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In vitro changes in pulpal temperature during light exposure at different pulpal fluid flows.

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Higher pulp fluid flow rates significantly reduced pulp temperature (PT) increases during light-curing. Different high-powered light-curing units (LCUs) and modes produced varying temperature rises, linked to radiant exposure.

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Area of Science:

  • Dental Materials Science
  • Biomedical Engineering

Background:

  • Pulp temperature increase during light-curing is a clinical concern.
  • Optimizing light-curing unit (LCU) parameters is crucial for minimizing thermal effects.

Purpose of the Study:

  • To evaluate the impact of varying pulp fluid flow rates on pulp temperature (PT) rise.
  • To compare the thermal effects of different high-powered LCUs and exposure modes.

Main Methods:

  • In vitro evaluation of three LCUs (Bluephase PowerCure, PinkWave, Valo X) in Class II cavities.
  • Measurement of PT using a thermocouple at simulated pulp fluid flow rates (0.026, 0.2, 1 mL/min).
  • Analysis of spectral radiant power, irradiance, and radiant exposure for each LCU and mode.

Main Results:

  • Pulp fluid flow rate of 1 mL/min significantly reduced PT compared to lower rates (0.026 and 0.2 mL/min).
  • LCUs and exposure modes generated different temperature increases (ΔT).
  • Higher radiant exposure and spectral radiant power correlated with increased PT rise; PinkWave-10s produced the highest ΔT, while PowerCure-3s and PinkWave-3s produced the lowest.

Conclusions:

  • Increased pulp fluid flow can mitigate thermal stress during light-curing.
  • LCU selection and mode settings significantly influence the risk of pulp thermal damage.
  • Further research should investigate clinical implications of these findings.