Initial polishing time affects gloss retention in resin composites.

Area of Science:

• Dental Materials Science
• Biomaterials Engineering

Background:

• Dental restorative materials, particularly resin-composites, are widely used.
• Maintaining the aesthetic properties, such as surface gloss, is crucial for patient satisfaction.
• Wear and degradation can affect the surface characteristics of resin-composites over time.

Purpose of the Study:

• To investigate the impact of varying finishing and polishing durations on the surface gloss of diverse resin-composite materials.
• To evaluate the gloss retention of these materials following simulated toothbrushing abrasion.

Main Methods:

• Eight distinct resin-composite types were fabricated into disc specimens.
• Specimens were polished using a two-step system for either 3 minutes (Group A) or 10 minutes (Group B).
• Surface gloss was quantified using a gloss meter before and after 16,000 cycles of simulated toothbrushing.

Main Results:

• Extended polishing (10 minutes) yielded significantly higher initial gloss values across all tested resin-composites compared to shorter polishing (3 minutes).
• The 10-minute polishing group demonstrated superior gloss retention after simulated toothbrushing.
• A general decrease in surface gloss was observed for all specimens post-brushing.

Conclusions:

• Polishing time is a critical factor influencing the surface gloss and durability of resin-composites.
• Longer polishing durations (10 minutes) are recommended for achieving and maintaining optimal surface aesthetics.
• All tested resin-composites experienced some gloss reduction after simulated wear, highlighting the importance of material selection and finishing protocols.