Abstract
BackgroundThe aim of this study was to evaluate the effect of chlorhexidine digluconate incorporation on the degree of conversion of an experimental adhesive resin.Material and MethodsThe experimental resin was prepared from 70 wt% bisphenol A glycerolate dimethacrylate, 30 wt% hydroxyethyl methacrylate, silanized SiO2 nanofillers, 0.5% of camphorquinone and ethyl 4-dimethylaminebenzoate (binary photo-initiator system). Five chlorhexidine digluconate concentrations (0, 0.5, 1, 2 and 4 wt%) were then incorporated into the experimental resin. Thirty Potassium Bromide pellets were prepared then divided into six groups (n=5/group), repre¬senting the tested adhesive resins (Single Bond 2, 0, 0.5, 1, 2 and 4 wt% chlohexidine-incorporated experimental adhesive resins), that were applied to the pellets without light-curing (uncured specimens). Another 30 pellets were prepared and treated with the previous materials then light-cured using LED light-curing device (cured specimens). Degree of conversion of the uncured and the cured specimens were evaluated using FTIR analysis.ResultsAdper Single Bond 2 showed the highest degree of conversion mean values followed by 0.5 wt% chlorhexidine concentration then 2 wt% followed by 4 wt% then 1 wt% concentrations, while 0 wt% concentration showed the lowest mean values.ConclusionsChlorhexidine digluconate had slight significant influence on the efficiency of polymerization of the experimental adhesive resin. Key words:Chlorhexidine digluconate, different concentrations, degree of conversion, experimental adhesive resin.
Highlights
Dentin bonding agents are intermediate materials that endorse adhesion between the resin composite materials and the tooth
matrix metalloproteinase enzymes (MMPs) have the capability to hydrolyze the exposed collagen fibrils located at the bottom of the hybrid layer due to failure of the adhesive resin to infiltrate to the full depth of the partially demineralizd dentin leading to reduced bond strength as well as reduced bond durability [5]
Some studies showed that applying CHX disinfectants directly on etched dentin surfaces would be a better alternative than applying it on the unetched dentin surfaces that are covered with smear layer [7]
Summary
Dentin bonding agents are intermediate materials that endorse adhesion between the resin composite materials and the tooth. Many manufacturers recommend the use of different disinfectants prior to etch-and-rinse adhesives applications [6] This might be attributed to the acid etching step which is responsible for the removal of the smear layer formed on the cut dentin surface during cavity preparation. This study was undertaken to evaluate the degree of conversion of a nano-filled methacrylate-based experimental adhesive resin after incorporation of CHX digluconate in five different concentrations. The aim of this study was to evaluate the effect of chlorhexidine digluconate incorporation on the degree of conversion of an experimental adhesive resin. Thirty Potassium Bromide pellets were prepared divided into six groups (n=5/group), representing the tested adhesive resins (Single Bond 2, 0, 0.5, 1, 2 and 4 wt% chlohexidine-incorporated experimental adhesive resins), that were applied to the pellets without light-curing (uncured specimens). Conclusions: Chlorhexidine digluconate had slight significant influence on the efficiency of polymerization of the experimental adhesive resin
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