG 1.5W and 2.5W, and Ho:YAG 4W and 10W. Their surface morphology was examined with under scanning electron microscopy (SEM) after surface treatment. After application of low fusion dental porcelain, the SBS test was performed applying a universal testing machine. In the titanium specimens, the SBSs of the Nd:YAG laser 2.5W and 1.5W were significantly higher than those of the sandblasting and other lasers, respectively (p<0.05); In the zirconium oxide specimens, the SBSs of the sandblasting, Nd:YAG 1.5W and Nd:YAG 2.5W lasers were significantly higher than those of the other lasers, respectively (p<0.05); In the titanium specimens, Er:YAG 1.5W, Nd:YAG 2.5W, and Ho:YAG 10W lasers provided significantly higher SBSs compared to those in the zirconium oxide specimens (p<0.05). To increase SBS of low fusion porcelain with titanium and zirconium oxide substructures, Nd:YAG laser is more successful compared to Er:YAG and Ho:YAG lasers. The laser applications provide different SBS results although there are no obvious differences among their surfaces by SEM; this requires further research in order to clarify the mechanism of these differences.

Effect of Fiber Laser Irradiation on the Shear Bond Strength between Acrylic Resin and Titanium

“…Additionally, this discrepancy could be attributed to a difference in the type of laser: we used a nanosecond fiber laser, whereas the cited study used an Nd:YAG laser. In their study, Saygın et al [39] revealed that an Nd:YAG laser produced better results, an Er:YAG laser produced similar results, and a Ho:YAG laser produced lower results compared to sandblasting. As it can be clearly inferred, the type of laser affects the bond strength.…”

Influence of Sandblasting and Chemical Etching on Titanium 99.2–Dental Porcelain Bond Strength

“…Many works have also been done on the titanium surface treatment, to obtain an accurate bonding strength of the metal-low-fusing porcelain system. Some of them concern thermal treatment, oxidation [ 16 , 17 , 18 ], modification by chemical etching [ 19 , 20 , 21 , 22 , 23 ], and laser treatment [ 24 , 25 , 26 , 27 ].…”