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Temperature rise during experimental light-activated bleaching.

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Lasers in Medical Science
|June 20, 2013
PubMed
Summary
This summary is machine-generated.

Different light activation methods for bleaching gels produce varying temperature increases. ZOOM2 and focused femtosecond lasers cause significant heat, while LED405, OLED, and unfocused femtosecond lasers are safer for tooth pulp and surface temperatures.

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Area of Science:

  • Dental Materials Science
  • Biomedical Engineering
  • Photochemistry

Background:

  • Dental bleaching efficacy is influenced by light activation methods.
  • Understanding temperature changes during bleaching is crucial for pulp vitality and patient safety.
  • Various light sources, including lasers and LEDs, are employed for activating bleaching agents.

Purpose of the Study:

  • To evaluate and compare surface and intrapulpal temperature increases induced by different light activation systems used with bleaching gels.
  • To determine the safety profile of various light sources concerning heat generation during dental bleaching procedures.

Main Methods:

  • K-type thermocouple and infrared thermometer were used to measure temperature changes during 15- or 30-min bleaching treatments.
  • Tested light sources included ZOOM2, focused and unfocused femtosecond lasers, 405nm light-emitting diode (LED405), and organic light-emitting diode (OLED).
  • Five bleaching agents and Vaseline (control) were applied to the tooth surface; generalized estimating equation (GEE) model analyzed temperature differences.

Main Results:

  • ZOOM2 and focused femtosecond laser caused the highest mean temperature increases (21.1°C and 15.7°C intrapulpal; 22.8°C and 16.8°C surface, respectively).
  • Unfocused femtosecond laser, LED405, and OLED induced significantly lower temperature increases (p < 0.001), with intrapulpal rises up to 2.7°C, 2.5°C, and 1.4°C, respectively.
  • Significant temperature differences were observed between pulp chamber and tooth surface measurements for all tested light sources and bleaching agents.

Conclusions:

  • ZOOM2 and focused femtosecond laser generate substantial heat, necessitating caution during dental bleaching.
  • LED405, OLED, and unfocused femtosecond laser present safer alternatives due to significantly lower temperature elevations.
  • Bleaching agents and Vaseline can act as thermal insulators, potentially mitigating temperature rise.