Photo-polymerization kinetics of a dental resin at a high temporal resolution.
Photo-polymerization kinetics of a dental resin at a high temporal resolution.
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高时间分辨率下牙科树脂的光聚合动力学。
DOI：
10.1016/j.jmbbm.2021.104884
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发表时间：
2021
影响因子：
3.9
通讯作者：
Labrie,Daniel
中科院分区：
文献类型：
--
作者：
Sullivan,Braden;Kalliecharan,David;Kostylev,Ivan;Earle,Guy;Stansbury,JeffreyW;Price,RichardB;Labrie,Daniel
研究目的：1）旨在以高时间分辨率测量在两种辐照度下光固化的牙科树脂基复合材料（RBC）的转化度（DC）的固有速率; 2）旨在确定DC速率最大时的转变时间; 3）使用两种不同的辐照度来测量转变时间的偏移; 4）旨在比较使用DC和收缩应变测量的过渡时间。方法样品（n = 20）1 mm厚× 10 mm直径的Filtek One散装填充修复A2色调（3 M Oral Care）在890 mW/cm 2和209 mW/cm 2的辐照度水平和T = 23 °C的初始样品温度下，用基于发光二极管的单发射峰（波长以455 nm为中心）光固化单元光固化20 s。使用衰减全反射（ATR）FTIR光谱法以每秒13个DC数据点的采样率实时测量DC。在现象学自催化模型内分析数据。此外，轴向收缩应变测量使用3个样品的红细胞具有相同的外部尺寸和类似的实验条件下，使用粘合盘方法和干涉technique.ResultsFor的890 mW/cm 2和209 mW/cm 2的辐照水平，发现随时间变化的DC与能够确定0.66 ± 0.05 s和2.3 ± 0.2 s的转变时间的模型一致，在这些时间点的DC为5.5 ± 0.2%和6.4 ± 0.2%。对于890 mW/cm 2和209 mW/cm 2辐照水平，分别在0.76 ± 0.01 s和1.98 ± 0.02 s处的最大线性应变速率在相应转变时间的两个标准偏差内。牙齿RBC的光聚合动力学可能太快而不能使用ATR-FTIR光谱法精确测量。一个可行的替代监测的动力学是通过测量的轴向收缩应变采用粘结盘的方法和干涉技术。
ObjectivesThis study: 1) aims to measure with high temporal resolution the intrinsic rate of the degree of conversion (DC) of a dental resin-based composite (RBC) photo-cured at two irradiances; 2) aims to determine the transition time at which the DC rate is maximum; 3) used two different irradiances to measure the shift in transition time; 4) aims to compare transition times measured using DC and shrinkage strain.MethodsSamples (n = 20) 1 mm thick by 10 mm diameter of Filtek One bulk-fill restorative A2 shade (3M Oral Care) were photocured for 20 s with a single emission peak (wavelength centered at 455 nm) light-emitting-diode-based light-curing unit at irradiance levels of 890 mW/cm2and 209 mW/cm2, and initial sample temperature of T = 23 °C. The DC was measured in real-time using Attenuated Total Reflection (ATR) FTIR spectroscopy with a sampling rate of 13 DC data points per second. The data were analyzed within a phenomenological autocatalytic model. In addition, the axial shrinkage strain was measured using 3 samples of the RBC with the same outer dimensions and under similar experimental conditions using the bonded disk method and an interferometric technique.ResultsFor the 890 mW/cm2and 209 mW/cm2irradiance levels, the DC with time was found to agree with the model enabling the determination of transition times of 0.66 ± 0.05 s and 2.3 ± 0.2 s, and the DC at these times of 5.5 ± 0.2% and 6.4 ± 0.2%. The maximum linear strain rate at 0.76 ± 0.01 s and 1.98 ± 0.02 s for the 890 mW/cm2and 209 mW/cm2irradiance levels, respectively, are within two standard deviations of the corresponding transition times.SignificanceAt an irradiance level much greater than 1000 mW/cm2, the photo-polymerization kinetics of a dental RBC may be too fast to be measured accurately using ATR-FTIR spectroscopy. A viable alternative to monitor the kinetics is through the measurements of the axial shrinkage strain employing the bonded disk method and an interferometric technique.