The document discusses resin unfilled resin composites, focusing on their major components, including organic resin matrix and polymer filler materials, which enhance strength and mechanical properties. It highlights key characteristics such as thermal conductivity, water sorption, and tensile strength, noting that composite restorations are less durable than metallic restorations but exhibit high compressive strength. Additionally, it compares silorane-based and methacrylate-based composites regarding volumetric shrinkage during polymerization.

1. Done by :
Ghadeer suwaimiL
Fatimah al-marhoon

3. Resin
Unfilled Resin
Composite
(filler resin )

5. Major
components
Organic resin
matrix
Polymer
filler
materials
- Increase the
strength and
mechanical properties
.
Coupling
agent
to improve adherence
of resin to filler
surfaces.
Activation
systems
including heat,
chemical and
photochemical initiate
polymerization.
Plasticizers
solvents that contain
catalysts for mixture
into resin

6.  Physical characteristics improve by combining
more than one type of monomer and are referred
to as a copolymer
Thermal conductivity: composite restoration has a
lower thermal conductivity than do metallic restorations
such as gold alloy or amalgam--silver-colored restorations.
Water sorption : less than the unfilled resin.
Water solubility : has lower solubility than unfilled
resin.

8. Tensile : Composites Require Strong Tooth Structure
To Support The Filling Because The Tensile And Shear
Strength Is Low
Durability:
Composite Restorations Are Not As Durable As Other Materials.
Composite Fillings Previously Were Not As Durable As Amalgams.
Compressive Stength : high
Modulus Of Elasticity : high

15. is the relation between the number of
surfaces bonded divided by the number
of surfaces unbonded.
As the configuration factor goes up, the
effects of polymerization stress and
strain become more significant in
maintaining marginal seal.

17. System Has Been Developed To
Minimize Polymerization Shrinkage And
Polymerization Stress, While Providing A
High performance Bond To The Tooth.

18. For example
Silorane Ormocer

19. -As Silorane-based Composite Polymerizes, “Ring
Opening” Monomers Connect By Opening,flattening
And Extending Towards Each Other.
The Result Is Significantly Less Volumetric Shrinkage
Compared To Methacrylate-based Composites.
-As Methacrylate-based Composites Cure, The
Molecules Of These “Linear Monomers” Connect By
Actually Shifting Closer Together In A Linear
Response. The Result Is A Loss Of Volume.
1 ) Silorane

20. SILORANE

21. METHACRYLATE

22. The Name Silorane Derives From Its Chemical
Building Blocks Siloxanes And Oxiranes.
The Combination Of The Two Chemical Building
Blocks Of Siloxanes And Oxiranes Provides The
Biocompatible,hydrophobic And Low-shrinking
Silorane Base Of Filtek LS Low Shrink Posterior
Restorative.

28. 2 ) Ormocer

29. 2 ) Ormocer

31. Any Questions?

32. http://www.biomedsearch.com/article/Dental-ceramics-ormocer-technology-navigating/165363951.html
http://www.sciencedirect.com/science/article/pii/S0300571208002303
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2842.2010.02066.x/abstract
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3442430/
http://www.sso.ch/doc/doc_download.cfm?uuid=BC57B04E903739FBB9D6BA480B2D2018
http://digitalcollections.lrc.usuhs.mil/cdm/compoundobject/collection/p15459coll1/id/104179/rec/4
http://www.oralhealthgroup.com/news/the-search-for-a-low-shrinkage-direct-composite/1000364318/
http://www.kssfp.jp/pdf/APJD11-1Tanno27-33.pdf
http://www.dentalaegis.com/id/2009/03/manufacturers-introduce-new-composite-formulations-being-advertised-
as-low-shrink-composites
http://multimedia.3m.com/mws/mediawebserver?6666660Zjcf6lVs6EVs66sz6jCOrrrrQ-
http://www.dypdentaljournals.com/2008/Dr.%20Prachi%20Joshi%20-%20conso.pdf
References