Operator variability using different polishing methods and surface geometry of a nanohybrid composite

Area of Science:

• Dental Materials Science
• Restorative Dentistry
• Surface Engineering

Background:

• Achieving a smooth surface on composite restorations is crucial for longevity and aesthetics.
• Operator variability can significantly impact the effectiveness of finishing and polishing techniques.
• Evaluating different polishing protocols is essential for optimizing clinical outcomes.

Purpose of the Study:

• To assess operator variability across various composite finishing and polishing techniques.
• To compare the efficacy of different polishing methods in achieving desired surface roughness.
• To determine if simplified polishing procedures can maintain clinical acceptability.

Main Methods:

• 120 composite restorations were prepared and roughened.
• Twelve operators used five different finishing/polishing methods involving diamond instruments, silicon carbide polishers, and specialized brushes.
• Surface roughness (Ra) was measured using a profilometer, and restorations were assessed via SEM.

Main Results:

• Methods 3 and 4 demonstrated superior polishing outcomes.
• Method 5 showed the poorest results and was highly operator-dependent.
• All methods, except method 5, achieved clinically acceptable surface roughness (Ra ≤ 0.2 μm).

Conclusions:

• Composite polishing procedures can be simplified without compromising results or increasing operator variability.
• Clinically acceptable surface polish is achievable with fewer steps and varied instruments.
• Selecting appropriate polishing methods is key to minimizing operator-dependent variations.