title: Effect of laser welding on the titanium composite tensile bond strength.
abstract: 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 (Al(2)O(3)) 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 Al(2)O(3) grain size: A - 250 microm; B - 180 microm; C- 110 microm; and D - 50 microm. 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 (alpha=0.05). The highest bond strength means were recorded in 250 microm group without laser welding. The lowest shear bond strength means were recorded in 50 microm 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 Al(2)O(3) particle size decreased. Shear bond strength decreased in the laser welded specimens.
authors.affiliation: Department of Prosthodontics and Dental Materials, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Galo
authors.forename: Ricardo Faria
authors.initials: RF
authors.lastname: Ribeiro
authors.forename: Renata Cristina Silveira
authors.initials: RC
authors.lastname: Rodrigues
authors.forename: Valéria de Oliveira
authors.initials: Vde O
authors.lastname: Pagnano
authors.forename: Maria da Glória Chiarello
authors.initials: Mda G
authors.lastname: de Mattos
mesh_terms: D020906:Air Abrasion, Dental; D000704:Analysis of Variance; D003188:Composite Resins; D003722:Dental Alloys; D012994:Dental Soldering / Q000379:methods*; D003799:Dental Stress Analysis; D007834:Lasers; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D010316:Particle Size; D033081:Shear Strength; D018709:Statistics, Nonparametric; D014025:Titanium; D014896:Welding / Q000379:methods
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; D014025:Titanium