Temperature changes caused by light curing units on dentine of primary teeth

Authors:

ABSTRACT

Aim

This was to determine the temperature changes produced in dentine discs of primary teeth placed below a
glass ionomer, microhybrid flow resin or microhybrid resin during the photocuring process with conventional halogen
lamps and LEDs at different distances. Study design: Experimental design.

Methods

This in vitro study
was carried out in the research laboratory of the Universitat International de Catalunya. We cut 1 mm thick dentine discs with
the IsoMet 1000 cutting machine. Thereafter, we cut stainless steel rings of different heights. Subsequently, to facilitate the
temperature measurement, we prepared silicone moulds, in which the dentine disc, stainless steel ring and the digital
thermometer/ thermocouple were positioned. Once the silicone mould was finished, a 2 mm thick layer of the restorative
material was placed on the dentine disc. Finally, the polymerisation process was conducted according to the times
recommended by the manufacturers, and the temperature produced was recorded at the end of the procedure. Statistical
evaluation: Replies were analyzed using the STATGRAPHICS Plus Version 5.0 statistics software system, in order to obtain
comparative diagrams and graphs using the ANOVA multifactorial system.

Results

The photocuring lamps used on the
restorative materials produced statistically significant differences in temperature, with p = 0.00001.

Conclusion

Halogen
lamps cause a greater temprature rise in materials than LEDs lamps, and the greatest rise is produced when microhybrid flow
resin is photocured with the Optilux 501 halogen lamp.

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