| Objective:This experiment uses Nd:YAG laser,low temperature plasma treatment to bio-inert polyether ketone（PEEK）surface treatment,after a series of tests before and after the treatment were characterized by a series of tests and the effect of Nd:YAG laser and low temperature plasma treatment on PEEK bonding strength was evaluated by shear bond strength（SBS）test.It provides a solid theoretical basis for PEEK’s application in the oral field.Methods:The PEEK test pieces were randomly divided into 9 groups（n=24/group）,according to the different power of Nd:YAG laser is divided into（A）P group,no treatment,（B）0.5W group,（C）0.75W group,（D）1.0W group,（E）1.25W groups,divided into（F）O215min,（G）O225min,（H）O235min,（I）O2+Ar 25min,each group divided into two subgroups:Hot and cold cycles 0 times and 5000 times.The material is characterized before and after processing by SEM,contour meter,water contact angle and EDS energy spectrometer,and the hot and cold cycle instrument is used to cycle 5000times between 5 and 55℃,each lasting 60s,each group of test pieces are performed on the universal test machine to shear bond strength test,ECL fully automated light-emitting analysis system to observe the fracture mode.Results:In this experiment,the surface of PEEK test piece carried out different power Nd:YAG laser irradiation,different low temperature plasma treatment,and observed the change of micromorphology and physical and chemical properties of PEEK test piece surface.With the increase of Nd:YAG laser power,SEM shows that the pores on the PEEK surface increase in diameter and number,and the pores at 1.25W are almost connected in a series.As the O2plasma processing time increases,SEM shows that the PEEK surface plow is wider and deeper.After the treatment of O2,O2+Ar plasma,white dots appear on the surface of PEEK.The profiler results show an increase in surface roughness（Ra）,with Ra is 546.2±5.2nm at 0.75W and Ra is 372.2±8.8nm at O235min.At the same processing time of 25min,O2and O2+Ar plasma produce similar roughness effects.The contact angle and blank group of the experimental group were reduced to a certain extent.The laser group EDS shows that the C element decreases and the N and O elements increase.Plasma group EDS shows that the C element decreases,the N and O elements increase,under the same length of plasma treatment conditions,the PEEK surface C and N elements treated by O2and Ar are lowered,and the O element is raised.The shear bonding strength before hot and cold cycle is0.75W>0.5W>1.25W>1.0W>O235min>O225min>O215min>O2+Ar 25min>P,5000 hot and cold cycles after cutting bonding strength from large to small 0.75W>O235min>0.5W>1.0W>1.25W>O225min>O2+Ar25min>O215min>P,The maximum shear strength of the laser power before and after the hot and cold cycle was 0.75W was7.29±1.39MPa,6.26±1.33MPa,and the difference was statistically significant（P<0.05）.The hot and cold cycle generally reduces the shear bonding strength of the test piece,and the difference before and after the hot and cold cycle of the experimental group is statistically significant（P<0.05）.The fracture mode of each experimental group was mainly based on interface destruction type and mixed destruction type,and no simple cohesive destruction type was observed.Conclusions:1.Nd:YAG laser irradiation in a certain power range,O2,O2+Ar plasma treatment can improve roughness and wetting of PEEK to a certain extent.2.After 5000 hot and cold cycles,the shear bonding strength of the test piece was generally reduced,and the difference is statistically significant（P<0.05）.3.Nd:YAG laser power is 0.75W after treatment with O235min plasma PEEK and resin to produce a larger bonding strength（P<0.05）,Nd:YAG laser power 0.75W after treatment PEEK and resin bonding strength was better. |
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