Oral and Dental Disease Research Center, Department of Operative Dentistry, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Department of Pediatric Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
J Prosthodont. 2019 Jan;28(1):e304-e309. doi: 10.1111/jopr.12743. Epub 2018 Jan 11.
To see whether applying four different liners under short fiber-reinforced composite (SFRC), everX Posterior, compared to conventional composite resin, Z250, affected their strengthening property in premolar MOD cavities.
Mesio-occluso-distal (MOD) cavities were prepared in 120 sound maxillary premolars divided into 10 groups (n = 12) in terms of two composite resin types and 4 liners or no liner. For each composite resin, in 5 groups no liner, resin-modified glass ionomer (RMGI), conventional flowable composite (COFL), self-adhesive flowable composite resin (SAFL), and self-adhesive resin cement (SARC) were applied prior to restoring incrementally. After water storage and thermocycling, static fracture resistance was tested. Data (in Newtons) were analyzed using two-way ANOVA (α = 0.05).
Fracture resistance was significantly affected by composite resin type (p = 0.02), but not by the liner (p > 0.05). The interaction of the two factors was not statistically significant (p > 0.05). SFRC exhibited higher fracture strength (1470 ± 200 N) compared to conventional composite resin (1350 ± 290), irrespective of the application of liners. Application of SARC and SAFL liners led to a higher number of restorable fractures for both composite resins.
The four liners can be used without interfering with the higher efficacy of SFRC, compared to conventional composite resins, to improve the fracture strength of premolar MOD cavities.
观察在短纤维增强复合树脂（SFRC）everX Posterior 下应用四种不同衬垫材料（liner）与传统复合树脂 Z250 相比，是否会影响前磨牙 MOD 腔的增强性能。
将 120 颗健康的上颌前磨牙随机分为 10 组（n=12），根据两种复合树脂类型和 4 种衬垫材料或无衬垫材料进行分组。对于每种复合树脂，在 5 组中分别应用无衬垫材料、树脂改良型玻璃离子水门汀（RMGI）、传统流动复合树脂（COFL）、自酸蚀流动复合树脂（SAFL）和自酸蚀树脂粘结剂（SARC），并逐步进行修复。水储存和热循环后，测试静态断裂阻力。数据（以牛顿为单位）采用双因素方差分析（α=0.05）进行分析。
断裂阻力显著受复合树脂类型的影响（p=0.02），但不受衬垫材料的影响（p＞0.05）。两个因素之间的相互作用没有统计学意义（p＞0.05）。SFRC 表现出比传统复合树脂更高的断裂强度（1470±200N），无论是否应用衬垫材料。应用 SARC 和 SAFL 衬垫材料可提高两种复合树脂的可修复性断裂的数量。
与传统复合树脂相比，这四种衬垫材料在不影响 SFRC 更高疗效的情况下，可以用于前磨牙 MOD 腔，以提高其断裂强度。
