| Mammals as one of the most advanced animal groups in the world today, aftermillions of years of evolution itself and outside, have evolved many structures andmorphologys which adapt to the environment and these characteristics for people in thefield of engineering of the design and development provide a unique inspiration. Mammalsin nutritional pattern classification can be divided into: carnivorous, omnivorous andherbivorous animals three types, and teeth as tissues of mammals hunting and eatingalways accompanied by the evolution itself and becoming more closely related to its lifehabit．So in order to apply the characteristics of animal teeth to bionics, we need to study itsbasic properties systematically.Through the use of friction and wear testing machine with Si3N4ceramic balls andthe teeth samples of grinding, the friction characteristics of three kinds of mammals teethwas got. The results show that the friction coefficient of the teeth over time curve can bedivided into three stages:①the initial contact, the friction coefficient increases slowly;②after a period of time, the friction coefficient increases rapidly;③with the increase oftime; the friction coefficient in a the stable stage. The causes of the above three stages canbe explained by biological materials science.Using SEM and CLSM, we measured the wear surface morphology and wear depth ofthe behavior of three kinds of mammals teeth. The results show that, the main wear form oftooth enamel is fatigue wear and abrasive wear, which mainly manifested in the flakedebris falling off, cracking phenomenon as well as a large number of wear abrasivesattaching to the wear surface. By the wear surface the wear degree can be judged roughlycorresponding to the teeth. Use CLSM to obtain the tooth wear surface depth canaccurately show the various tooth abrasion resistance is good or bad.By taking advantage of the vickers hardness tester and nano mechanics testsystem,mechanics performance test experiment on profile and maxillofacial of tooth wascarried out from two aspects of "macro" and "micro", obtained the mechanical properties ofthree kinds of predatory mammals teeth. The results show that the vickers hardness of thethree kinds of animals incisors have no significant difference, nano hardness withoutspecific conclusions, the order of the size of elastic modulus is: pig incisor> deer incisor>dog incisor; The vickers hardness, nano hardness and elastic modulus of three kinds ofanimals canine have the same order, dog canine largest, followed by pig canine, deercanine minimum, and from animal life habits and the microscopic view explain why tooth enamel surface has high nano hardness and elastic modulus; The vickers hardness ofthree animals molars, deer molars the largest,dog molars and pig molars are the samebasically, the order of the nano hardness and elastic modulus are: deer molars> pig molars>dog molars. The results show that both the organic composition content is higher and theenamel mineralization degree is lower, which will cause the nano hardness decreasedsignificantly; besides incisors, three kinds of animal’s mechanical properties and wearresistance of the canine and molar are same order, which shows that the high hardness teethmore wear-resisting.The scratch tester for the three kinds of mammals teeth longitudinal profile of one-wayscore get the enamel and the enamel of dentin of the critical load, and according to the size ofthe critical load to judge tooth enamel bond strength. The results show that the incisor toothenamel layer bonding strength is in the order: pig incisor> dog incisor> deer incisor; dogcanine teeth enamel layer bonding strength is the best, followed by pig canine, deer canineworst; the molar tooth enamel layer bonding strength is in the order: deer molar> pig molar>dog molar; besides the incisor, canine and molar of bonding strength are as the same as itswear resistance and mechanical properties. AFM characterization of incisors show size andarrangement of glaze column can affect the bonding strength of tooth enamel. |
PDF Full Text Request