Amuk Nisa Gül, Kurt Gökmen, Er Özgür, Çakmak Gülşen, Aslantaş Veysel
Department of Orthodontics, Erciyes University School of Dentistry, Kayseri, Turkey.
Department of Orthodontics, Bezmialem Vakif University School of Dentistry, İstanbul, Turkey.
Turk J Orthod. 2019 Mar;32(1):22-27. doi: 10.5152/TurkJOrthod.2019.19015. Epub 2019 Mar 1.
The purpose of this study was to assess the temperature changes and cooling times during orthodontic bonding by a light-emitting diode (LED) and plasma arc lights (PAC) in different time and power modes with thermal imaging.
A total of 100 human permanent upper first premolar teeth were included in the study. Five groups were conducted, 20 teeth each, and different energy outputs of curing lights were used for adhesive polymerization with different exposure times. The temperature changes in the pulp space and cooldown times were measured by a thermal imaging system. A paired t-test, analysis of variance (ANOVA), and Student-Newman-Keuls multiple comparison tests were used for data analysis.
A statistically significant temperature rise was detected with all curing lights (p<0.05). The greatest temperature changes were observed in the LED standard mode with 10 seconds of exposure time (6.66±1.98°C) and LED extra power mode with 6 seconds of exposure time (6.50±1.64°C) among groups, while using PAC for 3 seconds created the smallest temperature increase (1.81±0.99°C). An application of the LED extra power mode for 6 seconds exhibited the longest cooldown time (205.91±47.48 seconds), and the shortest cooldown time was detected as 71.30±43.15 seconds with the PAC 3-second application.
LED lights with an increased exposure time induced significant temperature rises, while no PAC light group exceeded the critical threshold value. The exposure time is more important than the energy output level of the light-curing system on temperature increments of the pulp chamber.
本研究旨在通过热成像评估发光二极管（LED）和等离子弧光灯（PAC）在不同时间和功率模式下进行正畸粘结时的温度变化和冷却时间。
本研究共纳入100颗人类恒牙上颌第一前磨牙。分为五组，每组20颗牙，使用不同能量输出的固化灯进行不同曝光时间的粘结剂聚合。通过热成像系统测量牙髓腔的温度变化和冷却时间。采用配对t检验、方差分析（ANOVA）和Student-Newman-Keuls多重比较检验进行数据分析。
所有固化灯均检测到有统计学意义的温度升高（p<0.05）。各组中，曝光时间为10秒的LED标准模式（6.66±1.98°C）和曝光时间为6秒的LED额外功率模式（6.50±1.64°C）观察到的温度变化最大，而使用PAC 3秒产生的温度升高最小（1.81±0.99°C）。LED额外功率模式应用6秒的冷却时间最长（205.91±47.48秒），PAC应用3秒的冷却时间最短，为71.30±43.15秒。
曝光时间增加的LED灯会引起显著的温度升高，而PAC灯组均未超过临界阈值。对于牙髓腔温度升高，曝光时间比光固化系统能量输出水平更重要。
