Bonding to porcelain and gold.

Area of Science:

• Dental Materials Science
• Orthodontic Adhesion Technology

Background:

• Bonding orthodontic attachments to porcelain restorations presents clinical challenges.
• Evaluating methods to improve bond strength and minimize damage is crucial for successful treatment.

Purpose of the Study:

• To assess the efficacy of various resin systems and porcelain bonding agents for attaching orthodontic brackets to porcelain.
• To compare bond strengths achieved with different surface treatments and primers against conventional enamel bonding.

Main Methods:

• Edgewise brackets were bonded to 160 porcelain denture teeth using two resin systems and three bonding agents.
• Evaluated shear bond strengths with and without porcelain primers and surface roughening.
• Assessed porcelain fracture risk during debonding and surface appearance restoration.

Main Results:

• Bonding to porcelain was effective; primers yielded strengths comparable to acid-etched enamel.
• Roughening porcelain with a heavily filled resin achieved significant shear strength without a primer.
• Increased bond strength through roughening, primers, and filled resins correlated with higher fracture risk.

Conclusions:

• Clinically sufficient bond strength can be achieved with highly filled resins on intact porcelain.
• Porcelain primers enhance bond strength, with Reliance showing preference over Ormco or Fusion.
• While roughening and primers increase strength, the clinical necessity and risk of porcelain fracture must be considered.