Effect of laser welding on the titanium composite tensile bond strength

Brazilian Dental Journal

Rodrigo Galo¹  Ricardo Faria Ribeiro¹  Renata Cristina Silveira Rodrigues¹  Valéria De Oliveira Pagnano¹  Maria Da Glória Chiarello De Mattos¹ 

[1] ,University of São Paulo Ribeirão Preto Dental School Department of Prosthodontics and Dental MaterialsRibeirão Preto SP ,Brazil

关键词: laser welding;    titanium;    composite resin;    shear bond strength;   

DOI  :  10.1590/S0103-64402009000500008

来源: SciELO

【 摘 要 】

The aim of this study was to analyze the shear bond strength between commercially pure titanium, with and without laser welding, after airbone-particle abrasion (Al2O3) and 2 indirect composites. Sixty-four specimens were cast and divided into 2 groups with and without laser welding. Each group was divided in 4 subgroups, related to Al2O3 grain size: A - 250 µm; B - 180 µm; C- 110 µm; and D - 50 µm. Composite rings were formed around the rods and light polymerized using UniXS unit. Specimens were invested and their shear bond strength at failure was measured with a universal testing machine at a crosshead speed of 2.0 mm/min. Statistical analysis was carried out with ANOVA and Tukey's test (α=0.05). The highest bond strength means were recorded in 250 µm group without laser welding. The lowest shear bond strength means were recorded in 50 µm group with laser welding. Statistically significant differences (p<0.05) were found between all groups. In conclusion, airborne particle abrasion yielded significantly lower bond strength as the Al2O3 particle size decreased. Shear bond strength decreased in the laser welded specimens.

【 授权许可】

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