Relationship between the polymerization distance of monowave and polywave light-curing units and the irradiance and physical properties of dental resin-based composites.

IF 1.9 4区 医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE
Madelin Ruiz-Peñarrieta, María de Los Angeles Moyaho-Bernal, José A Salazar-Vergara, Juana P Ramírez Ortega, Laura E Serrano de la Rosa, Jacqueline A Rodríguez-Chávez, Abigailt Flores-Ledesma
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Abstract

Purpose: To evaluate the influence of the polymerization distance of monowave and polywave light curing units (LCUs) on the measured irradiance relative to the value reported by the manufacturer in relation to the physical properties of resin-based composites (RBCs).

Methods: Four LCUs were used: one monowave and three polywave. The irradiance was measured with a digital radiometer. Depth of cure (DC) and flexural strength (FS) tests were performed according to ISO 4049:2019 at polymerization distances of 0 mm and 5 mm.

Results: The irradiance of all LCUs was higher than that reported by the manufacturer (>25-64%). The irradiance of the four LCUs was reduced when polymerization was performed at between 0 to 5 mm (paired t-test, P < 0.001). The DC at 0 mm was similar in all groups but was significantly decreased at 5 mm distance (ANOVA P < 0.001). FS showed differences among the LCUs at 0 mm (ANOVA P < 0.001) and was affected by the polymerization distance. The elastic modulus was unaffected by the LCU used or the distance (ANOVA P > 0.001).

Conclusions: The LCU must be positioned as near as possible to RBCs during the polymerization process, as increased distance negatively affects the depth of cure and flexural strength.

单波和多波光固化单元的聚合距离与牙科树脂基复合材料的辐照度和物理性能之间的关系。
目的:评估单波和多波光固化单元(LCU)的聚合距离对测量辐照度的影响,相对于制造商报告的值,这与树脂基复合材料(RBC)的物理性质有关:方法:使用了四台 LCU:一台单波,三台多波。辐照度用数字辐射计测量。根据 ISO 4049:2019,在聚合距离为 0 毫米和 5 毫米时进行固化深度(DC)和弯曲强度(FS)测试:结果:所有 LCU 的辐照度均高于制造商报告的值 (>25-64%)。当聚合距离在 0 至 5 毫米之间时,四个 LCU 的辐照度都有所降低(配对 t 检验,P < 0.001)。各组在 0 毫米处的 DC 相似,但在 5 毫米处显著降低(方差分析,P < 0.001)。FS 在 0 mm 时显示出 LCU 之间的差异(方差分析 P < 0.001),并受到聚合距离的影响。弹性模量不受所使用的 LCU 或距离的影响(方差分析 P > 0.001):结论:在聚合过程中,LCU 的位置必须尽可能靠近 RBC,因为距离增加会对固化深度和弯曲强度产生负面影响。
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来源期刊
Journal of oral science
Journal of oral science DENTISTRY, ORAL SURGERY & MEDICINE-MATERIALS SCIENCE, BIOMATERIALS
CiteScore
3.80
自引率
0.00%
发文量
58
期刊介绍: Information not localized
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