Press-On Force Effect on the Efficiency of Composite Restorations Final Polishing—Preliminary In Vitro Study

Abstract

The surface texture of dental restorations has a major influence on plaque accumulation and aesthetical appearance. The study aimed to evaluate the surface roughness of composite resins depending on the varying polishing sequences and applied forces. A total of 60 samples from two composite resins (Boston and Charisma) were polymerized using a lamp with 1200 mW/cm2 intensity and covering celluloid strip. The polishing sequence consisted of 12.6 mm OptiDisc (Kerr) – with increased disc per each subsequent step. Half of the samples were polished at 1N force, with the other half at 2N. The surface roughness examination was performed using a WYKO NT930 (Veeco) optical profilometer. The selected roughness parameters were compared by ANOVA with the significance level α = 0.05. The more complex polishing sequence affected on the composite smoothness. Higher roughness was identified in Charisma samples as compared to Boston. The specimens polished with 2N force contained a slightly rougher surface than those polished with 1N. However, these differences were not statistically significant. Despite the satisfactory visual effect obtained by polishing the composite samples, the profilometric examination revealed the roughness. Finishing is crucial for providing a smooth composite surface, allowing it to function properly in the oral environment.

Color Stability of Nanofilled and Suprananofilled Resin Composites with Different Polishing Techniques after Immersion in Coffee Solution

“…Moreover, the speed, pressure, motion used during the polishing were fixed, guided by the range of their manufacturers, to reduce the variability for all polishing protocols. (16,17) In the current study, coffee was used as a coloring solution for its common intake in daily life, which can cause yellow-brown stains on the surfaces of the resin composite restorations. (32) While the initial surface lustre and smoothness depends mainly on the filler characteristics, color stability and staining resistance after polishing are a function of hydrophobic resin monomer structure, coloring agents and adequate polymerization of the material.…”

“…(14) A rough surface induces plaque accumulation, staining and unpleasant esthetic appearance. (15)(16)(17) The smoothest resin composite surface can be obtained against polyester Mylar strip. (18,19) Nevertheless, removal of the superficial resin-rich layer is crucial as it can compromise mechanical properties, biocompatibility and increasing staining susceptibility.…”

The Effect of Different Polishing Methods on the Surface Roughness of Resin Composites (An In-Vitro Study)

“…Therefore, this could have affected the outcome that it could not surpass the OG, conforming to higher Ra values obtained with the partial three step system instead of the full system in several studies. 5,25 Moreover, the press-on force is less transmitted with the flexible SS discs as they can bend and counteract the exerted pressure, 44 whereas the OG rubber discs are stiffer and do not deflect with the same pressure, 42,45 causing more efficient polishing. Besides the dry polishing protocol, the grit of the polishing discs may also contribute to the changes in surface temperature, in fact when the disc is switched from a greater grit size to a smaller grit one, the temperature does not decrease, contrariwise the temperature rise.…”

Effects of Accelerated Aging on Color Stability and Surface Roughness of a Biomimetic Composite: An In Vitro Study

“…On the other hand, Omnichroma and Estalite Palfique LX5 are both supra-nano spherical filler composites that have been recently introduced, which have been known to produce greater color stability with a single shade. The most important step in the application of the composite restoration is the finishing and polishing phases, which help in improving aesthetics and longevity [ 20 , 21 ]. Indeed, poorly finished surfaces may present accumulation points for plaque and its detrimental effects.…”