Zotti Francesca, Ferrari Francesca, Paganelli Corrado, Pilati Francesca, Lanzaretti Giorgia, Arlacchi Daniele, Zerman Nicoletta
Researcher, PhD, Section of Dentistry and Maxillofacial Surgery, Department of Surgical Sciences, Pediatrics and Gynecology, University of Verona, P.le L.A. Scuro, 10, 37134 Verona, Italy.
DDS, Private Practice Verona, 37060.
J Clin Exp Dent. 2024 Jun 1;16(6):e707-e713. doi: 10.4317/jced.61608. eCollection 2024 Jun.
The aim of this study was to compare the fracture strength of two different Ribbond Fiber (Ribbond, Ribbond Inc., Seattle, WA, USA) restoration strategies in 5 mm deep standardized MOD cavities without interaxial dentin.
34 extracted human molars were randomly divided into two groups and restored as follows: Group 1 restoration with Ribbond Fiber placed at the cavity floor incorporated in Estelite Bulk-Fill Flow Universal composite (Tokuyama Dental Corporation Inc., Tokyo, Japan); Group 2 restoration with RF placed at 3 mm from the occlusal plane over a 2mm layer of Estelite Bulk-Fill Flow. The occlusal plane in both groups was restored with Ceram.x Spectra ST (Dentsply Sirona, Ballantyne Corporate Pl, Charlotte, NC, USA). The restored teeth were subjected to thermal cycling by immersing them for 30 seconds in hot water (55±2°C) followed by 30 seconds in cold water (5±2°C), for 2000 cycles.Their fracture strength was then evaluated using an Instron device. Data were analyzed with Two-sample T Test statistical test to compare fracture strength among groups. Finally, a descriptive analysis of the failure location was performed.
A statistically significant difference was found between groups 1 and 2 (<0.001) in terms of fracture strength. Group 2 exhibited a higher percentage of recoverable fractures compared to group 1. Group 1 had a mean fracture load of 833N and a SD of 248 while group 2 had a mean fracture load of 1286N and SD of 447.
RF placed at 3 mm depth from the occlusal plane, on a 2 mm layer Estelite Bulk-Fill Flow Universal composite (Tokuyama Dental Corporation Inc., Tokyo, Japan) contributes to improve fracture resistance in vital teeth without interaxial dentin and reduces the risk of non-recoverable fractures compared to when it is placed at a 5 mm depth. Ribbond fiber, composite restoration, fracture resistance, Instron machine.
本研究的目的是比较两种不同的 Ribbond 纤维（Ribbond，Ribbond 公司，美国华盛顿州西雅图）修复策略在无轴间牙本质的 5 毫米深标准化 MOD 窝洞中的抗折强度。
34 颗拔除的人类磨牙随机分为两组，修复如下：第 1 组在窝洞底部放置 Ribbond 纤维并与 Estelite Bulk-Fill Flow Universal 复合树脂（日本东京德山齿科株式会社）结合进行修复；第 2 组在距咬合面 3 毫米处、在 2 毫米厚的 Estelite Bulk-Fill Flow 复合树脂层上放置 Ribbond 纤维进行修复。两组的咬合面均用 Ceram.x Spectra ST（美国北卡罗来纳州夏洛特市登士柏西诺德公司，Ballantyne Corporate Pl）进行修复。将修复后的牙齿在热水（55±2°C）中浸泡 30 秒，然后在冷水（5±2°C）中浸泡 30 秒，进行 2000 次循环的热循环处理。然后使用 Instron 设备评估其抗折强度。采用两样本 t 检验对数据进行分析，以比较各组间的抗折强度。最后，对失败位置进行描述性分析。
第 1 组和第 2 组在抗折强度方面存在统计学显著差异（<0.001）。与第 1 组相比，第 2 组可恢复性骨折的百分比更高。第 1 组的平均抗折负荷为 833N，标准差为 248，而第 2 组的平均抗折负荷为 1286N，标准差为 447。
与放置在 5 毫米深度相比，将 Ribbond 纤维放置在距咬合面 3 毫米深度、在 2 毫米厚的 Estelite Bulk-Fill Flow Universal 复合树脂（日本东京德山齿科株式会社）层上，有助于提高无轴间牙本质活髓牙的抗折性，并降低不可恢复性骨折的风险。Ribbond 纤维、复合树脂修复、抗折性、Instron 机器。
