Impressions procedures/ implant dentistry course

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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.

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Impressions procedures/ implant dentistry course

  1. 1. ImpressionsImpressions ProceduresProcedures inin Esthetic DentistryEsthetic Dentistry INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.comwww.indiandentalacademy.com
  2. 2. ContentsContents  IntroductionIntroduction  Fluid controlFluid control  Custom trayCustom tray  Impression proceduresImpression procedures  Sterilization of impressionsSterilization of impressions  ConclusionConclusion www.indiandentalacademy.comwww.indiandentalacademy.com
  3. 3. IntroductionIntroduction  IMPRESSION:IMPRESSION: (GPT 8) Impression is a(GPT 8) Impression is a negative likeness or copy in reverse of thenegative likeness or copy in reverse of the subject of an object, imprint of the teeth andsubject of an object, imprint of the teeth and adjacent structures for use in dentistry.adjacent structures for use in dentistry.  REQUIREMENTS OF AN IMPRESSION:REQUIREMENTS OF AN IMPRESSION: a. Should be an exact duplication of the prepareda. Should be an exact duplication of the prepared toothtooth b. Other teeth & tissue adjacent to the preparedb. Other teeth & tissue adjacent to the prepared tooth must be accurately reproducedtooth must be accurately reproduced www.indiandentalacademy.comwww.indiandentalacademy.com
  4. 4. c. Must be free of bubbles, in the area of the finishc. Must be free of bubbles, in the area of the finish line and occlusal surfacesline and occlusal surfaces d. Tissue health.d. Tissue health. e. Saliva control.e. Saliva control. f. Gingival tissue displacement.f. Gingival tissue displacement. g. Dimensionally stable.g. Dimensionally stable. h. Biocompatible.h. Biocompatible. i. The materials associated with processing,i. The materials associated with processing, equipment and processing time cost effective.equipment and processing time cost effective. www.indiandentalacademy.comwww.indiandentalacademy.com
  5. 5. Fluid controlFluid control  Moisture will result in voids therefore salivaMoisture will result in voids therefore saliva flow into the area must be reduced.flow into the area must be reduced.  Techniques used to create the necessary dryTechniques used to create the necessary dry field of operation:field of operation: a)a) Rubber damRubber dam b)b) High volume vacuumHigh volume vacuum c)c) Saliva ejector & cotton rollsSaliva ejector & cotton rolls d)d) Swedopter/ specjectorSwedopter/ specjector e)e) Moisture absorbing cardsMoisture absorbing cards f)f) AntisialagoguesAntisialagogues www.indiandentalacademy.comwww.indiandentalacademy.com
  6. 6. GINGIVAL TISSUEGINGIVAL TISSUE RETRACTIONRETRACTION  Methods:Methods: 1.1. Mechanical: Oversized copper bands,Mechanical: Oversized copper bands, rubber dam, plain cotton cords.rubber dam, plain cotton cords. 2.2. Mechanical chemical: Cord impregnatedMechanical chemical: Cord impregnated with chemicals for hemostasiswith chemicals for hemostasis 3.3. SurgicalSurgical www.indiandentalacademy.comwww.indiandentalacademy.com
  7. 7. Custom trayCustom tray Improves accuracy of an impression material Limiting volume of the material Reduces stresses during removal Reduces thermal contraction www.indiandentalacademy.comwww.indiandentalacademy.com
  8. 8.  Materials:Materials: I.I. Self cure acrylic resinsSelf cure acrylic resins II.II. Heat cure acrylic resinsHeat cure acrylic resins III.III. Light activated resinsLight activated resins IV.IV. Thermoplastic resinsThermoplastic resins V.V. Polyvinyl siloxane putty materialPolyvinyl siloxane putty material www.indiandentalacademy.comwww.indiandentalacademy.com
  9. 9. FabricationFabrication  Tray extensionTray extension - 3 to 5 mm from gingival margin- 3 to 5 mm from gingival margin - 3 mm beyond the most distal tooth- 3 mm beyond the most distal tooth - Outline drawn on diagnostic cast- Outline drawn on diagnostic cast  Softened modelling wax is adapted over teeth toSoftened modelling wax is adapted over teeth to form spacer (two thickness or 2-3mm)form spacer (two thickness or 2-3mm)  Spacer is trimmed till the outline drawnSpacer is trimmed till the outline drawn  Wax is removed to form tray stops (on nonWax is removed to form tray stops (on non centric cusps)centric cusps)  Self cure acrylic is adapted over the spacer &Self cure acrylic is adapted over the spacer & tray is fabricatedtray is fabricated www.indiandentalacademy.comwww.indiandentalacademy.com
  10. 10. Impression techniques Multiple mix technique Single mix technique Auto mix technique Machine mix technique www.indiandentalacademy.comwww.indiandentalacademy.com
  11. 11. Multiple mix techniqueMultiple mix technique  Steps:Steps: 1. Verify tray fit and apply tray adhesive (for at1. Verify tray fit and apply tray adhesive (for at least 7-15 minutes).least 7-15 minutes). 2. Select medium/ high viscosity elastomer to line2. Select medium/ high viscosity elastomer to line the tray and low viscosity material to syringethe tray and low viscosity material to syringe the preparation.the preparation. 3. Mix the low viscosity material to obtain a streak3. Mix the low viscosity material to obtain a streak free mix in less than 1 min and load thefree mix in less than 1 min and load the syringe with it.syringe with it. 4. Mix the high viscosity elastomer and load into4. Mix the high viscosity elastomer and load into the tray without overfilling it.the tray without overfilling it.www.indiandentalacademy.comwww.indiandentalacademy.com
  12. 12. 5. Remove the retraction cord and evaluate5. Remove the retraction cord and evaluate tissue for seepage, hemorrhage and for debris.tissue for seepage, hemorrhage and for debris. 6. Syringe the material into the prepared areas6. Syringe the material into the prepared areas (into most distal first)(into most distal first) 7. Position the tray over the arch and seat from7. Position the tray over the arch and seat from posterior to anterior. Continue seating in aposterior to anterior. Continue seating in a vertical direction until the tray stops preventvertical direction until the tray stops prevent further progress.further progress. 8. Remove the tray on setting of the material.8. Remove the tray on setting of the material. 9. Evaluate the final impression after its removal9. Evaluate the final impression after its removal and disinfect.and disinfect. www.indiandentalacademy.comwww.indiandentalacademy.com
  13. 13. www.indiandentalacademy.comwww.indiandentalacademy.com
  14. 14. Putty-wash technique  reduces effect of polymerization shrinkage  stock tray  putty placed  thin plastic sheet spacer  preliminary impression  Intra oral custom tray  inject wash material www.indiandentalacademy.comwww.indiandentalacademy.com
  15. 15. Single mix techniqueSingle mix technique www.indiandentalacademy.comwww.indiandentalacademy.com
  16. 16. Automix techniqueAutomix technique  Gun like mechanismGun like mechanism  Uniformity inUniformity in proportioning andproportioning and mixingmixing  Less air incorporatedLess air incorporated  Mixing time reducedMixing time reduced  Less chance ofLess chance of contaminationcontamination www.indiandentalacademy.comwww.indiandentalacademy.com
  17. 17. Machine mixing techniqueMachine mixing technique  An alternative method for improving impressionAn alternative method for improving impression mixing is to use a machine mixingmixing is to use a machine mixing www.indiandentalacademy.comwww.indiandentalacademy.com
  18. 18. Handling PropertiesHandling Properties PolysulfidePolysulfide CondensationCondensation SiliconeSilicone AdditionAddition SiliconeSilicone PolyetherPolyether PreparationPreparation 2 pastes2 pastes 2 pastes or2 pastes or paste/liquidpaste/liquid 2 pastes2 pastes 2 pastes2 pastes Ease ofEase of UseUse FairFair FairFair ExcellentExcellent GoodGood PatientPatient ReactionReaction Unpleasant,Unpleasant, stainsstains Pleasant, cleanPleasant, clean PleasantPleasant UnpleasantUnpleasant cleanclean Ease ofEase of removalremoval EasyEasy ModerateModerate ModerateModerate Moderate toModerate to difficultdifficult DisinfectionDisinfection FairFair FairFair ExcellentExcellent FairFair www.indiandentalacademy.comwww.indiandentalacademy.com
  19. 19. Handling PropertiesHandling Properties PolysulfidePolysulfide CondensationCondensation SiliconeSilicone AdditionAddition SiliconeSilicone PolyetherPolyether WorkingWorking Time (min)Time (min) 5 – 75 – 7 33 2 –4.52 –4.5 2.52.5 SettingSetting TimeTime (min)(min) 8 – 128 – 12 6 – 86 – 8 3 – 73 – 7 4.54.5 StabilityStability 1 hour1 hour Immediate pourImmediate pour 1 week1 week 1 week kept1 week kept drydry WettabilityWettability andand castabilitycastability FairFair FairFair Fair to goodFair to good GoodGood CostCost LowLow ModerateModerate High to very highHigh to very high Very highVery high www.indiandentalacademy.comwww.indiandentalacademy.com
  20. 20. DISINFECTION OFDISINFECTION OF IMPRESSIONSIMPRESSIONS::  Alginate impression material:Alginate impression material:  5.25 % NaOCl immersion for 10 minutes.5.25 % NaOCl immersion for 10 minutes.  Glutaraldehyde (time inadequate)Glutaraldehyde (time inadequate)  (Spray and place in sealed plastic bag for 10(Spray and place in sealed plastic bag for 10 minutes)minutes)  Agar impression materialAgar impression material: -: -  2 % Alkaline gluteraldehyde for 10 minutes2 % Alkaline gluteraldehyde for 10 minutes www.indiandentalacademy.comwww.indiandentalacademy.com
  21. 21.  Polysulfides impression material: -Polysulfides impression material: -  Immersion in gluteraldehyde, NaOCl, iodophorImmersion in gluteraldehyde, NaOCl, iodophor phenol up to 30 minutes.phenol up to 30 minutes.  Condensation silicone materialCondensation silicone material:-:-  NaOCl, gluteraldehyde, phenol are used.NaOCl, gluteraldehyde, phenol are used.  Poly vinyl siloxane material :-Poly vinyl siloxane material :-  Excellent tolerance to immersion in NaOCl,Excellent tolerance to immersion in NaOCl, gluteraldehyde, iodophors and phenols.gluteraldehyde, iodophors and phenols.  Polyether impression material:-Polyether impression material:-  Shorter immersion time of 10-30 minutes isShorter immersion time of 10-30 minutes is required in NaOCl, gluteraldehyde, Iodophor andrequired in NaOCl, gluteraldehyde, Iodophor and phenolphenol www.indiandentalacademy.comwww.indiandentalacademy.com
  22. 22. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.comwww.indiandentalacademy.com

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