Rahiotis C, Zinelis S, Eliades G, Eliades T
Department of Operative Dentistry, Faculty of Dentistry, National and Kapodistrian University of Athens, Thivon 2, Goudi, 11527 Athens, Greece.
Department of Biomaterials, Faculty of Dentistry, National and Kapodistrian University of Athens, Thivon 2, Goudi, 11527 Athens, Greece.
J Dent. 2015 Jun;43(6):715-9. doi: 10.1016/j.jdent.2015.03.010. Epub 2015 Apr 8.
This study investigated the curing efficiency, the extent of atmospheric oxygen inhibition to the polymerization reaction and the mechanical properties of a new resin-infiltration system for caries treatment.
The curing efficiency was estimated by measuring the percentage degree of cure (%DC) of thin resin films (h: 150μm, Ø: 5mm, n=3), 10min after 40s exposure to a quartz halogen bulb (750mW/cm2) light curing unit (Optilux 501, Demetron/Kerr, USA), in the absence of O2, by micro ATR-FTIR spectroscopy. The extent of O2 inhibition on resin film setting (width in μm) was assessed by transmission optical microscopy on thin films (h: 150μm, Ø: ∼7mm, n=5) placed between two transparent cover slips and exposed to air from lateral sites. For each sample the extent of inhibition was measured at 5 different locations. The mechanical properties were tested employing Instrumented Indentation Testing according to ISO 14577:2002. Resin specimens (h: 2mm, Ø: 10mm, n=5) were prepared employing cylindrical teflon moulds enclosed in transparent matrix strips and glass slides as before. The measurements were performed employing a Vickers indenter attached to a universal hardness testing machine (ZHU2.5/Z2.5 plus test Xpert software, Zwick/Roell, Ulm, Germany). The parameters tested were Martens Hardness (MH), Vickers Hardness (VHN), Indentation Elastic Modulus (EIT) and elastic to total ratio of indentation work (ηIT). For all these tests, specimens of a conventional light-curing bonding resin (HB-Heliobond, Ivoclar-Vivadent, FL) prepared as above were used as control. Student t-test was used to identify statistically significant differences between the two materials in the parameters tested (a: 0.05).
The results of the materials tested were: (a) [% DC]; IC: 57.4±1.5, HB: 59.8±2.4, (b) [Width of O2 inhibition/μm]; IC: 33.1±6.5, HB: 23.6±4.4, (c) [MH/N/mm(2)] IC; 116±16, HB: 261±35, (d) [VHN]; IC; 15.4±2.5, HB: 22.1±1.8, (e) [EIT/(GPa)]; IC; 2.3±0.4, HB: 7.5±0.5, and (g) [ηIT (%)] IC; 50.3±3.4, HB: 35.1±1.9. The IC presented no significant difference in terms of % DC, higher thickness of the inhibited layer, lower MH, VHN, EIT and greater ηIT values than HB.
The resin-infiltrating system for incipient caries treatment demonstrated the same curing efficiency with a conventional unfilled bonding resin, but exhibited higher extent of oxygen inhibition, lower hardness, lower elastic modulus and higher plastic to elastic indentation energy.
本研究调查了一种用于龋齿治疗的新型树脂渗透系统的固化效率、大气氧对聚合反应的抑制程度以及机械性能。
通过测量薄树脂膜（h：150μm，Ø：5mm，n = 3）在无氧条件下，经40秒暴露于石英卤素灯（750mW/cm²）光固化单元（Optilux 501，Demetron/Kerr，美国）后10分钟的固化度百分比（%DC），采用微型ATR - FTIR光谱法评估固化效率。通过透射光学显微镜，对置于两个透明盖玻片之间并从侧面暴露于空气中的薄膜（h：150μm，Ø：约7mm，n = 5）评估氧对树脂膜固化的抑制程度（宽度，单位为μm）。对于每个样品，在5个不同位置测量抑制程度。根据ISO 14577:2002采用仪器化压痕测试来测试机械性能。如前所述，使用圆柱形聚四氟乙烯模具，将其封装在透明基质条和载玻片中来制备树脂标本（h：2mm，Ø：10mm，n = 5）。测量使用连接到万能硬度试验机（ZHU2.5/Z2.5 plus测试Xpert软件，Zwick/Roell，德国乌尔姆）的维氏压头进行。测试的参数有马氏硬度（MH）、维氏硬度（VHN）、压痕弹性模量（EIT）以及压痕功的弹性与总比值（ηIT）。对于所有这些测试，将按上述方法制备的传统光固化粘结树脂（HB - Heliobond，Ivoclar - Vivadent，佛罗里达州）标本用作对照。采用学生t检验来确定两种材料在测试参数方面的统计学显著差异（α：0.05）。
测试材料的结果如下：（a）[%DC]；IC：57.4±1.5，HB：59.8±2.4；（b）[氧抑制宽度/μm]；IC：33.1±6.5，HB：23.6±4.4；（c）[MH/N/mm²] IC；116±16，HB：261±35；（d）[VHN]；IC；15.4±2.5，HB：22.1±1.8；（e）[EIT/(GPa)]；IC；2.3±0.4，HB：7.5±0.5；以及（g）[ηIT(%)] IC；50.3±3.4，HB：35.1±1.9。与HB相比，IC在%DC方面无显著差异，但抑制层厚度更高，MH、VHN、EIT更低，且ηIT值更大。
用于早期龋齿治疗的树脂渗透系统显示出与传统未填充粘结树脂相同的固化效率，但表现出更高程度的氧抑制、更低的硬度、更低的弹性模量以及更高的塑性与弹性压痕能量。
