Wilson R F, Ashley F P
Guy's Hospital Dental School, London, England.
J Dent Res. 1988 Jun;67(6):949-53. doi: 10.1177/00220345880670061201.
The biochemical compositions of free smooth-surface and approximal plaque were compared after 48 hours in the presence and absence of twice-daily toothbrushing and during ingestion of either high- or low-sugar diets in ten young adults. In addition, the effect of a single sugar intake on the pH of both types of plaque was investigated. The results confirmed previously reported differences in biochemical composition between free smooth-surface and approximal plaque, the concentrations of inorganic ions and carbohydrate fractions being generally lower in the approximal sample after all experimental regimens. The concentrations of calcium and phosphorus were doubled on the low-sugar diet compared with the high-sugar diet in both types of plaque. A significant decrease in carbohydrate concentrations was observed in free smooth-surface plaque in subjects on the low-sugar diet, but not in approximal plaque. Little variation was observed in the biochemical composition which could be attributed to the presence or absence of toothbrushing. The pH in free smooth-surface plaque was lower than that in approximal plaque five minutes after a sugar intake, but the situation was reversed two hours later. The results indicate that differences in composition and pH between free smooth-surface and approximal plaque are associated with reduced access to salivary and dietary influences due to diffusion limitation in the deeper layers of plaque.
在10名年轻成年人中，比较了在每日刷牙两次和不刷牙的情况下，以及在高糖或低糖饮食摄入期间，48小时后游离光滑面菌斑和邻面菌斑的生化成分。此外，还研究了单次糖摄入对两种类型菌斑pH值的影响。结果证实了先前报道的游离光滑面菌斑和邻面菌斑在生化成分上的差异，在所有实验方案后，邻面样本中无机离子和碳水化合物组分的浓度通常较低。与高糖饮食相比，两种类型菌斑在低糖饮食下钙和磷的浓度增加了一倍。在低糖饮食的受试者中，游离光滑面菌斑中的碳水化合物浓度显著降低，但邻面菌斑中未观察到这种情况。未观察到可归因于刷牙与否的生化成分的显著变化。糖摄入五分钟后，游离光滑面菌斑中的pH值低于邻面菌斑，但两小时后情况相反。结果表明，游离光滑面菌斑和邻面菌斑在成分和pH值上的差异与菌斑深层的扩散限制导致唾液和饮食影响的接触减少有关。
