Al-Zain Afnan O, Platt Jeffrey A
Operative and Esthetic Dentistry Division, Restorative Dentistry Department, Faculty of Dentistry, King Abdulaziz University.
Department of Biomedical Sciences and Comprehensive Care, Indiana University School of Dentistry, Indiana University Purdue University Indianapolis.
Dent Mater J. 2021 Jan 31;40(1):202-208. doi: 10.4012/dmj.2020-002. Epub 2020 Oct 1.
This study investigated the influence of curing distance on µ-flexural strength (µ-FS) of a nano-hybrid composite, cured using the manufacturer-recommended curing time (MCT), compared to a consistent radiant exposure (CRE) using three different light-curing units (LCUs). Beams (6×2×1 mm) were cured using the MCT or CRE with a quartz-tungsten-halogen (QTH); a single-emission-peak light-emitting-diode (SLED), or a multiple-emission-peak light-emitting-diode (MLED) LCU. Specimens were cured at 0-, 2- or 8-mm distances (n=10) and the bottom irradiance and CRE were measured using a Managing Accurate Resin Curing-Resin Calibrator spectrometer. µ-FS testing was performed, and data analyzed using two-way ANOVA and Tukey multiple comparison tests (α=0.05). Mean bottom irradiance was (25.4-99.7 mW/cm) and CRE (0.31-1.11 J/cm). µ-FS was 422.1-516.6 MPa (MCT) and 440.4-490.4 MPa (CRE). Comparing CRE to MCT showed that µ-FS significantly decreased using the CRE at 2-mm (QTH) or the MCT at 2- and 8-mm (SLED). µ-FS may be significantly impacted by the curing protocol.
本研究调查了固化距离对一种纳米混合复合材料的微弯曲强度（µ-FS）的影响，该复合材料采用制造商推荐的固化时间（MCT）进行固化，并与使用三种不同光固化单元（LCU）的恒定辐射暴露（CRE）进行比较。使用MCT或CRE，通过石英钨卤素灯（QTH）、单发射峰发光二极管（SLED）或多发射峰发光二极管（MLED）LCU对梁（6×2×1毫米）进行固化。标本在0、2或8毫米的距离下固化（n = 10），并使用精确管理树脂固化-树脂校准光谱仪测量底部辐照度和CRE。进行µ-FS测试，并使用双向方差分析和Tukey多重比较检验（α = 0.05）对数据进行分析。平均底部辐照度为（25.4 - 99.7毫瓦/平方厘米），CRE为（0.31 - 1.11焦/平方厘米）。µ-FS为422.1 - 516.6兆帕（MCT）和440.4 - 490.4兆帕（CRE）。将CRE与MCT进行比较表明，在2毫米（QTH）处使用CRE或在2毫米和8毫米（SLED）处使用MCT时，µ-FS显著降低。固化方案可能会对µ-FS产生显著影响。
