The improved peri-implant bone response demonstrated by platform switching may be the result of reduced amounts of metal ions released to the surrounding tissues. The aim of this study was to compare the levels of met...The improved peri-implant bone response demonstrated by platform switching may be the result of reduced amounts of metal ions released to the surrounding tissues. The aim of this study was to compare the levels of metal ions released from platform-matched and platform-switched implant-abutment couples as a result of accelerated corrosion. Thirty-six titanium alloy （Ti-6AI-4V） and cobalt-chrome alloy abutments were coupled with titanium cylinders forming either platform-switched or platform-matched groups （n = 6）. In addition, 18 unconnected samples served as controls. The specimens were subjected to accelerated corrosion by static immersion in 1% lactic acid for 1 week. The amount of metal ions ion of each test tube was measured using inductively coupled plasma mass spectrometry. Scanning electron microscope （SEM） images and energy dispersive spectroscopy X-ray analyses were performed pre- and post-immersion to assess corrosion at the interface. The platform-matched groups demonstrated higher ion release for vanadium, aluminium, cobalt, chrome, and molybdenum compared with the platform-switched groups （P〈 0.05）. Titanium was the highest element to be released regardless of abutment size or connection （P〈0.05）. SEM images showed pitting corrosion prominent on the outer borders of the implant and abutment platform surfaces. In conclusion, implant-abutment couples underwent an active corrosion process resulting in metal ions release into the surrounding environment. The highest amount of metal ions released was recorded for the platform-matched groups, suggesting that platform-switching concept has a positive effect in reducing the levels of metal ion release from the implant-abutment couples.展开更多
目的系统评价分析平台转移(PS)技术对种植体边缘骨吸收和牙周组织健康的影响。方法计算机检索PubMed、Web of Science、Cochrane Central、CBM、CNKI、维普、万方数据库并以手工检索为辅助,收集1992—2018年间国内外公开发表的PS与平台...目的系统评价分析平台转移(PS)技术对种植体边缘骨吸收和牙周组织健康的影响。方法计算机检索PubMed、Web of Science、Cochrane Central、CBM、CNKI、维普、万方数据库并以手工检索为辅助,收集1992—2018年间国内外公开发表的PS与平台匹配(PM)技术的随机对照试验。对所纳入的文献进行数据提取、质量评估,采用RevMan 5.3软件进行Meta分析。结果共纳入18篇文献,643例病人,1 216枚种植体(616枚PS种植体,600枚PM种植体)。Meta分析显示,PS组种植体边缘骨吸收明显少于PM组(MD=-0.28,95%CIS=-0.40～-0.16,P<0.01),探诊深度明显小于PM组(MD=-0.19,95%CIS=-0.29～-0.10,P<0.01)。结论现有的数据表明,PS技术与PM技术相比更有利于种植体周围骨组织和软组织的健康。展开更多
基金funded by a scholarship from King Saud University, Kingdom of Saudi Arabia
文摘The improved peri-implant bone response demonstrated by platform switching may be the result of reduced amounts of metal ions released to the surrounding tissues. The aim of this study was to compare the levels of metal ions released from platform-matched and platform-switched implant-abutment couples as a result of accelerated corrosion. Thirty-six titanium alloy （Ti-6AI-4V） and cobalt-chrome alloy abutments were coupled with titanium cylinders forming either platform-switched or platform-matched groups （n = 6）. In addition, 18 unconnected samples served as controls. The specimens were subjected to accelerated corrosion by static immersion in 1% lactic acid for 1 week. The amount of metal ions ion of each test tube was measured using inductively coupled plasma mass spectrometry. Scanning electron microscope （SEM） images and energy dispersive spectroscopy X-ray analyses were performed pre- and post-immersion to assess corrosion at the interface. The platform-matched groups demonstrated higher ion release for vanadium, aluminium, cobalt, chrome, and molybdenum compared with the platform-switched groups （P〈 0.05）. Titanium was the highest element to be released regardless of abutment size or connection （P〈0.05）. SEM images showed pitting corrosion prominent on the outer borders of the implant and abutment platform surfaces. In conclusion, implant-abutment couples underwent an active corrosion process resulting in metal ions release into the surrounding environment. The highest amount of metal ions released was recorded for the platform-matched groups, suggesting that platform-switching concept has a positive effect in reducing the levels of metal ion release from the implant-abutment couples.
