栖牙普雷沃菌的代糖产酸与致龋关系研究

Relationship between sugar metabolism and acid production and cariogenicity of Prevotella denticola

目的:探究栖牙普雷沃菌的代糖产酸与牙本质脱矿及龋病形成的潜在关系。方法:观察栖牙普雷沃菌的形态学特征;在无糖或有糖以及不同pH的培养条件下,紫外分光光度计和pH计检测栖牙普雷沃菌的生长特性,高效液相色谱法(HPLC)检测栖牙普雷沃菌上清液的有机酸含量;将牙本质切片分为对照组、磷酸组和栖牙普雷沃菌组,分别在相应分组培养基中培养1周和2周,SEM,VHM检测各组共培养牙本质的脱矿程度。结果:栖牙普雷沃菌能够发酵蔗糖、葡萄糖产酸,使其最终pH值低至4.7,琥珀酸和乙酸是其主要代谢产物。栖牙普雷沃菌具有一定的耐酸性。此外,栖牙普雷沃菌能够导致牙本质脱矿,与对照组相比,栖牙普雷沃菌组牙本质的维氏硬度值显著降低(P<0.05)。结论:栖牙普雷沃菌的致龋能力可能与其代糖产酸有关。

Objective:To explore the potential relationship between sugar metabolism,acid production and cariogenicity of Prevotella denticola.Methods:Morphological features of Prevotella denticola were observed and respectively cultured under incubation conditions with and without sugar and at different pH values.The growth characteristics of Prevotella denticola were detected by UV-Vis spectrophotometer and pH meter,the organic acid content in the culture supernatants of the cultures was detected by HPLC.Dentin slices were divided into control group,phosphoric acid group and the Prevotella denticola group and cultured in the corresponding mediu for 1 and 2 weeks respectively,the degree of demineralization of the samples was examined SEM and VHM.Results:Prevotella denticola fermented sucrose and glucose,produced acids with its final pH values as low as 4.7,Succinic acid and acetic acid were its main metabolites.Prevotella denticola was moderately acid-tolerant.Furthermore,Prevotella denticola was able to cause dentin demineralization,and the Vickers hardness value of dentin samples in the Prevotella denticola group was significantly decreased compared with the control group(P<0.05).Conclusion:The cariogenic capacity of Prevotella denticola may be related to its sugar metabolism and acid production.