Grinding the intaglio surface of yttria partially- and fully-stabilized zirconia polycrystals restorations: Effect on their fatigue behavior.
Grinding the intaglio surface of yttria partially- and fully-stabilized zirconia polycrystals restorations: Effect on their fatigue behavior.
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DOI：
10.1016/j.jmbbm.2020.103800
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发表时间：
2020-04
影响因子：
3.9
通讯作者：
C. Zucuni;B. D. Ilha;M. M. May-M.;L. G. May;L. Valandro
中科院分区：
文献类型：
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作者：
C. Zucuni;B. D. Ilha;M. M. May-M.;L. G. May;L. Valandro
本研究评价了金刚石钻头磨削第二代（氧化钇部分稳定氧化锆多晶，PSZ）和第三代氧化锆（全稳定氧化锆多晶，FSZ）的凹版表面，与牙本质模拟基底进行骨水泥粘结，对疲劳失效载荷、失效循环次数、表面微观形态和相变的影响。由第二代（Katana ML-HT，Kuraray）和第三代氧化锆（Katana STML，Kuraray）生产盘形试样，并根据凹版表面处理随机分配（n = 15）成两组：对照-对照（未研磨）;研磨- Gr（在凹版表面的中心研磨）。将陶瓷盘用骨水泥（Multilink Automix System）固定在牙本质模拟盘上。疲劳试验采用步进应力法。所得数据采用Kaplan Meier和Mantel-Cox检验进行分析。此外，表面形貌，粗糙度，相变和断口分析进行。SEM分析表明，磨削增加了表面粗糙度，并在两代氧化锆中引入了缺陷。磨削显著增加了第二代氧化锆的疲劳失效载荷、失效循环次数和存活率（对照：1373.33 N <磨削：1600 N），而磨削显著降低了第三代氧化锆的疲劳失效载荷、失效循环次数和存活率（对照：766.67 N >磨削：620 N）。因此，使用金刚石布尔斯钻头进行临床调整会破坏骨水泥型第三代氧化锆的疲劳行为。
This study evaluated the effects of diamond bur grinding the intaglio surface of second (yttria partially-stabilized zirconia polycrystals, PSZ) and third-generation zirconia (fully-stabilized zirconia polycrystals, FSZ) adhesively cemented to dentin analogue substrate on the fatigue failure load, cycle number until failure, surface micromorphology and phase transformation. Disc-shaped specimens were produced from second (Katana ML-HT, Kuraray) and third-generation zirconia (Katana STML, Kuraray) and randomly allocated (n = 15) into two groups according to the intaglio surface treatment: Control – Ctrl (without grinding); Grinding – Gr (grinding at the center of the intaglio surface). The ceramic discs were adhesively cemented (Multilink Automix System) onto dentin analogue discs. Fatigue tests were executed by the step-stress method. The obtained data were analyzed by Kaplan Meier and Mantel-Cox tests. In addition, surface topography, roughness, phase transformation and fractography analyses were performed. SEM analysis showed that grinding increased the surface roughness and introduced defects in zirconia from both generations. Grinding increased the fatigue failure load, number of cycles to failure and survival rates of the second-generation zirconia statistically (control: 1373.33 N < grinding: 1600 N), while these same outcomes were reduced by grinding for the third-generation zirconia significantly (control: 766.67 N > grinding: 620 N). Thus, clinical adjustments with diamond burs damage the fatigue behavior of adhesively cemented third-generation zirconia.