Rai Amulya Vittal, Naik Balaram Damodar
Department of Conservative Dentistry and Endodontics, SDM College of Dental Sciences and Hospital, A Constituent College of Sri Dharmasthala Manjunatheshwara University, Dharwad, Karnataka, India.
J Conserv Dent. 2019 Sep-Oct;22(5):470-474. doi: 10.4103/JCD.JCD_84_20. Epub 2020 Aug 4.
An ideal dental repair material should possess certain important properties such as adequate adhesive ability, insolubility, dimensional stability, biocompatibility, and bioactivity. Newer materials claiming better performance are continuously being introduced in the market to optimize the care of dental patients.
The aim of this study was to evaluate the shear bond strength of three different universal adhesives to OrthoMTA.
Sixty-four specimens of OrthoMTA measuring 4 mm internal diameter and 2 mm height were prepared and divided into two main groups. After 12 min, 32 samples were randomly selected and divided into four subgroups of eight samples each. Subgroup-I: Single Bond Universal, Subgroup-II: Prime-and-Bond NT, Subgroup-III: Palfique Universal bond, Subgroup-IV: Control. After the application of adhesives, the composite resin was applied using a cylindrical plastic matrix of 2 mm internal diameter and 2 mm height over OrthoMTA. This procedure was repeated 24 h after mixing an additional 32 samples, respectively. Shear bond strengths were measured using Universal testing machine and fractured specimen were examined under stereomicroscope. Data were statistically analyzed using a two-way ANOVA test and Tukey's multiple test.
Statistical analysis revealed that subgroup-III exhibited higher bond strength at both 12 min and 24 h time intervals. It was also observed that most of the failures occurred cohesively within OrthoMTA.
Shear bond strength was higher at 24 h than compared to 12 min. Subgroup-III exhibited higher bond strength than other subgroups.
理想的牙科修复材料应具备某些重要特性，如足够的粘结能力、不溶性、尺寸稳定性、生物相容性和生物活性。市场上不断推出声称性能更好的新型材料，以优化对牙科患者的护理。
本研究的目的是评估三种不同通用粘结剂与正颌MTA的剪切粘结强度。
制备64个内径4mm、高2mm的正颌MTA样本，并分为两个主要组。12分钟后，随机选取32个样本，再分为四个亚组，每组八个样本。亚组I：单键通用粘结剂，亚组II：预粘结和粘结NT，亚组III：帕尔菲克通用粘结剂，亚组IV：对照组。涂抹粘结剂后，使用内径2mm、高2mm的圆柱形塑料基质在正颌MTA上涂抹复合树脂。分别在混合另外32个样本24小时后重复此过程。使用万能试验机测量剪切粘结强度，并在立体显微镜下检查断裂的样本。数据使用双向方差分析和Tukey多重检验进行统计分析。
统计分析表明，亚组III在12分钟和24小时间隔时均表现出较高的粘结强度。还观察到大多数失败发生在正颌MTA内部的内聚破坏。
24小时时的剪切粘结强度高于12分钟时。亚组III表现出比其他亚组更高的粘结强度。
