Pre-treating dentin with chlorhexadine and CPP-ACP: self-etching and universal adhesive systems

Area of Science:

• Dental Materials Science
• Adhesive Dentistry
• Biomaterials

Background:

• Dentin pretreatment influences the longevity of adhesive restorations.
• Chlorhexidine and remineralizing agents like MI Paste are used to improve dentin bonding.
• Understanding pretreatment effects on bond strength is crucial for clinical success.

Purpose of the Study:

• To compare the effects of chlorhexidine (0.2% and 2%) and MI Paste pretreatment on dentin bond strength.
• To evaluate the bond strength of two different adhesive systems (Scotchbond Universal Adhesive and Clearfil SE Bond) after pretreatment.
• To determine if pretreatment methods impact the immediate bond strength of adhesive systems to dentin.

Main Methods:

• 80 bovine dentin slides were pretreated with 0.2% chlorhexidine, 2% chlorhexidine, or MI Paste.
• Control groups received no pretreatment.
• Scotchbond Universal Adhesive and Clearfil SE Bond were applied, followed by composite resin restoration.
• Push-out bond strength was tested after 24 hours.

Main Results:

• No significant difference in intra-adhesive bond strength was found among the different dentin pretreatment techniques.
• A difference in bond strength was noted between MI Paste and 0.2% chlorhexidine pretreatment when using Scotchbond Universal Adhesive (15.22 MPa vs. 20.25 MPa).
• Differences in bond strength were primarily attributed to the adhesive systems themselves, not the pretreatment methods.

Conclusions:

• Pretreatment of dentin with chlorhexidine or MI Paste does not alter immediate bond strength.
• The choice of adhesive system plays a more significant role in determining bond strength than the tested pretreatment methods.
• Further research may explore long-term effects and different restorative materials.