Shear Bond Strength of Composite to Dentine with Various Adhesive Systems

Abstract: ABSTRACT  Background Different dental adhesive systems are used in modern restorative dentistry. Older adhesive systems such as etch and rinse systems of generation 4 have been extensively tested and proven reliable, newer adhesive systems such as self-etch systems of generation 7 and 8 have been developed with the aim of improving bonding performance, durability and to be less technique sensitive.  Aim This study aimed to compare the shear bond strength of universal adhesive systems from generation 7 (Futurabond DC) and Generation 8 (Scotchbond Universal, Optibond Universal) with an etch-and-rinse system from generation 4 (Optibond FL). Methods Four groups consisting of six specimens were prepared. The dentine specimens were then treated with four adhesive systems 1. Optibond FL, 2. Optibond Universal, 3. Futurabond DC and 4. Scotchbond Universal. Composite pillars were placed on the specimens and a shear bond strength test was performed. The results were analyzed with SPSS using One-way Kruskal-Wallis test (p<0.05). Results The OptiBond FL adhesive system exhibited the highest bond strength values, while the lowest values were observed in the Futurabond DC group. The results indicated significant differences in bond strength when comparing OptiBond FL to Futurabond DC and Scotchbond Universal (p<0.05). However, no significant difference was found between OptiBond FL and OptiBond Universal (p>0.05). Conclusions The three component etch-and-rinse system showed the highest median value of the systems tested. OptiBond FL and OptiBond Universal showed similar bond strength values, with the latter requiring fewer steps in clinical practice. More studies are needed for long-term durability and reliability.