Author/Authors :
Davalloo, Reza Dept. of Restorative Dentistry - Dental Sciences Research Center - Faculty of Dentistry - Guilan University of Medical Sciences, Rasht, Iran , Tavangar, Maryam Dept. of Restorative Dentistry - Dental Sciences Research Center - Faculty of Dentistry - Guilan University of Medical Sciences, Rasht, Iran , Ebrahimi, Heshmatollah Dept. of Medicinal Chemistry - School of Pharmacy - Guilan University of Medical Sciences, Rasht, Iran , Darabi, Farideh Dept. of Restorative Dentistry - Dental Sciences Research Center - Faculty of Dentistry - Guilan University of Medical Sciences, Rasht, Iran , Mahmoudi, Shima Faculty of Dentistry - Guilan University of Medical Sciences, Rasht, Iran
Abstract :
Statement of the Problem: Etching process on dentin can activate matrix metalloproteinase (MMP) which hydrolyze organic matrix of demineralized dentin. Gluma and chlorhexidine could inhibit the activation of MMP.
Purpose: The aim of the study was to evaluate the effect of a new desensitizing material
consisting of Gluma and chlorhexidine together on the shear bond strength and bond durability of composite restorations.
Materials and Method: One hundred and twenty caries-free extracted premolars were
sectioned horizontally from one third of the coronal crown to expose flat dentin surface and
randomly divided into 4 groups. In the control group, no surface treatment was used. In the
first group chlorhexidine (CHX) 2%, in the second group, new material (NM) and in third
group Gluma desensitizer (GD) was applied after etching and before bonding(total-etch
bonding system). After the bonding process, the composite was placed on the surface of the
samples using a cylindrical mold. Then, the shear bond strengths of half of the specimens
were measured after 24 hours and the other half after 6 months of storage in distilled water
and thermocycling. The failure types of specimens were evaluated with a stereomicroscope.
Data were analyzed using One-way Anova and Tukey's Post Hoc tests in SPSS software.
Results: After 6 months, the bond strength decreased in all groups and differences were
statistically significant (p= 0.002).The highest shear bond strength was observed after 6
months in the NM group and the GD group with no statistically significant difference. The
24-hour bond strengths were not significant between groups. Mix failure had the highest
rate in all groups.
Conclusion: It can be concluded that the effect of combination of chlorhexidine and Gluma
on maintaining the integrity and strength of bond over time is similar to Gluma compound
alone and they have better effect than chlorhexidine.
