Philip Princy Maria, Sindhu J, Poornima M, Naveen D N, Nirupama D N, Nainan Mohan Thomas
Department of Conservative Dentistry and Endodontics, Vydehi Institute of Dental Sciences and Research Centre, Bengaluru, Karnataka, India.
J Conserv Dent. 2021 Jan-Feb;24(1):83-87. doi: 10.4103/JCD.JCD_426_20. Epub 2021 Jul 5.
The aim of this study was to compare the effects of herbal irrigants with conventional irrigants on microhardness and flexural strength of root dentin.
Sixty extracted permanent maxillary canines were selected. Decoronated roots were sectioned longitudinally into buccal and lingual segments to get 120 specimens. These were embedded in auto polymerizing acrylic resin and further grounded with fine emery papers under distilled water. Of these, 100 root segments without any defects were selected, further divided into four test groups and a control group according to the irrigants used ( = 20). Group 1: 2.5% Sodium hypochlorite, Group 2: Miswak stick extract, Group 3: Cashew leaves extract. Group 4: Mango leaves extract and Group 5: Normal saline (control). All specimens were treated with 5 ml of each irrigant for 10 minutes and rinsed immediately. Dentin microhardness was measured with a Vickers indenter, and the flexural strength test was done using a universal testing machine. The data were analyzed using one-way ANOVA and the intergroup comparison by student -test.
The experimental groups showed a significant reduction in microhardness values when compared with the control group. Intragroup comparison among experimental groups, herbal irrigants showed the least reduction in microhardness values at cervical, middle, and apical thirds. When compared to the control group, the flexural strength values decreased significantly with experimental groups.
Within the limitation of this study, it was concluded that herbal irrigants were least detrimental to root dentin microhardness when compared with conventional irrigant. But the flexural strength was equally reduced by both conventional and herbal irrigants.
本研究旨在比较草药冲洗剂与传统冲洗剂对牙根牙本质显微硬度和抗弯强度的影响。
选取60颗拔除的上颌恒尖牙。将去冠后的牙根纵向切成颊侧和舌侧部分，得到120个标本。将这些标本嵌入自凝丙烯酸树脂中，并在蒸馏水下用细砂纸进一步打磨。其中，选取100个无任何缺陷的牙根段，根据所用冲洗剂分为四个试验组和一个对照组（每组 = 20）。第1组：2.5%次氯酸钠，第2组：牙刷草提取物，第3组：腰果叶提取物，第4组：芒果叶提取物，第5组：生理盐水（对照组）。所有标本用5毫升每种冲洗剂处理10分钟，然后立即冲洗。用维氏压头测量牙本质显微硬度，并用万能试验机进行抗弯强度测试。数据采用单因素方差分析进行分析，组间比较采用学生t检验。
与对照组相比，试验组的显微硬度值显著降低。在试验组的组内比较中，草药冲洗剂在颈部、中部和根尖三分之一处的显微硬度值降低最少。与对照组相比，试验组的抗弯强度值显著降低。
在本研究的局限性内，得出的结论是，与传统冲洗剂相比，草药冲洗剂对牙根牙本质显微硬度的损害最小。但传统冲洗剂和草药冲洗剂均同样降低了抗弯强度。
