Objective: To study the effect of non-thermal atmospheric plasma jet (NTAP) on the surface characters of lithium disilicate glass ceramics (LDC). Methods: Prepared LDC specimens were randomly divided into 7 groups (n=9): the blank control group

the HF-etching group and the NTAP-treating groups with different treatment time (10 s

20 s

30 s

40 s and 60 s). After different treatments

surface characters of specimens were analyzed by water contact angle test

X-ray diffraction analysis

atomic force microscope and X-ray photoelectron spectroscopy analysis. Results: Compared with the control group

specimens after HF-etching or NTAP-treating had some changes: the water contact angle values was dropped; the percent of oxygen atomic weight was significantly increased on the LDC surfaces; the oxygen/carbon ratio was increased

without obvious changes of phase transformation and without significant morphological change on the NTAP treated surfaces. Conclusion: NTAP treatment can increase the hydrophilicity of LDC surfaces and increase the oxygen atomic weight on the surface

without phase transformation or significant morphology change of LDC surfaces.