The PEKK material can be used in prosthodontics for framework manufacturing and is commonly laminated with veneering composites to achieve a better esthetics. Various surface treatment methods including sandblasting, etching, laser and cold plasma treatments were reported to enhance the adhesive properties of dental polymers. Both tensile and shear bond test were employed to quantify the bond strength between PEKK and veneering composites. The present in vitro study aims to evaluate the influence of acetylene, argon, air, nitrogen and oxygen plasma on the shear bond strength between PEKK and one veneering composite.

Firstly, to determine which bond test type should be applied, n = 40 PEKK specimens were treated with argon plasma. Both shear and tensile bond tests were performed and compared to the control group (n = 40). In shear bond testing, values were 8.14 ± 1.70 MPa for Argon plasma while 5.83 ± 1.42 MPa for control group. In tensile bond testing, Argon plasma 1.50 ± 0.51 MPa while control group 0.58 ± 0.50 MPa.

Afterwards n = 160 PEKK specimens were treated with rocatec sandblasting (n = 20), adhesive (n = 20), acetylene (n = 20), argon (n = 20), air (n = 20), nitrogen (n = 20), oxygen (n = 20) plasma types and compared to the untreated control group (n = 20) using shear bond strength test (SBS). Additionally surface roughness and scanning electron microscopy analyses were performed. The following SBS values were revealed: 10.22 ± 1.06 MPa for rocatec; 9.89 ± 3.08 MPa for acetylene, 9.16 ± 1.48 MPa for adhesive, 7.54 ± 1.52 MPa for argon, 7.09 ± 1.99 MPa for air, 7.03 ± 1.48 MPa for nitrogen, 5.69 ± 1.59 MPa for oxygen plasma types and 4.71 ± 1.54 MPa for the control group.

All groups, except control group, showed SBS over 5 MPa, which means that they are suitable for the clinical application, according to ISO 10477. Acetylene showed the highest SBS among all plasma types (p < 0.0001), which was on a level of rocatec sandblasting group. Rocatec and acetylene groups demonstrated Ra values significantly different to the reference group (p < 0.0001).

Plasma treatment especially with acetylene gas can be an effective more convenient surface treatment method for strengthening the bond strength between PEKK and veneering composites than traditional sandblasting/adhesive treatment.

PEKK材料可用于框架制造的修复修复中，通常与饰面复合材料层压在一起以获得更好的美学效果。据报道，包括喷砂，蚀刻，激光和冷等离子体处理在内的各种表面处理方法可增强牙科聚合物的粘合性能。拉伸和剪切粘结测试均用于量化PEKK和饰面复合材料之间的粘结强度。本体外研究旨在评估乙炔，氩气，空气，氮气和氧气等离子体对PEKK和一种饰面复合材料之间的剪切粘结强度的影响。

首先，为了确定应使用哪种键合测试类型，将n = 40个PEKK标本用氩等离子体处理。进行了剪切和拉伸粘结测试，并与对照组（n = 40）进行了比较。在剪切粘结测试中，氩等离子体的值为8.14±1.70 MPa，而对照组为5.83±1.42 MPa。在拉伸粘结测试中，氩等离子体为1.50±0.51 MPa，而对照组为0.58±0.50 MPa。

之后，对n = 160个PEKK标本进行了喷砂处理（n = 20），粘合剂（n = 20），乙炔（n = 20），氩气（n = 20），空气（n = 20），氮气（n = 20）。 ），氧气（n = 20）血浆类型，并使用剪切结合强度测试（SBS）与未处理的对照组（n = 20）进行比较。另外，进行了表面粗糙度和扫描电子显微镜分析。揭示了以下SBS值：罗卡特（Rocatec）为10.22±1.06 MPa；乙炔为9.89±3.08 MPa，胶粘剂为​​9.16±1.48 MPa，氩气为7.54±1.52 MPa，空气为7.09±1.99 MPa，氮气为7.03±1.48 MPa，氧等离子体类型为5.69±1.59 MPa，铝为4.71±1.54 MPa控制组。

根据ISO 10477，除对照组外，所有组的SBS均超过5 MPa，这表明它们适合临床应用。乙炔在所有血浆类型中均显示出最高的SBS（p <0.0001），水平为rocatec喷砂组。Rocatec和乙炔基团的Ra值明显不同于参考组（p <0.0001）。

与传统的喷砂/粘合剂处理相比，等离子体处理（尤其是乙炔气体处理）可以是一种有效的，更方便的表面处理方法，用于增强PEKK和饰面复合材料之间的粘结强度。