Influence of pH-cycling and abrasion wear on the mechanical properties of conventional and bulk fill resin composites
Braz. j. oral sci
;
22: e238637, Jan.-Dec. 2023. ilus
Article
in English
| LILACS, BBO
| ID: biblio-1512222
ABSTRACT
The objective of this study was to evaluate the effect of abrasion wear on surface roughness and microhardness of different commercially available resin composites simulating pH-challenges of the oral cavity. Methods:
Three resin composites (RC) were used in this study one conventional Z250; and two bulk fill resin composites (BRC) Tetric N-Ceram (TNC) and Sonic Fill (SF). The RC was inserted in a prefabricated mold (15mm wide x 4mm thickness) in two layers, or in a single layer for BRC. Thirty samples were prepared and surface roughness (Ra) and Knoop microhardness (KHN) test were performed at three different time-points of evaluation baseline (24h after sample preparation); partial (after pH cycling); and final (after simulated toothbrushing procedure). Two samples of each group were selected after different treatments and analyzed descriptively on a scanning electron microscopy (SEM). Data from Ra and KHN were analyzed by two-way repeated-measures ANOVA and Bonferroni's post-hoc test with a significance level set at 5%.Results:
Ra increased for all groups (p<0.001), at the final time-point, Z250 and TNC groups present the highest values. Oppositely, KHN decreased for all groups (p<0.001), Z250 group showed the highest KHN values for all time-points (p<0.001). The SEM imagens showed a regular surface for samples cycled and irregular with inorganic particles exposed for samples toothbrushed.Conclusion:
pH-cycling and simulated toothbrushing affected the superficial properties (roughness and Knoop microhardness), as observed at SEM imagens, with irregular surface with inorganic particles exposureSubject(s)
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Surface Properties
/
Toothbrushing
/
Microscopy, Electron, Scanning
/
Composite Resins
Language:
English
Journal:
Braz. j. oral sci
Journal subject:
Dentistry
Year:
2023
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Federal University of Alagoas/BR
/
University of Campinas/BR
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