MSciD and PhD Post-Graduate Program in Oral Sciences (Prosthodontics Units), Faculty of Odontology, Federal University of Santa Maria (UFSM) Santa Maria, Rio Grande do Sul State.
J Prosthodont Res. 2021 Jun 30;65(2):162-170. doi: 10.2186/jpr.JPOR_2019_553. Epub 2020 Oct 6.
This study evaluated the influence of different surface treatments of zirconia used to enhance bonding with veneering porcelain, and thermocycling on the resistance to porcelain cracking and delamination during fatigue test.
Bilayer ceramic discs were made from zirconia blocks (IPS e.max Zircad MO, Ivoclar Vivadent - 0.7 mm thickness) and randomized into 8 groups (n= 15) according to two factors: 'zirconia surface treatment' (Control; Grinding - diamond bur; Air-abrasion - aluminum oxide particles; and Liner - application of a ceramic liner [IPS e.max Zirliner, Ivoclar Vivadent]); and 'thermocycling' (presence - 12,000 thermal cycles; 5-55ºC; or absence). The discs were veneered with porcelain (IPS e.max Ceram, Ivoclar Vivadent - 0.7 mm; totaling 1.4 mm thickness) according to ISO 6872:2015 for biaxial flexure strength testing. Fatigue tests (step-stress approach; 20 to 100 MPa; step of 10 MPa; 10,000 cycles per step; 10 Hz frequency) were run, followed by the data analysis (Kaplan-Meier and Mantel-Cox post-hoc tests). Analysis of roughness, topography, crystallographic phase arranges and fractography were also executed.
The surface treatment and thermocycling did not influence the porcelain crack nor delamination resistance. When only comparing the surface treatments for crack resistance outcome, the liner application depicted the worst fatigue performance in comparison to grinding and air-abrasion, while all groups were similar for delamination.
Neither the surface treatment of the zirconia nor the thermocycling influences the porcelain crack resistance or the resistance to delamination of the bilayer porcelain-veneered zirconia specimens.
本研究评估了不同表面处理的氧化锆对增强与饰面瓷结合的影响，以及热循环对疲劳试验中瓷裂和分层阻力的影响。
双层陶瓷片由氧化锆块（IPS e.max Zircad MO，义获嘉伟瓦登特 - 0.7 毫米厚度）制成，并根据两个因素随机分为 8 组（n=15）：“氧化锆表面处理”（对照组；研磨 - 金刚砂车针；喷砂机 - 氧化铝颗粒；和衬层 - 应用陶瓷衬层 [IPS e.max Zirliner，义获嘉伟瓦登特]）；和“热循环”（存在 - 12000 次热循环；5-55°C；或不存在）。根据 ISO 6872:2015 标准，将陶瓷（IPS e.max Ceram，义获嘉伟瓦登特 - 0.7 毫米；总厚度为 1.4 毫米）覆盖在陶瓷片上，进行双向弯曲强度测试。进行疲劳测试（阶跃应力方法；20 至 100 MPa；步长 10 MPa；每个步长 10000 次循环；10 Hz 频率），然后进行数据分析（卡普兰-迈耶和曼特尔-考克斯事后检验）。还进行了粗糙度、形貌、晶体相排列和断口形貌分析。
表面处理和热循环都没有影响瓷裂和分层阻力。当仅比较抗裂性结果的表面处理时，与研磨和喷砂机相比，衬层应用的疲劳性能最差，而所有组的分层阻力都相似。
氧化锆的表面处理或热循环都不会影响双层瓷覆盖氧化锆试件的瓷裂阻力或分层阻力。
