In this present study, we try to investigate the effect of three different water to the demineralization of several tooth
minerals, such as calcium (Ca), magnesium (Mg), phosphorus (P), and fluor (F). Tooth samples were taken from 24 human
maxillary premolars 1 free of caries and defects. All the tooth samples were extracted in Dental Faculty, University of
Lambung Mangkurat, Banjarmasin, South Kalimantan, Indonesia. A water sample is taken from Martapura river, and
households that used a tap and well water in Martapura, Banjar District, South Kalimantan, Indonesia with pH value around
5.8, 6.99, and 7.11 respectively. For the control, we used an aquades with the pH value is about 7.2. Tooth samples then
divided into four groups with; C served as control; T1 which submerge the tooth in river water; T2 which submerge the
tooth in tap water; and T3 which submerge the tooth in a well water. The treatment lasts for 4 days, and each day the
demineralization rate constant and regression coefficient of Ca, Mg, P, and F was analyzed. Generally, the tooth submersion
in river water increased the demineralization rate constant of all tooth minerals that investigated in this study. The results
also show that the treatment shows a negative correlation with demineralization process of all tooth minerals. The results
of this present study indicated that all treatment can cause the demineralization of tooth mineral such as, Ca, Mg, P, and F.
The highest demineralization rate was found in the treatment with river water than another treatment.
An Experimental Study on the Grinding Rate Constant of a Ball Mill. The Effects of Feed Size and Ball Diameter.
