J Adv Prosthodont.  2019 Aug;11(4):193-201. 10.4047/jap.2019.11.4.193.

Color alterations of a PMMA resin for fixed interim prostheses reinforced with silica nanoparticles

• Kotanidis
• Kontonasaki E
• Koidis P

• KMID: 2455927
• DOI: http://doi.org/10.4047/jap.2019.11.4.193

Abstract

PURPOSE
The aim of the present study was to evaluate the color changes of an autopolymerizing PMMA resin used for interim fixed restorations, reinforced with SiO2 nanoparticles.
MATERIALS AND METHODS
Silica nanoparticles were blended with the PMMA resin powder through high-energy ball milling. Four shades of PMMA resin were used (A3, B3, C3, D3) and total color differences were calculated through the equations ΔEab= [(ΔL*)2 + (Δa*)2 + (Δb*)2]½ andΔ E 00 = [ Δ L"² K L S L 2 +Δ C"² K C S C 2 +Δ H"² K H S H 2 + R T Δ C"² K C S C Δ H"² K H S H ] 1 / 2 . Statistically significant differences between ΔEab and the clinically acceptable values of 3.3 and 2.7 and those between ΔE00 and the clinically acceptable value of 1.8 were evaluated with one sample t-test (P<.05). Differences among the different shades were assessed through One-Way ANOVA and Bonferroni multiple comparison tests.
RESULTS
Significantly lower values were detected for all groups concerning ΔEab compared to the intraorally clinical acceptable values of 3.3 and 2.7. Significantly lower mean values were detected for groups B3, C3, and D3, concerning ΔE00 compared to the intraorally clinical acceptant value of 1.8. Color pigments in red-brown (A3) and red-grey (D3) shades affect the total color change to a greater extent after the reinforcement with SiO2 nanoparticles compared to the red-yellow (B3) shade.
CONCLUSION
Within the limitations of this in vitro study, it can be suggested that reinforcing PMMA with SiO2 nanoparticles at 0.25 wt% slightly affects the optical properties of the PMMA resin without being clinically perceivable.

Keyword

Polymethylmethacrylate resin; Silica nanoparticles; Color

MeSH Terms

In Vitro Techniques
Nanoparticles*
Polymethyl Methacrylate*
Prostheses and Implants*
Silicon Dioxide*
Polymethyl Methacrylate
Silicon Dioxide

Figure

• 

  Fig. 1 Specimens fabrication: (A) PMMA-SiO2 nanoparticles mixed powder inside the ball milling, (B) silicon mold between two glass plates, (C) mixture into the silicon mold pressed through a clamp between two glass slides, (D) the polymerized specimen, (E) specimens in distilled water prior to color measurements, (F) incubator at 37℃ (G) spectrophotometer sample holder, (H) polymerized sample fixed in the sample holder with black silicon.

• 

  Fig. 2 Mean values and standard deviations for the parameters Δa, Δb, ΔL, ΔE for each shade.

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