Evaluation of the bonding ability of a nano-structured adhesive system

The most significant advantage of self-etching primers is to simplify bonding procedures and reduce technique sensitivity.

Aims

The aim of this study is to evaluate the shear bond strength (SBS) of self-etch primers, such as polyhedral oligomeric silsesquioxanes (POSS) and silica filled adhesive systems and to assess the nano-leakage (NL) at the resin–dentin interface with field-emission scanning electron microscope (FE-SEM) before and after aging.

Methods

One light cured nano-hybrid composite resin and two self-etch primer adhesive systems (Nano-bond and AdheSE) have been used. Sixty extracted sound human molars were prepared for SBS: two self-etch primer adhesive systems (Nano-bond and AdheSE) have been used for bonding a light cured nano-hybrid composite resin. The test was performed at a universal testing machine and twelve were prepared for evaluation of NL at the interface with FE-SEM before and after aging. Data were statistically analyzed using multiple ANOVA and post hoc Scheffe test (p < 0.05).

Results

Nano-bond showed higher significant SBS values compared to AdheSE groups in the testing groups. Mean while a significant reduction in SBS was observed in each of the tested adhesive systems, after aging, where the highest was recorded by the control, followed by the thermal cycling and finally by the thermal cycling and water storage. The representative micrographs revealed more pronounced NL pattern in the specimens of AdheSE groups when compared to those of Nano-bond.

Conclusions

Within the limitation of this laboratory study, the following conclusions could be drawn:

• 1.

  The incorporation of the POSS molecules in the dentin adhesive improves its bonding strength.

• 2.

  Chemical formulation of the dental adhesive influences its bonding efficiency.

• 3.

  Nano-structured adhesive system shows better resistance to nano-leakage.