Maxilloprosth material/ dental education in india

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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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Maxilloprosth material/ dental education in india

  1. 1. METHACRYLOXYPROPYL TERMINATEDPOLYDIMETHYL SILOXANE INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. INTRODUCTION • The most widely used silicone elastomers for maxillofacial prosthesis are ,MDX4- 4210,A -2186 AND DOW ORNING MEDICAL ADHESIVE TYPE A www.indiandentalacademy.com
  3. 3. • The components in A-2186 and MD4- 4210 are available as two contents and both materials cure by same mechanism. www.indiandentalacademy.com
  4. 4. • Although these materials have improved tear strength, both A-2186 and MDX4 – 4210 have low adhesiveness due to their hydrophobic nature and the curing reaction starts immediately after mixing of the two components , which decrees the working time. www.indiandentalacademy.com
  5. 5. • Medical adhesive type A is hydroxyl terminated polydimethyl silioxane and it requires moisture to cure, therefore material inside a mold require long time to cure. www.indiandentalacademy.com
  6. 6. • Methacryloxy propyl –terminated polymethylsiloxane is silicone elastomer with a unique chemical structure. The cross linkable polysiloxane provides the silicone with electrometric characteristics. www.indiandentalacademy.com
  7. 7. • The dimethacrylate groups located on the chain ends readily undergo free radical thermal polymerization and cross linking. • Incorporation of methacrylate group in the silicone reduces the hydrophobicity of the silicone that enhances the adhesive bond strength to non – silicone – based adhesives. www.indiandentalacademy.com
  8. 8. • Because MPDS cures thermally , its working time for prosthesis fabrication is long. www.indiandentalacademy.com
  9. 9. Manipulation • MPDS based maxillofacial materials were prepared by dispersing the thermal initiator into the MPDS first, fallowed by through mixing of the mixture with the fillers and additives. Later the material is introduced in to the stone or stainless steel mold to cure thermally. www.indiandentalacademy.com
  10. 10. • Physical and mechanical properties of MPDS – MF depends upon the degree of cross linking and the type and concentration of fillers in the elastomer net work. Physical & Mechanical Properties www.indiandentalacademy.com
  11. 11. cure method Hardness (khn) Elongation (%) Tensilestength (mpa) Tear strength/cm) Non-pigmented (mpds) Ss mold oven cured 34.0 358 4.61 162.80 Stone mold oven cured 30.7 404 4.84 181.03 Stone mold water bath cured 28.7 471 4.76 184.15 Mechanical properties of MPDS www.indiandentalacademy.com
  12. 12. cure method Hardness Elongation(%) Tensile strength (mpa) Tear strength/cm) Pigmented (mpds) Ss mold oven cure 31.1 358 3.91 160.57 Stone mould oven cure 31.5 383 4.48 187.26 Stone mold water bath cure 27.8 455 4.31 202.82 www.indiandentalacademy.com
  13. 13. Discussion • The mechanical properties of MPDS materials cured In convection oven using stainless steel mold were compared those of the MPDS material cured in stone • The non pigmented materials cured in a stainless steel mold are harder than those cured in stone mold. www.indiandentalacademy.com
  14. 14. • The water bath cured specimen are softer and more stretchable when compared with the cured materials in stainless steel mold or stone mold . • Pigments have effect on the material cured in the stainless steel molds, but not those cured in the stone molds. www.indiandentalacademy.com
  15. 15. • The hardness of MPDS material is same when compared with A-2186, how ever , the tensile strength ,tear strength and adhesive bonding strength of MPDS is higher than A-2186. www.indiandentalacademy.com
  16. 16. conclusion • The improved properties of MPDS-MF are related to its chemical structure and the polydimethysiloxane polymer MPDS provides the silicone elastomer characteristics www.indiandentalacademy.com
  17. 17. • The dimethacrylate groups locate other chain ends readily undergo free radical thermal polymerization and cross linking . • Presence of methacrylate groups in the polymer network enhances the tear strength, tensile strength, bonding strength to the adhesives and dispensability with the pigments. www.indiandentalacademy.com
  18. 18. • The results obtained from the studies suggest that MPDS –MF is suitable for use as maxillofacial prosthetic materail. www.indiandentalacademy.com
  19. 19. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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