Effect of Artificial Saliva Aging on The Surface Properties of CAD/CAM and Heat-Compressed Molded PMMA Dentures
الكلمات المفتاحية:
Computer-Aided Design and Computer-Aided Manufacturing (CAD/CAM); Artificial Saliva Aging; Poly Methyl Methacrylate (PMMA); Surface Micro-Hardness; Surface Roughnessالملخص
This study simulates the oral environment by immersing the denture specimens in artificial saliva aging of the surface properties
- micro-hardness and surface roughness - of Poly Methyl Methacrylate (PMMA) denture bases fabricated using ComputerAided Design and Computer-Aided Manufacturing (CAD/CAM) and conventional compressed molded (CCM).
Methodology: CAD/CAM and CCM PMMA denture bases were fabricated and immersed in artificial saliva at 37ºC for a week.
Surface micro-hardness and roughness of the samples were subsequently measured. The data was analyzed statistically to draw
comparisons between the two fabrication techniques.
The CAD/CAM PMMA denture bases exhibited significantly higher surface micro-hardness (mean: 25.26) than the CCM
denture bases (mean: 18.76), suggesting enhanced abrasion resistance. Similarly, the surface roughness of CAD/CAM PMMA
was found to be within the clinically acceptable value (0.13), and significantly less than the CCM PMMA (1.61), indicating
better biofilm resistance.
Conclusion: Under one-week artificial-saliva aging at 37 ºC, CAD/CAM-milled PMMA denture base specimens showed higher
surface micro-hardness and lower surface roughness than PMMA, indicating better maintenance of surface properties under
the tested in vitro conditions.
