Bonding to Dentin Contaminated with Ceramic-Repair Primers/Etchants

Area of Science:

• Dental Materials Science
• Adhesive Dentistry
• Biomaterials

Background:

• Ceramic restorations often require adjacent repairs.
• Contamination of dentin with primers/etchants during repair can potentially affect bonding.
• Understanding the impact of such contamination on different adhesive systems is crucial for clinical success.

Purpose of the Study:

• To evaluate the effect of dentin contamination with ceramic repair primers/etchants on bonding using universal adhesive (UA) in etch-and-rinse (E&R) and self-etch (SE) modes.
• To compare the bonding performance with a gold-standard SE adhesive under similar contamination conditions.

Main Methods:

• Human molars were used, and dentin was contaminated with Monobond Etch & Prime (MEP) or IPS Ceramic Etching Gel (HF).
• Bonding was performed using Single Bond Universal (SBU) in E&R and SE modes, and Clearfil SE Bond (CSE) in SE mode.
• Microtensile bond strength was tested after 1 week and 6 months of aging in artificial saliva.

Main Results:

• Etch-and-rinse (E&R) bonding to contaminated dentin showed no significant difference compared to uncontaminated controls.
• Self-etch (SE) bonding to MEP- and HF-contaminated dentin was significantly less effective than to controls.
• Aging for 6 months did not negatively impact E&R bonding but further reduced SE bonding effectiveness.

Conclusions:

• Dentin contamination with MEP and HF significantly impairs self-etch (SE) adhesive bonding.
• Etch-and-rinse (E&R) bonding protocols are more resilient to contamination by ceramic repair agents.
• Clinical protocols should consider the potential impact of contamination on SE bonding systems.