Influence of abrasive dentifrices on polymeric reconstructive material properties after simulated toothbrushing

Abstract

To assess the influence of dentifrices with different abrasiveness levels on the properties of dental reconstructive materials. Forty-eight cylinders were obtained from four polymeric materials, being two CAD/CAM acrylic resins (Ivotion-Dent and Ivotion-Base), one injected acrylic resin (IvoBase-Hydrid) and one light-cured resin composite (Empress Direct). Specimens were allocated to four subgroups for toothbrushing simulation according to the dentifrice relative dentin abrasivity (RDA) and silica content: (i) RDA 0 = 0%; (ii) RDA 50 = 3%; (iii) RDA 100 = 10%; and (iv) RDA 120 = 25%. Specimens were then subjected to toothbrushing. Surface analyses [surface roughness Ra (SR) and scanning electron microscopy (SEM)] along with hardness and optical properties [translucency parameter (TP) and contrast ratio (CR)] were evaluated before and after toothbrushing. Statistical analyses were performed using ANOVA and Tukey test. A significant increase in SR was observed after toothbrushing with higher RDA toothpastes for Ivotion-Dent (100 and 120) and IvoBase-Hybrid (120). Ivotion-Base and Empress Direct presented no significant differences in SR when analyzed as a function of timepoint and RDA levels. Hardness was not influenced by toothbrushing with different RDA dentifrices, except for Empress Direct with RDA 0 toothpaste, where a decrease in the hardness was observed. TP of Ivotion-Dent and Empress Direct significantly decreased after toothbrushing with higher RDA dentifrices and CR of Ivotion-Dent, Empress Direct and IvoBase-Hybrid significantly increased with higher RDA dentifrices. The levels of dentifrice abrasiveness affected differently the SR, hardness and optical properties of polymeric reconstructive materials after toothbrushing.

Keywords:

• Resin composite
• acrylic resin
• toothbrushing
• surface roughness
• hardness

Author’s contribution

L. F.de Carvalho: Conceptualization, Methodology, Investigation, Software, Formal analysis, Writing – original draft. L. M. M. Alves: Conceptualization, Methodology, Formal analysis, Resources, Writing – review & editing. E. T. P. Bergamo: Conceptualization, Methodology, Formal analysis, Resources, Supervision, Writing – review & editing. E. B. Benalcazar Jalkh: Conceptualization, Methodology, Formal analysis, Resources, Writing – review & editing. T. M. B. Campos: Methodology, Visualization, Resources, Formal analysis, Writing – review & editing. A. Zahoui: Methodology, Investigation, Data curation, Validation, Writing – review & editing. E. de S. Fermino: Methodology, Investigation, Data curation, Validation, Writing – review & editing. A. C. Magalhães: Conceptualization, Methodology, Validation, Supervision, Resources, Formal analysis, Writing – review & editing. T. L. Silva: Methodology, Visualization, Resources, Formal analysis, Writing – review & editing. P. G. Coelho: Conceptualization, Formal analysis, Methodology, Resources, Supervision, Writing – review & editing. E.A. Bonfante: Conceptualization, Formal analysis, Funding acquisition, Methodology, Investigation, Project administration, Resources, Supervision, Writing – original draft, Writing – review & editing.

Disclosure statement

The authors declare no conflict of interest.

Key message

This study highlights the importance of using an adequate dentifrice for each clinical situation to preserve the materials properties.

Data availability statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

Additional information

Funding

This research was funded by São Paulo Research foundation (FAPESP) [grants numbers #2019/08693-1, #2021/08018-2, #2020/12874-9, #2021/07440-2, #2022/07157-1, #2022/13426-5, #2021/06730-7]; National Council for Scientific and Technological Development (CNPq) [grants numbers # 307255/2021-2, # 141255/2021-8].