SlideShare a Scribd company logo
1 of 17
 The word Alginate comes from alginic acid i.e. anhydro
beta d-mannuronic acid. Like agar, it is a natural
Hydrophillic Colloidal Polysaccheride extracted from
brown seaweed.
 The present alginate hydrocolloid was developed as a
substitute for agar when it becomes uncommon due to
World War II.
 Currently alginate is more
popular than agar for dental
impression, because it is
simple to use.
Alginate is supplied as:-
 bulk packing
 Preweighed packets for
individual impression
A plastic scoop is supplied
for taking the bulk powder.
A plastic cylinder is also
supplied for measuring the
water.
In general 16g
of powder ( 2
scoops ) is
mixed with 38
ml of water.
COMPOSITION OF ALGINATE HYDROCOLLOID
Ingredients % by wt. Functions
Soluble alginates
ex.- Sodium or Potassium
or Triethanolamine
alginate
15% Dissolve in water and form a viscous sol
being soluble in nature
Calcium sulphate
( Reactor )
16% Reacts with soluble alginates and form
insoluble calcium alginate
Zinc Oxide 4% Act as a filler particle
Potassium Titanium
Fluoride
3% Act as accelerator for the setting of a
stone to be poured in impression to
ensure hard, dense surface of a cast.
Diatomaceous Earth 60% Also act as a filler , provide strength and
stiffness
Sodium Phosphate
( Retarder )
2% Reacts with calcium sulphate there by
retard the setting of impression
Coloring and flavouring
agent
traces For the comfort of patient
SETTING REACTION / GELATION PROCESS
 When a alginate powder is mixed with water, a sol is
formed which later sets to gel by a chemical reaction.
 Insoluble calcium alginate is produced when soluble
sodium alginate reacts with calcium sulphate.
 However, this reaction is too fast, there is not enough
working time, so a reaction is delayed by addition of a
retarder i.e. sodium phosphate.
 Calcium sulphate prefers to react with retarder first.
 It reacts with sodium or potassium alginates only when
the supply of retarder is over.
 This will delays the reaction and increase the working
time for us.
Retarder Reactor
ReactorSoluble Alginate Insoluble Alginate
CLASSIFICATION
 Type I – Fast Setting
 Type II – Normal Setting
MIXING TIME
 For fast set alginate = 45 sec.
 For normal set alginate = 60 sec.
 Over mixing results in –
- Reduction in final strength
- Reduction in working time
 Under mixing results in –
- inadequate wetting, lack of homogeneity
- poor recording of detail
WORKING TIME
 For fast set alginate – 1 min. 25 sec.
 For normal set alginate – 2 min.
GELATION TIME
 For fast setting alginate – 1.5 to 2.0 min.
 For normal setting alginate – 3 to 4.5 min.
 Ideal gelation time is 3-4 min.
 The dentist can control the setting time by altering the
temperature of water for mixing alginate material.
- colder the water longer is the gelation time
- warmer the water shorter is the gelation time
 Control of setting time by changing w/p ratio is not
recommended in case of alginate.
PROPERTIES OF ALGINATE HYDROCOLLOID
 Taste and Odour –
Alginate has a pleasant taste and smell for the comfort of a patient.
Flavors include strawberry, orange, mint, vanilla.
 Strength –
Alginate has a poor tear strength.
Factors affecting strength are:-
- w/p ratio too much or too little water reduces gel strength
- Mixing time over and under mixing both will reduces strength
- Time of removal of impression strength increases if the time of
removal is delayed for few minutes after setting
 Syneresis and Imbibition –
Like agar, it also exhibit the properties of synresis and imbibition.
 Dimensional stability –
Set alginates have poor dimensional stability due to evaporation,
syneresis and imbibition. Therefore like in case of Agar, cast should be
poured immediately.
 Adhesion –
Alginate does not adhere well to the tray. Good adhesion is important
for accuracy of impression. So, retention to the tray is achieved by
mechanical locking features in the tray or by applying an adhesive.
1. It is easy to mix and manipulate.
2. Minimum requirement of
equipments.
3. Low cost.
4. Comfortable to patient
5. Accuracy is there if properly
handled.
6. Gives a good surface detail even
in presence of saliva.
1. It cannot be corrected.
2. Poor dimensional stability – it
cannot be store for a long time.
3. Poor tear strength.
4. It is not recommended where a
high degree of accuracy is
required, e.g., RPDs and FPDs
etc.
ADVANTAGES DISADVANTAGES
USES OF ALGINATE HYDROCOLLOID
 It is used for impression making
- when there are undercuts
- in mouth with excessive flow of saliva
- for partial dentures with clasp
 For making a preliminary impression for complete
dentures.
 For duplicating models.
LAMINATE TECHNIQUE
 It is the combined agar-alginate technique.
 In this technique
- Tray material chilled alginate
- syringe material hot agar
 Advantages –
1. water cool tray is not required more convenient
2. syringe agar records the tissue more accurately
3. it sets faster than regular agar technique
 Disadvantages –
1. Agar alginate bond failure.
METHOD OF LAMINATE TECHNIQUE
 After injecting a syringe agar on the area to be recorded, an
impression tray containing a mix of chilled alginate is positioned over
it that will bond with the agar.
 The alginate get solidify by means of chemical reaction whereas agar
solidify through contact with cool alginate rather than the water
circulating through the tray.
 Since the agar, not the alginate is in contact with prepared teeth,
maximum detail is reproduced.
 Because only the syringe material needs to be heated, equipment
cost is lowered and less preparation time is required.
MODIFIED ALGINATES
 Traditional alginate material is used as a two
component system of powder and water in which
no reaction occur until powder is added to water to
initiate the reaction.
 But now we can purchase alginate in a sol form,
containing the water but has no source of calcium
ions. MODIFIED ALGINATE
 Then a reactor of plaster of paris can then be
added to a sol
Alginate Dental Material

More Related Content

What's hot

Steps Of Cavity Preparation
Steps Of Cavity PreparationSteps Of Cavity Preparation
Steps Of Cavity PreparationAbhinav Mudaliar
 
DENTIN BONDING AGENTS
 DENTIN BONDING AGENTS DENTIN BONDING AGENTS
DENTIN BONDING AGENTSshibil_v90
 
Alginate-Irreversible Hydrocolloid
Alginate-Irreversible HydrocolloidAlginate-Irreversible Hydrocolloid
Alginate-Irreversible HydrocolloidAmeet Agrawal
 
principles of cavity preparation
principles of cavity preparationprinciples of cavity preparation
principles of cavity preparationIAU Dent
 
ZINC PHOSPHATE CEMENT
ZINC  PHOSPHATE  CEMENTZINC  PHOSPHATE  CEMENT
ZINC PHOSPHATE CEMENTRohan Vadsola
 
Special tray prosthodontics
Special tray prosthodonticsSpecial tray prosthodontics
Special tray prosthodonticsShazlana Raheem
 
Impression materials classification and techniques
Impression materials classification and techniquesImpression materials classification and techniques
Impression materials classification and techniquesmoix rafiq
 
steps of cavity preparation for class 1
steps of cavity preparation for class 1 steps of cavity preparation for class 1
steps of cavity preparation for class 1 Parikshit Harnoor
 
Fundamentals in tooth preparation (conservative dentistry)
Fundamentals in tooth preparation (conservative dentistry)Fundamentals in tooth preparation (conservative dentistry)
Fundamentals in tooth preparation (conservative dentistry)Adwiti Vidushi
 

What's hot (20)

Steps Of Cavity Preparation
Steps Of Cavity PreparationSteps Of Cavity Preparation
Steps Of Cavity Preparation
 
Composite
CompositeComposite
Composite
 
DENTIN BONDING AGENTS
 DENTIN BONDING AGENTS DENTIN BONDING AGENTS
DENTIN BONDING AGENTS
 
Dental Casting alloy
Dental Casting alloyDental Casting alloy
Dental Casting alloy
 
dentin bonding agents
dentin bonding agentsdentin bonding agents
dentin bonding agents
 
Denture base materials
Denture base materials Denture base materials
Denture base materials
 
Dental Amalgam
Dental AmalgamDental Amalgam
Dental Amalgam
 
Wedging technique
Wedging techniqueWedging technique
Wedging technique
 
Spacer designs
Spacer designsSpacer designs
Spacer designs
 
Dental waxes final ppt
Dental waxes final pptDental waxes final ppt
Dental waxes final ppt
 
GIC
GICGIC
GIC
 
Alginate-Irreversible Hydrocolloid
Alginate-Irreversible HydrocolloidAlginate-Irreversible Hydrocolloid
Alginate-Irreversible Hydrocolloid
 
principles of cavity preparation
principles of cavity preparationprinciples of cavity preparation
principles of cavity preparation
 
Dental Cements
Dental CementsDental Cements
Dental Cements
 
ZINC PHOSPHATE CEMENT
ZINC  PHOSPHATE  CEMENTZINC  PHOSPHATE  CEMENT
ZINC PHOSPHATE CEMENT
 
Special tray prosthodontics
Special tray prosthodonticsSpecial tray prosthodontics
Special tray prosthodontics
 
Dental burs
Dental bursDental burs
Dental burs
 
Impression materials classification and techniques
Impression materials classification and techniquesImpression materials classification and techniques
Impression materials classification and techniques
 
steps of cavity preparation for class 1
steps of cavity preparation for class 1 steps of cavity preparation for class 1
steps of cavity preparation for class 1
 
Fundamentals in tooth preparation (conservative dentistry)
Fundamentals in tooth preparation (conservative dentistry)Fundamentals in tooth preparation (conservative dentistry)
Fundamentals in tooth preparation (conservative dentistry)
 

Similar to Alginate Dental Material

Elastomeric impression material-ALGINATE
Elastomeric impression material-ALGINATEElastomeric impression material-ALGINATE
Elastomeric impression material-ALGINATESafura GM
 
Irreversible hydrocolloids
Irreversible hydrocolloidsIrreversible hydrocolloids
Irreversible hydrocolloidsPriyam Javed
 
Elastic Impression material - Alginate
Elastic Impression material - AlginateElastic Impression material - Alginate
Elastic Impression material - AlginateArthiRamalingam1
 
ALGINATE IMPRESSION MATERIAL-Dr MEENU MERRY C PAUL
ALGINATE IMPRESSION MATERIAL-Dr MEENU MERRY C PAULALGINATE IMPRESSION MATERIAL-Dr MEENU MERRY C PAUL
ALGINATE IMPRESSION MATERIAL-Dr MEENU MERRY C PAULMeenuMerryCPaul
 
Elastic imp material
Elastic imp materialElastic imp material
Elastic imp materialsmidsprostho
 
impressionmaterials-130530063028-phpapp01.pdf
impressionmaterials-130530063028-phpapp01.pdfimpressionmaterials-130530063028-phpapp01.pdf
impressionmaterials-130530063028-phpapp01.pdfMohammedAyman75
 
Impression Materials Part - 3 - Dental Materials
Impression Materials Part - 3 - Dental MaterialsImpression Materials Part - 3 - Dental Materials
Impression Materials Part - 3 - Dental MaterialsDr.shiva sai vemula
 
Impression materials used in orthodontics
Impression materials used in orthodonticsImpression materials used in orthodontics
Impression materials used in orthodonticsIshan297
 
Impression materials in orthodontics
Impression materials in orthodonticsImpression materials in orthodontics
Impression materials in orthodonticsdromarmohdortho
 
Impression materials
Impression materials Impression materials
Impression materials Nidhi Pandya
 

Similar to Alginate Dental Material (20)

HYDROCOLLOIDS
HYDROCOLLOIDSHYDROCOLLOIDS
HYDROCOLLOIDS
 
Elastomeric impression material-ALGINATE
Elastomeric impression material-ALGINATEElastomeric impression material-ALGINATE
Elastomeric impression material-ALGINATE
 
Irreversible hydrocolloids
Irreversible hydrocolloidsIrreversible hydrocolloids
Irreversible hydrocolloids
 
-ALGINATE.pptx
-ALGINATE.pptx-ALGINATE.pptx
-ALGINATE.pptx
 
ALGINATE.pptx
ALGINATE.pptxALGINATE.pptx
ALGINATE.pptx
 
Elastic Impression material - Alginate
Elastic Impression material - AlginateElastic Impression material - Alginate
Elastic Impression material - Alginate
 
Impression materials agar and alginate
Impression materials agar and alginateImpression materials agar and alginate
Impression materials agar and alginate
 
Agar alginate
Agar alginateAgar alginate
Agar alginate
 
Hydrocolloid impression materials
Hydrocolloid impression materialsHydrocolloid impression materials
Hydrocolloid impression materials
 
ALGINATE IMPRESSION MATERIAL-Dr MEENU MERRY C PAUL
ALGINATE IMPRESSION MATERIAL-Dr MEENU MERRY C PAULALGINATE IMPRESSION MATERIAL-Dr MEENU MERRY C PAUL
ALGINATE IMPRESSION MATERIAL-Dr MEENU MERRY C PAUL
 
Production of agarose
Production of agaroseProduction of agarose
Production of agarose
 
Agar
AgarAgar
Agar
 
Hydrocolloid
Hydrocolloid  Hydrocolloid
Hydrocolloid
 
Elastic imp material
Elastic imp materialElastic imp material
Elastic imp material
 
impressionmaterials-130530063028-phpapp01.pdf
impressionmaterials-130530063028-phpapp01.pdfimpressionmaterials-130530063028-phpapp01.pdf
impressionmaterials-130530063028-phpapp01.pdf
 
Impression materials
Impression materialsImpression materials
Impression materials
 
Impression Materials Part - 3 - Dental Materials
Impression Materials Part - 3 - Dental MaterialsImpression Materials Part - 3 - Dental Materials
Impression Materials Part - 3 - Dental Materials
 
Impression materials used in orthodontics
Impression materials used in orthodonticsImpression materials used in orthodontics
Impression materials used in orthodontics
 
Impression materials in orthodontics
Impression materials in orthodonticsImpression materials in orthodontics
Impression materials in orthodontics
 
Impression materials
Impression materials Impression materials
Impression materials
 

Recently uploaded

Kolkata Call Girls Services 9907093804 @24x7 High Class Babes Here Call Now
Kolkata Call Girls Services 9907093804 @24x7 High Class Babes Here Call NowKolkata Call Girls Services 9907093804 @24x7 High Class Babes Here Call Now
Kolkata Call Girls Services 9907093804 @24x7 High Class Babes Here Call NowNehru place Escorts
 
Russian Call Girls Chickpet - 7001305949 Booking and charges genuine rate for...
Russian Call Girls Chickpet - 7001305949 Booking and charges genuine rate for...Russian Call Girls Chickpet - 7001305949 Booking and charges genuine rate for...
Russian Call Girls Chickpet - 7001305949 Booking and charges genuine rate for...narwatsonia7
 
Call Girls Service In Shyam Nagar Whatsapp 8445551418 Independent Escort Service
Call Girls Service In Shyam Nagar Whatsapp 8445551418 Independent Escort ServiceCall Girls Service In Shyam Nagar Whatsapp 8445551418 Independent Escort Service
Call Girls Service In Shyam Nagar Whatsapp 8445551418 Independent Escort Serviceparulsinha
 
call girls in green park DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️
call girls in green park  DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️call girls in green park  DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️
call girls in green park DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️saminamagar
 
call girls in Connaught Place DELHI 🔝 >༒9540349809 🔝 genuine Escort Service ...
call girls in Connaught Place  DELHI 🔝 >༒9540349809 🔝 genuine Escort Service ...call girls in Connaught Place  DELHI 🔝 >༒9540349809 🔝 genuine Escort Service ...
call girls in Connaught Place DELHI 🔝 >༒9540349809 🔝 genuine Escort Service ...saminamagar
 
Call Girls Kanakapura Road Just Call 7001305949 Top Class Call Girl Service A...
Call Girls Kanakapura Road Just Call 7001305949 Top Class Call Girl Service A...Call Girls Kanakapura Road Just Call 7001305949 Top Class Call Girl Service A...
Call Girls Kanakapura Road Just Call 7001305949 Top Class Call Girl Service A...narwatsonia7
 
Call Girl Bangalore Nandini 7001305949 Independent Escort Service Bangalore
Call Girl Bangalore Nandini 7001305949 Independent Escort Service BangaloreCall Girl Bangalore Nandini 7001305949 Independent Escort Service Bangalore
Call Girl Bangalore Nandini 7001305949 Independent Escort Service Bangalorenarwatsonia7
 
Call Girl Service Bidadi - For 7001305949 Cheap & Best with original Photos
Call Girl Service Bidadi - For 7001305949 Cheap & Best with original PhotosCall Girl Service Bidadi - For 7001305949 Cheap & Best with original Photos
Call Girl Service Bidadi - For 7001305949 Cheap & Best with original Photosnarwatsonia7
 
Call Girls Service Nandiambakkam | 7001305949 At Low Cost Cash Payment Booking
Call Girls Service Nandiambakkam | 7001305949 At Low Cost Cash Payment BookingCall Girls Service Nandiambakkam | 7001305949 At Low Cost Cash Payment Booking
Call Girls Service Nandiambakkam | 7001305949 At Low Cost Cash Payment BookingNehru place Escorts
 
call girls in munirka DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️
call girls in munirka  DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️call girls in munirka  DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️
call girls in munirka DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️saminamagar
 
Hemostasis Physiology and Clinical correlations by Dr Faiza.pdf
Hemostasis Physiology and Clinical correlations by Dr Faiza.pdfHemostasis Physiology and Clinical correlations by Dr Faiza.pdf
Hemostasis Physiology and Clinical correlations by Dr Faiza.pdfMedicoseAcademics
 
Call Girl Koramangala | 7001305949 At Low Cost Cash Payment Booking
Call Girl Koramangala | 7001305949 At Low Cost Cash Payment BookingCall Girl Koramangala | 7001305949 At Low Cost Cash Payment Booking
Call Girl Koramangala | 7001305949 At Low Cost Cash Payment Bookingnarwatsonia7
 
Mumbai Call Girls Service 9910780858 Real Russian Girls Looking Models
Mumbai Call Girls Service 9910780858 Real Russian Girls Looking ModelsMumbai Call Girls Service 9910780858 Real Russian Girls Looking Models
Mumbai Call Girls Service 9910780858 Real Russian Girls Looking Modelssonalikaur4
 
See the 2,456 pharmacies on the National E-Pharmacy Platform
See the 2,456 pharmacies on the National E-Pharmacy PlatformSee the 2,456 pharmacies on the National E-Pharmacy Platform
See the 2,456 pharmacies on the National E-Pharmacy PlatformKweku Zurek
 
Russian Call Girl Brookfield - 7001305949 Escorts Service 50% Off with Cash O...
Russian Call Girl Brookfield - 7001305949 Escorts Service 50% Off with Cash O...Russian Call Girl Brookfield - 7001305949 Escorts Service 50% Off with Cash O...
Russian Call Girl Brookfield - 7001305949 Escorts Service 50% Off with Cash O...narwatsonia7
 
College Call Girls Pune Mira 9907093804 Short 1500 Night 6000 Best call girls...
College Call Girls Pune Mira 9907093804 Short 1500 Night 6000 Best call girls...College Call Girls Pune Mira 9907093804 Short 1500 Night 6000 Best call girls...
College Call Girls Pune Mira 9907093804 Short 1500 Night 6000 Best call girls...Miss joya
 
Call Girls In Andheri East Call 9920874524 Book Hot And Sexy Girls
Call Girls In Andheri East Call 9920874524 Book Hot And Sexy GirlsCall Girls In Andheri East Call 9920874524 Book Hot And Sexy Girls
Call Girls In Andheri East Call 9920874524 Book Hot And Sexy Girlsnehamumbai
 
Call Girls Jp Nagar Just Call 7001305949 Top Class Call Girl Service Available
Call Girls Jp Nagar Just Call 7001305949 Top Class Call Girl Service AvailableCall Girls Jp Nagar Just Call 7001305949 Top Class Call Girl Service Available
Call Girls Jp Nagar Just Call 7001305949 Top Class Call Girl Service Availablenarwatsonia7
 
Low Rate Call Girls Pune Esha 9907093804 Short 1500 Night 6000 Best call girl...
Low Rate Call Girls Pune Esha 9907093804 Short 1500 Night 6000 Best call girl...Low Rate Call Girls Pune Esha 9907093804 Short 1500 Night 6000 Best call girl...
Low Rate Call Girls Pune Esha 9907093804 Short 1500 Night 6000 Best call girl...Miss joya
 
Call Girls Electronic City Just Call 7001305949 Top Class Call Girl Service A...
Call Girls Electronic City Just Call 7001305949 Top Class Call Girl Service A...Call Girls Electronic City Just Call 7001305949 Top Class Call Girl Service A...
Call Girls Electronic City Just Call 7001305949 Top Class Call Girl Service A...narwatsonia7
 

Recently uploaded (20)

Kolkata Call Girls Services 9907093804 @24x7 High Class Babes Here Call Now
Kolkata Call Girls Services 9907093804 @24x7 High Class Babes Here Call NowKolkata Call Girls Services 9907093804 @24x7 High Class Babes Here Call Now
Kolkata Call Girls Services 9907093804 @24x7 High Class Babes Here Call Now
 
Russian Call Girls Chickpet - 7001305949 Booking and charges genuine rate for...
Russian Call Girls Chickpet - 7001305949 Booking and charges genuine rate for...Russian Call Girls Chickpet - 7001305949 Booking and charges genuine rate for...
Russian Call Girls Chickpet - 7001305949 Booking and charges genuine rate for...
 
Call Girls Service In Shyam Nagar Whatsapp 8445551418 Independent Escort Service
Call Girls Service In Shyam Nagar Whatsapp 8445551418 Independent Escort ServiceCall Girls Service In Shyam Nagar Whatsapp 8445551418 Independent Escort Service
Call Girls Service In Shyam Nagar Whatsapp 8445551418 Independent Escort Service
 
call girls in green park DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️
call girls in green park  DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️call girls in green park  DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️
call girls in green park DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️
 
call girls in Connaught Place DELHI 🔝 >༒9540349809 🔝 genuine Escort Service ...
call girls in Connaught Place  DELHI 🔝 >༒9540349809 🔝 genuine Escort Service ...call girls in Connaught Place  DELHI 🔝 >༒9540349809 🔝 genuine Escort Service ...
call girls in Connaught Place DELHI 🔝 >༒9540349809 🔝 genuine Escort Service ...
 
Call Girls Kanakapura Road Just Call 7001305949 Top Class Call Girl Service A...
Call Girls Kanakapura Road Just Call 7001305949 Top Class Call Girl Service A...Call Girls Kanakapura Road Just Call 7001305949 Top Class Call Girl Service A...
Call Girls Kanakapura Road Just Call 7001305949 Top Class Call Girl Service A...
 
Call Girl Bangalore Nandini 7001305949 Independent Escort Service Bangalore
Call Girl Bangalore Nandini 7001305949 Independent Escort Service BangaloreCall Girl Bangalore Nandini 7001305949 Independent Escort Service Bangalore
Call Girl Bangalore Nandini 7001305949 Independent Escort Service Bangalore
 
Call Girl Service Bidadi - For 7001305949 Cheap & Best with original Photos
Call Girl Service Bidadi - For 7001305949 Cheap & Best with original PhotosCall Girl Service Bidadi - For 7001305949 Cheap & Best with original Photos
Call Girl Service Bidadi - For 7001305949 Cheap & Best with original Photos
 
Call Girls Service Nandiambakkam | 7001305949 At Low Cost Cash Payment Booking
Call Girls Service Nandiambakkam | 7001305949 At Low Cost Cash Payment BookingCall Girls Service Nandiambakkam | 7001305949 At Low Cost Cash Payment Booking
Call Girls Service Nandiambakkam | 7001305949 At Low Cost Cash Payment Booking
 
call girls in munirka DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️
call girls in munirka  DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️call girls in munirka  DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️
call girls in munirka DELHI 🔝 >༒9540349809 🔝 genuine Escort Service 🔝✔️✔️
 
Hemostasis Physiology and Clinical correlations by Dr Faiza.pdf
Hemostasis Physiology and Clinical correlations by Dr Faiza.pdfHemostasis Physiology and Clinical correlations by Dr Faiza.pdf
Hemostasis Physiology and Clinical correlations by Dr Faiza.pdf
 
Call Girl Koramangala | 7001305949 At Low Cost Cash Payment Booking
Call Girl Koramangala | 7001305949 At Low Cost Cash Payment BookingCall Girl Koramangala | 7001305949 At Low Cost Cash Payment Booking
Call Girl Koramangala | 7001305949 At Low Cost Cash Payment Booking
 
Mumbai Call Girls Service 9910780858 Real Russian Girls Looking Models
Mumbai Call Girls Service 9910780858 Real Russian Girls Looking ModelsMumbai Call Girls Service 9910780858 Real Russian Girls Looking Models
Mumbai Call Girls Service 9910780858 Real Russian Girls Looking Models
 
See the 2,456 pharmacies on the National E-Pharmacy Platform
See the 2,456 pharmacies on the National E-Pharmacy PlatformSee the 2,456 pharmacies on the National E-Pharmacy Platform
See the 2,456 pharmacies on the National E-Pharmacy Platform
 
Russian Call Girl Brookfield - 7001305949 Escorts Service 50% Off with Cash O...
Russian Call Girl Brookfield - 7001305949 Escorts Service 50% Off with Cash O...Russian Call Girl Brookfield - 7001305949 Escorts Service 50% Off with Cash O...
Russian Call Girl Brookfield - 7001305949 Escorts Service 50% Off with Cash O...
 
College Call Girls Pune Mira 9907093804 Short 1500 Night 6000 Best call girls...
College Call Girls Pune Mira 9907093804 Short 1500 Night 6000 Best call girls...College Call Girls Pune Mira 9907093804 Short 1500 Night 6000 Best call girls...
College Call Girls Pune Mira 9907093804 Short 1500 Night 6000 Best call girls...
 
Call Girls In Andheri East Call 9920874524 Book Hot And Sexy Girls
Call Girls In Andheri East Call 9920874524 Book Hot And Sexy GirlsCall Girls In Andheri East Call 9920874524 Book Hot And Sexy Girls
Call Girls In Andheri East Call 9920874524 Book Hot And Sexy Girls
 
Call Girls Jp Nagar Just Call 7001305949 Top Class Call Girl Service Available
Call Girls Jp Nagar Just Call 7001305949 Top Class Call Girl Service AvailableCall Girls Jp Nagar Just Call 7001305949 Top Class Call Girl Service Available
Call Girls Jp Nagar Just Call 7001305949 Top Class Call Girl Service Available
 
Low Rate Call Girls Pune Esha 9907093804 Short 1500 Night 6000 Best call girl...
Low Rate Call Girls Pune Esha 9907093804 Short 1500 Night 6000 Best call girl...Low Rate Call Girls Pune Esha 9907093804 Short 1500 Night 6000 Best call girl...
Low Rate Call Girls Pune Esha 9907093804 Short 1500 Night 6000 Best call girl...
 
Call Girls Electronic City Just Call 7001305949 Top Class Call Girl Service A...
Call Girls Electronic City Just Call 7001305949 Top Class Call Girl Service A...Call Girls Electronic City Just Call 7001305949 Top Class Call Girl Service A...
Call Girls Electronic City Just Call 7001305949 Top Class Call Girl Service A...
 

Alginate Dental Material

  • 1.
  • 2.  The word Alginate comes from alginic acid i.e. anhydro beta d-mannuronic acid. Like agar, it is a natural Hydrophillic Colloidal Polysaccheride extracted from brown seaweed.  The present alginate hydrocolloid was developed as a substitute for agar when it becomes uncommon due to World War II.  Currently alginate is more popular than agar for dental impression, because it is simple to use.
  • 3. Alginate is supplied as:-  bulk packing  Preweighed packets for individual impression A plastic scoop is supplied for taking the bulk powder. A plastic cylinder is also supplied for measuring the water. In general 16g of powder ( 2 scoops ) is mixed with 38 ml of water.
  • 4. COMPOSITION OF ALGINATE HYDROCOLLOID Ingredients % by wt. Functions Soluble alginates ex.- Sodium or Potassium or Triethanolamine alginate 15% Dissolve in water and form a viscous sol being soluble in nature Calcium sulphate ( Reactor ) 16% Reacts with soluble alginates and form insoluble calcium alginate Zinc Oxide 4% Act as a filler particle Potassium Titanium Fluoride 3% Act as accelerator for the setting of a stone to be poured in impression to ensure hard, dense surface of a cast. Diatomaceous Earth 60% Also act as a filler , provide strength and stiffness Sodium Phosphate ( Retarder ) 2% Reacts with calcium sulphate there by retard the setting of impression Coloring and flavouring agent traces For the comfort of patient
  • 5. SETTING REACTION / GELATION PROCESS  When a alginate powder is mixed with water, a sol is formed which later sets to gel by a chemical reaction.  Insoluble calcium alginate is produced when soluble sodium alginate reacts with calcium sulphate.  However, this reaction is too fast, there is not enough working time, so a reaction is delayed by addition of a retarder i.e. sodium phosphate.
  • 6.  Calcium sulphate prefers to react with retarder first.  It reacts with sodium or potassium alginates only when the supply of retarder is over.  This will delays the reaction and increase the working time for us. Retarder Reactor ReactorSoluble Alginate Insoluble Alginate
  • 7. CLASSIFICATION  Type I – Fast Setting  Type II – Normal Setting MIXING TIME  For fast set alginate = 45 sec.  For normal set alginate = 60 sec.  Over mixing results in – - Reduction in final strength - Reduction in working time  Under mixing results in – - inadequate wetting, lack of homogeneity - poor recording of detail
  • 8. WORKING TIME  For fast set alginate – 1 min. 25 sec.  For normal set alginate – 2 min. GELATION TIME  For fast setting alginate – 1.5 to 2.0 min.  For normal setting alginate – 3 to 4.5 min.  Ideal gelation time is 3-4 min.  The dentist can control the setting time by altering the temperature of water for mixing alginate material. - colder the water longer is the gelation time - warmer the water shorter is the gelation time  Control of setting time by changing w/p ratio is not recommended in case of alginate.
  • 9. PROPERTIES OF ALGINATE HYDROCOLLOID  Taste and Odour – Alginate has a pleasant taste and smell for the comfort of a patient. Flavors include strawberry, orange, mint, vanilla.  Strength – Alginate has a poor tear strength. Factors affecting strength are:- - w/p ratio too much or too little water reduces gel strength - Mixing time over and under mixing both will reduces strength - Time of removal of impression strength increases if the time of removal is delayed for few minutes after setting  Syneresis and Imbibition – Like agar, it also exhibit the properties of synresis and imbibition.
  • 10.  Dimensional stability – Set alginates have poor dimensional stability due to evaporation, syneresis and imbibition. Therefore like in case of Agar, cast should be poured immediately.  Adhesion – Alginate does not adhere well to the tray. Good adhesion is important for accuracy of impression. So, retention to the tray is achieved by mechanical locking features in the tray or by applying an adhesive.
  • 11. 1. It is easy to mix and manipulate. 2. Minimum requirement of equipments. 3. Low cost. 4. Comfortable to patient 5. Accuracy is there if properly handled. 6. Gives a good surface detail even in presence of saliva. 1. It cannot be corrected. 2. Poor dimensional stability – it cannot be store for a long time. 3. Poor tear strength. 4. It is not recommended where a high degree of accuracy is required, e.g., RPDs and FPDs etc. ADVANTAGES DISADVANTAGES
  • 12. USES OF ALGINATE HYDROCOLLOID  It is used for impression making - when there are undercuts - in mouth with excessive flow of saliva - for partial dentures with clasp  For making a preliminary impression for complete dentures.  For duplicating models.
  • 13.
  • 14. LAMINATE TECHNIQUE  It is the combined agar-alginate technique.  In this technique - Tray material chilled alginate - syringe material hot agar  Advantages – 1. water cool tray is not required more convenient 2. syringe agar records the tissue more accurately 3. it sets faster than regular agar technique  Disadvantages – 1. Agar alginate bond failure.
  • 15. METHOD OF LAMINATE TECHNIQUE  After injecting a syringe agar on the area to be recorded, an impression tray containing a mix of chilled alginate is positioned over it that will bond with the agar.  The alginate get solidify by means of chemical reaction whereas agar solidify through contact with cool alginate rather than the water circulating through the tray.  Since the agar, not the alginate is in contact with prepared teeth, maximum detail is reproduced.  Because only the syringe material needs to be heated, equipment cost is lowered and less preparation time is required.
  • 16. MODIFIED ALGINATES  Traditional alginate material is used as a two component system of powder and water in which no reaction occur until powder is added to water to initiate the reaction.  But now we can purchase alginate in a sol form, containing the water but has no source of calcium ions. MODIFIED ALGINATE  Then a reactor of plaster of paris can then be added to a sol