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Oxygen-inhibited surface layers on Microfill Pontic.

A Peutzfeldt¹, E Asmussen

¹Department of Technology, Royal Dental College, Copenhagen, Denmark.

Acta Odontologica Scandinavica

|February 1, 1989

Summary

Irradiation reduces the oxygen-inhibited layer in Microfill Pontic resin cement. A 20-second irradiation time is sufficient for maximum reduction, improving composite resin polymerization.

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Area of Science:

Dental Materials Science
Polymer Chemistry

Background:

Oxygen inhibits the radical polymerization of composite resins, leading to an oxygen-inhibited surface layer.
This layer can compromise the mechanical properties and bonding of dental restorations.

Purpose of the Study:

To investigate the effect of irradiation on reducing the oxygen-inhibited surface layer of Microfill Pontic, a self- and photo-curing resin cement.
To determine the optimal irradiation time for maximum reduction of this layer.

Main Methods:

Measurement of the oxygen-inhibited layer thickness using a dial gauge technique.
Comparison of irradiated and non-irradiated Microfill Pontic specimens.

Main Results:

Irradiation significantly reduces the depth of the oxygen-inhibited surface layer.
An irradiation time of 20 seconds was found to be sufficient to achieve the maximum reduction in layer thickness.

Conclusions:

Irradiation is an effective method for minimizing oxygen inhibition during the polymerization of Microfill Pontic.
Optimized irradiation protocols can enhance the surface properties and clinical performance of photo-cured composite resins.

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