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| 2010-22 |
| 22-1 |
ISSN (Print) 1013-9052
EISSN 1658-3558
P.O. Box 52500,
Riyadh 11563,
Kingdom of Saudi Arabia
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Effect of residual monomer on the strength of restorative resins
E. Osman, BDS, A.
El-Kady, BDS,MSc,PhD,
Quantity of the remaining unreacted double bonds within the free monomers influences the mechanical and physical properties of restorative resins. Clinically, the residual monomer may result in unfavorable biologic symptoms. Five proprietary composite resins were investigated using infrared spectrophotometry. The change in the monomer content was monitored through the change in absorbance of the C=C bond resonating at 1640 cm'1, during the polymerization reaction at 37°C. The materials, investigated under conditions comparable with optimal clinical circumstance, showed values of residual monomer ranging from 6% to 43%. The diametral tensile strength has decreased as the quantity of residual monomer has increased in a simple linear relationship. The final properties of a dental composite restorative material are directly related both to the chemical composition of the monomer system and the degree of conversion to polymer which has occurred.
Saudi Dental Journal 1990;2(1):3-6. |