welding safety toolbox talk, specifically dealing with the hazards associated with hot metals during welding, that are properly guarded against with PPE.
#safety
#toolboxtalk
welding safety toolbox talk, specifically dealing with the hazards associated with hot metals during welding, that are properly guarded against with PPE.
#safety
#toolboxtalk
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
For More Medicine Free PPT - http://playnever.blogspot.com/
For Health benefits and medicine videos Subscribe youtube channel - https://www.youtube.com/playlist?list=PLKg-H-sMh9G01zEg4YpndngXODW2bq92w
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
For More Medicine Free PPT - http://playnever.blogspot.com/
For Health benefits and medicine videos Subscribe youtube channel - https://www.youtube.com/playlist?list=PLKg-H-sMh9G01zEg4YpndngXODW2bq92w
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Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
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June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
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This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
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Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
1. BY DR MARIA SAEED
PGR DERMA
CMH OKARA
SPECIFIC ALLERGENS
ALLPPT.com _ Free PowerPoint Templates, Diagrams and Charts
ROOK’S
DERMATOLOGY
pg 128.19 to 1
28.27
4. 1.NICKLE
Points of discussion
Chemistry
incidence and prevelance
occurrence
clinical features
Avoidance
Prognosis
specific therapies
patch test
5. CHEMISTRY
• metal itself sensitizes
• nickel chloride (NiCl2 ) and
nickel sulphate (NiSO4 ),are
readily soluble in water and
sweat and have strong
sensitizing properties.
• Some oxides (e.g Ni2O3)
and the hydroxide (Ni(OH)2)
can elicit contact dermatitis
Incidence and prevelance
• common in women
• Prevalence tends to rise in
age of 10 yrs onwards
• Ear piercing is a significant
risk factor for the
development of nickel
sensitivity
• Prevalence is higher in
occupational groups e.g in
hair dressers.
6. OCCURRENCE
commonest sources of metallic nickel are alloys and plated objects
sensitization from nickel plated items eg.nickel‐iron, German silver
Chromium‐plated metal is often first nickel‐plated, and after long use the nickel may reach
the surface, for example on water taps.
repeated exposure to occluded metal items releasing nickel
exposure may occur from handling coins, keys, scissors, knitting needles, thimbles ,
scouring pads and other metallic tools and utensils
Jewellery and metal components of clothing
Platers and some metal machinists are necessarily at risk of occupational nickel allergy
7. Cont’d
Other sources include:
pigments in glass, pottery and enamel,
electrocautery plates
mobile phones laptop computers
bindi
intravenous cannulae
tattoo pigment
Orthodontic appliances
metal scouring pads
even soaps and detergents
Nickel has been identified in some eye cosmetics
Allergic contact dermatitis to nickel
in metal studs on jeans
8. Cont’d
Systemic exposure:
from diet (certain food and plants)
domestic water
nickel may also be a contaminant in
fertilizers and fungicides
Stainless steel saucepans release
negligible nickle
Secondary eyelid dermatitis in a
patient sensitive to nickel
9. Clinical features
patches of dermatitis at sites of contact with metal objects
eruption may be papular, nummular, diffuse
consist only of excoriated papules on almost normal‐looking skin
secondary eruptions which is spread of dermatitis to distant areas
secondary rash normally starts shortly after, or at the same time as,the primary eruption.
10. Relationship between hand eczema and nickel
Nickel‐sensitive women do appear to have a
predilection for hand eczema.
Wet work, atopy and nickel sensitivity are associated
with an increased risk of hand dermatitis.
Hand eczema is often multifactorial Common in house working
women. With vesicular palmar (dyshidrotic)pattern ,
personal care items, detergents and cleaning products do not
contain sufficient nickel
Ingestion of nickel sulphate caused a flare of vesicular hand
eczema
Hand
eczema
Nickel
sensitivity
11. AVOIDANCE
• Nickel cannot be entirely avoided in daily life.
• Waterproof tape and metal lacquer can be used to cover nickel‐plated objects
• Protection with rubber gloves may be insufficient
• Heavy‐duty vinyl gloves have been suggested as an alternative
PROGNOSIS
• Excellent prognosis in case of jewellery and clothing
• Once the hands are involved, the eczema may remain chronic, persistent or intermittent
SPECIFIC THERAPIES
•Barrier creams and cleansers containing chelating agents
•Dietary reduction of nickle
•Clioquinol is known to chelate nickel
•topical clioquinol–steroid combination
•Treatment with tetraethylthiuramdisulphide (disulfiram; Antabuse
12. Nickel sulphate 5% in petrolatum is used for patch tests
False negative reactions are common with 2.5% nickel in petrolatum
May produce irritant false positive reactions with a deep erythema and
pustulation
Some follicular reactions are irritant, but those with raised papules are
often truly allergic
Patch testing
13. 2. COBALT
Points of discussion
Chemistry
incidence and prevelance
occurrence
clinical features
Avoidance
Prognosis
patch test
14. chemistry
• Cobalt metal and its
oxides (e.g. Co2O3 and
CoO) and salts (e.g. CoCl2
and CoSO4) are
sensitizers.
• heated CoO elicits positive
patch test reactions
(unlike NiO).
Prevalence
• females predominating
• Of patients with
dermatitis, 4.6–9% were
patch test positive
15. OCCURRENCE
Metallic cobalt is present in ‘hard metal used for metal cutting and drilling.
used in magnets and jewellery.
It is always present as a contaminant in nickel.
It occurs in alloys, for example vitallium used in dentures and in nails for pinning fractures.
Cobalt oxides present as traces in cement, are sensitizers.
Cobalt salts are used for plating ,unlike nickel salts, although cobalt chloride has sensitized in
a metal‐etching solution.
Organic compounds(e.g cobalt naphthenate, resinate, stearate)are used as driers in paints and
varnishes, bonders of rubber to metal and accelerators for unsaturated polyester resin
They may also be present as additives in lubricating oils.
17. Clinical features
clinical features of cobalt allergy can be identical to those of nickel allergy
its presence in cement may induce a clinical pattern identical to allergy from chromate
Isolated cobalt allergy is seen in hard‐metal workers and in the pottery and glass
industries when it is usually associated with hand dermatitis
Stomatitis
Allergic granulomatous reactions to tattoo pigment
Animal feed may induce contact allergy
Photocontact dermatitis
An oral lichenoid eruption to a chrome/cobalt prosthesis
Vitamin B 12 is a cobalt‐containing compound and can cause cheilitis
18. •depend on identifying a
relevant cause and
eliminating contact
•Reduction of the dietary
intake of cobalt
(monitoring plasma
vitamin B12 if prolonged)
Avoidance
•Concomitant cobalt and
chromate sensitivity cause
troublesome dermatitis
•Same goes for cobalt
nickel sensitivity
Prognosis •Cobalt chloride 1% in
petrolatum is reliable for
testing
•False positive, irritant,
purpuric reactions are
common ,especially in
atopics
Patch testing
19. 3. Chromium
Points of discussion
Chemistry
incidence and prevelance
occurrence
clinical features
Avoidance
Prognosis
patch test
20. Chemistry
•The metal itself, if not dissolved in
oil or acids or as a salt, seems to
be non‐sensitizing, unlike nickel
and cobalt.
•Hexavalent chromate, trioxide
(CrO3),dichromates of potassium,
sodium and ammonium are
common sensitizers
• less soluble lead chromate, barium
chromate and zinc chromate
(ZnCrO4) are also allergenic
•.trivalent chromium compounds
(occurring as cations), for example
chromium trichloride (CrCl3), are
sensitizers
Prevalence
•Commoner in men than in
women
•Incidence higher with
occupational dermatitis
21. Occurrence
main source of hexavalent chromium is cement
antirust paints (lead chromate and zinc chromate)
including dust liberated by drilling, cutting or sandpapering of painted metals.
plating salts
metal alloys
lithography/offset printing materials,
Anticorrosive oil, cutting oils, cooling water, foundry sand
polysulphide sealants
matches
photographic chemicals
chemicals for fat determination in milk
welding fumes
22. Cont’d
wood preservatives,wood ashes, wood pulp
mordant in wool dyeing
stains in glass
glazing enamels
catgut
violin strings
Coating on zinc‐galvanized iron sheets
textiles
glass polishing
flour
tyre‐fitting solution
colour television manufacture
soaps and detergents and dental prostheses.
household bleach
chromium sulphate used as a tanning agent for leather
23. Clinical features
Dry insidious eruption, which tends to fissure, particularly on the hands
Secondary lichenification is often a feature.
Widespread eruptions may occur from cement dust, with flexural accentuation and
involvement of the ankles and dorsa of the feet.
Palmar vesicular eruptions have been blamed on traces of chromate in the diet
Exposure to leather furniture has induced eczematous flares on the back,calves, arms and
feet in sensitized subjects
An oral lichenoid eruption to a chrome/cobalt prosthesis
Contact with leather footwear, gloves, belts and other clothing, or even handbags and
purses, may produce dermatitis in those areas in contact with the material
24. Avoidance
• Avoidance of contact with
sources of
chromate,including leather
footwear and gloves
• Ferrous sulphate added to
cement,thus preventing
chromium sensitization
• Various reducing agents,
chelating compounds and
ion exchangers have been
recommended as
components of hand creams
to prevent dermatitis in
chromate‐sensitive individuals
Prognosis
• In men, allergy to chromate
carries a worse prognosis
than does sensitization to
other allergens
• Chronicity and frequent
relapses are the rule
• affected individuals have
been labelled as ‘chrome
cripples’
• superimposed shoe
dermatitis may prevent by
using chromate free shoes
Patch test
• Sensitivity is demonstrated
by a closed patch test with
potassium dichromate 0.5%
in petrolatum.
25. 4. Palladium
Points of discussion
Chemistry
incidence and Prevalence
occurrence
clinical features
Patch test
26. Chemistry
•Palladium is a
relatively
inexpensive metal of
the platinum group
of elements
Prevalence
•cross‐reactivity or
contamination of
palladium chloride
by nickel sulphate
•There is
concomitant
sensitivity to nickel,
and guinea pig
Occurrence
• used in dental
alloys, prostheses
and industry .
• It can be used as a
whitener in white
gold.
• Its main uses are in
electrical
components and as
a catalyst
27. Clinical features
Its a reflection of nickel allergy.
Stomatitis and lichen planus due to palladium in dental materials ( i.e prostheses or dental
alloys )
A granulomatous reaction after ear piercing.
PATCH TESTING : Palladium chloride is normally tested at 1% in petrolatum.
28. 5. Gold
Points of discussion
Chemistry
incidence and Prevalence
occurrence
clinical features
Patch test
29. chemistry
•Metallic gold is
soft, malleable
and ductile
•It is stable and
resistant to
corrosion
•Gold salts, such as
gold trichloride
and potassium
dicyanoaurate are
sensitizing as well
as irritating
prevalence
• Female
predominance
• due to context of
jewellery or gold
dental work.
• increase
incidence due to
use of gold‐plated
cardiac stents
occurrence
• Jewellery
•stents and dental
materials.
• Gold salts are
used in the
plating,
electronics,
photographic,
glass and
porcelain
industries
30. Clinical features
A seborrhoeic eczema pattern has been described.
Persistent papules and nodules on the ear lobes with lymphomatoid or granulomatous
histology.
oral manifestations of allergy have included erythema, burning mouth, erosions,ulceration,
oro‐facial granulomatosis and lichen planus‐like lesions.
Acral dermatitis
Sodium aurothiomalate injections for rheumatoid arthritis have induced systemic contact
dermatitis and ‘fever’ in those previously sensitized to gold.
31. PATCH TESTING :
Gold sodium thiosulphate 0.5% in petrolatum.
Late reactions are common and an additional 7‐day
or even 2‐ or 3‐week reading has been advised.
The appearance of a positive patch test may be ‘dermal’, with erythema and
edema but no vesiculation.
32. 6. Mercury
Points of discussion
Chemistry
Occurrence
Clinical features
Patch test
33. chemistry
•Corrosive sublimate (HgCl2),
calomel (HgCl), fulminate
(Hg(CNO)2)
• ammoniated mercury
(HgCl·2NH 4Cl) and organic
compounds (e.g.
mercurochrome, thimerosal
and phenylmercuric) may all
sensitize
occurrence
•used in instruments and amalgam filling
teeth
•used in disinfectants, fungicides,
herbicides,
•insecticides, detonators, emulsion paints
and jewellery
•in the production of caustic soda and
chlorine
•Ammoniated mercury has been used in
the topical treatment of psoriasis.
•Mercury and ammoniated mercury have
been used in skin‐lightening creams
•Red mercuric sulphide is used in red
tattoos
34. Clinical features
local mucosal reactions and stomatitis
Hypertrophic amalgam dermatitis simulating carcinoma of the tongue
Perioral dermatitis after dental filling
oral lichen planus in association with amalgam fillings
Oro‐facial granulomatosisi n association with mercury allergy
Generalized exanthems and erythema multiforme from mercury exposure, including inhalati
on, dental fillings, following the breakage of thermometers in the mouth
use of an antiparasitic powder for the treatment of crab lice
systemic reactions from amalgam seem to develop a few hours after insertion or removal
and settle after 10–14 days
Red mercuric sulphide (cinnabar) in a tattoo may induce granulomatous reactions in
allergic subjects.
35. PATCH TESTING :
Mercury is normally tested at 0.5% in petrolatum,
mercurochrome 2% in petrolatum or aqueous, mercuric chloride
0.1% in petrolatum and ammoniated mercury 2% in petrolatum.
Patch testing to amalgam is also possible and is
available commercially at 5% pet. and as amalgam alloying metals
at 20% pet.
37. occurrence
•Aluminium is widely used
in (kitchen utensils,window
frames,foils etc ) but
contact allergy is very rare.
• Aluminium Adsorbed
vaccines and parenteral
solutions
•Antiperspirant
Clinical features
• granulomatous
reactions at the injection
site in case of
vaccination and
parenteral solution for
hyposensitization
• Axillary dermatitis due
to the use of
antiperspirant
38. PATCH TESTING :
Pure aluminium metal or salts, for example aluminium acetate 10% aqueous or
aluminium chloride 2% aqueous, can be used for testing.
a positive patch test,often annular in configuration.
39. 8. copper
Copper is a ubiquitous metal found especially in coinage, jewellery,pipes, electrical equipment
and wiring.
Its salts are used in insecticides, fungicides, wood preservatives, food processing,
Fertilizers and fur dyes.
Contact allergy is very rare.
Dermatitis has been reported from copper intrauterine contraceptive devices.
Other metals used in dentistry may have the potential to cause contact allergy, including
platinum, rhodium, indium and iridium.
40. Fragrances, balsams, flavouring agents and spices
General description
Prevalence
Occurrence
Clinical features
Avoidance
Patch test
41. How perfumes cause allergic reaction ?
Natural
sources
synthetic
fixatives
Natural sources include extracts from plants, tree
lichens and animals (e.g. musk, civet)
mixture of essential oils from the natural sources
‘Fixatives’ are added to delay evaporation.e.g balsams,
benzyl benzoate, benzyl salicylate and synthetic musks
42. What is balsam?
An aromatic and usually oily and resinous substance
flowing from various plants
e.g: balsam of Peru,balsam of Tolu, balsam of spruce, gum
benzoin and storax.
Tree balsams contain many different fragrance and
flavouring Components
Balsam of Peru comes from a tree, Myroxylon pereirae,
that grows in Central America (not Peru!)
widely used earlier for treating wounds, and scabies
composition: balsam does contain benzyl benzoate,
benzyl cinnamate, cinnamic acid, alcohol and aldehyde,
benzoic acid, vanillin, farnesol and nerolidol
It may cross‐sensitize with resorcinol monobenzoate
used in cellulose ester plastics
43. Flavours:
• Flavours may similarly be of natural or synthetic origin. Examples of natural flavours include
citrus fruit peel, peppermint oil,spearmint and vanilla
Natural spices
• Natural spices include nutmeg, mustard,
• cinnamon, cloves and oil of juniper. In the modern food industry
Prevalence
fragrances are the second most common allergen (after nickel)
Routine patch testing with balsam of Peru as a marker of allergy to perfume and certain flavours has shown
a positive rate of allergy
44. Occurrence
Fragrances are ubiquitous. Perfumes, cosmetics,
moisturizers, deodorants, aftershaves, soaps, bath additives, aromatherapy, oils and toilet
tissues and wipes are typical sources.
Medicaments and work creams and cleansers often contain perfume
domestic environment cleansers, fabric conditioners, candles, pot pourri, air fresheners and
polishes.
coolant oils may contain a masking perfume.
Flavours and spices are found in foods, beverages, lipsalves and dental products, including
toothpastes.
45. Clinical features
In women: hands, face and neck.
In men: hands, face and lower legs.
Allergic reaction to axillae in both sexes.
Allergy to lavender applied to a pillow.
Aromatherapists and their clients are liable to
sensitization in sites where there is contact with the
essential oils.
Allergic occupational hand dermatitis in d‐limonene
in its oxidized state
Dermatitis in bakers and chefs as a result of contact
with sensitizing flavouring agents
An urticated contact dermatitis in a patient
allergic to fragrance
46. Cont’d
Peeling of citrus fruit may induce allergic hand dermatitis.
Cheilitis may be a reflection of allergy to flavouring agents in toothpastes ,lip salves and
food and drink
Gingivitis has occurred from allergy to eugenol in dental cement
Cinnamon has induced oral blisters, erosions and lichen planus.
Balsam of Peru is still used as a medicament, particularly in haemorrhoid preparations, and
allergy is therefore relevant to perianal problems
Sensitizing balsams are used in medicaments and balms for wounds, sprains and joint pains.
Tincture of benzoin is used in a similar way, and may also be used under orthopaedic plaster
casts.
Vesicular hand dermatitis has been related to dietary intake of flavours related to balsam of
Peru
Musk ambrette is a synthetic perfume component responsible for photoallergy.
Fragrance‐allergic subjects appear to be at an increased risk of more frequent and more
severe eye and respiratory symptoms.
47. Avoidance :
In the domestic situation,perfume‐containing sprays such as air fresheners,
insect repellents and hairsprays should be avoided.
Fragrance allergic patients with ongoing problems should also be counselled
Other perfumed skin products to be avoided include deodorants,aftershave,
talcum powders, soaps.
PATCH TESTING :
The main recommended marker for perfume allergy was balsam of
Peru, which is still advised.