THE PREVALENCE OF SURFACE ROUGHNESS AND STAINING IN INTERIM RESTORATIONS FABRICATED WITH DIFFERENT ACRYLIC RESINS
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Keywords
Interim restorations, Provisional crowns, Surface roughness, Staining resistance, Polymethyl methacrylate, Auto polymerizing acrylic resin
Abstract
Background: Interim (provisional) restorations must maintain acceptable surface smoothness and colour stability for function and aesthetics during the provisional period. Different acrylic resins vary in polymer chemistry and processing, which may affect surface roughness and susceptibility to staining.
Objective: To compare surface roughness and staining prevalence of interim restorations fabricated with (1) conventional heat-cured polymethyl methacrylate (PMMA), (2) auto polymerizing (chemically cured) PMMA, and (3) CAD/CAM-milled PMMA-based blocks.
Methods: A laboratory-based comparative study using standardized crown specimens (n = 20 per group) prepared from the three acrylic resin types. Baseline surface roughness (Ra, µm) was measured with a profilometer after finishing and polishing. Specimens then underwent thermocycling and a 7-day staining challenge (coffee). Post-challenge Ra and colour changes (ΔE00) were recorded. Surface topography was examined with SEM for a subset. Statistical comparisons used ANOVA (or Kruskal–Wallis as appropriate) with α = 0.05.
Results: CAD/CAM-milled specimens showed the lowest baseline Ra and the smallest mean colour change after staining; auto polymerizing PMMA had the highest Ra and most pronounced staining. Thermocycling and staining increased Ra in all groups, but increases were significantly larger in chemically cured PMMA (p < 0.05).
Conclusions: Material and processing significantly influence surface roughness and staining of provisional restorations. CAD/CAM-milled PMMA blocks may provide superior surface properties compared with conventional laboratory or chairside auto polymerizing resins.
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Dr. Hasham Khan
Assistant Professor Dental Materials, Khyber Medical University-Institute of Dental Sciences, Kohat, Pakistan.
Dr. Sanam Afridi
M.Phil. scholar Dental Materials, IBMS, KMU, Peshawar, Pakistan
Dr. Khola Aziz Uddin
M.Phil. scholar Dental Materials, IBMS, KMU, Peshawar, Pakistan
Dr. Aamir Syed
Assistant Professor Prosthodontics, Abbottabad International Dental College, Abbottabad, Pakistan
Dr. Sana Almas
Demonstrator Operative Dentistry, Shahida Islam dental college, Lodhran
Dr. Maheen Ehsan
Demonstrator Operative Dentistry, Shahida Islam dental college, Lodhran