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收集了临床中拆除的镍铬合金烤瓷冠,按佩戴年限分为1年组、2年组、3~4年组、5~9年组、10年以上组,并设立对照组.采用接触角仪测定各组试样的接触角,利用电化学工作站测试电化学腐蚀曲线,应用扫描电镜观察试样表面腐蚀形貌,并进行统计学分析.结果表明,1年组试样腐蚀电位及腐蚀电流密度相对较小,2年组试样腐蚀电位和腐蚀电流密度增加并显著高于其它组,3~5年组、5~10年组、10年以上组试样腐蚀电位及腐蚀电流密度相对2年组逐渐减小,这种变化趋势与接触角测试结果一致.随佩戴年限的增加,镍铬烤瓷内冠的腐蚀程度越来越严重,即镍铬合金烤瓷冠在口腔内存在腐蚀,且佩戴2年左右时腐蚀速度最快,腐蚀程度随年限增加累积.因此,口腔临床中应采取积极的措施预防镍铬合金烤瓷冠的早期腐蚀.
The nickel-chromium alloy porcelain crowns removed in clinic were collected and divided into 1 year group, 2 years group, 3 ~ 4 years group, 5 ~ 9 years group and 10 years group according to the wearing time, and the control group was established. The contact angle of each sample was measured by the angle meter, the electrochemical corrosion curve was measured by electrochemical workstation, the corrosion morphology of the sample was observed by scanning electron microscope, and the statistical analysis was carried out. The results showed that the corrosion potential and corrosion The current density is relatively small, and the corrosion potential and corrosion current density increase in 2-year group and are significantly higher than those in other groups. The corrosion potential and corrosion current density in 3 to 5 years group, 5 to 10 years group and 10 years group are relative 2-year group gradually decreased, this trend is consistent with the contact angle test results.With the increase of wearing life, the corrosion of the inner crown of the Ni-Cr porcelain becomes more and more serious, that is, the Ni-Cr alloy porcelain crown corrosion exists in the oral cavity , And wear the fastest corrosion rate of about 2 years, the degree of corrosion increases with age accumulation. Therefore, oral clinical should take positive measures to prevent the early corrosion of nickel-chromium alloy porcelain crowns.