Femtosecond laser settings for optimal bracket bonding to zirconia
Scholar | Other documents of the author: García-Sanz, Verónica; Paredes-Gallardo, Vanessa; Bellot-Arcís, Carlos; Martínez León, Lluís; Torres-Mendieta, Rafael; Montero, Javier; Albadalejo, Alberto
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TitleFemtosecond laser settings for optimal bracket bonding to zirconia
Bonding orthodontic brackets to ceramic materials is a challenging procedure; femtosecond (FS) laser conditioning could provide improved results, but the ideal settings for effective bracket-zirconia bonding have ... [+]
Bonding orthodontic brackets to ceramic materials is a challenging procedure; femtosecond (FS) laser conditioning could provide improved results, but the ideal settings for effective bracket-zirconia bonding have never been established. This study aimed to analyze the differences in surface roughness and shear bond strength (SBS) produced by different femtosecond laser settings and establish a protocol to prepare zirconia surfaces for optimal adhesion to metal orthodontic brackets. One hundred eighty zirconia samples were assigned to six groups according to surface treatment: (1) control; (2) air-particle abrasion (APA); (3) FS laser irradiation (300 mW output power, 60 μm inter-groove distance); (4) FS laser irradiation (200 mW, 100 μm); (5) FS laser irradiation (40 mW, 60 μm); and (6) FS laser irradiation (200 mW, 60 μm). Surface roughness was measured. Orthodontic brackets were bonded to the zirconia specimens, and SBS was measured. SBS in groups 3 and 6 was significantly higher than the other groups (5.92 ± 1.12 MPa and 5.68 ± 0.94 MPa). No significant differences were found between groups 1, 2, 4, and 5 (3.87 ± 0.77 MPa, 4.25 ± 0.51 MPa, 3.74 ± 0.10 MPa, and 3.91 ± 0.53 MPa). Surface roughness was significantly greater for FS laser than for control and APA groups (p = 1.28 × 10−8 ). FS laser at 200 mW, 60 μm can be recommended as the ideal settings for treating zirconia surfaces, producing good SBS and more economical energy use. [-]
Investigation projectPROMETEU/2016/079 ; FIS2016-75618-R ; LM2015073
Bibliographic citationGARCÍA-SANZ, Verónica, et al. Femtosecond laser settings for optimal bracket bonding to zirconia. Lasers in medical science, 2019, vol. 34, no 2, p. 297-304.
© Springer-Verlag London Ltd., part of Springer Nature 2018. “This is a post-peer-review, pre-copyedit version of an article published in LASERS IN MEDICAL SCIENCES. The final authenticated version is available online at: https://doi.org/10.1007/s10103-018-2589-3”.