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Below is an essay on "Resin" from Anti Essays, your source for research papers, essays, and term paper examples.

Restorative Composite Resins

Overview


Direct restoratives
 composition  classification  performance

factors

Flowable  Packables


Composite
 

Material with two or more distinct substances
 metals,  soft


ceramics or polymers

Dental resin composite
organic-resin matrix inorganic-filler particles
polymer ceramic
 hard,




Most frequently used


esthetic-restorative material

History


1871 – silicates
 alumina-silica

glass & phosphoric acid  very soluble  poor mechanical properties
 polymethylmethacrylate  high



1948 - acrylic resins

polymerization shrinkage

History
(cont.)
 

1962 – Bis-GMA
 stronger

resin

1969 – filled composite resin
 improved

mechanical properties  less shrinkage  paste/paste system
   

1970’s – acid etching and microfills 1980’s – light curing and hybrids 1990’s – flowables and packables 2000’s – nanofills

Indications
Anterior restorations  Posterior restorations

 preventive

resin  conservative class 1 or 2

Contraindications
Large posterior restorations  Bruxism  Poor isolation


Advantages
Esthetics  Conservation of tooth structure  Adhesion to tooth structure  Low thermal conductivity  Alternative to amalgam


Disadvantages
Technique sensitivity  Polymerization shrinkage

 marginal

leakage  secondary caries  postoperative sensitivity


Decreased wear resistance

Composition


Resin matrix
 monomer  initiator  inhibitors
O CH2=C-C-O-CH2CH-CH2O CH3 OH

Bis-GMA
CH3 -CCH3 O OCH2CHCH2O-C-C=CH2 OH CH3

 pigments



Inorganic filler
 glass  quartz  colloidal

silica



Coupling Agent

Monomers
  

Binds filler particles together Provides “workability” Typical monomers

O CH2=C-C-O-CH2CH-CH2O CH3 OH

Bisphenol A glycidyl methacrylate (Bis-GMA)
CH3 -CCH3 O OCH2CHCH2O-C-C=CH2 OH CH3



Urethane dimethacrylate (UEDMA)
CH3 CH3 O O O...

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"Resin". Anti Essays. 14 Dec. 2018

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APA Citation

Resin. Anti Essays. Retrieved December 14, 2018, from the World Wide Web: http://parimatchstavki7.com/free-essays/Resin-188027.html