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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of silica coating and laser treatment on the flexural strength, surface characteristics, and bond strength of a dental zirconia

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da Silva, Beatriz Togoro Ferreira [1, 2] ; Trevelin, Livia Tosi [2, 3] ; Schroeter, Ananda Carolina [2] ; Willers, Amanda Endres [4, 2] ; Cesar, Paulo Francisco [5] ; Matos, Adriana Bona [2]
Total Authors: 6
[1] Univ Santo Amaro, Sch Dent, Sao Paulo - Brazil
[2] Univ Sao Paulo, Sch Dent, Dept Operat Dent, Av Prof Lineu Prestes, 2227, Cidade Univ, BR-05508000 Sao Paulo, SP - Brazil
[3] Univ Sao Caetano Do Sul, Sch Dent, Sao Caetano do Sul - Brazil
[4] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Restorat Dent, Piracicaba - Brazil
[5] Univ Sao Paulo, Sch Dent, Dept Biomat & Oral Biol, Sao Paulo - Brazil
Total Affiliations: 5
Document type: Journal article
Source: European Journal of Oral Sciences; v. 129, n. 1 JAN 2021.
Web of Science Citations: 0

This study investigated the effect of irradiation with an erbium-doped yttrium aluminium garnet (Er:YAG) laser and coating with silica on the surface characteristics, bond strength, and flexural strength of dental zirconia. Three hundred and forty-three standard zirconia specimens were created, and 49 were assigned to each of seven surface treatment groups: (i) no treatment; Er:YAG laser (80 mJ/2 Hz) with pulse widths of 50 mu s (ii), 100 mu s (iii), 300 mu s (iv), or 600 mu s (v); or tribochemical silica coating at the partially sintered stage (vi) or after sintering was complete (vii). All specimens were sintered after the surface treatments, except for the group in which specimens were sintered before treatment. The study outcomes were roughness, surface loss, microshear bond strength (mu SBS), and biaxial flexural strength (BFS). Mean roughness and surface loss values were significantly higher in specimens from irradiated groups than in those from silica-coated groups. Regarding mu SBS, after aging, specimens from all experimental groups presented very low and similar mu SBS values, irrespective of the surface treatment. Silica coating after sintering yielded the highest BFS (1149.5 +/- 167.6 MPa), while coating partially sintered specimens with silica resulted a BFS (826.9 +/- 60.9 MPa) similar to that of the untreated control group (794.9 +/- 101.7 MPa). Laser treatments, irrespective of pulse width used, significantly decreased the BFS. In the group treated with laser at 300 mu s pulse width, specimens exhibited the lowest BFS value (514.1 +/- 71.5 MPa). Adhesion to zirconia was not stable after aging, regardless of the surface treatment implemented. (AU)

FAPESP's process: 15/13571-1 - Er:YAG laser pulse width influence in dentin and esthetic restorative materials
Grantee:Adriana Bona Matos
Support type: Regular Research Grants
FAPESP's process: 16/13117-1 - Effect of temporal width pulse of Er:YAG laser in zirconia morphology, roughness and bond strength
Grantee:Beatriz Togoro Ferreira da Silva
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 18/00465-7 - Effect of CAD/CAM milling, polishing and sandblasting processes on the mechanical properties of different dental zirconia
Grantee:Beatriz Togoro Ferreira da Silva
Support type: Scholarships abroad - Research Internship - Doctorate