TY - JOUR
T1 - Analysis of temperature increase in swine gingiva after exposure to a Polywave® LED light curing unit
AU - Maucoski, Cristiane
AU - Zarpellon, Driellen Christine
AU - dos Santos, Fabio Andre
AU - Lipinski, Leandro Cavalcante
AU - Campagnoli, Eduardo Bauml
AU - Rueggeberg, Frederick Allen
AU - Arrais, Cesar Augusto Galvão
N1 - Funding Information:
The authors are indebted to State University of Ponta Grossa and Augusta University for all support required to perform this study. The authors would also like to thank Ivoclar Vivadent Inc. for the donation of the light curing unit used. This study was financially supported by Araucaria Foundation, Parana, Brazil (grant #488/2014 ) and National Council for Scientific and Technological Development (PIBIC/CNPq, grant #120604/2015-9 ).
PY - 2017/11
Y1 - 2017/11
N2 - Objective This study evaluated the temperature increase in swine gingival temperature after exposure to light emitted by a Polywave® LED light curing unit (LCU, Bluephase 20i, Ivoclar Vivadent). Methods After local Ethics Committee approval (protocol 711/2015), 40 pigs were subjected to general anesthesia and the LCU tip was placed 5 mm from the buccal gingival tissue (GT) close to lower lateral incisors. A thermocouple probe (Thermes WFI, Physitemp) was inserted into the gingival sulcus before and immediately after exposure to light. Real-time temperature (°C) was measured after the following exposure modes were applied: High Power (20s-H, 40s-H, and 60s-H) or Turbo mode (5s-T), either with or without the presence of rubber dam (RD) interposed between the LCU tip and GT (n = 10). The presence of gingival lesions after the exposures was also evaluated. Peak temperature (°C) and the temperature increase during exposure over that of the pre-exposure baseline value (ΔT) data were analyzed using 2-way ANOVA followed by Bonferroni's post-hoc test (α = 5%). A binary logistic regression analysis determined the risk of gingival lesion development. Results Without RD, no significant difference in ΔT was observed among 20s-H, 40s-H, and 60s-H groups, which showed the highest temperature values, while the 5s-T exposure showed the lowest ΔT, regardless of RD. RD reduced ΔT only for the 20s-H group (p = 0.004). Gingival lesions were predominantly observed using 40s-H, with RD, and 60s-H, with and without RD. Significance Exposure to a LCU light might be harmful to swine gingiva only when high radiant exposure values are delivered, regardless of the use of RD.
AB - Objective This study evaluated the temperature increase in swine gingival temperature after exposure to light emitted by a Polywave® LED light curing unit (LCU, Bluephase 20i, Ivoclar Vivadent). Methods After local Ethics Committee approval (protocol 711/2015), 40 pigs were subjected to general anesthesia and the LCU tip was placed 5 mm from the buccal gingival tissue (GT) close to lower lateral incisors. A thermocouple probe (Thermes WFI, Physitemp) was inserted into the gingival sulcus before and immediately after exposure to light. Real-time temperature (°C) was measured after the following exposure modes were applied: High Power (20s-H, 40s-H, and 60s-H) or Turbo mode (5s-T), either with or without the presence of rubber dam (RD) interposed between the LCU tip and GT (n = 10). The presence of gingival lesions after the exposures was also evaluated. Peak temperature (°C) and the temperature increase during exposure over that of the pre-exposure baseline value (ΔT) data were analyzed using 2-way ANOVA followed by Bonferroni's post-hoc test (α = 5%). A binary logistic regression analysis determined the risk of gingival lesion development. Results Without RD, no significant difference in ΔT was observed among 20s-H, 40s-H, and 60s-H groups, which showed the highest temperature values, while the 5s-T exposure showed the lowest ΔT, regardless of RD. RD reduced ΔT only for the 20s-H group (p = 0.004). Gingival lesions were predominantly observed using 40s-H, with RD, and 60s-H, with and without RD. Significance Exposure to a LCU light might be harmful to swine gingiva only when high radiant exposure values are delivered, regardless of the use of RD.
KW - Dental curing lights
KW - Gingiva
KW - Temperature
UR - http://www.scopus.com/inward/record.url?scp=85027723682&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85027723682&partnerID=8YFLogxK
U2 - 10.1016/j.dental.2017.07.021
DO - 10.1016/j.dental.2017.07.021
M3 - Article
C2 - 28826611
AN - SCOPUS:85027723682
SN - 0109-5641
VL - 33
SP - 1266
EP - 1273
JO - Dental Materials
JF - Dental Materials
IS - 11
ER -