Department of Conservative Dentistry and Endodontics, Vananchal Dental College and Hospital, Garhwa, Jharkhand, India.
Department of Pedodontics, Vananchal Dental College and Hospital, Garhwa, Jharkhand, India.
J Contemp Dent Pract. 2022 Jan 1;23(1):61-65.
Aim of the current research is to establish and assess the microleakage in bulk-fill composite, nanohybrid ormocer-based resins, and nanofilled composite resin core build-up materials employing the dye-penetration technique.
Sixty human mandibular first premolar teeth with a solitary root canal without dental caries were chosen for this research. Each specimen was subjected to decoronation of 2 mm from the cementoenamel junction (CEJ), following which the root canal treatment procedure was rendered complete. A space for the post was made for all the 60 samples. Following positioning of the post, specimens were allocated into one of the following three investigational groups (20 specimens in every group) on the basis of the core build-up materials used as group I: bulk-fill composites, group II: nanohybrid ormocer-based resins, and group III: nanofilled resin composites. Direct composite was used for core build-up and subjected to light-curing. Following this, the specimens were immersed in 1% methylene blue solution for 24 hours interval. Each section was evaluated for dye diffusion employing a stereomicroscope with software at a magnifying power of 40× and surface contact between dentin and base of the material was evaluated under scanning electron microscope.
Nanohybrid ormocer-based composites exhibited the least microleakage at 1.12 ± 0.14, in pursuit by nanofilled composite resins at 1.79 ± 0.09, and finally the bulk-fill composites at 2.85 ± 0.11, amid the investigational groups studied. A statistically significant difference amid the three dissimilar cores buildup substances was found upon analysis of variance.
Despite the study limitations, this research came to a conclusion that each of the three investigated core build-up substances exhibited microleakage. However, amid the three, nanohybrid ormocer-based composites depicted the lowest amount of microleakage in pursuit by the nanofilled resins and the bulk-fill composites.
Core build-up is an important requirement as the remaining tooth substance following root canal treatment reduces and needs reinforcement with core build-up to sustain the tooth structure and provide resistance. A vital mandate for enduring efficiency of the restoration in the mouth is high-quality adhesive bond of these agents to cavity walls with diminished microleakage.
本研究旨在采用染料渗透技术，建立并评估在大体积充填型复合树脂、纳米复合树脂或有机硅树脂基复合材料以及纳米复合树脂核修复材料中的微渗漏。
本研究选取 60 颗无龋、单根下颌第一前磨牙，从牙釉牙骨质界（CEJ）处切除 2mm 牙体，完成根管治疗后，为所有 60 个样本制备根管内桩道。根据核修复材料的不同，将样本分为以下三组（每组 20 个样本）：I 组：大体积充填型复合树脂，II 组：纳米复合树脂或有机硅树脂基复合材料，III 组：纳米复合树脂。采用直接复合树脂进行核修复并进行光固化，然后将样本浸入 1%亚甲蓝溶液中 24 小时。采用体视显微镜（放大倍数 40×）和软件评估每个样本的染料扩散情况，并用扫描电子显微镜评估牙本质和材料基底之间的表面接触情况。
在研究的三组中，纳米复合树脂或有机硅树脂基复合材料的微渗漏最少，为 1.12±0.14；纳米复合树脂为 1.79±0.09；大体积充填型复合树脂为 2.85±0.11。方差分析显示，三种不同核修复材料之间存在统计学差异。
尽管存在研究限制，但本研究表明，三种研究中的核修复材料均存在微渗漏。然而，在三种材料中，纳米复合树脂或有机硅树脂基复合材料的微渗漏最少，其次是纳米复合树脂，大体积充填型复合树脂的微渗漏最多。
根管治疗后，由于剩余牙体减少，需要进行核修复以增强牙体结构并提供抗力，因此核修复是一项重要要求。为了确保修复体在口腔中的长期有效性，这些材料与洞壁之间的高质量粘结以及减少微渗漏至关重要。
