The Preparation And The Effects Of Nano-/micro-Crystalline Diamond Film Deposited On Ti6Al4V As The Dental Implant Material

Implanting denture is the current most effictive way to defeat dentition repair. However, component loosening, especially the screws, as the most common clinical complicaitons comes easily with reported incidence as high as45%. Current screws are mostly made of titanium alloy materials. Under cyclic forces of repeated chewing, abrasion of components will occur as a result of small displacement among the implant, abutment screw and denture, repeated tightening and slack. In addition, microbial corrosion and electrochemical corrosion will generate by the penetration of saliva, substances in food, decomposition and fermentation from food debris, bacteria, gingival crevicular fluid, etc. Therefore, to enhance abrasion resistance, corrosion resistance and biological properties with surface modification is a hotspot of research. In this article, hot filament chemical vapor deposition (HFCVD) is used to deposite diamond films TC4in order to strengthen the stability of the titanium abutment screw in dentistry for improving its lifespan.Firstly, HFCVD was used to explore the nanocrystalline diamond (NCD) films deposition parameters on Si. Gas ratio, substrate temperature and deposition pressure was considered to the film properties. On the basis of previous work, substrat pretreatment and deposition process mediation was done and obtained as-deposited NCD and microcrystalline diamond(MCD) films with continuous, dense, small surface roughness and good adhesion. Then, SEM, AFM, Raman spectroscopy, XRD, scratches, reciprocating friction, electrochemistry, cell proliferation and apoptosis were used to evaluate the The morphology and quality, bonding strength, friction resistance, corrosion resistance and biocompability of the diamond films.The results indicate that diamond coating lowers the friction coefficient and friction rate. The friction coefficient of NCD is about0.09-0.15and MCD is about0.18-0.22, wherein the artificial saliva exhibit even lower. They also promote the corrosion resistance in artificial saliva, in which NCD films present more efficient improvements. CCK-8assay show the pattern of cell growth and cell apoptosis with L929fibroblast cell culture systems proved that both MCD and NCD films provide suitable and cytotoxicity-free surfaces.