Comparison of Color Stability and Marginal Accuracy of Interim Restoration Fabricated from Two Different Autopolymerizing Acrylic Resin- An Invitro Study


  • Khaled M. Alzahrani


Aim: Aim of the present study was to comparison of color stability and marginal accuracy of interim restoration fabricated from two different autopolymerizing acrylic resins.

Materials and Methods: A mandibular right first molar typodont tooth was prepared for a full coverage crown with a 1- mm chamfer finish line and a taper of approximately 5 degrees. After preparation of mold for provisional restoration, 40 provisional crowns were totally prepared, each group had 20. Group A: Autopolymerizing bis-acrylic material, Group B: Polyvinyl-ethyl methacrylate resin. Crowns were fitted on the master die and tested for marginal adaptation using stereomicroscope at × 40 magnifications, and photographed. All interim crowns were immersed in coffee solution Color stability (ΔE) was verified by means of an ultraviolet-visible spectrophotometer at baseline and after 7 days.  

Results: The least marginal discrepancy found in the Autopolymerizing bis-acrylic material (118.12± 1.308) and Polyvinyl-ethyl methacrylate resin shows the more marginal discrepancy (169.03 ± 2.369) and there was a statistically significant difference found between the groups ( p<0.001). After immersion, Autopolymerizing bis-acrylic material interim crowns color changed from 2.46 ± 1.38 (baseline) to 1.84± 0.14 (after 7 days) and Polyvinyl-ethyl methacrylate resin material interim crowns color changed from 2.53± 1.44 (baseline) to 1.69± 0.12 (after 7 days). And there was no statistically significant difference found between the groups (p>0.001).

Conclusion: On conclusion, the autopolymerizing bis-acrylic material demonstrated improved marginal accuracy and color stability when compared to polyvinyl-ethyl methacrylate resin.