The Interrelated Research Of Mechanical Properties After Soaking Treatment And Antimicrobial Properties After Micro-friction Of Denture Base Resins With Hybrid Coating

PMMA (Polymethylmethacrylate, PMMA) is the frequently used plastic denture base material,which can be widely used in the manufacture of removable partial dentures and complete dentures.However, bacterias and fungus can easily colonize on the surface of the plastic denture base resultingin accumulation of a large number of plaque adhesion and becoming a high risk of oral health afterworn a long time. Denture base need to be immersed in the saliva when it is used, the water moleculeswill speed up the aging process of the denture base. Studies found that if the proportion of the elderlypopulation increases, removable partial dentures and complete dentures demand will also increase.Ideal denture base resins should have good mechanical properties, aging resistance, antibacterial andbiological security. Currently most of the denture base resin products can meet the basic clinicalrequirements. In the field of dental materials, there has been many methods to enhance the mechanicalproperties of PMMA resin, meanwhile the novel and improved resins which have better performanceare also reported in the literature recently. The researchers used some methods such as novel cleaningagents, mechanically grinding brush to clean the denture base and incorporating nano-antibacterialagents. Denture base surface treatment which contain anti-bacterial coating, glazing, and othermethods to alter the surface electric charge to make the denture base obtain substantial antibacterialproperties. The antibacterial coating has obvious effects, however, the brushing on the denture basewill lead to surface friction and eventually cause the lost of surface coating.In this research a new type of organic-inorganic hybrid antimicrobial coating was synthesized. Wegot organic polymer coating through the co-polymerization of methyl methacrylate, glycidyl-methacrylate, three monomers acrylic acids and co-hydrolysis condensation to synthesize organichybrid sol by TEOS and glycidyl trimethoxy silane. We took the broad-spectrum antimicrobial silver nanoparticles and mesoporous silica nano-carrier to synthesize mesoporous silica nano-silverparticles,then doped into organic-inorganic hybrid coatings.We acquired a newly designedorganic-inorganic hybrid coating which has good mechanical properties and antibacterial properties.The coating improved the glossiness, decreased the water sorption and solubility of the denture baseresin, eventually improved the comprehensive performance of the resin.The investigation included the surface topography observation of the coating group, three pointsflexural test of the specimens after6months aging process in water under37℃evaluated the hybridcoating’s water aging resistance. Moreover, in vitro we simulated the circumstance in which denturebase surface might be liable to abrasion, in order to find whether the micro friction had the effects oncoating’s antimicrobial performance to streptococcus mutans and candida albicans.