Color Stability and Surface Roughness of an Organically Modified Ceramic (Ormocer) and a Methacrylate Based Composite Resins (An in-Vitro Study)

Abstract

INTRODUCTION: Any esthetic restorative material largely depends on the color match and the color stability of the material in long term use. Also the smooth surface appear to be critical for composite performance and it's aesthetic outcome. However resin composites are materials that can show color changing when exposed to staining media. OBJECTIVES: The aim of this invitro study is to evaluate the color stability, change in opacity and change in surface roughness of an ORMOCER, and two methacrylate based composites after being immersed in different staining solutions with different time intervals. MATERIALS AND METHODS: A total of one hundred twenty disc specimens (10mm in diameter and 2mm in thickness) were prepared from three composite resins, A bulk fill ORMOCER based (Admira fusion X-tra) and a bulk fill methacrylate based (X-tra fill) and an incremental fill methacrylate based (Esthet-X HD) composite resins (n = 40). Specimens of each type were divided in to four groups according to immersion solutions (n = 10). Group A= Specimens were immersed in coffee (Nescafe classic, Nestle, Egypt), Group B= Specimen were immersed in tea (Lipton yellow lable, Unilever brand, Egypt), Group C = Specimen were immersed in cola (Coca cola company, Egypt) and Group D= Specimen were immersed in distilled water as a control group. Color evaluation was done at base line before staining and then at periods of 7 days, 14 days, 28 days using spectrophotometer. Change in color (∆E*) and opacity (∆Op) were obtained using the CIE L*a*b* system. Surface roughness was evaluated using Atomic Force microscopy at baseline before staining and then at 28 days from immersion in staining solutions. RESULTS: All composite used showed change in color values at the end of the time intervals after 28 days of immersion in staining solutions. Group A (coffee) was the highest effecting group (ΔE >3.3) and Admira fusion X tra was the material with the highest change in color. Surface roughness also increased especially in group C (cola) for all materials after 28 days with no statistically significant difference between groups (p>0.05). CONCLUSIONS: Coffee has a higher effect on staining composite resin than tea and cola. While cola affected the surface roughness of the composite resins used more than the other solution used.

Effect of Polishing Systems on the Color and Surface Properties of Resin Composites in the Process of Accelerated Artificial Aging

“…The staining susceptibility of resin composites may be due to the degree of water sorption and the hydrophilicity of the resin matrix. Resin composites can absorb water and are also able to absorb other fluids with pigments, which results in discoloration (23). Discoloration may be caused by inseparable highly cross-linkable organic networks and inorganic structures (20) and by AAA disrupting the ormocer structure.…”

“…Surface roughness can influence color change, as surface morphology influences susceptibility to discoloration. Surface roughness evaluation is relevant to the study of composite restoration since surface morphology affects susceptibility to discoloration (23). AAA and polishing produced rougher surfaces, which in turn caused significant color alterations.…”

“…These differences can be attributed to the different chemical compositions of the materials, especially the filler content ratio. It is well known that the smoothest obtainable surfaces are achieved by curing the material in direct contact with a Mylar strip (23). The higher filler weight and volume of Universal Restorative 200 may have resulted in smoother surfaces in the Mylar strip group.…”

Surface Roughness of Bis-GMA Free Resin Composite in Comparison With Bis-GMA Containing Resin Composite (In-vitro Study)

“…The specimens (10 mm in diameter and 2 mm in height) were made in a split Teflon mold. 3,6,7 A 1 mm glass Filler content %: 84 (W/w).…”

Preventing Color Fading in Artist’s Oil Paintings Based on Nano-PZT Ferroelectric Thin Film

“…erefore, the degree of polarization of ferroelectric materials increases as the charge increases. When the total charge exceeds the extreme point B line, due to the continuous increase of the total charge, the increase in the polarization of the crystal changes very little [25,26]. However, due to the existence of induced polarization, once the total charge continues to increase, the voltage change of the total polarization responds to the continuous increase of the BC line.…”