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Journal of Oral Laser Applications

Year 2002
Volume 2 , Issue 4

Pages: 223 - 229

Effect of Er:YAG Laser and Air Abrasion on the Tensile Bond Strength of Two Adhesive Restorative Systems to Dentin

Daniela Thomazatti Chimello/Renata Pereira Ramos/Michelle Alexandra Chinelatti/Regina Guenka Palma Dibb/Jesus Djalma Pecora/Silmara Aparecida Milori Corona

Purpose: To assess in vitro the effect of Er:YAG laser and air abrasion on the bond strength of Single Bond/Z250 and Bond1/Flow It! to dentin. Materials and Methods: Forty molars were selected and roots removed. Crowns were bisected and embedded in polyester resin and ground until dentin was exposed. The bonding site was delimited and samples were randomly assigned to two groups: 1) Single Bond/Z250 and 2) Bond1/Flow It! These were divided into four subgroups according to the surface treatment: A, Er:YAG laser (80 mJ/2 Hz); B, Er:YAG laser + phosphoric acid; C, air abrasion + phosphoric acid; D, control group. After conditioning and application of the adhesive systems, specimens were adapted to a metallic device, where resin cones were prepared. Samples were stored for 24 h and subjected to a bond strength test (50 kgf at 0.5 mm/min). Results: Average bond strengths in MPa were 1A, 10.45; 1B, 14.51; 1C, 16.47; 1D, 16.93; 2A, 10.02, 2B, 7.09; 2C, 18.21, 2D, 9.61. Statistical analysis showed that Single Bond/Z250 presented the highest bond strength value. Air abrasion provided the best result for Bond1/Flow It! Treatment with laser solely produced the lowest average for Single Bond/Z250. For both systems, the association of laser and acid showed results similar to the control group. Single Bond/Z250 presented mostly mixed fractures, while Bond1/Flow It! showed a higher percentage of adhesive fractures. Conclusion: Conditioning with Er:YAG laser and air abrasion may influence the bond strength of adhesive materials; nevertheless, the subsequent application of acid is mandatory.


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