Studies on experimental calculus formation in the rat. X. The effect of various starches

An in vitro study of the effect of some dietary components on calculus formation: regulation of calcium phosphate precipitation

OBJECTIVE

We studied the effects of food components on the in vitro formation of calcium phosphate precipitates.

MATERIALS AND METHODS

The effects of food components, such as starch, soybean flour, fish meal, rapeseed oil, and coconut oil, on calcium phosphate precipitation were studied using a pH drop method.

RESULTS

Although the addition of starch had no effect on the rate of precipitation of amorphous calcium phosphate (ACP), it increased both the rate of transformation of ACP to hydroxyapatite (HAP) and the induction time (i.e. time for the initiation of transformation of ACP to HAP to occur); this was irrespective of the heat treatment of the starch. Amylopectin (insoluble constituent of starch) was effective in increasing the rate of HAP transformation, but amylose (soluble constituent of starch) was not. Oil specimen obtained from rapeseed (400 microl ml(-1)) increased the entire reaction of calcium phosphate precipitation, but that from coconut did not. Protein food, such as soybean flour and fish meal, decreased the rate of transformation of ACP to HAP and increased the induction time, while they had no effect on the rate of ACP precipitation.

CONCLUSION

These results suggest that carbohydrate and oil (both are staple diets for the humans) enhance oral calcification (dental calculus formation or re-mineralization of tooth enamel), while side dishes of protein food would decrease it.

[The formation of dental plaque in relation to the ingestion of food]

The formation of dental plaque during the consume of hard, normal and soft diet was examined on 100 children (4-6 years old) per diet group. No tooth-brushing was done during the test for two days. The average of plaque-index (by Quigley and Hein) after two days was 2.52 on hard diet, 2.69 on normal diet and 2.93 on soft diet. The differences are significant (t-test by Student, p = 0.01). The effect of physiological self-cleaning of oral cavity by diet is discussed.