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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: European Journal of Oral Sciences; v. 129, n. 1 JAN 2021.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 15/13571-1 - Ação da largura de pulso do Laser de Er:YAG em dentina e materiais restauradores estéticos
• Beneficiário: Adriana Bona Matos
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/13117-1 - Efeito da largura temporal de pulso do laser de Er:YAG na adesão, rugosidade e morfologia da zircônia
• Beneficiário: Beatriz Togoro Ferreira da Silva
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/00465-7 - Efeito da usinagem CAD/CAM, do polimento e jateamento nas propriedades mecânicas de diferentes zircônias dentárias
• Beneficiário: Beatriz Togoro Ferreira da Silva
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado