Cleaning and retreatment protocol for a debonded ceramic restoration

Area of Science:

• Dental Materials Science
• Ceramic Restorations
• Adhesive Dentistry

Background:

• Debonding of ceramic restorations necessitates effective cleaning protocols.
• Residual resin cement can compromise the bond strength of recemented restorations.
• Current retreatment methods for debonded ceramics are often invasive or incomplete.

Purpose of the Study:

• To propose and evaluate a resin cement cleaning protocol for debonded ceramic restorations.
• To determine the efficacy of thermal pyrolysis in removing resin cement.
• To facilitate conventional retreatment of ceramic surfaces before recementation.

Main Methods:

• Ceramic samples (IPS d.sign®, IPS e.max Press®) were treated with various surface preparations including hydrofluoric acid etching (HF), silane (S), and adhesive (A).
• Treated samples were subjected to thermal pyrolysis by furnace heating at 650°C for one minute to pyrolyze residual resin cement.
• Surface analysis was performed using scanning electron microscopy (SEM) to assess cleaning effectiveness.

Main Results:

• The proposed cleaning protocol, involving thermal pyrolysis, resulted in a clean ceramic surface.
• The pyrolyzed surface demonstrated adequate retentiveness for subsequent bonding.
• SEM examination confirmed the removal of composite cement after furnace treatment.

Conclusions:

• Heating debonded ceramic restorations to 650°C for one minute effectively pyrolyzes and removes composite resin cement.
• This thermal treatment allows for conventional retreatment of the ceramic surface.
• The proposed protocol simplifies the process of recementing debonded restorations, ensuring a clean and retentive surface.