Effect of Air-Polishing and Different Post-Polishing Methods on Surface Roughness of Nanofill and Microhybrid Resin Composites

Abstract

Air-abrasion is a popular prophylactic procedure to maintain oral hygiene. However, depending on the applied air-abrasive powder, it can damage the surface of the tooth and restorations, making it susceptible to plaque accumulation. The purpose of this study was to investigate the effect of 5 s and 10 s air-abrasion of calcium carbonate on surface roughness (Ra) of enamel, nanofill, and microhybrid resin-composites and the effect of post-polishing with two-step rubber- (RP) or one-step brush polisher (BP) to re-establish the surface smoothness. Surface topography was visualized by scanning-electron-microscopy. The quantitative measurement of the Ra was carried out with atomic-force-microscopy. Air-abrasion for 10 s decreased the Ra of enamel as a result of abrasion of the natural surface texture. Post-polishing with RP after 10 s air-abrasion did not change the Ra or BP; however, Ra was increased significantly by scratching the surface. Air-abrasion increased the Ra of resin composites significantly, irrespective of the application time. While RP provided a similarly smooth surface to the control in the case of microhybrid resin composite, BP increased the Ra significantly. The Ra for the control group of the nanofill-resin composite was initially high, which was further increased by air-abrasion. RP and BP re-established the initial Ra with deeper and shallower scratches after BP. Both the material and treatment type showed a large effect on Ra.

Effect of Different Surface Treatments on Repair Micro-Shear Bond Strength of An Injectable Composite

“…This may be justified by any number of reasons. Resultant surface topography in 3-D is a function of the abrasive powder type, distance, angulation, and time of exposure as well as the resin composite itself (7), (39) . In this study, it may be that air abrasion (30 µm Al 2 O 3 , at 10mm) is aggressive; especially to surfaces that have only been cured 30 minutes ago, where surface is not yet at full 24hour conversion or polymer network formation.…”

“…In this study, it may be that air abrasion (30 µm Al 2 O 3 , at 10mm) is aggressive; especially to surfaces that have only been cured 30 minutes ago, where surface is not yet at full 24hour conversion or polymer network formation. An overly irregular surface may have impeded adhesive penetration (39) , alongside altered surface energy and denuded fillers (35) . This may highlight the necessity of silanation to qualify as a repair protocol.…”

Comparative Evaluation of the Repair Bond Strength of Dental Resin Composite after Sodium Bicarbonate or Aluminum Oxide Air-Abrasion

“…Before the repair of a defective RBC restoration, it could be an option to clean the surface with one of these abrasive powders. Several studies have proved that the use of these prophylactic airborne particles can increase the surface roughness (RA) of RBC restorations by leaving large depressions on the surface [15][16][17]. Therefore, it is suggested that air polishing should be avoided on all types of RBCs [17].…”

“…Several studies have proved that the use of these prophylactic airborne particles can increase the surface roughness (RA) of RBC restorations by leaving large depressions on the surface [15][16][17]. Therefore, it is suggested that air polishing should be avoided on all types of RBCs [17]. The mean value of RA as a result of a prophylactic air-polishing can range between 0.3 and 10 µm, and depends on the type of applied powder, exposure time, pressure, and the type of the recipient RBC [17][18][19][20].…”

“…Therefore, it is suggested that air polishing should be avoided on all types of RBCs [17]. The mean value of RA as a result of a prophylactic air-polishing can range between 0.3 and 10 µm, and depends on the type of applied powder, exposure time, pressure, and the type of the recipient RBC [17][18][19][20]. However, according to our best knowledge, there is no report in the literature about the effect of sodium bicarbonate air-polishing on the microtensile bond strength (µTBS).…”