Elastomeric impression

Elastomeric Impression material

1. GOOD MORNING

2. Elastomeric Impression Material SUMAYA S A 1 st year MDS Department of prosthodontics

3. Classification 03 Introduction 01 History 02 Materials & Methods 05 CONTENTS 04 Properties Advancements 06 07 Effects of mishandlig

4. Introduction E lastomeric impression material (GPT 9) a group of flexible chemical polymers that are either chemically or physically cross-linked; generally, they can be easily stretched and rapidly recover their original dimensions when applied stresses are released . 4

5. Quote 5 1988 1990-2000 1970 1950 1960 1857 1820 1756 latest addition and light cure elastomers Additional silicone New auto devices and delivery systems Phillip Pffaf : Softened wax impression Charles stent: Impression Compound Polyether Christophe Francois: Metal impression trays Polys ulphides & condensational silicones

6. Ideal requirements

7. Clinical application 7

8. Classification 8 Impression materials Rigid Impression plaster Zinc Oxide Eugenol Impression compound Impression waxes Elastic Hydrocolloid Reversible hydrocolloid Irreversible hydrocolloid Elastomers Polyether Polysulfides Silicones

9. Classification Polysulphide Silicon rubbers _-condensation curing type Silicon rubbers _-addition curing type polyether According to chemistry According to chemistry According to chemistry L ight body / syringe consistency Medium / Regular body Heavy body / Tray consistency Very Heavy / Putty consistency ADA Classification 9 Results Analysis According to Viscosity Type I Type II Type III

10. POLYSULFIDES First synthetic elastomeric impression material Also known as MERCAPTAN or THIOKOL -Mode of supply Collapsible tubes One labeled Base paste and Other labeled Accelerator paste -Consistencies  Light body(syringe or wash)  Medium body (regular)  Heavy body 1950 10 First synthetic elastomeric impression material Also known as MERCAPTAN or THIOKOL MODE OF SUPPLY Collapsible tubes One labeled Base paste and Other labeled Accelerator paste CONSISTENCIES Light body(syringe or wash ) Medium body (regular) Heavy body

11. Multifunctional mercaptan (-SH) - 80 to 85% Fillers - 16 to 18% Titanium dioxide, lithopone, zinc sulfate , copper carbonate or silica Dibutyl phthalate Sulfur -( 0.5 %) 11 Lead dioxide -60 to 68% Oleic/stearic acid Deodorants BASE PASTE REACTOR PASTE

12. 12 Polysulfide Lead dioxide prepolymer water

13. 13 Advantages Disadvantages

14. Condensation Silicones First synthetic elastomeric impression material Also known as MERCAPTAN or THIOKOL -Mode of supply Collapsible tubes One labeled Base paste and Other labeled Accelerator paste -Consistencies  Light body(syringe or wash)  Medium body (regular)  Heavy body 1950 14 Also known as conventional silicones The setting occurs in room temperature so called as RTV silicones (room temperature vulcanization ) MODE OF SUPPLY Collapsible tubes Base paste and Accelerator paste / liquid Putty is supplied in jars CONSISTENCIES Light body (syringe or wash) Putty

15. Polydimethyl siloxane ( hydroxy terminated) Fillers; 16 to 18% Calcium carbonate or silica 15 Tetra-ethyl Orthosilicate - reactor Stannous octoate - catalyst BASE PASTE REACTOR PASTE

16. 16 Dimethyl siloxane Tetra-ethyl orthosilicate Silicone rubber Ethyl alcohol Stannous octate

17. 17 Advantages Disadvantages

18. Addition Silicones First synthetic elastomeric impression material Also known as MERCAPTAN or THIOKOL -Mode of supply Collapsible tubes One labeled Base paste and Other labeled Accelerator paste -Consistencies  Light body(syringe or wash)  Medium body (regular)  Heavy body 1950 18 MODE OF SUPPLY Collapsible tubes Base paste and Accelerator paste Putty is supplied in jars CONSISTENCIES Light body (syringe or wash) Medium body (regular) Heavy body Putty Also known as polyvinyl siloxane or vinyl polysiloxane

19. Poly methyl hydrogen siloxane Other siloxane prepolymers Fillers- Divinyl poly siloxane 19 Platinum salt: Catalyst ( chloroplatinic acid) Palladium: Scavenger BASE PASTE REACTOR PASTE

20. 20 Polymethyl hydrosiloxane Divinylpoly siloxane Silicone rubber Chloroplatinic acid

21. 21 Advantages Disadvantages

22. POLYETHER First synthetic elastomeric impression material Also known as MERCAPTAN or THIOKOL -Mode of supply Collapsible tubes One labeled Base paste and Other labeled Accelerator paste -Consistencies  Light body(syringe or wash)  Medium body (regular)  Heavy body 1950 22 First elastomer to be developed primarily to function as an impression material MODE OF SUPPLY Collapsible tubes Base paste Accelerator paste Third tube containing thinner may be supplied CONSISTENCIES Light bodied(syringe or wash) Medium bodied (regular) Heavy bodied

23. •Imine-terminated Prepolymer •Inert filler- silica • Plasticizer phthalate 23 •Ester derivative of aromatic sulphonic acid •Inert filler – silica • Plasticizer phthalate BASE PASTE (LARGE TUBE) CATALYST PASTE (SMALL TUBE)

24. 24 Sulfonic ester polyether Cross linked rubber

25. 25 Advantages Disadvantages

26. Credits PROPERTIES 26

27. 27

28. METHODS 28

29. 1 . Preparing a tray 2. Managing tissue 3. Preparing the material 4. Making an impression 5. Removing the impression 6. Preparing stone casts and dies 29

30. Preparing the material 30 Dynamic mechanical mixing Static mixing Hand mixing  

31. Multiple mix technique Single viscosity technique Putty wash technique Making an impression 31

32. MULTIPLE MIX TECHNIQUE 32

33. SINGLE VISCOSITY TECHNIQUE 33

34. PUTTY WASH TECHNIQUE 34

35. All elastomeric impression materials are viscoelastic, and it is necessary to use a quick snap to minimize plastic deformation. Debubblizers , a dilute solution of soap - wettability of the silicone impression material for the stone slurry  Excellent dimensional stability of addition silicone and polyether impression - construct two or three casts or dies REMOVING THE IMPRESSION 35 PREPARING STONE CASTS AND DIES

36. Advancements in elastomer 36

37. 37 In early 1988, a visible light cured impression was introduced(Genesis L.D. caulk). COMPOSITION :- Polyether urethane dimethacrylate C amphoroquinone Diethyl amino ethyl methacrylate Silicone dioxide PROPERTIES :- Long working time and short setting time Blue light is used for curing with transparent impression trays Tear strength-6000-7500 gm /cm 2 (Highest among elastomers). Other properties are similar to additional silicone MANIPULATION :- Light body is syringed into the sulcus and over the preparation Heavy body is loaded onto a clear tray and seated over the light body Both are simultaneously cured with a visible light curing unit for approximately 3 m ins VISIBLE LIGHT CURED POLYETHER URETHANE DIMETHACRYLATE

38. Hydrophilized vinyl polysiloxane Surfactants are added to reduce the contact angle; dilute solution of soap • Most commonly used – non-ionic surfactants . 38

39. Effects of mishandling 39

40.  Too rapid polymerisation preventing flow  Air incorporation during mixing  Premature removal  Improper mixing ratio  Too rapid polymerisation  Excessive high accelerator / base ratio – condensation silicon Rough / uneven surface 40 Bubbles

41. Lack of adhesion of rubber to the tray caused by not applying enough coats of adhesives. filling tray with material too soon after applying adhesive or using wrong adhesives Development of elastic properties in the material before tray is seated Excessive bulk of material Insufficient relief for the reline material Continued pressure against impression material that has been developed elastic properties Movement of tray during polymerization Premature removal from the mouth Delay pouring of the polysulfide or condensation silicone impression. DISTORTION

42. Inadequate cleaning  Excess water left on surface  Excess wetting agent  Premature removal  Improper manipulation of stone  Failure to delay pour of additional silicone  Moisture / debris Irregularly shaped voids 42 Rough / chalky stone cast

43. CONCLUSION 43

44. Philips science of dental materials 12th edition  Craig’s restorative dental materials 13th edition  Mc Cabe and walls’ applied dental materials 9th edition Conclusions 44 2 References

45. THANK YOU 45

46. Conclusion 46