【摘要】 作者将４８颗二段式圆柱形骨内种植体根据骨吸收程度分为甲组（０～２ｍｍ）、乙组（＞２ｍｍ），另选健康天然牙为对照组（丙组）。取龈沟内容物置于生理盐水内离心，用暗视野及Ｇｒａｍ染色镜检，对菌群进行分析、研究。结果显示：健康种植体龈下菌群Ｇ＋球菌占８０％，而可动菌和螺旋菌极少，与对照组的天然牙相似。而不健康种植体组与对照组有较大的差异，以Ｇ－杆菌占优势，多达６０％，螺旋体比例也显著增高。提示Ｇ－杆菌和螺旋体可能是导致种植周围炎的重要因素之一。更多还原

【Abstract】 In order to study the relationship between oral microbioa and perioimplantitis 48 two-stage cylindrical endosleal implants coatcd with HA were divided into Group A(0-2mm)and Group B (>2mm)ac cording to the degree of bone.lose Health permanenl teeth were seleted as Group C(control group), Fluid of gingival sulous was collected and diluted with normal solution and then centrifugalizcd. The sample were cheeked directly under darklield miorosoopc and light microscope after Gram-stain The results showed that the dominant bacteria in Group A were gram postive coccus. up to 80%.motive bacillus and spirilla were rare,this is simiar to Group C.In Group B the dominant bacteria were gram-negative bacillus. up to 60%. and spirilla also increase obviously.It suggested that gram-negative bacillus and spirilla may be one of the loading factores that cause perioimplantitis.更多还原