da Silva Bianca Cristina Dantas, da Silva Sarah Emille Gomes, da Silva Nathália Ramos, de Moreira Fernanda Gurgel Gois, Souza Karina Barbosa, Zhang Yu, de Souza Rodrigo Othávio Assunção
Department of Dentistry, Federal University of Rio Grande do Norte (UFRN), Natal, Rio Grande do Norte, Brazil.
Institute of Science and Technology, Paulista State University (UNESP), São José dos Campos, São Paulo, Brazil.
J Prosthodont. 2024 Aug 27. doi: 10.1111/jopr.13929.
To evaluate the effect of different surface treatments and adhesive cementation on the miniflexural strength (MFS) of monolithic zirconia.
Two-hundred and forty (240) sintered bars of translucent zirconia (Z) and ultra-translucent zirconia (Z) were obtained (8 mm ×2 mm ×1 mm). The bars were divided into 16 groups (n = 15) according to the factors "Zirconia" (Z and Z), "Cementation" (Cem) and "surface treatment" (Ctrl:Control, Al:Aluminum oxide/AlO 50 µm, Si:Silica/SiO coated alumina particles oxide 30 µm, Gl:Glazing+hydrofluoric acid). Half of the bars received an adhesive layer application, followed by application of resin cement and light curing. The surface roughness was measured in non-cemented groups. All the bars were subjected to the MFS test (1.0 mm/min; 100 kgf). Scanning electron microscopy was used for qualitative analyses. MFS data (MPa) and roughness (µm) were statistically evaluated by three-way and two-way ANOVA respectively and Tukey's test (5%).
The surface treatment and the interaction were significant for roughness. Glazing promoted less roughness compared to silicatization. Regarding MFS, only the zirconia and surface treatment factors were significant. For Z, the sandblasted groups had an increase in MFS and glazing reduced it. There was no difference between the groups without cementation for the Z; however, Z.Si/Cem, and Z.Al/Cem obtained superior MFS among the cemented groups.
Sandblasting increases the flexural strength for Z, while glaze application tends to reduce it. Applying resin cement increases the flexural strength of Z when associated with sandblasting. Sandblasting protocols promote greater surface roughness.
评估不同表面处理和粘结方法对整体式氧化锆微弯曲强度（MFS）的影响。
制备了240根半透明氧化锆（Z）和超半透明氧化锆（Z）烧结棒（8毫米×2毫米×1毫米）。根据“氧化锆”（Z和Z）、“粘结”（Cem）和“表面处理”（Ctrl：对照、Al：50微米氧化铝/AlO、Si：30微米二氧化硅/包覆氧化铝颗粒的氧化硅、Gl：上釉+氢氟酸）等因素将棒材分为16组（n = 15）。一半的棒材施加粘结剂层，随后施加树脂粘结剂并进行光固化。在未粘结组中测量表面粗糙度。所有棒材均进行MFS测试（1.0毫米/分钟；100千克力）。使用扫描电子显微镜进行定性分析。MFS数据（兆帕）和粗糙度（微米）分别通过三因素和双因素方差分析以及Tukey检验（5%）进行统计学评估。
表面处理及其相互作用对粗糙度有显著影响。与硅烷化相比，上釉产生的粗糙度较小。关于MFS，只有氧化锆和表面处理因素具有显著性。对于Z，喷砂处理组的MFS有所增加，而上釉处理则使其降低。Z的未粘结组之间没有差异；然而，在粘结组中，Z.Si/Cem和Z.Al/Cem获得了更高的MFS。
喷砂处理可提高Z的弯曲强度而上釉处理往往会降低其强度。当与喷砂处理结合时，施加树脂粘结剂可提高Z的弯曲强度。喷砂处理方案会导致更大的表面粗糙度。
