Comparison of surface roughness of oral hard materials to the threshold surface roughness for bacterial plaque retention: A review of the literature

Surface texture and roughness of polished nanofill and nanohybrid resin composites

“…In contrast, GRA and VED -which contained glass fillers -showed slightly higher surface roughness when polished with the Heraeus or 3M polishing system; nonetheless, their mean Ra values were still well below the 0.2 µm threshold value 37) . However, when the Shofu diamond polishing system was used on GRA and VED, their surface roughness was significantly increased and SEM showed detrimental surface alteration and glass filler dislodgment, thereby explaining the significantly increased Ra values.…”

“…On the other hand, if 2D surface roughness (Ra) were above 0.2 µm, it exceeded the clinically acceptable threshold for composite resin restorations 37) . According to Bollen et al 37) , higher Ra values were accompanied by increased plaque accumulation and higher risk for dental caries and periodontal diseases.…”

“…On the other hand, if 2D surface roughness (Ra) were above 0.2 µm, it exceeded the clinically acceptable threshold for composite resin restorations 37) . According to Bollen et al 37) , higher Ra values were accompanied by increased plaque accumulation and higher risk for dental caries and periodontal diseases. At this juncture, it should also be pointed out that these data 37) conflicted with other studies which reported that there were no differences in plaque accumulation throughout the roughness (Ra) range of 0.7−1.4 µm 4,5,38) .…”

Comparative effects of denture cleansers on physical properties of polyamide and polymethyl methacrylate base polymers

“…In all the resins, the surface roughness of all samples was previously standardized by smoothing and polishing procedures. Bollen et al 25) reported that the surface roughness of acrylic resin depended on the polishing grit used. Since copolymer and conventional PMMA resins have good polishing properties, they have low initial roughness.…”

Effects of different concentrations of carbamide peroxide and bleaching periods on the roughness of dental ceramics

“…25 Thus, prolonged exposure to hydrogen peroxide through at-home bleaching treatment may potentially affect dental porcelain and may produce alterations on the porcelain's surface. 16 Moreover, an increase in surface roughness greater than the threshold of Ra = 0.2 µm may result in an increase in plaque accumulation, thereby increasing the risk of both secondary caries and periodontal inflammation 26 or affecting ceramic aesthetics by changing the ceramic texture. 16 The aim of the present study was to evaluate the effect of 10% and 16% carbamide peroxide nightguard bleaching agents on the surface roughness of dental ceramics after different time periods of bleaching treatment.…”