Samran Abdulaziz, Ali Shurouk, El Bahra Shadi, Hashem Ahmed Wagdy, Elbeshri Mohamed, Wille Sebastian, Kern Matthias
Visiting Associate Professor, Department of Prosthodontics, Propaedeutics and Dental Materials, Dental School, Christian-Albrechts University, Kiel, Germany; Associate Professor, Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, Dar Al Uloom University, Riyadh, Saudi Arabia; and Associate Professor, Department of Prosthodontics, College of Dentistry, Ibb University, Ibb, Yemen.
Visiting Assistant Professor, Department of Prosthodontics, Propaedeutics and Dental Materials, Dental School, Christian-Albrechts University, Kiel, Germany.
J Prosthet Dent. 2025 Jun;133(6):1583.e1-1583.e8. doi: 10.1016/j.prosdent.2025.03.017. Epub 2025 Apr 14.
How the yttria content (3Y-PSZ, 4Y-PSZ and 5Y-PSZ) affects the tensile bond strength of luting resin to translucent zirconia ceramics is unclear.
The purpose of this in vitro study was to evaluate whether the bond strength of resin to translucent zirconia ceramics and its durability are influenced by the yttria content (3Y-PSZ, 4Y-PSZ and 5Y-PSZ).
Sixty-four disk-shaped specimens of zirconia ceramics were randomly allocated to 4 groups (n=16) with respect to the yttria concentration: GHT: 3 mol% yttria-partially stabilized zirconia 3Y-PSZ; GHTML: 3 mol% yttria-partially stabilized multilayered zirconia 3Y-PSZ; GSTML: 4 mol% yttria-partially stabilized zirconia 4Y-PSZ; and GUTML: 5 mol% yttria-partially stabilized zirconia 5Y-PSZ. For bonding, acrylic resin tubes were filled with composite resin and bonded to the zirconia disks using adhesive luting resin by following manufacturer's instructions. Half of each main group (n=8) was stored in water for 3 days at 37 °C. The other half was stored in water for 150 days with 37 500 thermocycles (5 to 55 °C). The tensile bond strength test was determined with a universal testing machine at a crosshead speed of 2 mm/minute using a chain loop for alignment.
The tensile bond strength was not significantly affected by the yttria concentration of different zirconia materials (3Y-PSZ, 4Y-PSZ, and 5Y-PSZ, P=.17). The mean ±standard deviation failure loads for groups ranged from 24.1 ±2.6 MPa for the ultratranslucent multilayered zirconia (with thermocycling) to 52.7 ±5.4 MPa for the high translucent multilayered zirconia (without thermocycling). However, artificial aging adversely affected the tensile bond strength values for all tested zirconia systems (P<.001). Scanning electron microscope evaluation showed that cohesive fracture was the predominant failure mode, while few specimens exhibited adhesive failure at the interface.
The yttria concentration (3Y-PSZ, 4Y-PSZ, and 5Y-PSZ) had no significant effect on the bond strength of different zirconia ceramics (P=.17), whereas the artificial aging procedures led to a statistically significant decrease in tensile bond strength (P<.001).
氧化钇含量（3Y - PSZ、4Y - PSZ和5Y - PSZ）如何影响粘接树脂与半透明氧化锆陶瓷的拉伸粘接强度尚不清楚。
本体外研究的目的是评估树脂与半透明氧化锆陶瓷的粘接强度及其耐久性是否受氧化钇含量（3Y - PSZ、4Y - PSZ和5Y - PSZ）的影响。
将64个氧化锆陶瓷圆盘形试件根据氧化钇浓度随机分为4组（n = 16）：GHT：3摩尔%氧化钇部分稳定氧化锆3Y - PSZ；GHTML：3摩尔%氧化钇部分稳定多层氧化锆3Y - PSZ；GSTML：4摩尔%氧化钇部分稳定氧化锆4Y - PSZ；GUTML：5摩尔%氧化钇部分稳定氧化锆5Y - PSZ。为进行粘接，丙烯酸树脂管中填充复合树脂，并按照制造商说明使用粘接树脂将其粘接至氧化锆圆盘。每个主要组的一半（n = 8）在37°C水中储存3天。另一半在37500次热循环（5至55°C）下于水中储存150天。使用万能试验机以2毫米/分钟的十字头速度并使用链环进行对准来测定拉伸粘接强度试验。
不同氧化锆材料（3Y - PSZ、4Y - PSZ和5Y - PSZ）的氧化钇浓度对拉伸粘接强度无显著影响（P = 0.17）。各组的平均±标准差破坏载荷范围从超半透明多层氧化锆（经过热循环）的24.1±2.6兆帕到高半透明多层氧化锆（未经过热循环）的52.7±5.4兆帕。然而，人工老化对所有测试的氧化锆系统的拉伸粘接强度值有不利影响（P < 0.001）。扫描电子显微镜评估显示，内聚破坏是主要的破坏模式，而很少有试件在界面处表现出粘接破坏。
氧化钇浓度（3Y - PSZ、4Y - PSZ和5Y - PSZ）对不同氧化锆陶瓷的粘接强度无显著影响（P = 0.17），而人工老化程序导致拉伸粘接强度在统计学上显著降低（P < 0.001）。
