Mohammed Rawnaq R, Rafeeq Reem A
Master Student, Department of Orthodontics, College of Dentistry, University of Baghdad, Baghdad, Iraq.
Al Najaf Health Directorate, Ministry of Health, Najaf, Iraq.
Int J Dent. 2023 Aug 3;2023:9246297. doi: 10.1155/2023/9246297. eCollection 2023.
The present study was intended to investigate the effect of different concentrations of chitosan nanoparticles mixed with an orthodontic primer on the shear bond strength and bond failure of stainless steel brackets bonded to dental enamel.
Four concentrations of chitosan nanoparticles (0%, 1%, 5%, and 10%) were prepared and mixed with Transbond™ XT primer. Forty-eight extracted maxillary first premolars were bonded under a standardized procedure with stainless steel orthodontic brackets utilizing those different concentrations (12 teeth per each group). After the bonding procedure, the specimens were stored in deionized water (37°C for 24 hr) and then thermocycling 5,000 times before shear bond testing, which was performed using a universal testing device. Bond failure sites were examined under a stereomicroscope. Scanning electron microscopy and X-ray diffraction were also performed to verify and evaluate the phase of the nanopowder.
The data were statistically analyzed using one-way analysis of variance) and Kruskal-Wallis tests, and the findings revealed statistically nonsignificant group differences regarding the shear bond strength and adhesive remnant index ( > 0.05).
Primers containing varying concentrations of chitosan nanoparticles demonstrated acceptable shear bonding strength and adhesive remnant index.
本研究旨在探讨不同浓度的壳聚糖纳米颗粒与正畸底漆混合后对粘结于牙釉质的不锈钢托槽的剪切粘结强度和粘结失败情况的影响。
制备四种浓度的壳聚糖纳米颗粒（0%、1%、5%和10%），并与Transbond™ XT底漆混合。采用标准化程序，使用这些不同浓度的材料（每组12颗牙），将48颗拔除的上颌第一前磨牙与不锈钢正畸托槽粘结。粘结完成后，将标本置于去离子水中（37°C，24小时），然后在进行剪切粘结测试前进行5000次热循环，剪切粘结测试使用通用测试装置进行。在体视显微镜下检查粘结失败部位。还进行了扫描电子显微镜和X射线衍射分析，以验证和评估纳米粉末的相。
数据采用单因素方差分析和Kruskal-Wallis检验进行统计学分析，结果显示，在剪切粘结强度和粘结剂残留指数方面，各组差异无统计学意义（P>0.05）。
含有不同浓度壳聚糖纳米颗粒的底漆表现出可接受的剪切粘结强度和粘结剂残留指数。
