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• W2334628045 abstract "on of its distribution in individuals, it is prerequisite to clean the surface for biopsy removing extrinsic deposit. However, damage or alteration of the enamel surface due to abrasion should be avoided.As series of the determination of the acid resistance of the surface enamel, this study aimed at examining the influence of cleaning the tooth surface with abrasives and at refinements of the method without difficult procedures in order to evaluate the acid resistance of the surface enamel in vivo.For abrasion of the tooth surface, several abrasives were employed in this study, i. e. cleaning the tooth surface with a polishing rush. singly or by polishing with pumice, zirconium silicate, and tooth paste based on calcium carbonate or dicalcium phosphate.Observations were made on the degree and presence of the abraded surface of the enamel using a Vickers microhardness tester. The effects of cleaning by using the abrasives mentioned above in relation to calcium and phosphorus dissolved from the labial surface of upper central humann incisor were examined following successive application of agar plate (pH 4.0) for each 3 minutes.Some observations were made on the morphological changes of the surface of the enamel using a electron microscope.As results of these experiments, it was found that quantitative alteration of the surface abraded could be recognized. The depths abrased from the surface were 3-5 μ in the case of zirconium silicate abrasive and 2-3 μ in the case of pumice. Cleaning with these abrasives produced the alteration of the tooth surface increasing the dissolution of phosphorus and calcium. The results showed that tooth paste of calcium carbonate base was to be recommended for the agar plate method. Furthermore, from the results of a clinical study with the agar plate method, a suitable method can be developed to evaluate the weakness and strength of the acid resistance of the individual and to employ the determination of the enamel solubility at a lower pH than that of the agar plate method with pH 4.0.Alternative procedures using non-woven paper plates were developed by the author. The non-woven paper plates consists of two-ply plate which punched of 6mm in diameter. The plate was moistened with 0.05ml of 0.1M lactate buffer solution of pH 2.5 and applied to the labial surface of upper central incisor for 3 minutes. The determinations were done on the phosphorus dissolved from the surface enamel of 30 subjects of 6th grade children.The results showed that the distribution pattern of phosphorus extracted by means of the nonwoven paper plate method revealed a nearly normal curve.It is concluded that the non-woven paper plate method is promising for application as a suitable procedure in vivo to evaluate the acid resistance of the surface enamel with high accuracy and without difficulty." @default.
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• W2334628045 date "1974-01-01" @default.
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• W2334628045 title "Fundamental Studies on a Method of Evaluating the Acid Resistance of the Surface Enamel in vivo" @default.
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• W2334628045 doi "https://doi.org/10.5834/jdh.24.286" @default.
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