Abstract
This study evaluates the effect of varying resin composite thicknesses for sealing the screw-access hole of zirconia abutments on the fatigue mechanical behavior of a lithium disilicate cement-retained material. One hundred lithium disilicate discs (Ø = 10 mm, 1 mm thickness; IPS e.max CAD, Ivoclar AG) were prepared, alongside zirconia abutments (Ø = 10 mm, 3 mm thickness, 2.5 mm of screw-access hole diameter; IPS e.max ZirCAD MO, Ivoclar AG). The specimens were randomly assigned to five groups based on the thickness of sealing resin composite (Tetric N-Ceram Bulk fill, Ivoclar AG): Ctrl (only PTFE tape); PTFE tape +0.5 mm composite; PTFE tape +1.0 mm composite; PTFE tape +1.5 mm composite; and PTFE tape +2.0 mm composite. Surface treatments were conducted on ceramics before luting with dual-cure resin cement (Multilink N, Ivoclar AG). Monotonic testing was conducted at a loading rate of 1.0 mm/min until crack detection (n = 5). Cyclic fatigue testing was performed (n = 15; 100 N for 5000 cycles, followed by increments of 100 N every 10,000 cycles at 20 Hz) until failure. Finite element and Scanning Electron Microscopy analyses were also performed. One-way ANOVA and Tukey post hoc tests were used for monotonic data, while Kaplan–Meier and Mantel-Cox tests assessed survival rates (α = 0.05) based on fatigue test. No significant differences in monotonic tests were found. However, the 1.5 mm and 2.0 mm groups exhibited significantly higher fatigue failure loads compared to the Ctrl, 0.5 mm, and 1.0 mm groups (0.5 mm: 1093 N = Ctrl: 1120 N = 1.0 mm: 1127 N < 1.5 mm: 1426 N = 2.0 mm: 1307 N, p ≤ 0.05). To improve the fatigue behavior of lithium disilicate restorations bonded to zirconia abutments, more than half of the screw-access hole (greater than 1.5 mm) should be filled with resin composite.
| Original language | English |
|---|---|
| Article number | e35657 |
| Pages (from-to) | 1-10 |
| Number of pages | 10 |
| Journal | Journal of Biomedical Materials Research. Part B, Applied Biomaterials |
| Volume | 113 |
| Issue number | 10 |
| Early online date | 19 Sept 2025 |
| DOIs | |
| Publication status | Published - Oct 2025 |
Bibliographical note
Publisher Copyright:© 2025 The Author(s). Journal of Biomedical Materials Research Part B: Applied Biomaterials published by Wiley Periodicals LLC.
Funding
This research was funded by the Brazilian Federal Agency for Coordination of Improvement of Higher Education Personnel\u2014CAPES, Grant #001 (M.G.P. Master\u2019s scholarship), the Brazilian National Council for Scientific and Technological Development, Brazil\u2014CNPq, process number #151001/2024\u20103 (P.M.S. Post\u2010Doctorate\u2019s scholarship) and # 402916/2024\u20107 (P.M.S. international project, MCTI scholarship); process number #304665/2022\u20103 (G.K.R.P. research productivity scholarship Pq2), and by Research Foundation of the Rio Grande do Sul State (FAPERGS) (F.C.\u2019s Scientific Initiation Scholarship; grant # 21/2551\u20100001961\u20101; and PqG call, G.K.R.P. grant #24/2551\u20100001408\u20100). We especially thank Ivoclar AG for donating some materials and emphasize that those institutions had no role in the study design, data collection or analysis, decision to publish, or manuscript preparation. The Article Processing Charge for the publication of this research was funded by the Coordena\u00E7\u00E3o de Aperfei\u00E7oamento de Pessoal de N\u00EDvel Superior \u2010 Brasil (CAPES) (ROR identifier: 00x0ma614). Funding: This work was supported by Coordena\u00E7\u00E3o de Aperfei\u00E7oamento de Pessoal de N\u00EDvel Superior, 001; Conselho Nacional de Desenvolvimento Cient\u00EDfico e Tecnol\u00F3gico, 151001/2024-3, 402916/2024-7, 304665/2022-3; Funda\u00E7\u00E3o de Amparo \u00E0 Pesquisa do Estado do Rio Grande do Sul. This research was funded by the Brazilian Federal Agency for Coordination of Improvement of Higher Education Personnel\u2014CAPES, Grant #001 (M.G.P. Master\u2019s scholarship), the Brazilian National Council for Scientific and Technological Development, Brazil\u2014CNPq, process number #151001/2024-3 (P.M.S. Post-Doctorate\u2019s scholarship) and # 402916/2024-7 (P.M.S. international project, MCTI scholarship); process number #304665/2022-3 (G.K.R.P. research productivity scholarship Pq2), and by Research Foundation of the Rio Grande do Sul State (FAPERGS) (F.C.\u2019s Scientific Initiation Scholarship; grant # 21/2551-0001961-1; and PqG call, G.K.R.P. grant #24/2551-0001408-0). We especially thank Ivoclar AG for donating some materials and emphasize that those institutions had no role in the study design, data collection or analysis, decision to publish, or manuscript preparation. The Article Processing Charge for the publication of this research was funded by the Coordena\u00E7\u00E3o de Aperfei\u00E7oamento de Pessoal de N\u00EDvel Superior - Brasil (CAPES) (ROR identifier: 00x0ma614). This work was supported by Coordena\u00E7\u00E3o de Aperfei\u00E7oamento de Pessoal de N\u00EDvel Superior, 001; Conselho Nacional de Desenvolvimento Cient\u00EDfico e Tecnol\u00F3gico, 151001/2024\u20103, 402916/2024\u20107, 304665/2022\u20103; Funda\u00E7\u00E3o de Amparo \u00E0 Pesquisa do Estado do Rio Grande do Sul. Funding:
| Funders | Funder number |
|---|---|
| Research Foundation of the Rio Grande do Sul State | |
| Brazilian Federal Agency for Coordination of Improvement of Higher Education Personnel | |
| MCTI | |
| Brazilian National Council for Scientific and Technological Development | |
| Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul | |
| CNPq | |
| FAPERGS | 21/2551‐0001961‐1, 24/2551‐0001408‐0 |
| Conselho Nacional de Desenvolvimento Científico e Tecnológico | 151001/2024‐3, 304665/2022‐3, 402916/2024‐7 |
| Coordenação de Aperfeiçoamento de Pessoal de Nível Superior | 00x0ma614 |
| CAPES | 001 |
| Ministério da Ciência, Tecnologia e Inovação | Pq2 |
Keywords
- cyclic fatigue test
- dental prosthesis
- implant supported
- sealing protocol
- zirconia abutments