Factors Influencing the Screw Stability of Implant-Supported Single Crowns: An In Vitro Study
Highlights
- This study investigates the influence of retention type, implant/abutment angulation and the presence of sealant or disinfectant agents on the screw stability of implant-supported single crowns.
- Screw-retained restorations are more prone to screw loosening than cement-retained ones.
- Abutment angulation and the presence of gutta-percha or chlorhexidine gel did not show a significant impact on the screw stability of implant-supported single restorations.
- No restorations became loose after a simulated clinical service of 5 years under 98 N load.
Abstract
1. Introduction
2. Materials and Methods
2.1. Study Design
2.2. Sample Preparation
2.3. Dynamic Loading Tests
2.4. Reverse Torque Measurements
2.5. Statistical Analyses
3. Results
4. Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
Ang | Angulated |
Cem | Cemented |
CHX | Chlorhexidine |
FDP | Fixed dental prosthesis |
GP | Gutta-percha |
Ncm | Newton centimeter |
RTD | Reverse torque difference |
RTV | Reverse torque value |
SC | Single crown |
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Group Name | Type of Retention | Implant/Abutment Angulation | Screw Chamber Filling |
---|---|---|---|
Cem_control | Cement-retained | straight | No |
Cem_GP | Cement-retained | straight | Gutta-percha (in screw access hole above the screw |
Cem_CHX | Cement-retained | straight | Chlorhexidine gel (in screw chamber below the screw) |
Cem_Ang | Cement-retained | angulated (20°) | No |
Screw | Screw-retained | straight | No |
Tested Group | Preloading Screw-In Torque (Ncm) | Postloading Screw-In Torque (Ncm) | Reverse Torque Difference (RTD) | Removal Torque Loss (%) |
---|---|---|---|---|
Cem_control | 20.14 ± 0.12 | 17.88 ± 2.16 | 2.26 ± 2.16 | 11.22 ± 10.79% |
Cem_GP | 20.12 ± 0.09 | 17.90 ± 1.04 | 2.22 ± 1.03 | 11.03 ± 5.12% |
Cem_CHX | 20.09 ± 0.10 | 17.18 ± 2.57 | 2.91 ± 2.56 | 14.48 ± 13.02% |
Cem_Ang | 20.08 ± 0.08 | 17.04 ± 1.91 | 3.04 ± 1.91 | 15.13 ± 9.36% |
Screw | 20.11 ± 0.16 | 15.46 ± 1.77 | 4.65 ± 1.76 | 23.12 ± 8.90% |
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Bishti, S.; Alsagher, M.S.E.; Homa, M.; Wolfart, S.; Tuna, T. Factors Influencing the Screw Stability of Implant-Supported Single Crowns: An In Vitro Study. Materials 2025, 18, 506. https://doi.org/10.3390/ma18030506
Bishti S, Alsagher MSE, Homa M, Wolfart S, Tuna T. Factors Influencing the Screw Stability of Implant-Supported Single Crowns: An In Vitro Study. Materials. 2025; 18(3):506. https://doi.org/10.3390/ma18030506
Chicago/Turabian StyleBishti, Shaza, Mohamad Shams Eddin Alsagher, Martin Homa, Stefan Wolfart, and Taşkın Tuna. 2025. "Factors Influencing the Screw Stability of Implant-Supported Single Crowns: An In Vitro Study" Materials 18, no. 3: 506. https://doi.org/10.3390/ma18030506
APA StyleBishti, S., Alsagher, M. S. E., Homa, M., Wolfart, S., & Tuna, T. (2025). Factors Influencing the Screw Stability of Implant-Supported Single Crowns: An In Vitro Study. Materials, 18(3), 506. https://doi.org/10.3390/ma18030506