Daou Elie E, Özcan Mutlu
Department of Prosthodontics, Faculty of Dental Medicine, Lebanese University, Beirut, Lebanon.
Department of Fixed Prosthodontics, Faculty of Dentistry, Saint Joseph University, Beirut, Lebanon.
J Biomed Mater Res B Appl Biomater. 2025 Jan;113(1):e35522. doi: 10.1002/jbm.b.35522.
The purpose of this study was to evaluate the characteristics of the ceramic bonding to cobalt-chromium (Co-Cr) alloys fabricated by casting, milling, and additive manufacturing, compared with zirconia and nickel-chromium. One hundred specimens (N = 100), prepared with the dimensions of 25 × 3 × 0.5 mm, were assigned to five groups (n = 20): presintered milled Co-Cr (Group M), additively manufactured Co-Cr (Group SLM), cast Co-Cr (Group C), presintered zirconia (Group Zi), and cast Ni-Cr (Group Ni). The bar specimens were prepared to receive porcelain on their central area (8 × 3 mm) of one side of each alloy strip. Only half of the specimens from each group were exposed to thermocycling (5°C-55°C for 5000 times). All specimens were placed in a bending device. Specimen surface morphology was examined by scanning electron microscopy. The bonding values between materials and the aging treatment effect groups were compared with two-way ANOVA. Variances were compared using the Levene test, the Bonferroni adjustment was used for multiple pairwise comparisons. The shape (m) and scale (σ) parameters of the two-parameter Weibull distribution values were calculated. Thermocycling did not affect the results of all the groups tested (p = 0.237). Statistical difference was found between the Co-Cr groups, and between groups Ni and Zi when compared to groups C and SLM (p < 0.001). Ni had the lowest adhesion values and cast Co-Cr the highest. A statistical difference was found between the three Co-Cr groups (p < 0.001), with the highest ceramic adhesion found in Group C and the lowest found in Group M. All specimens from Groups M, C, and Ni showed adhesive failures, whereas mixed failures were observed in Groups Zi and SLM. The fit of the maximum-likelihood line was a poor fit in the distribution of the aged SLM group (p < 0.010). Ceramic adhesion and failure types varied with the alloy choice and the manufacturing technique.
本研究的目的是评估通过铸造、铣削和增材制造制备的钴铬（Co-Cr）合金与氧化锆和镍铬合金相比，陶瓷结合的特性。制备了100个尺寸为25×3×0.5mm的试样（N = 100），分为五组（n = 20）：预烧结铣削Co-Cr（M组）、增材制造Co-Cr（SLM组）、铸造Co-Cr（C组）、预烧结氧化锆（Zi组）和铸造Ni-Cr（Ni组）。制备条形试样，使其在每个合金条一侧的中心区域（8×3mm）接受瓷层。每组仅一半试样进行热循环（5°C - 55°C，5000次）。所有试样置于弯曲装置中。通过扫描电子显微镜检查试样表面形态。材料与时效处理效果组之间的结合值采用双向方差分析进行比较。方差采用Levene检验进行比较，Bonferroni校正用于多重两两比较。计算双参数威布尔分布值的形状（m）和尺度（σ）参数。热循环对所有测试组的结果均无影响（p = 0.237）。与C组和SLM组相比，Co-Cr组之间以及Ni组和Zi组之间存在统计学差异（p < 0.001）。Ni的附着力值最低，铸造Co-Cr的附着力值最高。三个Co-Cr组之间存在统计学差异（p < 0.001），C组的陶瓷附着力最高，M组最低。M组、C组和Ni组的所有试样均出现粘结破坏，而Zi组和SLM组观察到混合破坏。最大似然线在时效处理后的SLM组分布中拟合较差（p < 0.010）。陶瓷附着力和破坏类型随合金选择和制造技术而异。
