Biomechanical behaviour of bulk-fill resin composites in class II restorations

Rodrigo Barros Esteves Lins; Stenio Aristilde; Jonas H Osório; Cristiano M B Cordeiro; Cristiane Rumi Fujiwara Yanikian; Aline Arêdes Bicalho; Thiago Henrique Scarabello Stape; Carlos José Soares; Luís Roberto Marcondes Martins

doi:10.1016/j.jmbbm.2019.06.032

Biomechanical behaviour of bulk-fill resin composites in class II restorations

J Mech Behav Biomed Mater. 2019 Oct:98:255-261. doi: 10.1016/j.jmbbm.2019.06.032. Epub 2019 Jul 2.

Authors

Rodrigo Barros Esteves Lins¹, Stenio Aristilde², Jonas H Osório³, Cristiano M B Cordeiro⁴, Cristiane Rumi Fujiwara Yanikian⁵, Aline Arêdes Bicalho⁶, Thiago Henrique Scarabello Stape⁷, Carlos José Soares⁸, Luís Roberto Marcondes Martins⁹

Affiliations

¹ Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Avenida Limeira, 901, Bairro Areião, Piracicaba, 13414-903, SP, Brazil. Electronic address: rodrigowlins@hotmail.com.
² Institute of Physics "Gleb Wataghin", University of Campinas, Rua Sérgio Buarque de Holanda, 777, Cidade Universitária, Campinas, 13083-859, SP, Brazil. Electronic address: saphys84@gmail.com.
³ Institute of Physics "Gleb Wataghin", University of Campinas, Rua Sérgio Buarque de Holanda, 777, Cidade Universitária, Campinas, 13083-859, SP, Brazil. Electronic address: jhosorio29@gmail.com.
⁴ Institute of Physics "Gleb Wataghin", University of Campinas, Rua Sérgio Buarque de Holanda, 777, Cidade Universitária, Campinas, 13083-859, SP, Brazil. Electronic address: cmbc@ifi.unicamp.br.
⁵ Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Avenida Limeira, 901, Bairro Areião, Piracicaba, 13414-903, SP, Brazil. Electronic address: cristiane@fyodontologia.com.br.
⁶ Department of Operative Dentistry and Dental Materials, Dental School, UFU - Federal University of Uberlândia, Avenida Pará, 1720, Campus Umuarama, Uberlândia, 38400-902, MG, Brazil. Electronic address: alinearedesbicalho@gmail.com.
⁷ Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Avenida Limeira, 901, Bairro Areião, Piracicaba, 13414-903, SP, Brazil. Electronic address: thiagohs@hotmail.com.
⁸ Department of Operative Dentistry and Dental Materials, Dental School, UFU - Federal University of Uberlândia, Avenida Pará, 1720, Campus Umuarama, Uberlândia, 38400-902, MG, Brazil. Electronic address: carlosjsoares@umuarama.ufu.br.
⁹ Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Avenida Limeira, 901, Bairro Areião, Piracicaba, 13414-903, SP, Brazil. Electronic address: martins@unicamp.br.

PMID: 31280052
DOI: 10.1016/j.jmbbm.2019.06.032

Abstract

The aim of this study was to evaluate the biomechanical properties expressed by shrinkage stress, cuspal strain, fracture strength and failure mode in molars with large class II mesio-occlusal-distal restorations. Sixty-four human caries-free third molars were selected and distributed randomly into four groups: Z100 restorative material (Z100), Tetric N-Ceram Bulk-Fill (TNC), Filtek Bulk-Fill (FBF) and Aura Ultra Universal (ABF). The bulk-fill materials were inserted in one singular bulk increment and the conventional composite resin in three ones. Polymerisation shrinkage stress was evaluated by optical Fibre Bragg Gratings (FBG) sensors (n = 6). The cuspal deformation was measured using an extensometer during three moments: restorative procedure, axial compressive loading and at fracture (n = 10). The fracture strength was evaluated on a universal machine. The failure mode was analysed by Scanning Electron Microscopy (SEM). Data were analysed using one-way ANOVA tests with Tukey's posthoc test (α = 5%). Data of the failure mode were submitted to a likelihood ratio chi-square test. Z100 presented the highest mean value for the shrinkage stress (p < 0.05) by FBG evaluation, whereas bulk-fill resin groups presented low polymerisation stress mean value, especially the TNC (p < 0.05). The cuspal deformation test showed that Z100 presented a significant difference mean value compared to the other groups (p < 0.01) during the restoration and compressive axial force; however, load until the fracture presented a difference only between TNC and FBF (p < 0.05). The fracture strength of TNC was statistically different from Z100 (p < 0.01). The failure mode was not statistically different in all the groups (p > 0.05). Bulk-fill composites promoted less polymerisation shrinkage stress than conventional microhybrid composite during and after the light curing process in class II posterior resin composite restorations.

Keywords: Composite resins; Fibre optical technology; Polymerisation.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Biomechanical Phenomena
Composite Resins*
Dental Restoration, Permanent*
Materials Testing*
Mechanical Phenomena*

Substances

Composite Resins