The Solution of Calcium and Phosphorus from the Intact Enamel Surface

The electron microprobe was used to analyze the calcium and phosphorus concentrations of sound, acid-etched, and remineralized enamel. By use of a weak acetic acid-potassium acetate buffer, it was found that the demineralization probably affected only the first 10 micrometers of the enamel surface. This demineralized enamel was successfully remineralized by the use of a calcifying solution. The changes in calcium and phosphorus concentrations and the Ca/P ratios were determined.

Download Full-text

The effect of fluoridated and iodized salt consumption by schoolchildren on acid solubility of permanent teeth enamel

Kazan medical journal ◽

10.17750/kmj2016-359 ◽

2016 ◽

Vol 97 (3) ◽

pp. 359-363

Author(s):

R M Ahmedbeyli

Keyword(s):

Surface Layer ◽

Calcium Release ◽

Phosphorus Release ◽

Iodized Salt ◽

Enamel Surface ◽

Permanent Teeth ◽

Control Group ◽

Blue Color ◽

Acid Solubility ◽

Calcium And Phosphorus

Aim. To study the acid solubility of enamel based on calcium and phosphorus from the enamel surface layer to the acid biopsy and test of enamel resistance indicators in school-age children in the presence of biogeochemical fluoride and iodide deficiency, as well as the changes in these parameters amid the 3-year fluoridated and iodized salt consumption.Methods. Enamel solubility on calcium and phosphorus was evaluated based on calcium and phosphorus release from surface layer of permanent teeth enamel into acid biopsy. Test of enamel resistance was determined by V.R. Okushko method. The color intensity was assessed using standard 10-point blue color scale.Results.. The effect of 3-year consumption of fluoridated and iodized (300±50 mg/kg fluoride, 40±10 mg/kg iodide) salt on the acid solubility of permanent teeth enamel in 155 schoolchildren, born and living in conditions of biogeochemical deficiency of fluoride (fluoride content in water 0.02-0.08 mg/l) and iodide (iodide content in water 3.38±5.07 g/l) was studied. Consumption of fluoridated and iodized salt during 36 months contributed to the maximal calcium and phosphorus release from the enamel surface layer to acid biopsy during the study period. At the end of the follow-up period in the main group of schoolchildren in relation to the control group, the calcium release from the enamel surface layer to acid biopsy was higher by 131.3%, phosphorus - by 114.5%.Conclusion. The presence of fluoridated and iodized salt in the children diet leads to a decrease in the solubility of permanent teeth enamel and, consequently, to increase in resistance to acids.

Download Full-text

Comparison of remineralizing effect of organic and inorganic fluoride by evaluation of microhardness and quantitative analysis of calcium and phosphorus ratio on enamel surface: an in-vitrostudy

International Journal of Dental Materials ◽

10.37983/ijdm.2020.2302 ◽

2020 ◽

Vol 02 (03) ◽

pp. 75-81

Author(s):

Lokam Karthik Prasad ◽

Khwaja Moinuddin MD ◽

Nagamaheshwari X ◽

Uday kumar P ◽

Shekar K ◽

...

Keyword(s):

Quantitative Analysis ◽

Enamel Surface ◽

Inorganic Fluoride ◽

Calcium And Phosphorus

Download Full-text

Influence of Er, Cr: YSGG (2780 nm) and Nanosecond Nd: YAG Laser (1064 nm) Irradiation on Enamel Acid Resistance: Morphological and Elemental Analysis

Open Access Macedonian Journal of Medical Sciences ◽

10.3889/oamjms.2019.359 ◽

2019 ◽

Vol 7 (11) ◽

pp. 1828-1833

Author(s):

Maryam M. El Mansy ◽

Mostafa Gheith ◽

Abo M. El Yazeed ◽

Dina B. E. Farag

Keyword(s):

Laser Irradiation ◽

Acid Resistance ◽

Enamel Surface ◽

Yag Laser ◽

Group Iii ◽

Percentage Decrease ◽

Group I ◽

Ph Cycling ◽

Calcium And Phosphorus ◽

Scanning Electron

BACKGROUND: Enamel demineralisation is an initial step of the serious dental problem including dental caries, white spot lesions and dental erosion. AIM: Compare the effect of Er, Cr: YSGG (λ = 2780 nm) and nanosecond Nd: YAG (λ = 1064 nm) laser on enamel acid resistance. MATERIAL AND METHODS: Thirty non-carious human premolars, extracted for orthodontic reasons, were used. The experimental groups (n = 10 each group) were: Group I, untreated (control); Group II, Er,Cr:YSGG laser irradiation (0.75 W, 20 Hz, 140 μs, 10 s); Group III, nanosecond pulsed Nd:YAG laser irradiation (0.8 W, 10 Hz, 7 ns, 10 s). Scanning electron microscope and Energy Dispersive X-ray Spectroscopy (EDX) were used to assess acquired enamel resistance to PH cycling. RESULTS: After subjecting the three experimental groups to PH cycling, scanning electron microscopic examination revealed irregular porous dissoluted enamel surface in group I. However, groups II and III demonstrated partially dissoluted enamel surface. EDX analysis demonstrated the lowest mean percentage decrease in calcium and phosphorus content in group II followed by group III, then the highest mean percentage decrease was observed in untreated group I. One-way ANOVA revealed significant differences (p < 0.0001) between the tested groups. CONCLUSIONS: Both Er, Cr: YSSG and nanosecond Nd: YAG laser irradiation were able to improve the acid resistance of enamel. However, enamel surface treated with Er, Cr: YSSG laser showed the lowest mean percentage decrease of calcium and phosphorus (highest acid resistance).

Download Full-text

Vitamin D Deficiency and Intoxication - A concern either way

JMS SKIMS ◽

10.33883/jms.v14i2.80 ◽

2011 ◽

Vol 14 (2) ◽

pp. 40-42

Author(s):

Muzafar Maqsood Wani ◽

Imtiaz Ahmed Wani

Keyword(s):

Vitamin D ◽

Cell Growth ◽

Bone Turnover ◽

Secondary Hyperparathyroidism ◽

Vitamin D Deficiency ◽

Bone Mineralization ◽

Normal Blood ◽

Blood Levels ◽

Calcium And Phosphorus ◽

Biologic Function

Major biologic function of activated vitamin D is to maintain normal blood levels of calcium and phosphorus, thus regulating bone mineralization. Research suggests that vitamin D may help in immunomodulation, regulating cell growth and 1,4 differentiation as well as some diverse unspecified functions. Overt vitamin D deficiency leads to hypocalcaemia, secondary hyperparathyroidism and increased bone turnover, which in prolonged and severe cases may cause rickets in children and osteomalacia in elderly.... JMS 2011;14(2):40-42

Download Full-text

CHANGES IN THE METABOLISM OF CALCIUM AND PHOSPHORUS IN THE VARIOUS PHASES OF ACROMEGALY AND FOLLOWING THE IMPLANTATION OF THE PITUITARY GLAND WITH 90Y

Acta Endocrinologica ◽

10.1530/acta.0.0360161 ◽

1961 ◽

Vol 36 (2) ◽

pp. 161-179 ◽

Cited By ~ 6

Author(s):

G. M. Molinatti ◽

F. Camanni ◽

O. Losana ◽

M. Olivetti

Keyword(s):

Pituitary Gland ◽

Marked Decrease ◽

Active Phase ◽

Tolerance Test ◽

Urinary Calcium ◽

Phosphorus Metabolism ◽

Blood Calcium ◽

X Ray ◽

Calcium Retention ◽

Calcium And Phosphorus

ABSTRACT A study of calcium and phosphorus metabolism has been carried out on 13 acromegalic patients, in various stages of the disease. This study was repeated in nine patients following implantation of the pituitary gland with 90Y and in another two patients after deep X-ray therapy and suction removal of a pituitary adenoma respectively. Increased urinary calcium and phosphorus excretion was found in all the patients in whom the disease was in an active phase of evolution. The calcium tolerance test revealed a marked decrease of calcium retention in certain subjects, while in others, calcium retention was found to be increased. Such changes were not found in patients in whom the disease was in a quiescent phase. The blood calcium, phosphorus and alkaline phosphatase were found to be either normal or slightly increased. The implantation of the pituitary gland with 90Y and deep X-ray therapy induced a marked decrease of hypercalciuria, both spontaneous and induced, and of hyperphosphaturia, together with a definite improvement, of the clinical picture and glucose metabolism. It is concluded that the changes in calcium and phosphorus metabolism described above depend either directly or indirectly on a pituitary factor. They may therefore prove a reliable index for assessing pituitary growth hormone activity.

Download Full-text