Dental post


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Dental post

  1. 1. Institute of Biomedical Sciences. DENTAL POST Dr. Ángel Salinas Ramírez Dr. Alfredo Nevárez Rascón
  2. 2. DENTAL POST.Dental postsThe posts also called dental bolts areused to make larger the toothand can support thecrown. Function of the dental posts.Return the anatomy and functionto a tooth that was destroyed orweakened protect whatremains ofthe tooth for possible fractures,retention and distributionof occlusal forces. figure 1:post ulos_odont/4.html15/01/12
  3. 3. MATERIALSDepending on the material the poles canbasically be divided intotwo groups: metallic and no metallic. Figure 2: metal posts alogo/index.php?cPath=93_ 73 DENTAL METAL POSTS Within the metal, in turn, have the precast and cast.Figure: 3 prefabricated •The prefabricated are stainless steel orposts of titanium and titanium are faster, easier, cheaperstainless steel (right) and less abusive to the tooth.http://www.exim- •The castings can be made gold type III or IV. Have high tensile Figure 4: metal posts strength, compression and deformation (high modulus of elasticity) /perno-munon-colado/ (not screwed)15/01/12
  4. 4. NO METALLIC DENTAL POSTSNo metallic dental Posts: we havethe zirconium, resin reinforced with glassfiber reinforced resin and carbon fiber.•The zircon have extremely high modulus ofelasticity, the metal even higher.•The fiberglass and carbon, have a modulus of Figure 5: Non-metallic postelasticity similar to dentin, and thus are least to cause root fractures. Their advantage /index.php/revistaodontologica/aris they are cheaper, faster, easier, and ticle/view/85/171requires less wear layer. Figure 7: Table of porcentagesFigure 6: Non-metallic poles fiberglass of metal components. 1/MERCADO-DENTAL/uso-postes-fibra- 15/01/12 reconstrucciones.html
  5. 5. COMPONENTS OF NON-METALLIC DENTAL POST Fiberglass Unidirectional Resin (BIS- GMA,UDMA) Filing (barium, sulfate, borosilicate Figure 8: components of non-metallic dental post20/01/12
  6. 6. CHARACTERISTICS OF A DENTAL POST The size of a pole; should not exceed one third of the root diameter. Conversely, increasing the removal of the dental structure to accommodate a wide pole, can lead to perforation or predispose root fracture.The length of the post; must beequal to or greater than the length of thecrown. Is recommended between halfand 3/4 parts of the root. Since in thelong poles thin roots can causeperforations or fractures, while the short Figure 10: length of a pole.roots may violate the apical seal. http://www.bogotadentistry.com20/01/12 /art/imp1.gif
  7. 7. DIFERENTS FORMS OF POSTS.•Smooth•Striated•Parallel•Conical•Hybrid Figure 11: Schematic layout of•Assets bolts (A) conical. (B) parallel. (C) conical threading. (D) parallel threaded.•Liabilities•Rigid•flexible r/odontoinvitadoold/odontoinvitado_40.htm25/01/12
  8. 8. CEMENT TO POSTNon-adhesive cements zinc phosphatecement interdigitation Classic Withholdi Figure: 12 zinc phosphate cementng Adequatebut not, not chemical bonding does not mages/0840.jpginhibit marginal leakage,No anticariogenic properties.Adhesive cements glass ionomercement reinforcedwith moderate retention Highstrengthresin Solubility little orno fluoride release Fig: 13 inomero glass cement 3__20090416.jpg25/01/12
  9. 9. ADVANTAGES DISAVANTAGES Glass post: reducing the risk Some posts such as metal, are of root fractures. very rigid and stress transfer. The carbon fiber Some posts and castings are a post allows the post and the bit more expensive because stump in a single session. of its chemical components. The prefabricated posts are The metal poles are faster, easier, cheaper transparent showing an and less abusive to the tooth. opacity in central tooth and gum.Elaborated 26/02/12
  10. 10. TRADEMARKSOptident. Figure 14: poles kit.Tenax.D.T. ligth post.Cytec (Alemania) Parapost Fiber White dex.php/revistaodontologica/article/v(Suiza iew/85/171Angelus Reforpost (Brasil) Figure 15: Case of poles.26/01/12 Figure 16: poles of two thicknesse
  11. 11. BIBLIOGRAPHY•••••••