Abstract
We have investigated the effect of non-thermal atmospheric pressure plasma (NTAPP) treatment and the post process time on the bonding strength and surface sterilization of dental zirconia. Presintered zirconia specimens were manufactured as discs, and then subjected to a 30-min argon treatment (Ar, 99.999%; 10 L/min) using an NTAPP device. Five post-treatment durations were evaluated: control (no treatment), P0 (immediate), P1 (24 h), P2 (48 h), and P3 (72 h). The surface characteristics, shear bonding strength (SBS) with two resin cements, and Streptococcus mutans biofilm formation of these plasma-treated dental zirconia were tested. Plasma did not change the roughness, and caused surface element changes and surface energy increase. Due to this increase in surface energy, SBS increased significantly (p < 0.05) within 48 h when RelyXTM U200 was used. However, the increase of surface oxygen significantly decreased (p < 0.05) the SBS of Panavia F 2.0 when using plasma immediately (P0). S. mutans adhesion decreased significantly (p < 0.05) for the P0, P1, and P2 groups compared to the control. The P0 group exhibited lower biofilm thickness than the other experimental groups due to the increased hydrophilicity (p < 0.05). Our study suggests that there is a suitable time window for the post NTAPP treatment regarding bonding strength and antimicrobial growth persist.
Highlights
The selection criteria of dental prosthesis includes mechanical properties, aesthetics, and biological compatibility
The present study investigated the differences in the bondingirradiation strengths of two resin cements, an investigation of the persistence of the effects of plasma during storage in and the is antibacterial atmosphere warranted. activity toward S. mutans after plasma-treated zirconia specimens had been stored for different intervals
The present study investigated differences theeffects bonding strengths two resin on cements, andresin cements
Summary
The selection criteria of dental prosthesis includes mechanical properties, aesthetics, and biological compatibility. Porcelain-fused-to-metal, porcelain-fused-to-gold, and all-ceramic materials have been used in the past, but none of these materials can simultaneously satisfy the requirements for aesthetics, strength and biocompatibility. Even if zirconia is a good dental material, it is important to further improve its bonding strength because the detachment of between zirconia and porcelain still occurred in the oral cavity after a long time. To this end, a range of treatments have been used to improve dental materials regarding biocompatibility and bonding strength, etc. Surface treatment of the prosthesis or teeth such as increased surface roughness can improve the bonding strength [7,8,9,10,11], but, a rougher surface can encourage the adhesion of bacteria [12,13]
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