Surface roughness of glass-ceramic insert-composite restorations: assessing several polishing techniques

Area of Science:

• Dental Materials Science
• Restorative Dentistry

Background:

• Glass-ceramic insert-composite restorations offer aesthetic and functional benefits.
• Achieving a smooth surface finish is crucial for the longevity and performance of dental restorations.

Purpose of the Study:

• To evaluate and compare the effectiveness of seven different polishing methods on glass-ceramic insert-composite restorations.
• To identify polishing techniques that ensure surface smoothness and preserve restoration margins.

Main Methods:

• Seven distinct polishing protocols were applied to glass-ceramic insert-composite restorations fabricated on plastic resin squares.
• Methods involved combinations of carbide/diamond finishing burs, diamond polishing paste, composite resin finishing disks/points, resin-impregnated disks, and aluminum oxide paste.

Main Results:

• Most polishing systems yielded comparable surface smoothness.
• The use of carbide finishing burs alone resulted in significant damage to the insert-composite margin.
• Diamond abrasive finishing burs, with or without subsequent polishing agents, generally maintained surface integrity.

Conclusions:

• Carbide finishing burs are not recommended for polishing glass-ceramic insert-composite restorations due to margin damage.
• Various combinations of diamond burs and polishing agents can effectively achieve a smooth surface finish without compromising restoration margins.
• Proper selection of polishing instruments is critical for successful clinical outcomes in restorative dentistry.