engleski

Different photopolymerization techniques: advantages and disadvantages

Despite considerable improvements of dental composites present day materials still suffer from inadequate degree of conversion and problems of marginal adaptation. Importance is attached to the developments of new dentin bonding agents, chemistry of resins and fillers rather than to any increase in intrapulpal temperature that occurs in composite placement from the material itself and from light curing unit. At present, halogen lamp, the most often used light source for composite curing has lot of disadvantages. It is more efficient in red and infrared lights and only slightly energetic in the zone of camphorquinone absorption of maximum at 470 nm. It is common knowledge that red light produces more heat thus means temperature rise without significantly improving photopolymerization. On the other side plasma light rapid curing conflicts the suggested theory that it is better to polymerize slowly to achieve minimal internal tension. Third curing technology based on the minimal energy of solid state, highly durable light emitting diodes could ensure satisfying degree of conversion, minimal temperature rise and polymerization shrinkage. The future will show whether the attention needs to be turned to the low but efficient intensities of blue diodes, rapid, high-energy plasma curing, or halogen lights of different modes.

composite resins; photopolymerization

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