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Title: The release of the fluoride ions from the chosen compomer materials and glassionomer materials in the in vitro studies


Preface The development of new systems caused the appearance in 70’ glass ionomer cements. Conventional glass ionomer cements contain pulver with is deionizated glass with fluor and liquid. During next years modification conventional glass ionomer cements has been done and through addition resin have been obtained light cured glass ionomer cements. They have better physical properties – they are harder and more resistant to friction and first of all are resistant to water. Further improvement of filling materials create the appearance of compomers. The most important advantage of some filling materials is the ability of fluoride releasing into external environment. Fluor belongs to the most active chemical elements. It gets into human body with food or air. Fluor is bound with the supporting connective tissue structure of teeth, skin and hair. Fluoride is a natural component of saliva (0,4 – 26 μmol/l). In dentistry the application of fluoride has been found due to its anticariogenic activity. The most important fluoride activities on the hard tooth tissue are reduction of enamel solution, weakening of demineralization and remineralization process acceleration. Well known is also antibacterial fluoride activity. Fluoride can cause cariogenic bacteriostasis and low concentration can disturb creation of acid substances. Fluoride being active with bacterial metabolism can influence the stability of bacterial plaque composition during carbohydrate eating. Fluoride ions released from filing materials act preventive on enamel and also dentine. The present of fluoride in filling materials stabilize the pH value i.e. these materials decrease cariogenesis. The equations concerning fluoride kinetic release from glass ionomer cements, compomers and compositions were made. It was stated that the fluoride release mechanism is complicated and yet has not been explained. It was noted that the released amount of fluoride depends on the environment pH and same filling materials have an ability of catching the fluoride ions from solution if their concentration in the environment is higher than in the material. The purpose of the work The purpose of this work is the quantitative determination of fluoride ion release to the artificial saliva from glassionomer cement Fuji II LC Improved and compomer Dyract Extra. Methodology Fillings were applied to thirty cavities i.e. fifteen for each filling in prepared acrylic teeth. Cavities of equal size were made using electronic double – sided millimeter slide rule with measurement accuracy 0,01 mm made by firma Kinex. Tooth were weighted before and after filling to obtain the mass of filling material. The artificial saliva solution was made according to Fusayama prescription modified by Holland. Continuous investigations were performed during eleven days. Measurements of fluoride ions concentration were done with a fluoride ion specific electrode Orion in corporation with laboratory equipment CX – 741 Elmetron. Each day before measurements the electrode was calibrated in fresh prepared standard solutions. Concentration, mass, mechanism and fluoride release velocity were measured after 4 h, 24-28 h, 50 h, 74 h, 122 h, 170 h, 217 h, 241 h counting from the moment of submerging fillings in artificial saliva. Finishing the value pH of artificial saliva solutions where were located tested materials were evaluated. The results of the research The results of investigations showed: The concentration of fluoride ions in solution increases with time. Fluorides were released into artificial saliva solution in similar concentrations and similar way from both filling materials. The mass of released fluoride ions was essential different after nine days continuous investigations of compomer material and glass ionomer cement. During the first five days the quantity of released fluoride from glassionomer cement quickly increased in comparison to compomer material and next in ninth day quickly decreased. ; In the case of compomer material the mass released fluoride ions during entirely investigation period slowly, increased though area of both tested materials were equal. The pattern of fluoride ions releasing for both materials was different. Glassionomer cement showed initially rapid fluoride burst and later on violent its drop, but on the contrary compomer material long an continuous increase. The velocity pattern of fluoride ion releasing was for both materials different. Primary high velocities releasing of fluoride ions quickly decreased but after 19th hour the velocity essentially got slower. In the case of glass ionomer cement the releasing velocity dropped to zero and after increased in opposite direction, in the case of compomer material the velocity was constant at the very low level. The solutions pH value in with both tested filling materials were stored, increased at the end investigations. Conclusions: 1. The tested materials showed preventive, anticariogenic activities, what confirms their clinical usefulness. 2. Compomer material released more fluorides with comparison to glass ionomer i.e. these material probably is larger fluor source and provide releasing ions during longer time period. 3. Step by step increasing fluoride releasing from compomers caused probably by matrix hydrophility of these materials suggests that compomers are able better secure teeth against caries occurrence. 4. Glass ionomer material showed fluoride capture ability in solutions what might suggest that glass ionomer can serve also fluor reservoir in mouth. 5. The increase of solution pH value might testify about the influence of the examined materials on ionic bonds [H+] and establish additional mechanism of caries protection.

Level of degree:

2 - studia doktoranckie

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Degree grantor:

Wydział Lekarski


Stanisław Majewski

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tylko w bibliotece

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Biblioteka Medyczna Uniwersytetu Jagiellońskiego - Collegium Medicum

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Last modified:

Oct 8, 2019

In our library since:

Nov 21, 2012

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Edition name Date
ZB-113474 Oct 8, 2019


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