Goracci Cecilia, Bertelli Egidio, Ferrari Marco
Department of Dental Materials, University of Siena, Siena, Italy.
Quintessence Int. 2004 Jan;35(1):21-7.
Resin composites can be proposed for the restoration of incisal edges. If a progressive wear or an old fracture is responsible for the loss of the incisal edge, the bonding substrate is likely to be sclerotic dentin, surrounded by enamel. The purpose of the study was to measure under laboratory conditions, the shear bond strength of three adhesive systems to the enamel and dentin exposed on the edge of incisors as a result of a long-time wear or an old fracture.
Thirty extracted human incisors were selected. The teeth had to exhibit some exposed dentin on their edges, a result of old fractures or wear. The 30 specimens were randomly divided into three groups. In each group, a different adhesive system was tested for the ability to efficiently bond a resin composite restoration to the dental substrate. A three-step system (Scotchbond Multipurpose Plus), a one-bottle adhesive (Scotchbond 1), and a self-etching adhesive (Prompt-L-Pop) were compared. The shear bond strength of the restored samples was measured under a loading machine. The pattern of failure that each sample underwent as a result of loading was assessed under a stereomicroscope.
The highest values of bond strength were yielded by Scotchbond Multipurpose Plus (28.14 MPa), followed by Scotchbond 1 (16.15 MPa), and Prompt-L-Pop (9.26 MPa). These differences were statistically significant (P < .05). The most frequent pattern of failure was the combined adhesive-cohesive in resin fracture.
Adhesive systems involving phosphoric acid etching of the substrate were more dependable than a self-etch adhesive when bonding a resin composite restoration to worn or fractured incisal edges.
树脂复合材料可用于修复切缘。如果渐进性磨损或陈旧性骨折导致切缘缺失，粘结基底很可能是硬化牙本质，其周围为牙釉质。本研究的目的是在实验室条件下，测量三种粘结系统对因长期磨损或陈旧性骨折而暴露于切牙边缘的牙釉质和牙本质的剪切粘结强度。
选取30颗拔除的人类切牙。这些牙齿的边缘必须有一些暴露的牙本质，这是陈旧性骨折或磨损的结果。将30个标本随机分为三组。在每组中，测试一种不同的粘结系统将树脂复合材料修复体有效粘结到牙齿基底的能力。比较了一种三步系统（Scotchbond Multipurpose Plus）、一种单瓶粘结剂（Scotchbond 1）和一种自酸蚀粘结剂（Prompt-L-Pop）。在加载机下测量修复后样本的剪切粘结强度。在体视显微镜下评估每个样本因加载而发生的破坏模式。
Scotchbond Multipurpose Plus产生的粘结强度最高值（28.14MPa），其次是Scotchbond 1（16.15MPa）和Prompt-L-Pop（9.26MPa）。这些差异具有统计学意义（P<.05）。最常见的破坏模式是树脂断裂中的粘结-内聚联合破坏。
在将树脂复合材料修复体粘结到磨损或断裂的切缘时，涉及对基底进行磷酸酸蚀的粘结系统比自酸蚀粘结剂更可靠。
