Effect of Artificially Accelerated Ageing and Different Mouth Rinses on Color Stability of Veneered PEEK Crowns

Abstract

Statement of problem: Veneered polyether ether ketone (PEEK) is a recent alternative choice for fixed dental prostheses. There is a lack of data about the color stability of veneered CAD/CAM PEEK crowns using different veneering composite techniques. Purpose: To verify the effect of thermocycling and different mouth rinses on color stability of CAD/CAM composite versus conventional nanohybrid composite veneered PEEK crowns. Methods: Forty-two duplicated epoxy resin dies of prepared mandibular first molar to receive a ceramic crown were fabricated. 42 CAD/CAM PEEK cores were fabricated and divided into two groups (n=21) based on the veneering technique; group (C): nanohybrid crea.lign composite veneered PEEK cores (control) and group (H): HIPC veneered PEEK cores. Each group was further subdivided based on the mouth rinse into 3 groups (n=7): Listerine-alcohol free, Hexitol and Distilled Water (control). The color at baseline, after thermocycling equivalent to clinical 6 months service and 1-week immersion in mouth rinses were measured utilizing a spectrophotometer. The data were statistically analyzed using ANOVA, pair-wise Tukey's post-hoc and student t-tests to reveal the significance between groups (P ≤ 0.05). Results: All specimens showed visually unperceptible color differences after thermocycling and immersing in mouth rinses (∆E*<3.3). Based on material, C group showed statistically significant higher color change values than H group. ANOVA test revealed that the highest color change was for Hexitol followed by Listerine then Distilled Water (p=<0.0001<0.05). Tukey's post-hoc test showed a non-significant difference between Hexitol and Listerine. The interaction between the effect of mouth rinses and type of veneering composite materials was statistically non-significant for C group (P>0.05) while significant for H group (P<0.05). Conclusions: Although visually nonperceptible, HIPC or nanohybrid composite veneered PEEK crowns showed a color difference after thermocycling and immersion in different mouth rinses.

Evaluation of colour stability and surface roughness of three CAD/CAM materials (IPS e.max, Vita Enamic, and PEEK) after immersion in two beverage solutions: An in vitro study

“…Moreover, another explanation for the high stainability of Vita Enamic might be related to the effect of acids in wearing down the polymer content and leaving a rough surface of ceramic, which increased its staining liability [12,18] . The high Color change of PEEK (BioHPP) might also be due to the water absorption nature of the veneering composite material, as it is composed of BISGMA and TEGDMA, which shows high hydrophilicity [32] . This was in agreement with Hussein et al [33] and Badran et al [34] who proved the stainability of PEEK (BioHPP) layered with the crea.lign composite and they related their findings to the composite hydrophilicity.…”

“…This might be attributed to the composition of the layering composite used (crea.lign) (Bredent, Germany) as it contained 50% nano-ceramic fillers with a 40 nm filler size that enhanced its aesthetic properties and stain resistance [32] . This was in agreement with Aydin et al [35] and Ziada and Beleidi [32] who revealed that the colour stability of composite is affected by the filler type and resin matrix The results of this study were in disagreement with Acar et al [37] who compared the effect of coffee staining on IPS e.max CAD, Vita Enamic, Lava Ultimate, and nanocomposites at different thicknesses (0.5 mm, 1 mm, and 1.2 mm). They found that Vita Enamic revealed a clinically perceivable but acceptable colour change following IPS e.max CAD, while nanocomposite showed an unacceptable colour change when stained with coffee.…”

3D Surface Deviation Wear Analysis of Veneered PEEK Crowns and Its Correlation with Optical Digital Profilometry

“…Sample size calculation was performed using a statistical power analysis software (G*Power v3.1.9.2, Heinrich-Heine-Universität, Düsseldorf, Germany). 18 A typodont mandibular first molar tooth was prepared to receive an all-ceramic crown by preparing a 1 mm chamfer finishing line, 1.5 mm occlusal reduction, 1 mm axial reduction, and 6°tapering angle. 18 It was then duplicated to create 20 dental epoxy resin dies.…”

“…18 A typodont mandibular first molar tooth was prepared to receive an all-ceramic crown by preparing a 1 mm chamfer finishing line, 1.5 mm occlusal reduction, 1 mm axial reduction, and 6°tapering angle. 18 It was then duplicated to create 20 dental epoxy resin dies. 19 Each prepared die was scanned using a 3D dental scanner (Identica Hybrid T500; MEDIT corp., Seoul, Korea).…”

“…Based on the desired power of 80% and alpha (α) level of (5%), the minimum estimated sample size was 5 specimens in a group, which increased to 10 specimens. Sample size calculation was performed using a statistical power analysis software (G*Power v3.1.9.2, Heinrich–Heine–Universität, Düsseldorf, Germany) 18 …”