Esthetic post systems/ dentistry site


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Esthetic post systems/ dentistry site

  1. 1. Esthetic postEsthetic post systemssystems INDIAN DENTAL ACADEMY Leader in continuing dental education
  2. 2. contentscontents  IntroductionIntroduction  Effects of endodontic treatment on teethEffects of endodontic treatment on teeth  Considerations for anteriro and posteriorConsiderations for anteriro and posterior teethteeth  Requirements of postsRequirements of posts  Key features of post and core designKey features of post and core design  Factors affecting selection of postsFactors affecting selection of posts
  3. 3.  Factors affecting retention of postsFactors affecting retention of posts  Classification of esthetic post systemsClassification of esthetic post systems  Properties of fiber post systemsProperties of fiber post systems  Clinical techniquesClinical techniques  CementationCementation  SummarySummary  ConclusionConclusion  referencesreferences
  4. 4. IntroductionIntroduction
  5. 5. Effect of endodonticEffect of endodontic treatment on teethtreatment on teeth  Tooth structure after endodonticTooth structure after endodontic treatment weakened by previoustreatment weakened by previous episodes ofepisodes of  FractureFracture  Tooth preparationTooth preparation  RestorationRestoration  Endodontic manipulationEndodontic manipulation
  6. 6.  Loss of tooth structureLoss of tooth structure  Altered physical characteristicsAltered physical characteristics  Altered esthetic characteristicsAltered esthetic characteristics
  7. 7. considerationsconsiderations  Anterior teethAnterior teeth  Intact , non-vital , has not lost toothIntact , non-vital , has not lost tooth structurebeyond access cavity preperationstructurebeyond access cavity preperation Less risk of fractureLess risk of fracture Sealing the access cavitySealing the access cavity
  8. 8. considerationsconsiderations  Anterior teethAnterior teeth  Intact , non-vital , has lost significantIntact , non-vital , has lost significant tooth structuretooth structure More risk of fractureMore risk of fracture crown retained by dowel and corecrown retained by dowel and core
  9. 9.  Posterior teethPosterior teeth  Depends on remaining tooth structureDepends on remaining tooth structure  If adeqaute tooth structure present , coreIf adeqaute tooth structure present , core and crown is sufficientand crown is sufficient  If inadeqaute, post and core with crownIf inadeqaute, post and core with crown necessarynecessary
  10. 10.
  11. 11. Requirements of postRequirements of post and coreand core  Physical properties similar to dentine  Maximum  Retention with little removal of dentin  Distribution of functional stresses evenly along the root surface,  Esthetic compatibility with the definitive restoration and surrounding tissue,  Minimal stress during placement and cementation,
  12. 12.  Resistance to displacement,  Good core retention,  Easy retrievability,  Material compatibility with core,  Ease of use, safety and reliability,  Reasonable cost.
  13. 13. Key features for aKey features for a succesful post and coresuccesful post and core designdesign
  14. 14. Factors determiningFactors determining selection of postsselection of posts  Root lengthRoot length  Greater the post length, the better the retention and stress distribution  Reserve 3 to 5mm of apical gutta-percha to maintain the apical seal
  15. 15.  Tooth anatomyTooth anatomy  A consideration of the root size and length is important, because improper post space preparation and use of large-diameter posts present the risk of apical or lateral perforation.  An active post can initiate cracks in the thin dentinal wall
  16. 16.  Post widthPost width  Preserving tooth structure, reducing the chances of perforation, and permitting the restored tooth to resist fractures are criteria in selection of the post width
  17. 17. Lloyd PM, Palik JF. The philosophies of dowel diameter preparation: a literature review. J Prosthet Dent 1993;69:32-6.  Selection of post width sumarised bySelection of post width sumarised by Lloyd and palik into 3 categoriesLloyd and palik into 3 categories  Conservationist  Preservationist  Proportionist
  18. 18.  Canal configuration and post adaptabilityCanal configuration and post adaptability  Canal configuration aids in making a choice between a custom-designed post and a prefabricated post  If post confirms to the shape of the canal closly  more conservative procedure  more resistance to fracture
  19. 19.  Coronal structureCoronal structure  The bulk of the tooth above the restorative margin should be at least 1.5 to 2 mm to achieve resistance form.  Teeth restored with carbon fiber posts had inferior strength compared with those restored with metal posts when subjected to forces simulating those in a clinical setting  (Sidoli GE, King PA, Setchell DJ. An in vitro evaluation of a carbon fiber based post and core system. J Prosthet Dent 1997;78:5-9.)
  20. 20.  Carbon fiber post system, can be used when ample coronal dentin remains and the crown is well supported by remaining tooth structure; otherwise, cast post and core may be used when there is moderate to severe tooth loss.
  21. 21.  SStresstress  Post and core–restored endodontically treated teeth are subjected to various types of stresses:  compression,  tensile, and shear  An increase in the post length with diameter kept to a minimum will help to reduce shear stresses and preserve tooth structure
  22. 22.  Torsional forcesTorsional forces  Intraorally, post and core–restored teeth are subjected to various types of forces. Torsional forces on the post-core-crown unit may lead to loosening and displacement of the post from the canal, causing failure of the system
  23. 23.  Role of hydrostatic pressureRole of hydrostatic pressure  Cementation plays a significant role in enhancing retention, stress distribution, and sealing irregularities between the tooth and the post
  24. 24.  Post designPost design  Classified according to shape design and surfaceClassified according to shape design and surface characteristics.characteristics.  According to shape designAccording to shape design  Parallel sidedParallel sided  TaperedTapered  Parallel tapered combinationParallel tapered combination According to surface characteristicsAccording to surface characteristics Active and passiveActive and passive
  25. 25.  Post materialPost material  Metal post systemsMetal post systems  Carbon fiber postsCarbon fiber posts  Zirconia postsZirconia posts
  26. 26. (Mannocci E, Ferrari M, Watson TF. Intermittent loading of teeth restored using quartz fiber, carbon-quartz fiber and zirconium dioxide ceramic root canal posts. J Adhes Dent 1999;1:153-8.)  Bonding abilityBonding ability  Resin luting agents showed good adhesion to carbon  Fiber posts and glass fiber posts.69 The adhesion to zirconia posts was found to be unsatisfactory.69 It was also observed that to improve retention, the carbon fiber post did not require any surface treatment as compared with the zirconia post.
  27. 27.  Core materialCore material  RetrievebilityRetrievebility  EstheticsEsthetics
  28. 28. Factors affecting theFactors affecting the retention of postsretention of posts  Post lengthPost length  The post should equal the incisocervical or occlusocervical dimension of the crown.  The post should be as long as possible without disturbing the apical seal  Short posts are especially dangerous and have a much higher failure rate
  29. 29.  Post diameterPost diameter  Increasing the diameter of the post does not provide a significant increase in the retention of the post; however, it can increase the stiffness of the post at the expense of the remaining dentin and the fracture resistance of the root.  post diameter must be controlled to preserve radicular dentin, reduce the potential for perforations, and permit the tooth to resist fracture
  30. 30.  Luting cementsLuting cements  Resistance formResistance form  Stress distributionStress distribution  Rotational resistanceRotational resistance
  31. 31. Ferrule effectFerrule effect
  32. 32. Classification ofClassification of esthetic postsesthetic posts  Polyethylene fiber postsPolyethylene fiber posts  RibondRibond  Glass fiber postsGlass fiber posts  Fibrekor posts (Generic Pentron)Fibrekor posts (Generic Pentron)  Carbon fiber postsCarbon fiber posts  ComposipostComposipost  C – Post systemsC – Post systems
  33. 33.  Quartz fibers bound in an epoxy matrixQuartz fibers bound in an epoxy matrix  D T Light post (Bisco Usa)D T Light post (Bisco Usa)  Astheti Plus postsAstheti Plus posts  Light postsLight posts  Ceramic postsCeramic posts  Direct methodDirect method  Cerapost (Lemgo, Germany)Cerapost (Lemgo, Germany)
  34. 34.  Indirect methodIndirect method  Split casting technique (Inceram posts)Split casting technique (Inceram posts)  Copy milling technique (In ceram Celay posts)Copy milling technique (In ceram Celay posts)  Two Piece technique (ER – Post systems,Two Piece technique (ER – Post systems, Brassler Germany)Brassler Germany)  Heat preassure techniqueHeat preassure technique  Cosmopost (Ivoclar)Cosmopost (Ivoclar)
  35. 35. Thank you For more details please visit