Experimental Study On Surface Modification Of Dental Implant System

The application of dental implant restoration technique has been more and more common in the field of stomatology and titanium is the most commonly used material for implant system. However, as a kind of inert metal material, pure titanium is short of initiative in the osseointegration process. These defects greatly reduce the reliability and service life of the implant system. Meanwhile, the pure titanium implant system has a higher risk of abutment screw loosening because of its own low hardness, fatigue strength and wear-resisting performance. This thesis consists of three parts:Plasma oxidation on implant and animal experiment. Depostion of plasma oxidation on SLA titanium with annealing treatment and alkali liquor. diamond-like carbon film on medical titanium. The research mainly aims at improving the mechanical properties and biological activity of the titanium used on dental implant through these two surface modification methods.In this paper, the implant deal with SLA and plasma oxidated by using RF-PECVD technology. Animal twisted into data and twisted into SEM testproved that plasma oxidation treatment can make the SLA titanium sample with better biological activity.The SLA titanium was plasma oxidated by using RF-PECVD technology and the process parameters were optimized by evaluating the surface contact angle. Super-hydrophilic surface, on which the contact angle would approach 0°, can be achieved with the optimum technology parameters as followed:Ar/O2=5sccm/5sccm,200W RF power,-400V DC bias voltage 1 hour oxidation time and 6.5 working stress. SEM observation showed that the plasma oxidation in-situ formed a layer of titanium oxide on the original surface, but didn’t change the porous morphology obtained by SLA treatment. Based on plasma oxidation on the treatment and annealing treatment, found that the alkali liquor can obviously increase the TiOx thin film wettability long-term stability.In this paper, the DLC films were diposited on surface of medical titanium. The composition of DLC films obtained by different process conditions was analyzed by contact angle test. The lowest content of I(D)/I(G) bondings was found in the film obtained with the optimum technology parameters as followed:Ar/CH4=10sccm/15sccm,300W RF power,-300V DC bias voltage,1 hour deposition time and 7pa work stress. SEM observation demonstrated that the DLC film is smooth, homogeneous and compact. Therefore, it can be used as bearing and wear-resisting coating on surface of titanium implant.