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Randomized prospective clinical trial of class II restorations using flowable bulk-fill resin composites: 4-year follow-up

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Abstract

Objectives

This randomized, prospective, and split-mouth study aimed to evaluate flowable bulk-fill resin composites in class II restorations, comparing it with a conventional layering technique after 4-year follow-up.

Materials and methods

Fifty-three subjects received three class II restorations according to the restorative systems: conventional microhybrid composite resin (PA – Peak Universal + Amelogen Plus, Ultradent); flowable bulk-fill and nanoparticulate composite resins (ABF – Adper Single Bond 2 + Filtek Bulk Fill Flow + Filtek Z350XT, 3M/Espe); and flowable bulk-fill and microhybrid composite resins, (XST – XP Bond + SDR + TPH3, Dentsply). The clinical performance and interproximal contacts were evaluated. Statistical analyses were performed using the Kaplan-Meier, equality test of two proportions, Friedman, Wilcoxon, Kruskal-Wallis, Mann-Whitney, and Logistic regression analysis tests (alpha = 0.05).

Results

In total, 106 restorations were evaluated at 4 years. Both systems with bulk-fill composites presented higher marginal discoloration than PA. About surface texture, ABF restorative system showed superior bravo scores being statistically similar to XST. Better performance for wear and surface staining was found for XST restorative system. All restorative systems resulted in the decreased interproximal contacts, occurring early for XST.

Conclusions

The restorative systems that used flowable bulk-fill resin composites showed satisfactory clinical performance compared with conventional resin composite after 4 years. All restorative systems had decreased proximal contact after 4 years.

Clinical relevance

Initial marginal discoloration was observed in more than 50% of class II restorations performed with restorative systems that used flowable bulk-fill resin composite. All restorative systems had decreased proximal contact strength over time.

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Authors and Affiliations

  1. Department of Preventive and Restorative Dentistry, School of Dentistry Araçatuba, São Paulo State University (UNESP), José Bonifácio, Araçatuba, São Paulo, Vila Mendonça, 1193, Brazil

    Isis Almela Endo Hoshino, André Luiz Fraga Briso, Lara Maria Bueno Esteves, Sandra Meira Borghi Frascino & Ticiane Cestari Fagundes

  2. Department of Dental Materials and Prosthodontics, School of Dentistry Araçatuba, São Paulo State University (UNESP), José Bonifácio, Araçatuba, São Paulo, Vila Mendonça, 1193, Brazil

    Paulo Henrique dos Santos

Authors
  1. Isis Almela Endo Hoshino
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  2. André Luiz Fraga Briso
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  3. Lara Maria Bueno Esteves
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  5. Sandra Meira Borghi Frascino
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  6. Ticiane Cestari Fagundes
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Correspondence to Ticiane Cestari Fagundes.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional committee (approval code: 1.235.100) and the study was registered (#RBR-3gg3mg) and conducted according to CONSORT guidelines.

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Endo Hoshino, I.A., Fraga Briso, A.L., Bueno Esteves, L.M. et al. Randomized prospective clinical trial of class II restorations using flowable bulk-fill resin composites: 4-year follow-up. Clin Oral Invest 26, 5697–5710 (2022). https://doi.org/10.1007/s00784-022-04526-6

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  • DOI: https://doi.org/10.1007/s00784-022-04526-6

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