Objectives : The aim of this study was to evaluate the microtensile bond strength of some current adhesive systems on root surface dentin after 24 h of storage in distilled water.
Materials and methods : Long flat dentin surfaces below the CEJ on fifty-four human extracted teeth were prepared with a series of sandpaper discs, and then treated with one of the adhesive systems according to the manufacturer’s instructions. Each adhesive group comprised six teeth. The adhesives were two-step etch & rinse (Optibond Solo Plus (OSP), Kerr Corp.; XP Bond (XP), Dentsply; Prime&Bond NT (PB), Dentsply; I-Bond (IB), Heraeus Kulzer), two-bottle self-etch (Clearfil SE Bond (CSE), Kuraray; FL Bond (FLB), Shofu; Scotch Bond SE (SSE), 3M Espe), and one-bottle self-etch (Clearfil Tri S Bond (CS3), Kuraray; Adper Easy Bond (AEB), 3M Espe). 3 mm high composite resin build-ups were formed on the bonding surfaces with composite resin. After storage in distilled water for 24 h, the specimens were sectioned into 1 mm thick slabs at 90-degree angles to the long axis of the teeth and hour-glass shaped specimens with an area of about 1 mm 2 at the bonded interface were prepared. The slabs were then subjected to microtensile testing. Statistic analysis was carried out with SPSS 13.0. Data of groups were analyzed using Mann–Whitney U -test.
Results : The highest bond strength values to root surface were obtained with CSE. They were, however, not significantly different from AEB, PB, FLB, and IB ( p > 0.05). The lowest bond strength values of all bonding agents were found with CS3. Premature failure percentage (30%) was quite high with SSE and CS3.
|Groups ( n = 18)||Minimum||Maximum||Mean ± SD [MPa]|
|PB||12.5||27.9||19.9 ± 5.4 abcef|
|XP||7.8||26.3||17.0 ± 5.7 ahi|
|FLB||13.0||27.1||19.6 ± 4.1 aef|
|OSP||10.7||21.3||15.6 ± 3.1 bh|
|CSE||13.1||30.1||21.7 ± 4.7 cef|
|CS3||0.0||22.2||12.7 ± 7.3 dgh|
|AEB||9.8||27.5||20.3 ± 5.7 efi|
|SSE||0.0||28.1||15.7 ± 10.9 gh|
|IB||9.8||25.4||18.5 ± 4.5 efh|