The Qinghai （青海）-Tibet plateau is the newest and biggest orogenic belt in the world and a natural laboratory for researching continental geodynamics, such as continent-continent collision, convergence, subduction,...The Qinghai （青海）-Tibet plateau is the newest and biggest orogenic belt in the world and a natural laboratory for researching continental geodynamics, such as continent-continent collision, convergence, subduction, and plateau uplift. From the 1950s to the present, there have been many active-source （deep seismic sounding and deep seismic reflection profiling） and passive-source seismic probing （broadband seismic observations） implemented to reveal the crust-mantle structure. In this article, the authors mainly summarize the three seismic probings to discuss the Moho depth of the Qinghai-Tibet plateau based on the previous summaries. The result shows that the Moho of the Qinghai-Tibet plateau is very complex and its depth is very different; the whole outline of it is that the Moho depth is deeper beneath the south than the north and deeper in the west than in the east. In the Qiangtang （羌塘） terrane, the hinterland of the Qinghai-Tibet plateau, the Moho is shallower than both the southern and the northern sides. The deepest Moho is 40 km deeper than the shallowest Moho. This trend records the crustal thickening and thinning caused by the mutual response between the India plate and the Eurasia plate, and the eastward mass flow in the Qinghai-Tibet plateau.展开更多
目的引导骨再生(guided bone regeneration,GBR)技术是解决种植体周围骨损伤缺的有效方法,文中通过临床回顾性研究,评价GBR术同期牙种植对美学区种植体周软组织的影响。方法选取45名患者共60颗(其中基于GBR后种植30颗,常规种植30颗)负重...目的引导骨再生(guided bone regeneration,GBR)技术是解决种植体周围骨损伤缺的有效方法,文中通过临床回顾性研究,评价GBR术同期牙种植对美学区种植体周软组织的影响。方法选取45名患者共60颗(其中基于GBR后种植30颗,常规种植30颗)负重1年的种植体进行临床病历回顾,在术后的3个时间点(种植体暴露口腔后1个月为T1,完成永久修复体之后为T2,以及功能负荷1年后为T3,分别记录了各组种植体的牙周探诊深度和龈乳头指数,分析行GBR术对前牙种植的牙周指数有无影响。结果对比3个时间点2组临床资料牙周探诊指数的变化,GBR组:T1(2.11±0.68)mm,T2(2.13±0.70)mm,T3(2.31±0.84)mm;常规种植组:T1(2.08±0.71)mm,T2(2.15±0.70)mm,T3(2.27±0.84)mm,2组间差异无统计学意义(P>0.05)。龈乳头指数的2组频数分布差异也无统计学意义(P>0.05)。结论 GBR术对美学区牙种植体周牙龈未发现明显影响。展开更多
基金supported by the National Natural Science Foundation of China (Nos. 40830316, 40874045)International Sciences and Technology Cooperation (No. 2006DFA21340)+5 种基金the Special Fund for Sciences and Technology Research of Public Welfare Trades (No. 200811021)the Key Innovation Project for Sciences and Technology of the Ministry of Land and Resources (No. 1212010711813)the China Geological Survey and Resources Land Investigation Project (No. 1212010611809)the Basic Outlay of Scientific Research Work from Ministry of Science and Technology of the People’s Republic of China (No. J0803)SINOPPROBE-II, the Ministry of Land and Resources of China (No. 2004DKA20280-2-5)Open Fund of Key Laboratory of Geo-detection (China University of Geosciences, Beijing) (No. GDL0603)
文摘The Qinghai （青海）-Tibet plateau is the newest and biggest orogenic belt in the world and a natural laboratory for researching continental geodynamics, such as continent-continent collision, convergence, subduction, and plateau uplift. From the 1950s to the present, there have been many active-source （deep seismic sounding and deep seismic reflection profiling） and passive-source seismic probing （broadband seismic observations） implemented to reveal the crust-mantle structure. In this article, the authors mainly summarize the three seismic probings to discuss the Moho depth of the Qinghai-Tibet plateau based on the previous summaries. The result shows that the Moho of the Qinghai-Tibet plateau is very complex and its depth is very different; the whole outline of it is that the Moho depth is deeper beneath the south than the north and deeper in the west than in the east. In the Qiangtang （羌塘） terrane, the hinterland of the Qinghai-Tibet plateau, the Moho is shallower than both the southern and the northern sides. The deepest Moho is 40 km deeper than the shallowest Moho. This trend records the crustal thickening and thinning caused by the mutual response between the India plate and the Eurasia plate, and the eastward mass flow in the Qinghai-Tibet plateau.
文摘目的引导骨再生(guided bone regeneration,GBR)技术是解决种植体周围骨损伤缺的有效方法,文中通过临床回顾性研究,评价GBR术同期牙种植对美学区种植体周软组织的影响。方法选取45名患者共60颗(其中基于GBR后种植30颗,常规种植30颗)负重1年的种植体进行临床病历回顾,在术后的3个时间点(种植体暴露口腔后1个月为T1,完成永久修复体之后为T2,以及功能负荷1年后为T3,分别记录了各组种植体的牙周探诊深度和龈乳头指数,分析行GBR术对前牙种植的牙周指数有无影响。结果对比3个时间点2组临床资料牙周探诊指数的变化,GBR组:T1(2.11±0.68)mm,T2(2.13±0.70)mm,T3(2.31±0.84)mm;常规种植组:T1(2.08±0.71)mm,T2(2.15±0.70)mm,T3(2.27±0.84)mm,2组间差异无统计学意义(P>0.05)。龈乳头指数的2组频数分布差异也无统计学意义(P>0.05)。结论 GBR术对美学区牙种植体周牙龈未发现明显影响。
