这项研究的目的是研究不同牙髓切除术技术对乳牙牙本质的变化,并评估这些牙髓切除术方法对修复材料对乳牙牙本质的剪切粘结强度的影响。将240个牙本质标本随机分配给研究组;对照,硫酸铁,Biodentine®,Nd:YAG激光器,光生物调节,和大气压冷等离子体(APCP)。应用牙髓切除方法后,再次将样品随机分为两种修复材料(玻璃混合和复合树脂)(n=20),并进行剪切粘结强度(SBS)测试。然后,为所有组制备12个新的牙本质样本用于表面分析。用扫描电子显微镜(SEM)进行表面检查(n=12)和断裂分析(n=240)。对于所有数据,统计学显著性范围被接受为α<.05。对于玻璃杂化材料以及复合材料,在所有研究组之间获得统计学上显著的差异(p<.05)。虽然用Nd:YAG激光器获得了最高的平均SBS值(7.58±0.60MPa),对于玻璃杂化材料,Biodentine®观察到最低值(6.70±0.91MPa;p=.001)。对于复合材料,计算出Nd:YAG激光器的最高平均SBS值(13.79±1.24MPa),而最低值是硫酸铁(10.17±1.45MPa;p=.001)。根据SEM分析,断裂模式主要为粘合型和混合型。此外,用SEM观察硫酸铁牙本质表面的形态变化,Biodentine®和Nd:YAG激光。在这项研究的局限性内,Nd:YAG激光提高了复合树脂组的剪切粘结强度值。研究重点:在本文中,我们报告了两种修复材料的剪切粘结强度测试的结果(玻璃混合与复合树脂)应用五种不同的牙髓切除术技术(硫酸铁,Biodentine®,Nd:YAG激光器,光生物调节,和大气压冷等离子体)被报道。本文将为文献做出贡献,即关于玻璃混合物与原发性牙本质的结合强度以及牙髓切除术中的大气压冷等离子体的研究相当有限。在这项研究中,SEM检查分两个阶段进行;经过处理的牙本质表面和经过剪切粘结强度测试的样品表面的形态变化。
The aim of this study was to investigate the changes of different pulpotomy techniques on the primary tooth dentin and to evaluate the effects of these pulpotomy methods on the shear bond strength of restorative materials to primary tooth dentin. Two hundred and forty dentin specimens were distributed randomly to the study groups as; control, ferric sulphate, Biodentine® , Nd:YAG laser, photobiomodulation, and atmospheric pressure cold plasma (APCP). After the application of pulpotomy methods, samples were again randomly divided to two restorative materials (glass hybrid and composite resin) (n = 20) and shear bond strength (SBS) test was performed. Then, 12 new dentin specimens were prepared for all groups for surface analysis. Surface examination (n = 12) and fracture analyses (n = 240) were carried out with scanning electron microscope (SEM). Statistical significance range was accepted as α <.05 for all data. A statistically significant difference was obtained among all study groups for glass hybrid material as well as composite material (p <.05). While the highest mean SBS value was obtained with Nd:YAG laser (7.58 ± 0.60 MPa), the lowest value was observed with Biodentine® (6.70 ± 0.91 MPa; p = .001) for glass hybrid material. For composite material, the highest mean SBS value was calculated for Nd:YAG laser (13.79 ± 1.24 MPa), while the lowest value was obtained with ferric sulphate (10.17 ± 1.45 MPa; p = .001). Fracture modes were mainly adhesive and mixed type according to SEM analysis. Moreover, morphological changes were observed with SEM on the dentin surfaces of ferric sulphate, Biodentine® and Nd:YAG laser. Within the limitations of this study, Nd:YAG laser increased the shear bond strength values in groups of composite resin. RESEARCH HIGHLIGHTS: In this article, we report the results of the shear bonding strength test of two restorative materials (glass-hybrid vs. composite resin) to primary tooth dentin following the application of five different pulpotomy techniques (ferric sulfate, Biodentine® , Nd:YAG laser, photobiomodulation, and atmospheric pressure cold plasma) were reported. This article will contribute to the literature that there are considerably limited researches concerning the bond strength of glass hybrid to primary dentin and also atmospheric pressure cold plasma in pulpotomies. The SEM examination was performed in two stages in this study; the morphological changes in both treated dentin surfaces and the surfaces of the samples subjected to the shear bond strength test.