Garoushi Sufyan K, Lassila Lippo V J, Vallittu Pekka K
Department of Prosthetic Dentistry & Biomaterials Science, Institute of Dentistry, University of Turku, Turku, Finland.
Acta Odontol Scand. 2006 Oct;64(5):281-5. doi: 10.1080/00016350600700067.
To determine the static load-bearing capacity of composite resin onlay restorations made of particulate filler composite (PFC) with two different types of fiber-reinforced composite (FRC) substructures.
Specimens were prepared to simulate an onlay restoration, composed of a 2 to 3 mm FRC layer as the substructure (short random and continuous bidirectional fiber orientation) and a 1 mm surface layer of PFC. Control specimens were prepared from plain PFC. The specimens were incrementally polymerized with a hand-light curing unit for 40 s and then post-cured in a light-curing oven for 15 min. The specimens were cemented on dentin substrate of extracted human molars using a standard adhesive resin cementation technique. The specimens (n=8/group) were water stored either for 24 h at room temperature or for 4 weeks at 37 degrees C before they were statically loaded until fracture using a universal testing machine. Failure modes were visually examined.
ANOVA revealed that all specimens with FRC substructures had higher values of static load-bearing capacity than those obtained with plain PFC (p<0.001). The load-bearing capacity of all the specimens decreased after water storage (p<0.001).
Restorations made from a combination of FRC and PFC showed better load-bearing capacity than those obtained with PFC alone.
确定由颗粒填料复合材料（PFC）与两种不同类型的纤维增强复合材料（FRC）子结构制成的复合树脂高嵌体修复体的静态承载能力。
制备模拟高嵌体修复体的标本，由2至3毫米的FRC层作为子结构（短随机和连续双向纤维取向）和1毫米的PFC表面层组成。对照标本由普通PFC制备。标本用手持式光固化装置逐步聚合40秒，然后在光固化炉中后固化15分钟。使用标准粘结树脂粘结技术将标本粘结在拔除的人类磨牙的牙本质基质上。标本（每组n = 8）在室温下储存24小时或在37℃下储存4周，然后使用万能试验机进行静态加载直至断裂。目视检查失效模式。
方差分析显示，所有具有FRC子结构的标本的静态承载能力值均高于普通PFC标本（p < 0.001）。所有标本在水储存后承载能力下降（p < 0.001）。
由FRC和PFC组合制成的修复体显示出比单独使用PFC更好的承载能力。
