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In situ anticariogenic activity of free fatty acids after sucrose exposure to oral biofilms formed on enamel

机译:蔗糖暴露于牙釉质上形成的口腔生物膜后,游离脂肪酸的原位防龋活性

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Purpose: To test whether the effect of sucrose on enamel is hampered by immediate free fatty acids exposure to the oral biofilm formed under a highly cariogenic environment, in situ. Methods: A split-mouth, cross-over and double-blind in situ experiment was carried out with 11 volunteers who wore palatal appliances containing bovine enamel slabs. In two 15-day phases, volunteers dripped 20% sucrose onto the slabs eight times per/day for 5 minutes followed by 5 additional minutes with suspensions of 10 mM oleic, linoleic or stearic acid or sucrose (caries-positive control), four times/day. Biofilms were analyzed for biomass, bacteria and polysaccharide formation and enamel demineralization was estimated by surface microhardness. Results: Biofilms exposed to oleic and linoleic acids showed significantly lower biomass than the control. S. mutans counts were reduced upon linoleic acid exposure (P < 0.05). All free fatty acids reduced polysaccharide formation (P < 0.05). Slabs exposed to 20% sucrose followed by free fatty acids had significantly lower demineralization than those exposed to sucrose alone, with reductions of 33%, 27% and 20% for linoleic, oleic and stearic acid, respectively. Data suggest that unsaturated free fatty acids exposed after sucrose might potentially reduce cariogenicity of the oral biofilm formed on enamel in situ, but further clinical confirmation is required.
机译:目的:测试蔗糖对牙釉质的作用是否被游离脂肪酸直接暴露于在高度致龋的环境下形成的口腔生物膜中所阻碍。方法:对11名志愿者进行了裂口,交叉和双盲原位实验,这些志愿者穿着装有牛牙釉质板的pa具。在两个为期15天的阶段中,志愿者每天将8%的20%蔗糖滴到平板上,持续5分钟,然后再用10 mM油酸,亚油酸或硬脂酸或蔗糖的悬浮液(龋齿阳性对照)再滴加5分钟(四次) /天。分析生物膜的生物量,细菌和多糖形成,并通过表面显微硬度评估牙釉质脱矿质。结果:暴露于油酸和亚油酸的生物膜显示出明显低于对照的生物量。亚油酸暴露后变形链球菌计数降低(P <0.05)。所有游离脂肪酸均减少了多糖的形成(P <0.05)。暴露于20%蔗糖然后游离脂肪酸的平板比单独暴露于蔗糖的平板具有显着更低的脱矿质性,亚油酸,油酸和硬脂酸分别降低了33%,27%和20%。数据表明,蔗糖后暴露的不饱和游离脂肪酸可能会降低原位在牙釉质上形成的口腔生物膜的致龋性,但需要进一步的临床证实。

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