纤维增强对深部窝洞应用的大体积充填型复合树脂的适应性和粘结强度的影响。

Effects of fiber reinforcement on adaptation and bond strength of a bulk-fill composite in deep preparations.

机构信息

Biomimetics Biomaterials Biophotonics Biomechanics & Technology Laboratory, Department of Restorative Dentistry, University of Washington, 1959 NE Pacific Street, Seattle, WA 98195, USA; Cariology and Operative Dentistry Department, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.

Biomimetics Biomaterials Biophotonics Biomechanics & Technology Laboratory, Department of Restorative Dentistry, University of Washington, 1959 NE Pacific Street, Seattle, WA 98195, USA; School of Dentistry, University of Michigan, 1011 N University Ave, Ann Arbor, MI 48109, USA.

出版信息

Dent Mater. 2020 Apr;36(4):527-534. doi: 10.1016/j.dental.2020.01.007. Epub 2020 Feb 8.

DOI:10.1016/j.dental.2020.01.007

PMID:32044045

Abstract

OBJECTIVE

This study investigated the effect of plasma-treated leno weaved ultra-high-molecular-weight polyethylene fiber placement on gap formation and microtensile bond strength (MTBS) of a bulk-fill composite in deep cavity.

METHODS

Resin composite molds (3 mm width, 4 mm depth) were treated with Clearfil SE Bond 2 and restored with 3 techniques : (1) Surefil SDR flow (SDR) placed in bulk (BLK), (2) SDR placed in two unequal increments (INC) and (3) SDR placed after an increment of SDR placed with wetted polyethylene fiber (Ribbond Ultra) at the cavity floor (FRC). As a control, the cavities were bulk-filled with SDR and no bonding agent (n = 12). All the specimens were subjected to real-time and 3D imaging by SS-OCT (1330 nm) to calculate the total volume of gap formed (mm) at the cavity floor and between the composite increments. For MTBS, the occlusal cavities of the similar dimensions (3 × 3 × 4 mm) were prepared on extracted molars with similar composite placement techniques (BLK, INC and FRC). After 24 h 37 °C water storage, the specimens were sectioned using a diamond saw to create 0.7 × 0.7 mm beams for MTBS, and subjected to bond testing at a crosshead speed of 1 mm/min. Data for both tests was analyzed by one-way ANOVA and multiple-comparisons with Bonferroni correction (α = 0.05).

RESULTS

The gap volumes were different among the groups (p < 0.05). The largest cavity floor gaps (mm) were observed in the control group (2.00 ± 0.08); followed by BLK (0.74 ± 0.20) and INC (0.02 ± 0.01). In FRC, the cavity floor was gap-free in all specimens but some separation was observed between the two increments. MTBS values (MPa) were 13.8 ± 7.6, 31.7 ± 12.5 and 28.3 ± 8.5 for BLK, INC and FRC groups. There was no significant difference between FRC and INC and both were different from BLK (p < 0.05).

SIGNIFICANCE

Gap formation of the bulk-fill composite at cavity floor was significantly reduced with the placement of a fiber-reinforced increment at the base of the deep preparation. The fiber-reinforced increment acts as a shrinkage stress breaker and protects the bonded interface at deep dentin.

摘要

目的

本研究旨在探讨等离子体处理的莱诺编织超高分子量聚乙烯纤维放置对深部窝洞中大体积充填型复合树脂微拉伸粘结强度（MTBS）和间隙形成的影响。

方法

采用 Clearfil SE Bond 2 处理树脂复合模具（3mm 宽，4mm 深），并用 3 种技术修复：（1）Surefil SDR 流动（SDR）大块充填（BLK），（2）SDR 放置两个不等增量（INC），（3）SDR 放置在湿聚乙烯纤维（Ribbond Ultra）增量后在窝洞底部（FRC）。作为对照，窝洞用 SDR 无粘结剂（n = 12）大块充填。所有标本均采用 SS-OCT（1330nm）进行实时和 3D 成像，以计算窝洞底部和复合增量之间形成的总间隙体积（mm）。对于 MTBS，在相同尺寸（3×3×4mm）的离体磨牙上采用类似的复合放置技术（BLK、INC 和 FRC）制备咬合窝洞。在 37°C 水储存 24 小时后，使用金刚石锯将标本切割成 0.7×0.7mm 的梁，以进行 MTBS 粘结测试，以 1mm/min 的十字头速度进行粘结测试。采用单因素方差分析和 Bonferroni 校正的多重比较（α = 0.05）对两种试验的数据进行分析。

结果

各组之间的间隙体积不同（p <0.05）。对照组（2.00 ± 0.08）窝洞底部间隙最大；其次是 BLK（0.74 ± 0.20）和 INC（0.02 ± 0.01）。在 FRC 中，所有标本的窝洞底部均无间隙，但两个增量之间有一些分离。BLK、INC 和 FRC 组的 MTBS 值（MPa）分别为 13.8 ± 7.6、31.7 ± 12.5 和 28.3 ± 8.5。FRC 与 INC 之间无显著性差异，两者均与 BLK 不同（p <0.05）。