Guarneri Juliana Anany Gonzales, Maucoski Cristiane, Ghaffari Soheil, MacNeil Brett Daniel, Price Richard Bengt, Arrais Cesar Augusto Galvão
Department of Dental Clinical Sciences, Dalhousie University, Faculty of Dentistry, Halifax, Nova Scotia, Canada; Department of Restorative Dentistry, State University of Ponta Grossa, Ponta Grossa, Parana, Brazil.
Department of Dental Clinical Sciences, Dalhousie University, Faculty of Dentistry, Halifax, Nova Scotia, Canada.
Dent Mater. 2025 Jan;41(1):42-50. doi: 10.1016/j.dental.2024.10.013. Epub 2024 Nov 6.
This study evaluated the degree of conversion (DC), polymerization kinetics, and temperature of a new self-cure bulk-fill resin-based composite (Stela Automix, SDI).
The study was divided into seven groups: (1) Stela Primer, (2) Stela Automix, (3) Stela Automix exposed to light for 20 s after 100 s, (4) Stela Primer with Stela Automix, (5) Stela Primer with Stela Automix and exposed to light for 20 s after 100 s, (6) Scotchbond Universal with Stela Automix, and (7) Scotchbond Universal with Stela Automix and exposed to light for 20 s after 100 s. The real-time reaction rates and DC at the bottom of 2 mm thick specimens at ∼32 °C were measured at 720 s after insertion using a spectrometer with an Attenuated Total Reflectance detector. The temperature of Stela, Stela exposed to light, Stela Primer with Stela, and Stela Primer with Stela exposed to light were measured by an infrared thermal camera in human molar teeth with Class I cavities. The temperature was recorded in real-time every 0.03 s for 720 s. The results were compared with ANOVA and Tukey's multiple comparison test (α = 0.05).
The highest degree of conversion (DC) at the 2 mm depth was achieved when Stela Primer was combined with Stela (72.4 ± 3.5 % at 720 s). Stela could self-cure independently, but not as rapidly or effectively as when used with its Primer. The greatest temperature increase was for the light-cured Stela, followed by Stela Primer with Stela RBC exposed to light for 20 s. The Scotchbond Universal bonding system did not significantly increase the DC compared to Stela alone, except when exposed to light for 20 s, which slightly increased the final DC. Exposing Stela to light for 20 s did not improve the final DC of Stela as much as using the Stela Primer, but it did increase the temperature and prolonged the time taken to return to 37 °C.
The Stela primer accelerates the degree of conversion of Stela. The reaction occurred rapidly and achieved a higher DC at the bottom of the specimens where the Stela was in contact with the Stela primer. Exposing Stela to light for 20 s is not recommended. Instead, Stela should be used with Stela Primer.
本研究评估了一种新型自固化大体积充填树脂基复合材料（Stela Automix，SDI）的转化率（DC）、聚合动力学和温度。
本研究分为七组：（1）Stela底漆；（2）Stela Automix；（3）Stela Automix在100秒后光照20秒；（4）Stela底漆与Stela Automix；（5）Stela底漆与Stela Automix并在100秒后光照20秒；（6）Scotchbond Universal与Stela Automix；（7）Scotchbond Universal与Stela Automix并在100秒后光照20秒。使用带有衰减全反射检测器的光谱仪，在插入后720秒时测量约32°C下2毫米厚试样底部的实时反应速率和DC。通过红外热像仪在具有I类洞形的人类磨牙中测量Stela、光照后的Stela、Stela底漆与Stela以及光照后的Stela底漆与Stela的温度。每隔0.03秒实时记录温度，持续720秒。结果通过方差分析和Tukey多重比较检验进行比较（α = 0.05）。
当Stela底漆与Stela结合时，在2毫米深度处实现了最高转化率（720秒时为72.4±3.5%）。Stela可以独立自固化，但不如与底漆一起使用时迅速或有效。光固化的Stela温度升高最大，其次是光照20秒的Stela底漆与Stela RBC。与单独使用Stela相比，Scotchbond Universal粘结系统除了光照20秒时略微提高了最终DC外，并没有显著提高DC。将Stela光照20秒并没有像使用Stela底漆那样提高Stela的最终DC，但确实提高了温度并延长了恢复到37°C所需的时间。
Stela底漆加速了Stela的转化率。反应迅速发生，并且在Stela与Stela底漆接触的试样底部实现了更高的DC。不建议将Stela光照20秒。相反，Stela应与Stela底漆一起使用。
