fluoride ( 氟化物 ) 陳弘森 副教授 高雄醫學大學兒童牙科 07-3121101 轉 7008, 7020...
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Fluoride( 氟化物 )陳弘森 副教授高雄醫學大學兒童牙科07-3121101 轉 7008, [email protected]
學習目標 氟化物的來源 氟化物的代謝 氟化物的毒性 氟化物的應用
學習資源: Murray JJ: Appropriate use of fluoride for
human health. WHO, Geneva, 1996
FluorideFluorine
氮 Nitrogen N 拉丁文 nitrum = 硝石 1772
氧 Oxygn O 希臘文 oxy-genos = 造成酸的
1774
氟 Fluorine F 拉丁文 flurre = 流動 1886
氛 Neon Ne 希臘文 neos = 新的 1898
氟化物 (Fluoride)
Fluoride geochemistry 鹵素族第一個 陰電荷最強的元素 佔地球元素地 17 位 (0.03%)
In minerals
Fluospar (fluorite) CaF2/ 氟石 Cryolie (greenland spare, icetone)
Na3AlF6/ 冰晶石 Fluorapatite Ca5(PO4)3F/ 氟磷灰石
In foods
China tea( 中國茶 ) Chicken( 雞肉 ) Fish( 魚肉 ) Taro( 芋 )
Metabolism of fluorideBy oral
↓
Hydrofluoride acid (HF)
(Passive diffusion)
↓
Fluoride in blood(plasma)
↓
Ionic form, No ionic form
↓
Soft tissue Bones, teeth
↓
Sweat , Saliva , Breast milk Digestive juice, Urine ,stool
Organic fluoride(Inhalation anesthesia)
Halothane
Methoxyflurane
Enflurane
↓
Excreted unchanged in expired air
Toxicology of fluoride
Acute toxicity
1. Chemical burn (ulceration / necrosis)
2. Inhibit enzyme (protoplasmic poison)
3. Binds calcium (nerve action)
4. Hyperkalemia (cardiotoxicity)
Gastrointestinal
Nausea , Vomiting Diarrhea , Cramps Abdominal pain
Blood chemistry
Acidosis Hypocalcemia hypomagnesemia
Cardiovascular system
Week pulse Hypotension Pallor , shock Cardiac irregularities Utimately failure
Neurological
Paresthesia , Paresis Tetany , Coma CNS depression
Treatment
Immediate treatment Induced vomiting Protection of stomach Maintaince of blood calcium
Danger
Acute lethal dose 50 mg/kg Acute early symptoms (3 mg/kg) of 5
years old child(BW 20kg)
Chronic toxic dose
Dental fluorosis Bone fluorosis
Table4 □ Toxic effect of chromic excessive fluoride ingestion
Effect Dosage Duration
Dental fluorosis > 2 times optimal Until 5 years of age (excluding 3rd molars)
Skeletal fluorosis 10-25 mg/day 10-20 yrs
Kidney damage* 5-10 mg/kg 6-12 mos
* In animals
Dental fluorosis
Bone fluorosis
Dental benefits of fluoride
Prophylaxis of dental caries Treatment of sensitive dentine Treatment of various bone disease
Systemic
Drinking water Tablet salt Milk Tablets Drops
Topic
• Toothpaste
• Mouth rinses
• Painting solution
• Varnishes
• Sucking tablets
• Chewing gum
Table3. DIFFERENT WAYS TO DELIVER FLUORIDE
F Concentration Frequency of Application
Water fluoridation Optimal 1 ppm Continuously
Fluoride toothpaste 500~1500 ppm Twice daily
Fluoride tablets 0.25~1 mg/tablet Daily
Fluoride drops 1000~2000 ppm Daily
Rinsing solutions 250~1000 ppm Daily
Salt fluoridation 250~350 ppm Continuously
Milk fluoridation 7.5 ppm At school
Concentrated solutions 10,000 ppm Biannual
Concentrated gels 4000~12,300 ppm Biannual
Lacquers 1000~22,600 ppm Biannual
1. Improve resistance of enamel
2. Elevated rate of maturation
3. Remineralization of incipient lesion
4. Interference with microrganism
5. Improve tooth morphology
H+ + F-
H F
HF
H+ + F-
pH7 H+ + F- H F
pH 4.5 H+ + F- H F
Fig. 6. Schematic representation of fluoride entering a bacterial cell in the form of HF at lower pH values, dissociating, and thereby providing H+
and F- ions inside the cell.
2% neutral sodium fluoride (0.9% fluoride ion)
8% stannous fluoride (2% fluoride ion)
2.8% acidulated phosphate fluoride (1.23% fluoride ion)
Recommended application techniques
1. Paint ─ on technique
2. Tray technique
3. Topic electrolytic application
Mouth rinse solution
0.2% NaF / week
0.05% NaF / day
超氟牙膏: 1000 ppm 以上 含氟牙膏: 800-1000 ppm 低氟牙膏: 500-800 ppm 兒童含氟牙膏: 250-500 ppm
Zymafluor 0.25mg / Tab
100 tablets / Bot
◎ Journal of the American Academy of Pediatric Dentistry, Special Supplement 1995-1996, Vol.17, No. 6, P.24.
飲水氟含量
年齡
<0.3 ppm 0.3 – 0.7 ppm >0.7 ppm
出生 6 個月 ~ 3 歲 0.25 mg 0 0
3 ~ 6 歲 0.5 mg 0.25 mg 0
6 ~ 16 歲 1 mg 0.5 mg 0
Name Johnny Jones .
Address 128 Peaks Street Age 5 .
Buchanan, Virginia .
Rx Sodium Fluoride Tablets, 2.2 mg
(1.0 mg F)
Dispense 120 tablets
Sig. One tablet each day: chew and swish for one minute before swallowing or allow to dissovle in mouth.
Signed Robert L. Smith, D.D.S.
Duraphat®
Fluoride varnish
The outstanding preparation for
topical caries prophylaxis and
treatment of hypersensitive necks
of teeth
Water fluoridation
Powder type
Sod. fluorosilicate 氟化矽鈉 Sod. fluoride 氟化鈉
Liquid type
fluosilicic acid 矽氟酸 (H2SiF6)
1ppm[F-] = 1 mgF/l
= 1mgF/kg
= 1x10─4 %F
Water fluoridation
Growth & development Cancer death rate Down’s syndrome Mortality rate
Magnitude of increase between asymptomic and lethal dose levels of four well-know substances
Morphine Sulfate(mg)
Salicylate(g)
Digoxin(mg)
Fluoride(mg)
Asymptomic 0.3 0.1 0.1 0.1
Therapeutic 1.6~3.0 0.3~3.6 1.0 1.0
Toxic 30~60 7~13 1.2 264
Lethal 200~400 30~40 2.5 2500
% NaF x 1/2.2 = % F
% Na2PO3F x 1/7.6 = % F
% SnF2 x 1/4.1 = % F
How many ppm in 2.2% NaF (Na=23,F=19)
2.2 x ( 19 / 23 + 19 ) = X ppm .
100 1000000
X = 9952 ppm
結論 從這個課程可了解氟化物的抗齲齒作用在牙科公衛上所扮演的角色
Thanks for your listening!
中興新村 草屯
0.07ppm 0.08ppm
0.6ppm 未添加減少 40% 增加 19%(3 歲
組 )
前者較草屯減少 66% (12 歲組 )
Effectiveness of Various Modes of Administering Fluorides in Improving Dental Health
Mode Concentration of Dose % Reduction in Dental Caries
Remarks
Community water fluoridation 1 ppm (1 mg/liter)* 55-70 Continues into adult life
School water fluoridation 4.5 ppm (4.5 mg/liter)* About 40 Only for school age children
Topical application 2% NaF solution 8% stannous fluoride1.2% acidulated phosphate fluoride, or gel
30-40 For children of all ages
Mouth rinse: Home or school rinsing daily Supervised school rinsing weekly
0.05% NaF0.2% NaF
20-50 Probably more effective under supervision
Tablets 2.2 mg NaF↑ 20-40 Effective in supervised school distribution: chew, swish, and swallow
Drops 2-2.2 mg NaF total of 4-12 drops
Probably same as tablets
Latitude in partial doses
Dentrifices 0.4% stannous fluoride, 0.22 % NaF, 0.76% Na monofluorophosphate
15-30 Adults and children: may be used in fluoridated areas
* Dosage in a temperate climate.↑ No vitamin fluoride mixtures have been accepted by the ADA Council on Dental Therapeutics because they lack flexibility in altering fluoride dosage.