【摘要】 目的 :研究远缘链球菌g型对铸钛、Co_Cr合金、Ni_Cr合金修复体失泽腐蚀的影响。方法 :将Co_Cr合金、Ni_Cr合金、纯钛分别铸造制备成 10mm× 10mm× 1mm板片 ,每组 30片。将上述 3组每组随机分空白对照组 ,培养基对照组、实验组各 10片。需氧环境中 ,将g型远缘链球菌接种到蔗糖琼脂培养基后 ,将试件贴附其表面 ,每周转换传递一次 ,共 10周。 0 0 5 %戊二醛消灭细菌 ,清洗 ,2周后用MINOLTACR₁0 0型色度计观察。结果 :经统计学分析可知铸钛、Co_Cr合金、Ni_Cr合金修复体的空白对照组与培养基对照组的L 、a 、b 值无显著差异 （P >0 0 5 ）。铸钛、Co_Cr合金、Ni_Cr合金修复体实验组与空白对照组、培养基对照组的L 、a 、b 值有明显差异 （P <0 0 5 ）。结论 :按CIE1976标准检测得出远缘链球菌g型对Co_Cr合金、Ni_Cr合金、铸钛修复体色泽有影响 ,但未超出黄绿区域。更多还原

【Abstract】 Objective:The objective of this study was to investigate the tarnish induced by Streptococcus sobrinus serotype g on Co_Cr, Ni_Cr and casting titanium alloys.Methods:Co_Cr, Ni_Co and casting titanium alloys were respectively machined into a size of 10 mm×10 mm×1 mm in tablets, and totally 90 specimens with 30 of each were prepared for the test. The 30 specimens of each alloy were randomly and equally divided into three subgroups, including the blank control group, the media control group and the inoculated media group. Under the aerobic condition, the surfaces of the sucrose agar media were inoculated with Streptococcus sobrinus serotype g. The labeled sterile specimens were placed on the surface of the media for 10 weeks. The specimens were changed to a new sucrose media with bacteria each week. The specimens were removed after 10 weeks of incubation, immersed in 0 05% glutaraldehyde solution to eliminate AaY4, rinsed with distilled water. After 2 weeks, the specimens were removed and observed visually or examined by MINOLTA CR₁00 color apparatus. Results:Compared with the blank control, the control media without bacteria did not influence the alloy specimens （P>0 05）. Streptococcus sobrinus serotype g caused tarnish on specimens. There was significant difference between the control media group and the blank control group with inoculated media group on all the specimens （P<0 05）. Conclusion:Streptococcus sobrinus serotype g affects the color of Co_Cr, Ni_Cr and casting titanium alloys, but the color does not change from yellow_green range to red_yellow range.更多还原