BACKGROUND: Glass ionomer cement has been a commonly used filling material in the clinic. However, glass ionomer easily absorbs water and dissolves in early concretionary phase, which can reduce the leak tightness of the edge of obturator, resulting in slightly leakage.

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By integrating the material characteristics of all cosmic space-times, it has formed its unique material characteristics: the most concretionary in state, the most complex in structure, the most mysterious in material property, the most stagnant in quality, the realest in spectrum, the most changeable in motion, the closest in mechanism, etc.

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On the floors of the world's oceans manganese nodules are found as a result of pelagic sedimentation or precipitation; they are small, irregular, black to brown, friable, laminated concretionary masses consisting primarily of manganese salts and manganese-oxide minerals.

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With its unique location as the main artery for traffic and trade in southwest China from time immemorial, the south " Silk Road " and the transfer station of " Ancient Tea Horse Route " from Tibet to, Lijiang plays an important role in transmitting flows of trades from central China to southeast Asia and communications between Chinese culture and foreign culture and keeps numerous historical cultural heritages here: Lijiang Ancient City with a reputation of " Plateau Gusu " and " Eastern Venice " firstly estabilished in Nansong Dynasty, protected completely and operated energetically now with national characteristics and local characteristics; Mu ' s Residence called the " Concretionary Ancient Naxi Music ", which was Mu ' s hereditary local office in Lijiang and rebuilt as the ancient town museum in 1998; and numerous ancient temples including Wenfeng Temple, Fuguo Temple, Puji Temple and Yufeng Temple etc. combined with central Chinese culture and local national culture and influenced by Tibetan cultural characteristics; the Baisha Mural with magic Dongba culture taking Naxi ancient religion as carrier and Dongba Classics as the main record manner and reflecting the unique national cultural history of Naxi minority with the only living Dongba hieroglyph in the world and the integration of Taoism, Han Buddhism, Tibetan Buddhism and Dongba culture, which becomes the state-level key protected cultural site; and those national culture and national traditional art with abundant cultural content, including Baisha residential buildings and Shuhe residential buildings with long history and unique characteristics and Moso folklore still with matriclan characteristics at Lugu Lake bank, which compiles a colorful article for civilizations.

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