TY - JOUR
T1 - In vivo temperature rise in anesthetized human pulp during exposure to a polywave LED light curing unit
AU - Runnacles, Patrício
AU - Arrais, Cesar Augusto Galvão
AU - Pochapski, Marcia Thais
AU - Dos Santos, Fábio André
AU - Coelho, Ulisses
AU - Gomes, João Carlos
AU - De Goes, Mário Fernando
AU - Gomes, Osnara Maria Mongruel
AU - Rueggeberg, Frederick Allen
N1 - Publisher Copyright:
© 2015 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
PY - 2015/5/1
Y1 - 2015/5/1
N2 - Objectives This in vivo study evaluated pulp temperature (PT) rise in human premolars during exposure to a light curing unit (LCU) using selected exposure modes (EMs). Methods After local Ethics Committee approval, intact first upper premolars, requiring extraction for orthodontic reasons, from 8 volunteers, received infiltrative and intraligamental anesthesia. The teeth (n = 15) were isolated using rubber dam and a minute pulp exposure was attained. A sterile probe from a wireless, NIST-traceable, temperature acquisition system was inserted directly into the coronal pulp chamber, and real time PT (°C) was continuously monitored while the buccal surface was exposed to polywave light from a LED LCU (Bluephase 20i, Ivoclar Vivadent) using selected EMs allowing a 7-min span between each exposure: 10-s either in low (10-s/L) or high (10-s/H); 5-s-turbo (5-s/T); and 60-s-high (60-s/H) intensities. Peak PT values and PT increases from baseline (ΔT) after exposure were subjected to one-way, repeated measures ANOVAs, and Bonferroni's post hoc tests (α = 0.05). Linear regression analysis was performed to establish the relationship between applied radiant exposure and ΔT. Results All EMs produced higher peak PT than the baseline temperature (p < 0.001). The 60-s/H mode generated the highest peak PT and ΔT (p < 0.001), with some teeth exhibiting ΔT higher than 5.5 °C. A significant, positive relationship between applied radiant exposure and ΔT (r2 = 0.916; p < 0.001) was noted. Significance Exposing intact, in vivo anesthetized human upper premolars to a polywave LED LCU increases PT, and depending on EM and the tooth, PT increase can be higher than the critical ΔT, thought to be associated with pulpal necrosis.
AB - Objectives This in vivo study evaluated pulp temperature (PT) rise in human premolars during exposure to a light curing unit (LCU) using selected exposure modes (EMs). Methods After local Ethics Committee approval, intact first upper premolars, requiring extraction for orthodontic reasons, from 8 volunteers, received infiltrative and intraligamental anesthesia. The teeth (n = 15) were isolated using rubber dam and a minute pulp exposure was attained. A sterile probe from a wireless, NIST-traceable, temperature acquisition system was inserted directly into the coronal pulp chamber, and real time PT (°C) was continuously monitored while the buccal surface was exposed to polywave light from a LED LCU (Bluephase 20i, Ivoclar Vivadent) using selected EMs allowing a 7-min span between each exposure: 10-s either in low (10-s/L) or high (10-s/H); 5-s-turbo (5-s/T); and 60-s-high (60-s/H) intensities. Peak PT values and PT increases from baseline (ΔT) after exposure were subjected to one-way, repeated measures ANOVAs, and Bonferroni's post hoc tests (α = 0.05). Linear regression analysis was performed to establish the relationship between applied radiant exposure and ΔT. Results All EMs produced higher peak PT than the baseline temperature (p < 0.001). The 60-s/H mode generated the highest peak PT and ΔT (p < 0.001), with some teeth exhibiting ΔT higher than 5.5 °C. A significant, positive relationship between applied radiant exposure and ΔT (r2 = 0.916; p < 0.001) was noted. Significance Exposing intact, in vivo anesthetized human upper premolars to a polywave LED LCU increases PT, and depending on EM and the tooth, PT increase can be higher than the critical ΔT, thought to be associated with pulpal necrosis.
KW - Body temperature changes
KW - Body temperature/radiation effects
KW - Dental pulp cavity
KW - Dental pulp/radiation effects
KW - Humans
KW - Light-curing of dental resins
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U2 - 10.1016/j.dental.2015.02.001
DO - 10.1016/j.dental.2015.02.001
M3 - Article
C2 - 25711700
AN - SCOPUS:84927911711
SN - 0109-5641
VL - 31
SP - 505
EP - 513
JO - Dental Materials
JF - Dental Materials
IS - 5
ER -