Samimi Pouran, Nazem Reihaneh, Shirban Farinaz, Khoroushi Maryam
DDS, MS. Associated Professor, Dental Materials Research Center, Department of Operative Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
DDS, MS. Assistant Professor, Department of Operative Dentistry, Ghazvin University of Medical Sciences, Isfahan, Iran.
J Clin Exp Dent. 2018 Jun 1;10(6):e528-e536. doi: 10.4317/jced.54188. eCollection 2018 Jun.
Secondary caries, degradation of the dentin-resin interface and fracture of the restoration are the most common forms of failure. The aim of this study was to assess the interfacial fracture toughness of three different adhesive approaches and to compare their fracture toughness after surface treatment with antioxidant.
Seventy two dentin blocks with 3×4mm dimension and 3mm thickness were prepared and attached to precured 3×4×12mm composite blocks from both sides. Six adhesive groups (N=12), All-bond universal, Scotchbond universal and Clearfil SE bond with or without antioxidant treatment (Sodium Ascorbate 10% )were applied to dentin surfaces, a 160µ polyethylene paper formed the chevron in adhesive-dentin interfaces. Chevron-notched beam fracture toughness was measured following a modified ISO 24370 standard. The uniform composite-dentin-composite block was subjected to a 4-point test in universal machine. Data were analyzed by Kruskal-Wallis, Wilcoxon signed-rank and Mann-Whitney tests (α =0.05).
Different adhesive approaches yielded different significant in fracture toughness rates. A significant increase of fracture toughness was observed between adhesive groups after antioxidant surface treatment. The difference in fracture toughness between Scotchbond universal and All-bond universal were significant.
The highest value of fracture toughness was reported for Clearfil SE bond and the lowest value was found for All-bond universal. Sodium ascorbate as antioxidant surface treatment had a significant effect in increasing the fracture toughness. Chevron-notched beam fracture toughness, fracture toughness, dentin, adhesive, antioxidant.
继发龋、牙本质-树脂界面降解和修复体折断是最常见的失败形式。本研究的目的是评估三种不同粘接方法的界面断裂韧性，并比较抗氧化剂表面处理后它们的断裂韧性。
制备72个尺寸为3×4mm、厚度为3mm的牙本质块，并从两侧将其附着到预固化的3×4×12mm复合树脂块上。六个粘接组（N = 12），应用全粘接通用型、3M Scotchbond通用型和可乐丽SE粘接剂，分别进行或不进行抗氧化剂处理（10%抗坏血酸钠），在牙本质表面形成160µ聚乙烯纸V形切口。按照修改后的ISO 24370标准测量V形切口梁断裂韧性。将均匀的复合树脂-牙本质-复合树脂块在万能试验机上进行四点测试。数据采用Kruskal-Wallis检验、Wilcoxon符号秩检验和Mann-Whitney检验进行分析（α = 0.05）。
不同的粘接方法在断裂韧性率上有显著差异。抗氧化剂表面处理后，粘接组之间的断裂韧性显著增加。3M Scotchbond通用型和全粘接通用型之间的断裂韧性差异显著。
可乐丽SE粘接剂的断裂韧性值最高，全粘接通用型的断裂韧性值最低。抗坏血酸钠作为抗氧化剂表面处理对提高断裂韧性有显著效果。V形切口梁断裂韧性、断裂韧性、牙本质、粘接剂、抗氧化剂。
