Unalan Degirmenci Beyza, Degirmenci Alperen, Seyfioglu Polat Zelal
Department of Prosthodontics, University of Van Yuzuncu Yil, Van 65080, Turkey.
Department of Restorative Dentistry, University of Van Yuzuncu Yil, Van 65080, Turkey.
J Funct Biomater. 2025 Apr 28;16(5):156. doi: 10.3390/jfb16050156.
The durability of computer-aided design/computer-aided manufacturing (CAD/CAM) resin nanoceramics in the oral environment is influenced by aging factors such as thermocycling and ultraviolet (UV) exposure. This study investigates the impact of these aging processes on surface characteristics and repair bond strength.
CAD/CAM resin nanoceramic samples were divided into the following five groups: control (non-aged), 1-year and 5-year thermocycling, and 1-year and 5-year UV aging ( = 12). For the thermocycling procedure, the parameters employed were a temperature range of 5-55 °C with dwell times of 20 s per bath and 10,000 and 50,000 cycles; for the ultraviolet aging process, the parameters were established at a wavelength of 340 nm, an intensity of 0.55 W/m², and durations of 300 h and 1500 h. Surface roughness, microhardness, and repair bond strength were analyzed through profilometry, Vickers microhardness testing, and shear bond strength assessment, respectively. SEM, AFM, and XRD analyses were performed for structural evaluation.
Both thermocycling and UV aging significantly increased surface roughness ( < 0.001) while reducing microhardness and repair bond strength ( < 0.001). UV aging had a more pronounced effect, particularly after five years, leading to the highest surface roughness (Ra: 61.77 μm; Rz: 271.57 μm) and lowest microhardness properties (63.13). EDAX analysis indicated matrix degradation and an increase in inorganic filler exposure.
Aging significantly affects the surface characteristics of CAD/CAM resin nanoceramics, with UV aging exhibiting the most detrimental impact. These findings highlight the necessity of considering long-term material stability in dentistry.
口腔环境中计算机辅助设计/计算机辅助制造（CAD/CAM）树脂纳米陶瓷的耐久性受热循环和紫外线（UV）照射等老化因素影响。本研究调查这些老化过程对表面特性和修复粘结强度的影响。
将CAD/CAM树脂纳米陶瓷样品分为以下五组：对照组（未老化）、1年和5年热循环组以及1年和5年紫外线老化组（ = 12）。热循环程序采用的参数为温度范围5 - 55°C，每个水浴停留时间20秒，循环次数10000次和50000次；紫外线老化过程的参数设定为波长340nm，强度0.55W/m²，持续时间300小时和1500小时。分别通过轮廓仪分析表面粗糙度、维氏显微硬度测试分析显微硬度以及剪切粘结强度评估分析修复粘结强度。进行扫描电子显微镜（SEM）、原子力显微镜（AFM）和X射线衍射（XRD）分析以进行结构评估。
热循环和紫外线老化均显著增加表面粗糙度（ < 0.001），同时降低显微硬度和修复粘结强度（ < 0.001）。紫外线老化的影响更为显著，尤其是五年后，导致表面粗糙度最高（Ra：61.77μm；Rz：271.57μm）和显微硬度最低（63.13）。能谱分析（EDAX）表明基体降解和无机填料暴露增加。
老化显著影响CAD/CAM树脂纳米陶瓷的表面特性，紫外线老化的影响最为有害。这些发现凸显了在牙科中考虑材料长期稳定性的必要性。
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