The effect of sodium hypochlorite enamel pretreatment on the shear bond strength of fissure sealant using a resin‑modified glass ionomer cement and a fluoride‑releasing self‑etch resin adhesive

Abstract

Background: The relative high caries risk of pits and fissures highlights the importance of protecting
these areas. The aim is to determine the effect of sodium hypochlorite (NaOCl) on the shear bond
strength (SBS) of resin‑based pit and fissure sealant (RBPFS) material to enamel using resin‑modified
glass ionomer cement (RMGIC) and fluoride‑releasing self‑etch resin (FRSE) adhesives.
Materials and Methods: Extracted third molar teeth without carious lesions or defects were
divided into five experimental groups (n = 20). Group A: (Control group) etch (35% phosphoric acid)
for 15 s and RBPFS applied. Group B: Etch for 15 s, FRSE and RBPFS applied. Group C: Pretreated
with 5% NaOCl and similar steps to Group B. Group D: Etch for 15 s then RMGIC bonding agent
and RBPFS applied. Group E: Pretreated with 5% NaOCl and then similar steps to Group D. SBS
was determined using a universal testing machine. The tested specimens were examined under a
field‑emission scanning electron microscope.
Results: A statistically significant difference between the test groups was observed;
Group C showed the highest SBS mean value (7.52 ± 2.74 MPa) and Group D showed the
lowest (4.48 ± 1.81 MPa) (P < 0.001). Pretreatment with NaOCl increased the SBS of fissure sealant
when Riva bond LC was used (P = 0.049).
Conclusion: The use of NaOCl as pretreatment can increase the SBS of RBPFS to enamel using
RMGIC adhesive. FRSE adhesive did not show improvement in SBS values using pretreatment.
Key Words: Pit and fissure sealants, pretreatment, shear strength, sodium hypochlorite