A novel approach for treating fluorosis stains

Dental fluorosis is a common disease in punjab(india).it is due to an unusually high dose of fluorides during odontogenesis causing a structural modification of hard dental tissues and thereby resulting in a hypomineralisation of these tissues.fluorotic enamel is a hypocalcified, porous,brittle and most unaesthetic tissue. Bleaching has been suggested by several authors in order to treat the unaesthetic aspect of dental fluorosis, but many results are however unsatisfactory. This is a novel method which is based on the structural characteristics of the fluorotic ename & organic and exogenous nature of fluorotic enamel stains which includes four different stages:-

1) Cleansing the enamel surface with pumice 2) Enamel etching with hydrochloric acid 3) application of sodium hypochlorite. 4) application of dental adhesives.

Introduction

A frequent question asked by most of patients residing in the fluorotic belt of punjab (india) is "will my tooth turn white?" Usually the answer is a "yes" with the explanation that the modern dental treatment procedures are such as to esthetically synchronise the facial harmony of tooth structure.the reason for this discoloration is a high fluoride concentration in water in certain areas of punjab. the normal colour of permanent teeth is greyish yellow, greyish white or yellowish white but the number of people with this colour are usually limited owing to over aggressive tooth brushing and abrasive cleansing materials, acidic food and drinks and last but not the least,ageing. The elderly people thus, have more yellowish teeth as compared to younger persons.these alterations in colour maybe physiologic or pathologic and endogenous or exogenous in nature. the modern era is an era of esthetics. People having teeth with normal colour also want to have whiter teeth to improve their smile. So one cannot ignore the wishes of such patients and hence bleaching, as we know, has emerged as the simplest, most common, least invasive and least expensive means available to dentists to lighten discoloration.

History

Many agents have been used in the past and a number of new methods have continued to be introduced. It was oxalic acid first by chappel in 1877 which was followed by various forms of chlorine, until hydrogen peroxide was first used by harlan in 1884. Many advances continued focussing basically on the ways to facilitate the absorption of bleaching agent. The recent developments of hi-tech computer imaging have enhanced patient understanding, expectation and ultimately satisfaction.

Mode of action

Bleaching works by oxidation in which the bleaching agent enters the enamel &/or dentin of the discolored tooth and reduces the molecules containing discoloration. The bleaching depth depends on the cause of the stains and where and how deep the stain has permeated the tooth structure plus how deep the bleaching agent can permeate to the source of discoloration and remain there long enough to release deep stains.

Etiology of tooth discoloration

Extrinsic discolorations are found on outer surface of teeth and are usually Of local origin e.g. Tobacco, paan, tea, coffee, silver nitrate stains, oral intake of iron suspensions, continuous use of mouth washes and gum paint. Intrinsic the stains are found within the enamel and dentin and are caused by The deposition of the substances within these structures e.g. Tetracycline, Fluorosis stains, amelogenesis imperfecta, dentinogenesis imperfecta, pulp necrosis etc.

Histopathology

fluorosed teeth are also called mottled teeth . Such teeth appear when child ingests excessive fluoride during enamel formation or calcification in areas where drinking water contains more than 1ppm of Fluoride. The higher concentration of fluoride is believed to cause a metabolic alteration in the ameloblasts which results in defective matrix & improper calcification. 1ppm of fluoride has no biological side effects on The vital organs of human body i.e. Kidney, heart & lungs. Fluoride up to 4ppm in drinking water occasionally produces skeletal fluorosis but above 8ppm coupled with malnutrition positively causes not only skeletal fluorosis but irreversible bone changes & deformity as well.

Histology

histological examination shows hypomineralised, porous sub-surface enamel below a well mineralised surface layer. The most affected teeth (in decreasing order) are premolars, 2ndmolars, followed by maxillary incisors, canines & 1st molars. Mandibular incisors are affected least.

Stages of fluorosis

the appearance of teeth depends upon the severity of the lesion which in turn depends upon the fluoride contents consumed by a particular individual through the water supply.

1) the constant use of water having fluoride to the extent of 1ppm causes mildest grade of mottling in 10% of the population.

2) as concentration of fluoride increases, the effect worsens, so much so that when the concentration reaches 6ppm,incidence of mottling is 100%.

3) very mild :- in this type there are very small white areas occasionally seen on the tooth surfaces, but do not involve more than 25% of tooth surfaces.

(4) mild :- in this type there is more extensive tooth involvement and involves 50% of tooth surfaces.

(5) moderate :- more surfaces are involved here and are subjected to attrition. They show marked wear with yellow or brown pigmentation.

(6) severe :- all enamel surfaces are involved, so much so that the tooth mor phology is affected.there is discrete or confluent pitting of enamel surfaces. Brown stains are widespread & the tooth often presents a corroded surface.

Optimum fluoride levels

In cold climate, recommended fluoride levels may be as high as 1.2 ppm whereas in extremely hot climate, a level of 0.7 ppm is recommended. In moderate climate, the optimum fluoride level is 1 ppm. High temperature causes increase in mottling because there is increased consumption of water containing fluoride. Distribution of mottling in various areas of teeth has no relation with periods of mineralisation of crown. Teeth are only affected provided the child lives in the area of fluorosis during the time of enamel mineralisation. Brown tooth stains respond to treatment but white stains are not effectively resolved. It has been observed that teeth in process of eruption receive maximum benefit from optimum amount of fluoride plus teeth exposed to f shortly after eruption were also protected although to a lesser degree.

Different f levels in punjab & other states of india

I) Punjab

1) bhatinda - 4.5 ppm 2) mansa - 4.2 ppm 3) mukatsar - 3.3 ppm 4) faridkot - 3 ppm 5) ferozepur - 2.6 ppm 6) moga - 2 ppm 7) sangrur - 1.35 ppm 8) jalandhar - 0.55 ppm 9) amritsar - 0.45 ppm

10) hoshiarpur - 0.44 ppm 11) nawanshahar - 0.4 ppm 12) fatehgarh sahib - 0.37 ppm 13) patiala - 0.35 ppm 14) ropar - 0.3 ppm 15) kapurthala - 0.25 ppm 16) ludhiana - 0.22 ppm 17) gurdaspur - 0.15 ppm

II) Andhra Pradesh

1) nalgonda - 20.6ppm 2)prakasan - 12.0ppm 3)vishakhapatnam - 11.0ppm 4) anantpur - 10.1ppm 5)guntar - 10 ppm 6)medak - 9.8ppm 7)kunoor - 9.6ppm 8)nellore - 8 ppm 9)mehboobnagar - 6.4 ppm

10)warrangal - 5.8 ppm 11) kareemnagar - 4.9 ppm 12) hyderabad - 4.8ppm 13) cuddapah - 4.6ppm 14) nizamabad - 3.0ppm 15) chittoor - 2.9 ppm 16) adkabab - 2.8 ppm 17) srikakalam - 2.8 ppm 18) Godavari - 1.6 ppm

III) Gujarat

1) kutch - 1.2 -- 11 ppm 2) bhavnagar - 1.5 - 4ppm 3) jamnagar - 1.5 - 4ppm 4) rajkot - 2.5ppm 5) saurashtra - 1.5 - 2.5 ppm 6) rajpur - 0 - 2.5 ppm

7) banakanta - 1.5 - 2ppm 8) godar - 1.6 - 1.7ppm 9) godhra - 0 - 1.6 ppm 10) surinderanagar - 0 - 1.5 ppm 11) surat - 0 - 1.3 ppm

IV) Tamil Nadu
1) Coimbatore 2) Dharampur 3) Madurai 4) Narkot 5) Salem 6) Trichi
all 1.5 --- 5ppm

V) Kerala
1) Allepey 2) Eranakulam 3) Quillon 4) Trichur
all 0 -- 1.5 ppm

V) Rajasthan

1) Bharatpur - 28ppm 2) Tonk - 21ppm 3) Alwar - 20.6ppm 4) Sikar - 19.1ppm 5) Ajmer - 18.4ppm 6) Bhilwara - 16.5ppm 7) Swaimadhopur - 16.1ppm 8) Jhalawar - 16ppm 9) Churu - 16ppm 10) Jodhpur -16ppm 11) Sirohi - 15.8ppm 12) Jaipur - 15ppm 13) Nalpur - 14.2ppm

14) kota - 14.2ppm 15) dungarpur - 12ppm 16) bikaner - 10.2ppm 17) barmer - 10ppm 18) pali -- 9.1ppm 19) ganganagar - 9ppm 20) jalour -- 8ppm 21) wagpur - 7.1ppm 22) chittorgarh - 6ppm 23) bundi - 5.8ppm 24) banswara - 4.3ppm 25) jhunjhunu - 2.2ppm

VI) Uttar Pradesh

1) Gorakhpur - 0.6-6.8ppm 2) Shahjahanpur - 4ppm 3) Lakhpur -0.1-4ppm 4) Rai bareilly - 0.6-3ppm 5) Banda - 0.6-3ppm 6) Agra - 0.2-3ppm 7) Kanpur - 0.2-3ppm 8) Varanasi - 0.2-3ppm 9) Unna - 0.1-3ppm 10) Aligarh - 0.4-2ppm 11) Allahabad - 0.2-2ppm 12) Itah -0.8-1.6ppm 13) Hamirpur - 0.6-1.6ppm 14) Azamgarh - 0.1-1.6ppm 15) Muradpur - 1.0-1.4ppm 16) Jamalpur - 1.0-1.2ppm 17) Lucknow - 0.8-1.2ppm 18) Meerut - 0.4-1.2ppm 19) Bulandshahar - 0.4-1.2ppm 20) Dijnor - 0.2-1.2ppm 21) Jhansi - 0.2-1.2ppm 22) Bareilly 0.1-0.9ppm 23) Balliya - 0.4-0.8ppm 24) Barabanki - 0.4-0.8ppm

25) fatehgarh - 0.4-0.8ppm 26) mirzapur - 0.4-0.8ppm 27) gadhepur - 0.3-0.8ppm 28) gonda - 0.2-0.8ppm 29) basti - 0.2-0.8ppm 30) jalpum - 0.1-0.8ppm 31) dehradun - 0.1-0.8ppm 32) pratapgarh - 0.4-0.6ppm 33) manipuri - 0.4-0.6ppm 34) lahtpur - 0.1-0.6ppm 35) muzaffarnagar - 0.2-0.5ppm 36) rampur - 0.2-0.4ppm 37) pilibhit - 0.2-0.4ppm 38) bijnor - 0.1-0.4ppm 39) fatehabad - 0.1-0.4ppm 40) badari - 0.1-0.4 ppm 41) sitapur - 0.1-0.4ppm 42) saharanpur - 0.1-0.4ppm 43) mathura - 0.1-0.4ppm 44) faizabad - 0.2ppm 45) etawah - 0.1-0.2ppm 46) nainital - 0.1-0.2ppm 47) dahrich - 0.1-0.2ppm 48) sultanpur - 0.1ppm

Treatment options

Basically for all these stains or in particular fluorotic stains the treatment options available to us include :-

1) Veneering / laminates or placement of porcelain crowns 
2) Micro / macroabrasion 
3) Bleaching - a) vital tooth inoffice bleaching b) nightguard home bleaching c) our novel method of inoffice bleaching

1) Veneering or laminates or ceramic crowns

Advantages:
1) esthetically more acceptable
2) Long lasting
3) Durable
4) Simple
5) Can be given over endodontically treated tooth
6) more strength and resistance to forces

Disadvantages:
1) brittle
2) less shear strengh
3) causes loss of tooth structure
4) patient may not be willing
5) susceptible to fracture
6) due to tooth reduction, pulp & other tissues may face trauma
7) overcontouring may make it appear & feel unnatural
8) vitality tests cannot be done once crowns are properly fit
9) post cementation caries difficult to detect
10) lab.procedure needs precision for proper marginal seal
11) gingival irritation- may cause hyperaemia & bleeding

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2) Micro/ Macro abrasion :-

This technique involves applying of 18% hcl to soften the enamel And then abrading it with a controlled abrasive technique With pumice to remove superficial stains / defects. Instead of pumice, even silicon carbide may be used with 11%hcl.

Advantages:
1) improved method for superficial stains
2) safer method
3) involves physical removal of tooth structure

Disadvantages:
1) can cause sensitivity
2) causes wearing of tooth structure
3) patients might not allow cutting of tooth structure
4) defect may persist after finishing of technique for which a restorative alternative is needed

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3) Bleaching :-

This procedure has many methods and techniques involving various solutions in each technique.

Advantages:
1) easy
2) time saving
3) cheaper
4) patient acceptance better
5) can be carried out both in office & at home

Disadvantages:
1) requires patient cooperation(especially for home bleaching)
2) cannot be used where teeth have large pulps
3) cannot be used where teeth are too dark
4) cannot be used where the patient expectations are too high
5) cannot be used in impatient patients
6) causes cervical resorption
7) cannot be used in attritioned teeth which might cause sensitivity
8) cannot be used where teeth are bonded, laminated or have extensive restorations
9) not a perfect technique & merely changes colour to variable depths
10) lasts for only 1 - 3 years (short period)

A) Vital tooth inoffice power bleaching
This technique uses a combination of 37% phosphoric acid & 35%hydrogen peroxide.the oxidation reaction is generally promoted by a heated instument or with intensive light.in this method, one application is carried out weekly for 2 - 6 appointments with each treatment lasting 30 minutes. Use of phosphoric acid by this technique is optional.

Advantages:
1) caustic chemicals are totally under dentist's control.
2) soft tissue protection is better achieved by dentist.
3) bleaching of tooth is achieved more rapidly

Disadvantages:
1) slightly costly procedure.
2) unpredictable results.
3) uncertain duration of treatment
4) soft tissue damage possible for both dentist & patient.
5) rubber dam causes discomfort.
6) can cause post operative sensitivity.

B) Night guard home bleaching
This procedure involves making an impression of the teeth & pouring a cast of the same, trimming of the cast, application of a blockout resin & fabrication of a night guard tray by a vaccum former machine. After cooling, the tray is trimmed & a 10 - 15% gel of carbamide peroxide is recommended for the same. In this procedure the total treatment time is 2 - 6 weeks.

Advantages:
1) use of lower concentration.
2) ease of application.
3) minimal side effects.
4) lower cost (as compared to veneers)
5) lesser chair time.
6) much lesser labour intensive.

Disadvantages:
1) have to rely a lot on patient compliance for results.
2) longer treatment time.
3) unknown potential for soft tissue changes with excessive use.
4) treatment results are time & dose dependent.
5) peroxide solution may cause irritation of gingival papilla.
6) teeth become sensitive to temperature changes.

Another method using macken's solution has been described
1 part anaesthetic ether 0.2 ml - removes surface debris 5 parts hcl 38% 1ml --- etches 5 parts hydrogen peroxide 30% 1 ml --- bleaches

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Our Approach For Inoffice Bleaching

Indications:
1) Fluorosis stains / systemic fluorosis
2) Tetracycline stains

Contra indications:
1) Hyperaemic gingiva
2) Persistant periodontal problem cases
3) Fractured incisors / anteriors

Clinical application
The various steps are
1) Cleansing
2) Isolating
3) Etching
4) Rinsing
5) Dehydration
6) Application of solution
7) Scrapping
8) Rinsing
9) Filling

The Steps in detail:
1) cleansing the tooth surface with a nylon tooth brush & a mixture of pumice and water to remove surface debris.
2) isolation is done by application of rubber dam.
3) then dry the tooth surface & do enamel etching with 35% hcl for 20 - 25 seconds.
4) copious rinsing is done to eliminate acid residues & the tooth is subjected to thorogh drying.
5) application of 95% ethyl alcohol to dehydrate the enamel surface.
6) now,the application of 30% hydrogen peroxide(h2o2) is done first for 1 minute followed by alternative application of 5.25% sodium hypochlorite (naohcl) is done for 5 minutes during which it can be re-applied to the tooth surface to keep it wet.
7) the removal of staining molecules can be accelerated by gently scrapping the tooth surface.
8) this is followed by thorough rinsing of tooth surface.
9) this procedure is repeated at the interval of three days for successive sittings till the results are satisfactory.
10) in the end, fill the microcavities caused in the tooth by this solution with a light cure dental adhesive.

Advantages:
1) HCl etches enamel,but does not penetrate.
2) Tooth structure is not damaged.
3) Very very few chances of post - operative sensitivity of tooth.
4) No heat / application is required.
5) Very economical as all the three solutions in quantity of 50 ml. Each cost rs. 250 - 300 (total ).
6) Very low quantity of solutions required at each sitting.

Disadvantages :
1) Fluorosed teeth require larger & repeated sessions to decolorise Them.
2) Some blanching of gingiva can occur which is reversible within Half an hour.
3) Transitory decrease in bond strengh occurs when composite is applied to bleached / etched enamel.however,after a week,no decrease is seen.
4) Unknown duration of treatment.

Discussion

The different hypothesis concerning the fluorotic stains removal are:
1) if a fluorotic tooth is put into a naohcl solution,it removes all the stains within a few hours.this confirms the organic & exogenous nature of fluorotic tooth stains which are due to elementary impregnation of a hypocalcified & porous tissue. said by :- triller m. Alterations des tissues by marie curie in 1984.
2) scanning electron microscope study (sem) study shows that Posteruptive calcified layer covers the fluorotic enamel surface ; hence the mineral layer removal is essential.

Conclusion

In the end, i would like to conclude that this system of stains Removal seems to be clinically applicable & satisfactory with minimal abrasion of enamel surface.to make this technique Universally acceptable , lot of cases have to be treated with this technique.

Here is another excellent paper on treating fluoride stains by resin infiltration ...CLICK HERE

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