Parameters Influencing Increase in Pulp Chamber Temperature with Light-curing Devices: Curing Lights and Pulpal Flow Rates
Parameters Influencing Increase in Pulp Chamber Temperature with Light-curing Devices: Curing Lights and Pulpal Flow Rates
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DOI：
10.2341/09-234-l
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发表时间：
2010-05-01
影响因子：
2.2
通讯作者：
Heintze, S. D.
中科院分区：
文献类型：
--
作者：
Park, S-H;Roulet, J-F;Heintze, S. D.
本实验研究了不同光强和不同流量的光固化对光固化过程中牙髓温度升高和光凝结束后牙髓温度下降的影响。温度传感器的尖端位于上颌前磨牙颊侧牙髓牙本质壁上。在牙齿的腭部和颊根部插入金属管，一根用于进水，另一根用于水出。这些管子连接到一个泵上，以控制流量。流量设置为：L 4.2亩/分钟、L 28亩/分钟或L 70亩/分钟。在每个流速下，使用四种不同的光固化灯，从颊侧面至颊表面1 mm处对未准备好的牙齿进行光固化。温度数据每秒被记录并存储在计算机上，持续三分钟。所使用的固化灯是：Astralis10(QTH(高)，Ivoclar Vivadent)，BluePhase16i(LED(Conv)，Ivoclar Vivadent)和两个实验LED固化灯(LED(Exp2000)，LED(Exp3000)，Ivoclar Vivadent)。功率密度分别为1200 mW/cm(2)、1600 mW/cm(2)、2000 mW/cm(2)和3000 mW/cm(2)。固化灯、LED(Conv)、LED(Exp2000)和LED(Exp3000)被激活60秒，而QTH(高)被激活30秒。用双因素方差分析和后置Tukey检验(p LED(Conv)和gt；qth(High))分析最高牙髓内温度(T(Max))和关灯后30s的温度变化率(S 30LO)。不同流速下的T(Max)差异无统计学意义(p>；0.05)。固化光和流速都影响S(30LO)(p发光二极管(Ex2000)和gt；发光二极管(Cv)，qth(高)(p
This laboratory study examined the effects of curing lights with different light intensities and changing flow rate on the increase in pulpal temperature during the light curing process and the rate of the subsequent decrease in temperature after the termination of light curing.The tip of a temperature sensor was positioned on the pulpal dentinal wall of the buccal side of the maxillary premolar. Metal tubes were inserted in the palatal and buccal root of the tooth, one for water inflow and the other for water outflow. The tubes were connected to a pump to control the flow rate. The water flow rate was set to 4.2 mu l/minute, 28 mu l/minute or 70 mu l/minute. At each flow rate, the unprepared tooth was light cured from the buccal side 1 mm from the buccal surface, using four different curing lights. The temperature data were recorded and stored on a computer every second for three minutes. The curing lights that were used were: Astralis 10 (QTH(high), Ivoclar Vivadent), Bluephase 16i (LED(conv), Ivoclar Vivadent) and two experimental LED-curing lights (LED(exp2000), LED(exp3000), Ivoclar Vivadent). The power densities were 1200 mW/cm(2), 1600 mW/cm(2), 2000 mW/cm(2) and 3000 mW/cm(2), respectively. The curing lights, LED(conv), LED(exp2000) and LED(exp3000) were activated for 60 seconds, and the QTH(high) was activated for 30 seconds. The maximum intrapulpal temperature (T(MAX)) and rate of temperature change at 30 seconds after turning off the light (S(30LO)) were analyzed by two-way ANOVA with a post-hoc Tukey test (p LED(conv)> QTH(high). There was no difference in T(MAX) between the different flow rates (p>0.05). Both the curing lights and flow rates affected the S(30LO) (p LED(exp2000)> LED(conv), QTH(high) (p