Endodontic fiber post: proposal of design for enhanced transmission and scattering of light in the apical third
DOI:
https://doi.org/10.34119/bjhrv9n1-042Keywords:
endodontic post, scattering profile, prototypeAbstract
Endodontic posts are commonly used to provide mechanical reinforcement to structurally compromised teeth following endodontic treatment. These posts are securely retained within the root canal using photocurable resins and cement. As a result, it is essential that light reaches the resin layer surrounding the entire surface of the post to ensure adequate polymerization. However, light transmitted through conventional glass fiber posts undergoes significant attenuation in the light scattering intensity, with intensity decreasing exponentially along the length of the post. Typically, less than 7% of the light entering the coronal end reaches the apical tip. This reduction in light intensity may lead to incomplete polymerization of the resin in the 1/3 apical region, potentially compromising the post’s mechanical performance and treatment of teeth. In this study, we present a novel endodontic post design that can promote a very high intensity light scattered distribution through the fiber post surface. The key feature of this design is a central core fiber with an increased diameter and with mechanical marks, which enhance light transmission toward the apical third and improve the light scattering by the fiber posts.
References
CAMILOTTI, F.; BONARDI, C.; SOMER, A.; NOVATSKI, A.; SZESZ, A. L.; LOGUÉRCIO, A. D.; CRUZ, G. K. Investigating the real translucency of the endodontic fiber posts. AIP Advances, v. 8, p. 025225, 2018.
DE MORAIS, R. C. et al. Fiber-reinforced composite posts: laboratory and clinical considerations. Restorative Dentistry & Endodontics, v. 48, e18, 2023.
DOS SANTOS JUNIOR, G. C. et al. Influence of relined and non-relined fiber posts and resin cements on push-out bond strength along root canal thirds. Restorative Dentistry & Endodontics, v. 49, e7, 2024.
FRÁTER, M. et al. Effectiveness of light transmission through glass fiber posts on hardness of reinforced resin materials inside root canals. Journal of Esthetic and Restorative Dentistry, v. 36, n. 1, p. 45–54, 2024.
GIACHETTI, L.; GRANDINI, S.; CALAMAI, P.; FANTINI, G.; SCAMINACI RUSSO, D. Translucent fiber post cementation using light- and dual-curing adhesive techniques and a self-adhesive material. Journal of Dentistry, v. 37, n. 9, p. 690–697, 2009.
GORACCI, C.; CORCIOLANI, G.; VICHI, A.; FERRARI, M. Light-transmitting ability of marketed fiber posts. Journal of Dental Research, v. 87, n. 12, p. 1122–1126, 2008.
HARALUR, S. B.; ALASMARI, T. A.; ALASMARI, M. H.; HAKAMI, H. M. Light transmission of various aesthetic posts at different depths and its effect on push-out bond strength and microhardness of luting cement. Medicina, v. 58, n. 1, p. 75, 2022.
LUI, J. L. Depth of composite polymerization within simulated root canals using light-transmitting posts. Operative Dentistry, v. 19, p. 165–168, 1994a.
LUI, J. L. Depth of cure of resin composite materials. Journal of Oral Rehabilitation, v. 21, p. 257–266, 1994b.
MALULY-PRONI, A. T. et al. Influence of resin opacity in relined fiberglass posts on bond strength along root canal thirds. Brazilian Oral Research, v. 38, e042, 2024.
MIURA, S. et al. Polymerization behavior and interfacial integrity of post–core resin systems. Materials, v. 14, n. 21, p. 6281, 2021.
MORGAN, L. F. D. A. et al. Light transmission through a translucent fiber post. Journal of Endodontics, v. 34, n. 3, p. 299–302, 2008.
ROBERTS, H. W.; LEONARD, D. L.; VANDEWALLE, R. S.; COHEN, M. E.; CHARLTON, D. G. The effect of a translucent post on resin composite depth of cure. Dental Materials, v. 20, n. 7, p. 617–622, 2004.
SCHOENHALS, S. et al. Influence of fiber post customization and photoactivation protocol on bond strength. Journal of Prosthodontics, v. 31, n. 6, p. 498–506, 2022.
SERINO, G. et al. Effect of photoactivation time and root canal region on mechanical behavior of resin cements under cyclic fatigue. Dental Materials, v. 38, n. 9, p. 1447–1456, 2022.
SHIMOKAWA, C. A. K. et al. Effect of luting agents on microhardness and push-out bond strength of fiber posts. Restorative Dentistry & Endodontics, v. 48, e33, 2023.
SILVA, A. L. F.; ARIAS, V. G.; SOARES, L. E. S.; MARTIN, A. A.; MARTINS, L. R. M. Influence of fiber-post translucency on the degree of conversion of a dual-cured resin cement. Journal of Endodontics, v. 33, n. 3, p. 303–305, 2007a.
SILVA, E. M.; POSKUS, L. T.; GUIMARÃES, J. G.; ARAÚJO, M. A. J. Influence of light polymerization modes on the degree of conversion and mechanical properties of resin composites. Journal of Dentistry, v. 35, p. 833–840, 2007b.
UCHÔA, M. N. S. et al. Influence of dual-cure resin cements and fiber posts on intraradicular bond strength. Acta Odontológica Latinoamericana, v. 37, n. 1, p. 23–31, 2024.
YOLDAS, O.; ALAÇAM, T. Microhardness of composites in simulated root canals cured with light transmitting posts and glass-fiber reinforced composite posts. Journal of Endodontics, v. 31, p. 104–106, 2005a.
YOLDAS, O.; ALAÇAM, T. Microhardness of composite resins polymerized with different curing units. Journal of Prosthetic Dentistry, v. 93, n. 1, p. 55–59, 2005b.
