C因素对Ⅱ类洞修复中大块充填树脂与微混合复合树脂微拉伸粘结强度的影响——一项体外研究。

Effect of C-factor on Micro-tensile Bond Strength of Bulk fill V/S Micro-hybrid Composite in Class II Restorations - An In-Vitro Study.

作者信息

Yadav Vijay, Roongta Ruchika Nawal, Yadav Seema, Talwar Sangeeta

机构信息

Department of Conservative dentistry and Endodontics, Maulana Azad Institute of Dental Sciences, Delhi University, New Delhi, India.

出版信息

Niger Med J. 2022 Sep 11;63(2):112-120. doi: 10.60787/NMJ-63-2-92. eCollection 2022 Mar-Apr.

DOI:10.60787/NMJ-63-2-92

PMID:38803704

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11128154/

Abstract

BACKGROUND

High Configuration factor (C-factor) results into increased polymerization shrinkage causing stress at resin-dentin interface leading to failure of the restoration. The purpose of this study was to evaluate the effect of C-factor on micro-tensile bond strength (μTBS) of bulk fill composites in class-II cavities when restored in 4mm of bulk as compared to conventional composite.

METHODOLOGY

A total of 90 carious, crack free extracted human mandibular permanent molars were selected and randomly divided into 3 groups (n=30). On all samples, class II cavities (3.5X 3.5cm) were made by single operator and divided as Gp1 (2.5mm), Gp2 (4mm), and Gp3 (6mm) on the basis of depth of cavities. Sampling units of 30 in each group were further randomly subdivided into 3 subgroups (n=10 each subgroup), according to the type of composite resin systems to be used for restoration. Experimental Subgroup includes SubGp1 restored with SDR Surefil (Dentsply, caulk, USA) and SubGp2 restored with Sonic fill (kerr, orange, CA, USA), whereas SubGp3 restored with FILTEK Z250 served as control. After storage in water at 37◦C, the teeth were sectioned perpendicular to the restorative tooth interface as 1×1 mm non-trimmed rectangular micro-specimens for micro-tensile bond strength (μTBS) testing. Beams (n=30 max) from each SubGp were fixed to a metal jig and subjected to micro-tensile bond strength testing. The data collected for micro-tensile bond strength (expressed in Mpa) were statistically analysed using one way ANOVA and Tukey's post hoc test.

RESULTS

In class II cavities with high C-factor, SDR Surefil showed better μTBS than SonicFill and micro-filled composite when filled in bulk of 4mm, as compared to micro-hybrid composite filled incrementally.

CONCLUSION

There is no effect of high C-factor on μTBS of tooth restored with both SDR Surefil and Sonic Fill in class II cavities as compared to microhybrid composites.

摘要

背景

高构型因子（C因子）会导致聚合收缩增加，在树脂-牙本质界面产生应力，从而导致修复体失败。本研究的目的是评估与传统复合材料相比，C因子对Ⅱ类洞型中整体填充复合材料以4mm厚度进行修复时微拉伸粘结强度（μTBS）的影响。

方法

总共选择90颗龋坏、无裂纹的拔除人类下颌第一恒磨牙，并随机分为3组（n = 30）。在所有样本上，由单一操作人员制备Ⅱ类洞型（3.5×3.5cm），并根据洞型深度分为Gp1（2.5mm）、Gp2（4mm）和Gp3（6mm）。每组30个采样单位根据用于修复的复合树脂系统类型进一步随机细分为3个亚组（每个亚组n = 10）。实验亚组包括用SDR Surefil（美国登士柏，考克）修复的SubGp1和用Sonic fill（美国加利福尼亚州奥兰治， Kerr）修复的SubGp2，而用FILTEK Z250修复的SubGp3作为对照。在37℃水中储存后，将牙齿垂直于修复牙界面切成1×1mm未修整的矩形微样本用于微拉伸粘结强度（μTBS）测试。每个亚组的梁（最多n = 30）固定在金属夹具上并进行微拉伸粘结强度测试。使用单因素方差分析和Tukey事后检验对收集的微拉伸粘结强度数据（以MPa表示）进行统计分析。