冠修复材料对龈下优势菌生长的影响

The effect of four kinds of crown restorative materials on the growth of subgingival predominant bacteria

冠修复是牙体缺损后临床常用方法,修复时会造成龈沟内微生态平衡的破坏。修复后微生物的生长是恢复生态平衡、维护牙周组织健康的前提条件,环境因素的改变直接影响微生物的生长,材料的某些成份可成为激活细菌成为条件致病菌的潜在因素,微生物比例的改变使条件致病菌致病成为可能,影响牙周组织的健康,导致修复失败。本研究拟从微观上尝试评价冠修复材料的组成、性能对细菌生长的影响。研究结果认为:不同材料对不同细菌生长影响不同。Plat铸造陶瓷,Vita烤瓷,冠用湿热固化塑料对粘性放线菌、具核梭杆菌、黄褐二氧化碳噬纤维菌的生长无影响,对血链球菌的生长,四种材料均有抑制作用,以SDA-Ⅱ中熔合金的抑制作用最强,Plat铸造陶瓷最弱。细菌的生长量与培养时间以及培养液中的营养条件有关,培养时间与培养液中的营养量呈负相关关系。

Artifical crown is the popularly used method in clinical restoration for the defect of the tooth. The restoration will disturb the balance of microorganisms in the gingival crevice. After restoration, the growth of the microorganisms is the essential prerequisite for recovering the microecologic balance and maintaining the periodontal health. The variation of environmental factors can directly affect the growth of microorganisms and some certain components of material may potentialy activate the bacteria, turn it into conditional pathogenic bacteria which possibily become pathogenic under the change of the proportion of microorganisms, subsequently it can affect the periodontal health and'lead to the failure of restoration. The present study was designed to evalute t,he effects of the component and property of the crown restorative materials on the growth of bacteria microscopically. The result of this study suggests that different materials can affect the bacterial growth differently. Plat castable ceramics, Porcelain- fused- to- matal, crown used heat- polymerized acrylic resin apply no effects on the growth of A. viscosus.F. nucleatum.C. ochracea;four tested materials all can inhibit the growth of S. sanguis, in which the SDA-II medium fusing metal alloy play the strongest inhibitory role, however plat castable ceramics effect was weakest. The bacterial quantity of growth relates to the culture time and the nutritional condition of the culture medium. The culture time has the negtive relation to the nutrition quantity in the medium.