Porojan Liliana, Toma Flavia Roxana, Vasiliu Roxana Diana, Topală Florin-Ionel, Porojan Sorin Daniel, Matichescu Anamaria
Department of Dental Prostheses Technology (Dental Technology), Center for Advanced Technologies in Dental Prosthodontics, Faculty of Dental Medicine, "Victor Babeș" University of Medicine and Pharmacy Timișoara, Eftimie Murgu Sq. No. 2, 300041 Timișoara, Romania.
Department of Prosthodontics, Faculty of Dental Medicine, "Victor Babeș" University of Medicine and Pharmacy Timișoara, Eftimie Murgu Sq. No. 2, 300041 Timișoara, Romania.
Polymers (Basel). 2021 Nov 25;13(23):4102. doi: 10.3390/polym13234102.
Considering that the processes of PEEK discoloration caused by either intrinsic or extrinsic factors require elucidation, the aim of this study was to investigate the long-term effect of the combined action of ageing and immersing solutions on the optical properties and color stability of PEEK material, related to surface processing (polishing or glazing). (2) Methods: This study aims to determine the influence of different ageing and staining protocols on optical properties, color changes, and surface roughness of a reinforced PEEK material (bioHPP, Bredent, Senden, Germany). For ageing, specimens were submitted to 5000 cycles in a 55 °C bath and a 5 °C bath filled with distilled water. For staining, thermal cycling was performed in a hot coffee bath (55 °C) and a bath filled with distilled water (37 °C) and in a cold juice bath (5 °C) and a bath filled with distilled water (37 °C). Translucency (TP) and opalescence (OP) parameters were determined, the total color change value (ΔΕ*) was calculated, specimens' surface roughness was analyzed, and statistical analyses were performed. (3) Results: The mean TP values of the studied samples were in the interval of 1.25-3.60, which is lower than those reported for natural teeth or other aesthetic restoration materials. The OP values of PEEK were registered in the range of 0.27-0.75, being also lower than those of natural teeth or other aesthetic restoration materials. OP has a very strong positive relationship with TP. The mean registered Ra values for all subgroups were below 0.13 µm. Artificial ageing and staining in hot coffee proved to increase the roughness values. (4) Conclusions: The glazing of PEEK has a favorable effect on surface roughness and opalescence, irrespective of the artificial ageing or staining protocols. Artificial ageing damages the color stability and roughness of PEEK, regardless of surface processing, and decreases the translucency and opalescence of glazed surfaces. Immersion in hot coffee leads to perceivable discolorations.
鉴于聚醚醚酮（PEEK）因内在或外在因素导致变色的过程需要阐明，本研究的目的是探讨老化和浸泡溶液联合作用对PEEK材料光学性能和颜色稳定性的长期影响，这与表面处理（抛光或上釉）有关。（2）方法：本研究旨在确定不同老化和染色方案对增强PEEK材料（bioHPP，德国布雷登特公司，森登）光学性能、颜色变化和表面粗糙度的影响。对于老化，将试样置于55℃水浴和5℃水浴中，每个水浴中装有蒸馏水，进行5000次循环。对于染色，在热咖啡浴（55℃）和装有蒸馏水的浴（37℃）以及冷果汁浴（5℃）和装有蒸馏水的浴（37℃）中进行热循环。测定透明度（TP）和乳光率（OP）参数，计算总颜色变化值（ΔΕ*），分析试样表面粗糙度，并进行统计分析。（3）结果：所研究样品的平均TP值在1.25 - 3.60范围内，低于天然牙齿或其他美学修复材料报道的值。PEEK的OP值在0.27 - 0.75范围内，也低于天然牙齿或其他美学修复材料的值。OP与TP有非常强的正相关关系。所有亚组的平均登记Ra值均低于0.13µm。在热咖啡中进行人工老化和染色证明会增加粗糙度值。（4）结论：无论人工老化或染色方案如何，PEEK上釉对表面粗糙度和乳光率都有有利影响。人工老化会损害PEEK的颜色稳定性和粗糙度，无论表面处理如何，并会降低上釉表面的透明度和乳光率。浸泡在热咖啡中会导致明显变色。
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