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Abstract
Zirconia ceramics have been widely used as dental restorations due to their esthetic appearance and high flexural strength. The bonding of zirconia with resin cement should rely on both mechanical and chemical bonds. This study was performed to investigate the effect of zirconia surface topography and its wettability after surface pretreatments on the microshear bond strength (μSBS) of a resin cement. Zirconia slabs were prepared and randomly divided into 5 groups based on the surface treatment as follows: no treatment (control), air abrasion (AB), etching with hydrofluoric acid (F), the mixture of hydrofluoric acid and nitric acid (FN), or the mixture of hydrochloric acid and nitric acid (CN) for 10 min. The specimens were subjected to investigation of surface roughness characteristics [average roughness (Ra), peak-to-valley average distance (Rpv), skewness (Rsk), and kurtosis (Rku)] using atomic force microscopy (AFM) and measurements of surface contact angle (θc) and μSBS of a resin cement. In addition, the area % of the nanoscale surface irregularity (nSI%) was calculated from the AFM images. The effects of nSI%, Ra and θc on the μSBS were analyzed by multiple linear regression analysis (p < 0.05). Multiple regression analysis revealed that the nSI% was the most predominant factor for the μSBS (p < 0.001). A surface with larger nSI%, higher Ra and relatively lower θc was essential for establishing a reliable resin-zirconia bond.
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Details
1 Buddhasothorn Hospital, Dental Section, Muang, Thailand
2 Bangkokthonburi University, Faculty of Dentistry, Taweewatana, Thailand (GRID:grid.443746.6) (ISNI:0000 0004 0492 1966)
3 Chiang Mai University, Department of Restorative Dentistry and Periodontology, Faculty of Dentistry, Muang Chiang Mai, Thailand (GRID:grid.7132.7) (ISNI:0000 0000 9039 7662)
4 Chiang Mai University, Department of Chemistry, Faculty of Science, Muang Chiang Mai, Thailand (GRID:grid.7132.7) (ISNI:0000 0000 9039 7662)
5 Chiang Mai University, Dental Research Center, Faculty of Dentistry, Muang Chiang Mai, Thailand (GRID:grid.7132.7) (ISNI:0000 0000 9039 7662)
6 Tokushima University, Department of Regenerative Dental Medicine, Graduate School of Biomedical Sciences, Tokushima, Japan (GRID:grid.267335.6) (ISNI:0000 0001 1092 3579)
7 King’s College London, King’s College London Dental Institute, London, UK (GRID:grid.13097.3c) (ISNI:0000 0001 2322 6764)
8 Tokyo Medical and Dental University, Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Bunkyo-ku, Japan (GRID:grid.265073.5) (ISNI:0000 0001 1014 9130)