Tabari Kasra, Hosseinpour Sepanta, Mohammad-Rahimi Hossein
Dental Research Center, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Dental Research Center, Research Institute of Dental Sciences, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
J Lasers Med Sci. 2017 Summer;8(Suppl 1):S56-S61. doi: 10.15171/jlms.2017.s11. Epub 2017 Aug 29.
In recent years, the use of ceramic base zirconia is considered in dentistry for all ceramic restorations because of its chemical stability, biocompatibility, and good compressive as well as flexural strength. However, due to its chemical stability, there is a challenge with dental bonding. Several studies have been done to improve zirconia bonding but they are not reliable. The purpose of this research is to study the effect of plasma treatment on bonding strength of zirconia. In this in vitro study, 180 zirconia discs' (thickness was 0.85-0.9 mm) surfaces were processed with plasma of oxygen, argon, air and oxygen-argon combination with 90-10 and 80-20 ratio (n=30 for each group) after being polished by sandblast. Surface modifications were assessed by measuring the contact angle, surface roughness, and topographical evaluations. Cylindrical Panavia f2 resin-cement and Diafill were used for microshear strength bond measurements. The data analysis was performed by SPSS 20.0 software and one-way analysis of variance (ANOVA) and Tukey test as the post hoc. Plasma treatment in all groups significantly reduces contact angle compare with control (=0.001). Topographic evaluations revealed coarseness promotion occurred in all plasma treated groups which was significant when compared to control (<0.05), except argon plasma treated group that significantly decreased surface roughness (<0.05). In all treated groups, microshear bond strength increased, except oxygen treated plasma group which decreased this strength. Air and argon-oxygen combination (both groups) significantly increased microshear bond strength (<0.05). According to this research, plasmatic processing with dielectric barrier method in atmospheric pressure can increase zirconia bonding strength.
近年来，由于其化学稳定性、生物相容性以及良好的抗压强度和抗弯强度，牙科领域在全瓷修复中考虑使用陶瓷基氧化锆。然而，由于其化学稳定性，在牙体粘结方面存在挑战。已经进行了多项研究来改善氧化锆的粘结，但这些研究并不可靠。本研究的目的是研究等离子体处理对氧化锆粘结强度的影响。在这项体外研究中，180个氧化锆圆盘（厚度为0.85 - 0.9毫米）在经过喷砂抛光后，分别用氧气、氩气、空气以及氧气与氩气比例为90 - 10和80 - 20的混合气体的等离子体进行处理（每组n = 30）。通过测量接触角、表面粗糙度和形貌评估来评价表面改性。使用圆柱形的Panavia f2树脂水门汀和Diafill进行微剪切强度粘结测量。数据分析采用SPSS 20.0软件以及单因素方差分析（ANOVA）和事后检验的Tukey检验。与对照组相比，所有组的等离子体处理均显著降低了接触角（P = 0.001）。形貌评估显示，所有等离子体处理组均出现粗糙度增加，与对照组相比差异显著（P < 0.05），氩气等离子体处理组除外，该组表面粗糙度显著降低（P < 0.05）。在所有处理组中，微剪切粘结强度均有所提高，但氧气处理的等离子体组除外，该组强度降低。空气和氩氧混合气体处理组（两组）均显著提高了微剪切粘结强度（P < 0.05）。根据本研究，在大气压下采用介质阻挡法进行等离子体处理可以提高氧化锆的粘结强度。
