CAJ | 학술논문

背景：在含氟的酸性环境中，Damon铜镍钛弓丝能否具有与传统镍钛弓丝相当的耐腐蚀性能，铜离子的加入会不会影响其耐腐蚀性？目的：观察氟离子和酸对3M镍钛弓丝和Damon铜镍钛弓丝耐腐蚀性的影响。方法：采用动电位极化曲线法测得3M镍钛弓丝和Damon铜镍钛弓丝分别在4种(pH=7、不含氟离子；pH=7、含氟离子浓度0.2%；pH=7、含氟离子浓度0.5%；pH=5、含氟离子浓度0.5%)不同人工唾液中的动电位极化曲线，得到自腐蚀电位、自腐蚀电流密度和极化电阻，并用扫描电镜观察其腐蚀后的形态。结果与结论：在中性(pH=7)人工唾液中加入0.2%氟离子，Damon铜镍钛弓丝试件极化曲线上移，自腐蚀电流密度增大，极化电阻减小(P <0.05)，扫描电镜显示试件表面出现腐蚀；3M镍钛弓丝试件极化曲线没有偏移，自腐蚀电流密度、极化电阻基本不变(P>0.05)，腐蚀不明显；当氟离子浓度增大到0.5%时，两种试件极化曲线均上移，自腐蚀电流密度增大，极化电阻减小(P <0.05)，试件表面均出现明显腐蚀；当加入酸之后(pH=5)，腐蚀更加明显。提示低浓度氟不会影响3M镍钛弓丝的耐腐蚀性，但会降低Damon铜镍钛弓丝的耐腐蚀性；高浓度氟和酸均会降低他们的耐腐蚀性，Damon铜镍钛弓丝的耐腐蚀性不及3M镍钛弓丝。
배경：재함불적산성배경중，Damon동얼태궁사능부구유여전통얼태궁사상당적내부식성능，동리자적가입회불회영향기내부식성？목적：관찰불리자화산대3M얼태궁사화Damon동얼태궁사내부식성적영향。방법：채용동전위겁화곡선법측득3M얼태궁사화Damon동얼태궁사분별재4충(pH=7、불함불리자；pH=7、함불리자농도0.2%；pH=7、함불리자농도0.5%；pH=5、함불리자농도0.5%)불동인공타액중적동전위겁화곡선，득도자부식전위、자부식전류밀도화겁화전조，병용소묘전경관찰기부식후적형태。결과여결론：재중성(pH=7)인공타액중가입0.2%불리자，Damon동얼태궁사시건겁화곡선상이，자부식전류밀도증대，겁화전조감소(P <0.05)，소묘전경현시시건표면출현부식；3M얼태궁사시건겁화곡선몰유편이，자부식전류밀도、겁화전조기본불변(P>0.05)，부식불명현；당불리자농도증대도0.5%시，량충시건겁화곡선균상이，자부식전류밀도증대，겁화전조감소(P <0.05)，시건표면균출현명현부식；당가입산지후(pH=5)，부식경가명현。제시저농도불불회영향3M얼태궁사적내부식성，단회강저Damon동얼태궁사적내부식성；고농도불화산균회강저타문적내부식성，Damon동얼태궁사적내부식성불급3M얼태궁사。
BACKGROUND:In the fluorine-containing acidic environment, it is unclear whether Damon copper- nickel-titanium arch wire can have a corrosion resistance similar to conventional nickel-titanium arch wire and whether copper ion wil affect its corrosion resistance. OBJECTIVE: To evaluate the corrosion resistance of 3M nickel-titanium arch wires and Damon copper-nickel-titanium arch wires in artificial saliva with different fluoride and pH. METHODS:Potentiodynamic polarization curves of 3M nickel-titanium arch wires and Damon copper-nickel-titanium arch wires were measured in four kinds of artificial saliva (pH=7; pH=7, 0.2% fluoride; pH=7, 0.5% fluoride; pH=5, 0.5% fluoride). Then, the corrosion potential, corrosion current density and polarization resistance were acquired, and scanning electron microscope was used for morphological observation after corrosion. RESULTS AND CONCLUSION: In neutral (pH=7) artificial saliva, 0.2% fluoride ions added could shift up the Damon specimen polarization curve, increase the corrosion cerrent density and reduce the polarization resistance (P < 0.05); under the scanning electron microscope, corrosion was observable on the specimen surface. But 3M specimen polarization curve did not move, corrosion current density and polarization resistance substantialy unchanged (P > 0.05), and no significant corrosion was produced. When fluoride concentration was increased to 0.5%, the polarization curves of two kinds of the specimens moved, the corrosion cerrent density increased, the polarization resistance decreased (P < 0.05), and there was significant presence of corrosion on the specimen surface. When pH=5, corrosion phenomenon was more pronounced. These findings suggest that low concentrations fluoride cannot affect corrosion resistance of 3M arch wire, but can reduce the corrosion resistance of Damon arch wire; high concentrations of fluoride and acid can both reduce their corrosion resistance. In addition, the corrosion resistance of 3M arch is stronger than that of Damon arch wire.