Evaluating surface roughness of a polyamide denture base material in comparison with poly (methyl methacrylate)

Area of Science:

• Materials Science
• Biomaterials Engineering
• Prosthodontics

Background:

• Polyamide denture bases offer greater flexibility than traditional poly (methyl methacrylate) (PMMA).
• Adequate examination of polyamide polishability is lacking.
• Understanding surface properties is crucial for clinical acceptability.

Purpose of the Study:

• To investigate the surface roughness (Ra) and clinical acceptability of polished polyamide denture base materials.
• To compare the polishability of polyamide with PMMA using conventional techniques.
• To determine if polyamide meets accepted smoothness norms for denture bases.

Main Methods:

• Samples of polyamide and PMMA were fabricated using injection molding and heat processing, respectively.
• Surface roughness (Ra) was measured using a profilometer before and after conventional polishing.
• Two-way ANOVA was employed to analyze variations in Ra values between materials and surfaces.

Main Results:

• Polyamide surfaces became over 7 times smoother after conventional polishing.
• Processed PMMA surfaces became over 20 times smoother with the same technique.
• The final surface roughness of polished polyamide was within the accepted clinical norm of 0.2 µm Ra.

Conclusions:

• Conventional laboratory polishing techniques render polyamide denture bases clinically acceptable in terms of smoothness.
• While PMMA achieves a higher degree of smoothness, polyamide's surface roughness meets established standards.
• Polyamide presents a viable alternative for denture bases, considering its flexibility and acceptable surface finish.