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 |
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