目的:探讨通用型粘接剂固化后唾液污染及再处理对Ⅴ类洞充填体边缘微渗漏的影响。方法:选取50颗离体前磨牙,于釉牙骨质界处预备楔状缺损洞型,随机分为5组,每组10颗牙齿。A组:直接涂布Single Bond Univer sal通用粘接剂,吹干光照;B—E组...目的:探讨通用型粘接剂固化后唾液污染及再处理对Ⅴ类洞充填体边缘微渗漏的影响。方法:选取50颗离体前磨牙,于釉牙骨质界处预备楔状缺损洞型,随机分为5组,每组10颗牙齿。A组:直接涂布Single Bond Univer sal通用粘接剂,吹干光照;B—E组:涂布Single Bond Univer sal通用粘接剂,吹干光照。新鲜唾液污染牙面10s后分别采用干燥;冲洗后干燥;冲洗后干燥再涂布粘接剂;及冲洗后干燥,再酸蚀再涂布粘接剂四种处理方式。所有试件均用Filte K Z350XT树脂进行充填。经冷热循环和亚甲基兰溶液染色后,从颊舌方向平行于牙体长轴正中将充填体纵向剖开,体视显微镜观测各组充填体龈壁边缘微渗漏程度。结果:通用粘接剂固化后唾液污染牙面仅干燥B组和冲洗后干燥C组其边缘微渗漏均高于未污染A组、差异具有统计学意义。冲洗干燥再涂布粘接剂D组和冲洗干燥、再酸蚀再涂布粘接剂E组与未污染A组龈壁边缘微渗漏无统计学差别。结论:Single Bond Universal通用粘接剂固化后唾液污染可导致充填体边缘微渗漏的增加。在临床操作中应避免唾液污染,一旦受到唾液污染后,应立即冲洗,干燥及再次应用粘接剂可减少树脂边缘微渗漏。展开更多
In this paper, we investigate additive results of the Drazin inverse of elements in a ring R. Under the condition ab = ha, we show that a ＋ b is Drazin invertible if and only if aaD （a ＋ b） is Drazin invertible, w...In this paper, we investigate additive results of the Drazin inverse of elements in a ring R. Under the condition ab = ha, we show that a ＋ b is Drazin invertible if and only if aaD （a ＋ b） is Drazin invertible, where the superscript D means the Drazin inverse. Furthermore we find an expression of （a ＋ b）D. As an application we give some new representations for the Drazin inverse of a 2 × 2 block matrix.展开更多
文摘目的:探讨通用型粘接剂固化后唾液污染及再处理对Ⅴ类洞充填体边缘微渗漏的影响。方法:选取50颗离体前磨牙,于釉牙骨质界处预备楔状缺损洞型,随机分为5组,每组10颗牙齿。A组:直接涂布Single Bond Univer sal通用粘接剂,吹干光照;B—E组:涂布Single Bond Univer sal通用粘接剂,吹干光照。新鲜唾液污染牙面10s后分别采用干燥;冲洗后干燥;冲洗后干燥再涂布粘接剂;及冲洗后干燥,再酸蚀再涂布粘接剂四种处理方式。所有试件均用Filte K Z350XT树脂进行充填。经冷热循环和亚甲基兰溶液染色后,从颊舌方向平行于牙体长轴正中将充填体纵向剖开,体视显微镜观测各组充填体龈壁边缘微渗漏程度。结果:通用粘接剂固化后唾液污染牙面仅干燥B组和冲洗后干燥C组其边缘微渗漏均高于未污染A组、差异具有统计学意义。冲洗干燥再涂布粘接剂D组和冲洗干燥、再酸蚀再涂布粘接剂E组与未污染A组龈壁边缘微渗漏无统计学差别。结论:Single Bond Universal通用粘接剂固化后唾液污染可导致充填体边缘微渗漏的增加。在临床操作中应避免唾液污染,一旦受到唾液污染后,应立即冲洗,干燥及再次应用粘接剂可减少树脂边缘微渗漏。
基金Supported by the National Natural Science Foundation of China(11361009)the Guangxi Provincial Natural Science Foundation of China(2013GXNSFAA019008)Science Research Project 2013 of the China-ASEAN Study Center(Guangxi Science Experiment Center)of Guangxi University for Nationalities
文摘In this paper, we investigate additive results of the Drazin inverse of elements in a ring R. Under the condition ab = ha, we show that a ＋ b is Drazin invertible if and only if aaD （a ＋ b） is Drazin invertible, where the superscript D means the Drazin inverse. Furthermore we find an expression of （a ＋ b）D. As an application we give some new representations for the Drazin inverse of a 2 × 2 block matrix.
