IADR Abstract Archives
Evaluation of the Optical Properties of PEKK Based Restorations
Objectives: To evaluate the spectral reflectance and color of a Poly-Ether- Ketone-Ketone (PEKK) based thermoplastic polymer (Pekkton®) as a material used for fabricating indirect restorations when veneered with light cured composite in comparison with equivalent zirconia-composite and zirconia-porcelain systems to assess the effect of different substructure materials on the same veneering material.
Methods: A spectrophotometer (CM-2600d Konica Minolta Sensing, Inc., Japan) was used to determine the spectral reflectance of each material over white and black backgrounds using a D65 illuminant. CIE L*a*b* color coordinates and color difference (ΔE) were determined from the reflectance data.
Samples of substructure materials Pekkton® Ivory (Cendres+Métaux SA) and In-Ceram® YZ (Vita Zahnfabrik, H. Rauter GmbH & Co. KG) and veneering materials VMLC and VM9 (Vita Zahnfabrik, H. Rauter GmbH & Co. KG) were produced (n=3) at 1.0mm thickness as single layered samples. Bi-layer samples (n=3) were produced using veneering and substructure materials of equivalent shade to 1.3mm thick (clinical recommendation 0.8mm for substructure and 0.5mm for the veneer).
Each group consisted of three samples (n=3) wide enough to cover the spectrophotometer’s target mask opening of 3mm. All specimens were polished under running water using waterproof SiC abrasive paper P400 and P800 respectively in a rotating disc polisher (Metaserv Buehler, UK).
Results: The Spectral Reflectance data curve of the laminate samples under white background can be visualized in figure 1. Also table 1 showes the CIE L*a*b* values of the laminate samples under black and white background.
Conclusions: Having a different substructure material did not cause any significant difference in optical properties between both PEKK-composite and zirconia-composite groups.
Methods: A spectrophotometer (CM-2600d Konica Minolta Sensing, Inc., Japan) was used to determine the spectral reflectance of each material over white and black backgrounds using a D65 illuminant. CIE L*a*b* color coordinates and color difference (ΔE) were determined from the reflectance data.
Samples of substructure materials Pekkton® Ivory (Cendres+Métaux SA) and In-Ceram® YZ (Vita Zahnfabrik, H. Rauter GmbH & Co. KG) and veneering materials VMLC and VM9 (Vita Zahnfabrik, H. Rauter GmbH & Co. KG) were produced (n=3) at 1.0mm thickness as single layered samples. Bi-layer samples (n=3) were produced using veneering and substructure materials of equivalent shade to 1.3mm thick (clinical recommendation 0.8mm for substructure and 0.5mm for the veneer).
Each group consisted of three samples (n=3) wide enough to cover the spectrophotometer’s target mask opening of 3mm. All specimens were polished under running water using waterproof SiC abrasive paper P400 and P800 respectively in a rotating disc polisher (Metaserv Buehler, UK).
Results: The Spectral Reflectance data curve of the laminate samples under white background can be visualized in figure 1. Also table 1 showes the CIE L*a*b* values of the laminate samples under black and white background.
Conclusions: Having a different substructure material did not cause any significant difference in optical properties between both PEKK-composite and zirconia-composite groups.
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