Physical and photoelastic properties of bulk-fill and conventional composites

Author(s)

Pereira, Renata ^[1] ; Caldas Giorgi, Maria Cecilia ^[2] ; Esteves Lins, Rodrigo Barros ^[1] ; Theobaldo, Essica Dias ^[1] ; Nunes Leite Lima, Debora Alves ^[1] ; Marchi, Giselle Maria ^[1] ; Baggio Aguiar, Flavio Henrique ^[1]

Affiliation

^[1] Univ Estadual Campinas, Dept Restorat Dent, Piracicaba Dent Sch, 901 Ave Limeira, POB 52, BR-13414903 Piracicaba, SP - Brazil

^[2] State Univ Amazonas, Sch Hlth Sci, Dept Operat Dent, BR-69065001 Manaus, Amazonas - Brazil

• Document type: Journal article
• Source: CLINICAL COSMETIC AND INVESTIGATIONAL DENTISTRY; v. 10, p. 287-296, 2018.
• Web of Science Citations: 1

Abstract

Purpose: This study evaluated the influence of thickness increment on degree of conversion (DC), Knoop microhardness (KHN), and polymerization-shrinkage stress (PSS) by photoelasticity of three dental composites. Methods: For DC and KHN, 45 samples were prepared and divided into nine groups (n=5), according to composite (microhybrid {[}Filtek Z250 - Z250], bulk-fill flowable {[}SureFil SDR Flow - SDR], and nanohybrid composite {[}N' Durance-NDU]) and increment thickness (1, 1.5, and 3 mm). PSS was measured by photoelastic analysis. Composites were placed into a photo-elastic model cavity and light-cured. DC and KHN data were subjected to two-way ANOVA and Bonferroni post hoc test. PSS results were qualitatively evaluated through Kruskal-Wallis test. Results: SDR showed the highest DC values. At top and bottom surfaces, the highest KHN was obtained by Z250. Z250 showed higher PSS than SDR in 1.5 mm increments. NDU showed higher PSS than SDR in 3 mm increments. Conclusion: The bulk-fill composite demonstrated better DC and similar KHN and PSS in deeper layers compared to conventional composites. Bulk-fill composites may perform as well as conventional nanohybrid and microhybrid composites. (AU)

• FAPESP's process: 14/02707-7 - Influence of increment thickness in physical and photoelastic properties of dental composites with different organic compositions
• Grantee: Renata Pereira
• Support Opportunities: Scholarships in Brazil - Scientific Initiation