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Preventive Dentistry

Preventive Dentistry. (Lecture 10) Other caries preventive factors Dr Caroline Mohamed. Outline of lectures. OTHER CARIES-PREVENTIVE FACTORS Fluorides Topically applied fluoride Systemically administered fluoride

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Preventive Dentistry

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  1. Preventive Dentistry (Lecture 10) Other caries preventive factors Dr Caroline Mohamed D Caroline Mohamed

  2. Outline of lectures OTHER CARIES-PREVENTIVE FACTORS Fluorides Topically applied fluoride Systemically administered fluoride Fluorides agents and compounds for topical use Delivery systems for topical self-application of fluoride Other oral hygiene aids Delivery systems for professional topical application of fluorides D Caroline Mohamed

  3. Topical Applied Fluoride • The posteruptive cariostatic effects of fluoride are correlated with : • fluoride concentration as well as with • total exposure time. The latter is also influenced by the "substantivity" of fluoride in the oral cavity. D Caroline Mohamed

  4. Fluoride clearance fases. • First within 1 hour. • The analysis of saliva after a single application of a fluoride dentifrice or mouthwash shows that much of the retained fluoride is cleared from the mouth within 1 hour. • Secondary clearance phase of 2 hours or more. • The salivary fluoride concentration decreases more slowly. • The initial rapid clearance phaseis the result of salivary washout and the second phase is initiated by the release into saliva of fluoride initially retained in oral reservoirs.(Duckworth et al, 1991, 1994) D Caroline Mohamed

  5. Potential reservoirs are: • the teeth, • the plaque, • the soft tissues of the gingiva, • the tongue, • the cheeks, and • stagnation zones between the teeth, under the tongue, and in the buccal sulcus. D Caroline Mohamed

  6. From a cariostatic aspect, the most important fluoride reservoirs are: • CaF2 and • fluoride bound to plaque bacteria. D Caroline Mohamed

  7. The most important effects of posteruptive (topical) use of fluoride are: • the inhibition of demineralization and • enhancement of remineralization. • Fluoride exerts physiochemical effects in: • the oral fluids, such as the interrod and intercrystalline fluid, pellicle fluid, plaque fluid, and saliva, • bound in CaF2, FA, and FHA (fluorohydroxyapatite). D Caroline Mohamed

  8. Fluoride also: • reduces acid formation in the dental plaque, • may reduce plaque formation rate and plaque adhesion, and • may change the ecology of the plaque microflora. Of these effects, the most important is the reduction of acid formation. D Caroline Mohamed

  9. The fall in plaque pH following sucrose exposure is reduced when plaque fluoride content has been enhanced by repeated topical treatment. • Fluoride alone is inadequate to completely arrest caries process because its cariostatic effect is limited. • If plaque pH falls below about 4.5 , the plaque fluid becomes undersaturated with respect to fluorapatite, and demineralization will occur, regardless of the presence of fluoride. D Caroline Mohamed

  10. Systemically administered fluoride • The cariostatic effect of fluoride is almost 100% posteruptive (topical effect). • Fluoride has been systemically administered in: drinking water, salt, milk, tablets, lozenges, chewing gums, drops. D Caroline Mohamed

  11. Different concentrations of sodium fluoride have been used in these delivery systems. • Fluoridated drinking water is the most cost-effective public health measure for prevention and control of caries and remineralization of early enamel caries. • This is due to the fact that most people drink water several times a day with even those without regular dental care and regular use of fluoride toothpaste benefit from water fluoridation. D Caroline Mohamed

  12. Water fluoridation should therefore be recommended in all populations in which there is a relatively high caries prevalence, poor oral hygiene, and a lack of organized preventive programs or daily use of fluoride toothpaste. • The recommended fluoride concentration in temperate climates, is 0.7 to 1.2 mg of F/L, but in warm to hot subtropical and tropical regions, only 0.5 to 0.7 mg of F/L is recommended, to prevent the development of esthetically unacceptable fluorosis. D Caroline Mohamed

  13. Results from early studies with fluoridated water showed about 50% caries reduction in the permanent dentition and 40% in the primary dentition, compared to control areas. Significant reductions in root caries were also seen (Murray et al 1991). • At that time, caries prevalence was high in the United States and in Europe, where the studies were run, and few topical agentssuch as toothpaste and mouthrinses were available. D Caroline Mohamed

  14. Nowadays, the supplementary effect of fluoridated drinking water would be only 5% to 25% in most European countries and the USA, because of improved oral hygiene and daily use of fluoride toothpaste and other topical fluoride agents, which have resulted in very significant reductions in both caries prevalence and incidence. • However, in regions with relatively high caries prevalence, limited dental resources, and no daily use of fluoride toothpaste, water fluoridation should still achieve about 50% caries reduction. D Caroline Mohamed

  15. However, only about 3% of the world population has access to fluoridated drinking water, mostly in the USA, where caries prevalence is low and almost 100% of the population use fluoride toothpaste and other topical fluoride agents daily. • The use of the other fluoride delivery systems in the world is marginal (salt, 0.6%; tablets, etc 0.3%). D Caroline Mohamed

  16. Prevalence of dental fluorosis • an increase in the prevalence of dental fluorosis has been noticed. • The increase is in the mild and very mild forms of fluorosis, and is proportionally greater in non-fluoridated areas than in fluoridated areas. • This is because of the increase in the mean fluoride intake from all sources since the 1940s.

  17. Some of the reasons that were postulated for the increase in the prevalence of fluorosis • widespread use of fluoride in both fluoridated and non-fluoridated communities. • Foods and beverages may be processed in fluoridated communities but are shipped, sold, and consumed in non-fluoridated communities. • Hallo effect

  18. Worldwide distribution • Endemic in 22 countries • in Asia, India and China are worst affected • Mexico in North and Argentina in Latin America • East and North Africa are also endemic

  19. Risk factors • The most important risk factor in determining fluorosis occurrence and severity is the total amount of fluoride consumed from all sources during the critical period of tooth development. • Demographic risk factors: • Age: fluorosis is related to the ingestion of F during critical period of tooth development. • SES : fluoride intake from tooth paste and infant formula can vary by SES status

  20. Optimal levels of fluoride drinking water • It was accepted that optimal level of fluoride in drinking water was 1PPM. • With other sources of fluoride now days this level become 0.5 to 1 ppm according to the community. • Waters with high levels of fluoride content are mostly found at the foot of high mountains and in areas where the sea has made geological deposits.

  21. Known fluoride belts on land include: • one that stretches from Syria through Jordan, Egypt, Libya, Algeria, Sudan and Kenya, • and another that stretches from Turkey through Iraq, Iran, Afghanistan, India, northern Thailand and China. • There are similar belts in the Americas and Japan. In these areas fluorosis has been reported.

  22. Fluoride dietary supplement • Was used in non fluoridated areas • There is strong evidence that fluoride supplements are risk factor to mild to moderate fluorosis. • The risk is high in fluoridated areas.

  23. Early use of fluoride tooth paste • Young children in whom the swallowing reflex is not fully developed can ingest up to 0.3 –o,5mg F at each brushing. • The risk is not as high as fluoride supplement

  24. Infant formula: B/C its own F content and especially because it is mixed with fluoridated water. • Other factors that have been associated with susceptibility of populations to dental fluorosis are altitude, renal insufficiency, and possibly malnutrition.

  25. Dietary supplements • Fluoride dietary supplements were first introduced in the late 40´s and were intended as a substitute for fluoridated water for children in non-fluoridated areas. • Supplements contain fluoride from 0.25 , 0.5 to 1.0 mg usually as sodium fluoride or calcium fluoride, acidulated phosphate fluoride or potassium fluoride. • The original pills have been joined by chewable tablets and lozenges. D Caroline Mohamed

  26. Animals experiments shown that fluoride given once a day is more likely to cause fluoroses than the same ammount of fluoride given intermittently. • In Europe, it is recommended that a dose of 0.5 mg F/day should be prescribed only to children living in areas with water supplies containing less than 0.3 ppm F, who are considered to be high risk, after a diet analyses, starting only at age of 3 years. • THE FLUORIDE SUPPLEMENT HAS NO PLACE IN PUBLIC HEALTH D Caroline Mohamed

  27. American Dental Association. Fluoride and fluoridation. Available at: www.ada.org/public/topics/fluoride. Accessed June 20, 2007. D Caroline Mohamed

  28. The aim of using fluoride tablets is to achieve a supplementary posteruptive cariostatic effect similar to that provided by other topical fluoride agents, such as toothpaste. • Therefore, slow release lozenges should be recommended because of the prolonged fluoride clearance time in the oral fluids. • An optimal effect should be achieved if the lozenges are used as a "dessert" directly after meals, particularly in adults with reduced salivary secretion rates. D Caroline Mohamed

  29. For very caries-susceptible patients fluoride chewing gum should be the preferred systemic agent, to be used for 15 minutes directly after every meal. • It is recommended primarily for caries-susceptible adults with reduced salivary secretion rates and for caries-susceptible children and young adults, especially during the eruption of molars (5.5 to 7 years and 11.5 to 13 years). D Caroline Mohamed

  30. Fluoride agents and compounds for topical use • The caries-preventive effect of most topical fluoride measures to range between 20% and 40%. • Topical fluoride agents are available for selfcare or professional application (eg, by dentists, dental hygienist or dental assistant). • For selfcare, the fluoride agents can be used: toothpastes; toothpicks, dental tape, and dental floss; mouthrinses; gels, artificial saliva, lozenges, and chewing gum. • Professionally applied fluoride agents are paints; gels; prophylaxis pastes; varnish, glass-ionomer cement (GC), and other slow release agents. D Caroline Mohamed

  31. Toothpastes The cariostatic effect of fluoride toothpastes was recognized more than 40 years ago. More than 90% of toothpastes in the industrialized countries contain fluoride (WHO 1994). D Caroline Mohamed

  32. Fluoride toothpaste is by far the most frequently used topical fluoride agent, used by 450 million people (WHO 1994). • Only 20 million people use mouthrinses or tablets, while 20 million receive professional applications of fluoride (WHO 1994). D Caroline Mohamed

  33. The main functions of toothpastes are to facilitate mechanical plaque removal by brushing and to serve as vehicles for active agents (fluorides, chemical plaque control agents, anticalculus agents, etc.). D Caroline Mohamed

  34. D Caroline Mohamed

  35. Fluoride • The use of fluoride dentifrices has reduced the incidence of caries by 9.7%–24.9%1 • Sodium fluoride (NaF) and sodiummonofluorophosphate (MFP) are the most common sources of fluoride in dentifrices • These can be used alone or in combination 1. Twetman S, et al. Acta Odontologica Scandinavica 2003;61;6:347-355.2. Volpe AR, et al. Am J Dent. 1993;6:S13-S42.3. Sullivan RJ, et al. J Clin Dent. 1995;6:135-138.

  36. Fluoride formulation factors and mode of action • Not all fluoride toothpastes are the same • Different fluoride source, pH and choice of formulation can affect fluoride uptake1,2 • Fluoride needs to be deposited and slowly released to be effective following brushing3 • The amount of fluoride released into saliva and adsorbed by enamel during the period after brushing is critical 1. Friberger P. Scand J Dent Res 1975:83;339-344.2. White DJ, et al. Caries Res 1986;20:332-336.3. ten Cate JM. Eur J Oral Sci 1997;105:461-465.

  37. Many different fluoride compounds are used in agents for self-care and professional application. The three main categories are: 1. Inorganic compounds, including NaF, stannous fluoride (SnF2), ammonium fluoride (NH4F) etc. The salts are readily soluble, providing free fluoride. 2. Monofluorophosphate-containing compounds, such as sodium monofluorophosphate (Na2FPO4): The fluoride is covalently bound in the FPO32- ion and apparently requires hydrolysis to free the F-. 3. Organic fluorides,such as amine fluoride, and silane fluorides. D Caroline Mohamed

  38. Ionic compounds D Caroline Mohamed

  39. Factors that influence fluoride delivery • Fluoride source(NaF, MFP, stannous fluoride) • For example, MFP requires activation by hydrolysis by salivary phosphatase to release active F- • Fluoride concentration in formulation • Formulation properties • pH will drive different fluoride modes of action • Ingredients such as divalent cations (eg, Ca2+) can reduce the amount of available fluoride • Ingredients such as high levels of phosphates can reduce fluoride uptake

  40. Sometimes two or more of the above compounds are combined in the same topical fluoride agent. The fluoride concentration in agents for self-care, such as toothpastes and mouthrinses, varies from 0.012% to 0.15% fluoride, while up to 1 % fluoride is usedin gels. The fluoride concentration in agents for professional application is usually much higher, ranging from about 0.7% to 6.0%, which, as discussed earlier, will promote precipitation of CaF2 reservoirs. D Caroline Mohamed

  41. Fluorides mouthwashes • Stannous Fluoride- antiplaque properties • Sodium Fluoride • The stannous ion, not the fluoride, which is responsible for antimicrobial effect. • Mechanism of action: Tin from the stannous ion enters the cell, impairs the metabolism and effect the growth and adherence properties of bacteria. Week antiplaque activity . D Caroline Mohamed

  42. Delivery systems for topical self-application of fluorides The following topical fluoride agents are available for self-care: toothpastes; toothpicks, dental floss, and dental tape; mouth rinses; gels; artificial saliva; lozenges; and chewing gum. D Caroline Mohamed

  43. The following fluoride compounds are used in toothpastes: l. Inorganic fluorides • Sodium fluoride (NaF) • Sodium monofluorophosphate (Na2FPO3) • Stannous fluoride (SnF2) • Potassium fluoride (KF) • Aluminum fluoride (AlF3) D Caroline Mohamed

  44. 2. Organic fluorides • Amine fluoride (Hetaflur) • Amine fluoride (Olaflur) 3. Combinations of fluorides • Sodium fluoride + sodium monofluorophosphate • Amine fluoride + Stannous fluoride • Amine fluoride + Sodium fluoride D Caroline Mohamed

  45. Sodium fluoride and sodium monofluorophosphate are by far the most common, followed by stannous fluoride and amine fluoride. • Almost all the NaF, SnF2, and amine fluoride in toothpastes will be dissolved in the mouth during brushing, releasing optimal amounts of free F- ions. • On the other hand Na2 FPO3 initially releases fewer free F- ions, but also supplies FPO32- ions which within about 1 hour are broken by phosphate enzymes in the mouth, releasing F- ions. D Caroline Mohamed

  46. From 1955 to 1985 the standard fluoride concentration in toothpastes was about 1,000 ppm of fluoride (0.1% F=1 mg F/gtoothpaste), supplied as 0.2% Na F, 0.76% Na2FPO3, SMFP and 0.4% SnF2. • The average caries reduction achieved in various 2- to 3-year clinical studies was about 25% to 30% (Johnson,1993; Volpe et al, 1993). D Caroline Mohamed

  47. The cariostaticelfects of fluoride toothpastes are also related to accessibility and fluoride clearance in the oral fluids. • Accessibility may be improved by: • Frequent mechanical removal of dental plaque, particularly on the approximal surfaces of the posterior teeth. • Deliberate application of fluoride toothpaste to the posterior interdental spaces before approximal cleaning. • Thorough swishing with the remaining toothpaste slurry after cleaning, followed only by one brief rinse with water. D Caroline Mohamed

  48. The following measures may prolong fluoride clearance time from the oral fluids: • Using as high a fluoride concentration as possible. • Increasing the daily frequency of fluoride toothpaste. • Using the toothpaste technique recommended above. • Filling the posterior interdental spaces with fluoride toothpaste after cleaning at bedtime. D Caroline Mohamed

  49. Toothpastes containing fluoride as well as chemical plaque control agents should be recommended, particularly to caries-susceptible patients with high plaque formation rates (Plaque Formation Rate Index score 4 to 5, periodontitis, or gingivitis. ) Toothpastes containing SnF2 or amine fluoride also have documented antiplaque effects. D Caroline Mohamed

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