Resins Dental

Resins Dental

1. Generalities

   • Material used in the dental office
   • They contain inorganic filler particles immersed in an organic polymer matrix.
   • advantage
     • aesthetics
     • tooth preservation
   • disadvantages
     • contraction

2. History

   • First half of the 20th century material silicates are introduced
   • In 1935, polymethyl methacrylate was introduced for the resin of dental prostheses.
   • In 1949, the benzoyl peroxide-tertiary amine redox initiator-accelerator system was developed for the PMMA resin curing system.
   • In 1951, epoxy resin was introduced as a direct filling material as a mineral filler, which had a color similar to that of teeth
   • In 1965 Bowen discovered bisphenol-A Glycidyl Methacrylate (Bis-GMA)
   • In 1969, the commercial Adaptic composite composed of Bis-GMA and a silenced quartz filler was introduced to the market as restorative materials.

3. Adhesive systems

   • Universal adhesive
     • These are used with the etch and rinse technique or the self-etching technique
   • Self-etch adhesive
     • They are able to demineralize the smear layer and dentin underlying while allowing resin monomers to penetrate the demineralized zone, creating a hybrid layer
   • Etch and rinse adhesive
     • require tissue conditioning with 37% orthophosphoric acid
     • This process removes the smear layer

4. Curing System

   • photopolymerization
     • El iniciador característico es el sistema canforquinona (CQ) / amina
   • chemical curing
     • Its initiator is benzoyl peroxide
     • Its accelerator or co-initiator is a tertiary amine

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