Temperature rise caused in the pulp chamber under simulated intrapulpal microcirculation with different light-curing modes

Ramoglu S. I., Karamehmetoglu H., Sari T., Usumez S.

Angle Orthodontist, vol.85, no.3, pp.381-385, 2015 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 85 Issue: 3
  • Publication Date: 2015
  • Doi Number: 10.2319/030814-164.1
  • Journal Name: Angle Orthodontist
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.381-385
  • Keywords: Temperature rise, Microcirculation, Light-curing units, Bonding
  • Istanbul Medipol University Affiliated: No


Objective: To evaluate and compare intrapulpal temperature rise with three different light-curing units by using a study model simulating pulpal blood microcirculation. Materials and Methods: The roots of 10 extracted intact maxillary central incisors were separated approximately 2 mm below the cement-enamel junction. The crowns of these teeth were fixed on an apparatus for the simulation of blood microcirculation in pulp. A J-type thermocouple wire was inserted into the pulp chamber through a drilled access on the palatal surfaces of the teeth. Four measurements were made using each tooth for four different modes: group 1, 1000 mW/cm2 for 15 seconds; group 2, 1200 mW/cm2 for 10 seconds; group 3, 1400 mW/cm2 for 8 seconds; and group 4, 3200 mW/cm2 for 3 seconds. The tip of the light source was positioned at 2 mm to the incisor's labial surface. Results: The highest temperature rise was recorded in group 1 (2.6°C ± 0.54°C), followed by group 2 (2.57°C ± 0.62°C) and group 3 (2.35°C ± 0.61°C). The lowest temperature rise value was found in group 4 (1.74°C ± 0.52°C); this value represented significantly lower DT values when compared to group 1 and group 2 (P = .01 and P = .013, respectively). Conclusions: The lowest intrapulpal temperature rise was induced by 3200 mW/cm2 for 3 seconds of irradiation. Despite the significant differences among the groups, the temperature increases recorded for all groups were below the critical value of 5.6°C.