There is no in vitro evidence to support the choice for nanofill or su bmi cron composites over traditional microhybrids based on better surface smoothness and /or gloss , or based upon maintenance of those superficial characteristics after surface challenges
OBJECTIVES Despite nanofill and su bmi cron composites ' aim to provide high initial polishing combined with superior smoothness and gloss retention , the question still remains whether clinicians should consider using these new material s over traditional microhybrids .
The aim of this paper was to systematic ally review the literature on how nanofills and su bmi crons react to polishing procedures and surface challenges in vitro compared with microhybrids .
The paper has also given an overview of the compositional characteristics of all resin composites and polishing systems whose performance was presented herein .
SURFACE DEGRADATION OF COMPOSITE RESINS BY ACIDIC MEDICINES AND pH-CYCLING
This study evaluated the effects of acidic medicines ( Dimetapp ® and Claritin ® ) , under pH-cycling conditions , on the surface degradation of four composite resins ( microhybrid : TPH , Concept , Opallis and Nanofilled : Supreme ) . Thirty disc-shaped specimens ( Ø = 5.0 mm / thickness = 2.0 mm ) of each composite were r and omly assigned to 3 groups ( n = 10 ) : a control and two experimental groups , according to the acidic medicines evaluated . The specimens were finished and polished with aluminum oxide discs , and the surface roughness was measured by using a profilometer . After the specimens were su bmi tted to a pH-cycling regimen and immersion in acidic medicines for 12 days , the surface roughness was measured again . Two specimens for each material and group were analyzed by scanning electron microscopy ( SEM ) before and after pH-cycling . Data were analyzed by the Student's-t test , ANOVA , Duncan 's multiple range test and paired t-test ( α=0.05 ) . Significant increase in roughness was found only for TPH in the control group and TPH and Supreme immersed in Claritin ® ( p<0.05 ) . SEM analyses showed that the 4 composite resins underwent erosion and surface degradation after being subjected to the experimental conditions . In conclusion , although the roughness was slightly affected , the pH-cycling and acidic medicines caused surface degradation of the composite resins evaluated . Titratable acidity seemed to play a more crucial role on surface degradation of composite resins than
There is no in vitro evidence to support the choice for nanofill or su bmi cron composites over traditional microhybrids based on better surface smoothness and /or gloss , or based upon maintenance of those superficial characteristics after surface challenges
OBJECTIVES Despite nanofill and su bmi cron composites ' aim to provide high initial polishing combined with superior smoothness and gloss retention , the question still remains whether clinicians should consider using these new material s over traditional microhybrids .
The aim of this paper was to systematic ally review the literature on how nanofills and su bmi crons react to polishing procedures and surface challenges in vitro compared with microhybrids .
The paper has also given an overview of the compositional characteristics of all resin composites and polishing systems whose performance was presented herein .