Byeon Seon Mi, Lee Min Ho, Bae Tae Sung
Department of Dental Biomaterials and Institute of Biodegradable Material, Institute of Oral Bioscience and BK21 Plus Project, School of Dentistry, Chonbuk National University, 567 Baeckje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Korea.
Research Institute of Clinical Medicine of Chonbuk National University, Biomedical Research Institute of Chonbuk National University Hospital, 20 Geonji-ro, Deokjin-gu, Jeonju-si, Jeollabuk-do 54907, Korea.
Materials (Basel). 2017 Feb 9;10(2):148. doi: 10.3390/ma10020148.
As the proportion of adult orthodontic treatment increases, mainly for aesthetic reasons, orthodontic brackets are directly attached to yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) restorations. This, study analyzed the shear bond strength (SBS) between various surface treated Y-TZP and orthodontic metal brackets. The Y-TZP specimens were conditioned by 110 μm Al₂O₃ sandblasting, or sandblasting followed by coating with one of the primers (silane, MDP, or an MDP-containing silane primer). After surface treatment, the orthodontic metal bracket was bonded to the specimen using a resin cement, and then 24 h storage in water and thermal cycling (5000 cycles, 5-55 °C), SBS was measured. Surface roughness was analyzed for surface morphology, and X-ray photoelectron spectroscopy (XPS) was employed for characterization of the chemical bond between the Y-TZP and the MDP-based primers (MDP, MDP containing silane primer). It was found that after surface treatment, the surface roughness of all groups increased. The groups treated with 110 μm Al₂O₃ sandblasting and MDP, or MDP-containing silane primer showed the highest SBS values, at 11.92 ± 1.51 MPa and 13.36 ± 2.31 MPa, respectively. The SBS values significantly decreased in all the groups after thermal cycling. Results from XPS analysis demonstrated the presence of chemical bonds between Y-TZP and MDP. Thus, the application of MDP-based primers after Al₂O₃ sandblasting enhances the resin bond strength between Y-TZP and the orthodontic metal bracket. However, bonding durability of all the surface-treated groups decreased after thermal cycling.
随着成人正畸治疗比例的增加,主要出于美观原因,正畸托槽直接附着于氧化钇稳定四方多晶氧化锆(Y-TZP)修复体上。本研究分析了经不同表面处理的Y-TZP与正畸金属托槽之间的剪切粘结强度(SBS)。Y-TZP试件分别用110μm氧化铝喷砂处理,或喷砂后涂覆一种底漆(硅烷、MDP或含MDP的硅烷底漆)。表面处理后,用树脂水门汀将正畸金属托槽粘结到试件上,然后在水中储存24小时并进行热循环(5000次循环,5-55℃),测量SBS。分析表面粗糙度以观察表面形态,并采用X射线光电子能谱(XPS)表征Y-TZP与基于MDP的底漆(MDP、含MDP的硅烷底漆)之间的化学键。结果发现,表面处理后,所有组的表面粗糙度均增加。用110μm氧化铝喷砂处理并涂覆MDP或含MDP的硅烷底漆的组显示出最高的SBS值,分别为11.92±1.51MPa和13.36±2.31MPa。热循环后所有组的SBS值均显著降低。XPS分析结果表明Y-TZP与MDP之间存在化学键。因此,在氧化铝喷砂后应用基于MDP的底漆可提高Y-TZP与正畸金属托槽之间的树脂粘结强度。然而,热循环后所有表面处理组的粘结耐久性均降低。