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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A comparative study of bulk-fill composites: degree of conversion, post-gel shrinkage and cytotoxicity

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Author(s):
Flávia Gonçalves [1] ; Luiza Mello de Paiva Campos [2] ; Ezequias Costa Rodrigues-Júnior [3] ; Fabrícia Viana Costa [4] ; Pamela Adeline Marques [5] ; Carlos Eduardo Francci [6] ; Roberto Ruggiero Braga [6] ; Letícia Cristina Cidreira Boaro [8]
Total Authors: 8
Affiliation:
[1] Universidade Ibirapuera - Brasil
[2] Univ Sao Paulo, Inst Energy & Nucl Res, Lab Polymers & Nanotechnol, Sao Paulo, SP - Brazil
[3] Universidade de São Paulo – USP. School of Dentistry. Department of Biomaterials and Oral Biology - Brasil
[4] Universidade de Santo Amaro – Unisa. School of Dentistry - Brasil
[5] Univ Santo Amaro Unisa, Sch Dent, Sao Paulo, SP - Brazil
[6] Univ Sao Paulo, Sch Dent, Dept Biomat & Oral Biol, Sao Paulo, SP - Brazil
[7] Universidade de Santo Amaro – Unisa. School of Dentistry - Brasil
Total Affiliations: 7
Document type: Journal article
Source: Brazilian Oral Research; v. 32, 2018-03-08.
Abstract

Abstract: Bulk-fill composites are claimed to be restorative materials used in deep preparations and effectively photoactivated in layers up to 4 mm. The aim of the present study was to evaluate the degree of conversion, post-gel volumetric shrinkage, and cytotoxicity of six bulk-fill and two conventional composites. Degree of conversion was determined by FTIR spectroscopy; post-gel volumetric shrinkage was determined using the strain gauge method; and cytotoxicity in human fibroblasts was evaluated indirectly by the MTT assay. Data were subjected to one-way ANOVA/Tukey's test (α = 0.05). All materials, including bulk-fill and conventional composites, were classified as non-toxic, with cell viability higher than 70%. Bulk-fill composites exhibited volumetric shrinkage similar to or lower (1.4 to 0.4%) than that of conventional composites (1.7–2.1%). However, only four of the bulk-fill composites were able to sustain a homogeneous conversion at the 4-mm depth. Despite their non-toxicity and shrinkage similar to that of conventional materials, not all commercial bulk-fill materials were able to maintain a conversion as high as 80% of the superficial layer, at the 4-mm depth, indicating some failure in the bulk-fill design of some commercial brands. Therefore, the use of bulk-fill materials in dental practice is advantageous, but special attention should be given to the selection and correct use of the materials. (AU)

FAPESP's process: 13/07229-3 - ASSESSMENT OF CLAY MINERAL NANOPARTICLE ADDITION IN BISGMA/TEGMA PHOTO-ACTIVATED POLYMERIC MATRICES FOR DENTISTRY APPLICATION
Grantee:Luiza Mello de Paiva Campos
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 16/01319-9 - Development of dental nano composites based on Bis Gma / TEGDMA with antimicrobial activity using MMT nanoparticles loaded with chlorhexidine
Grantee:Letícia Cristina Cidreira Boaro
Support Opportunities: Regular Research Grants