Stronger than Ever: Multifilament Fiberglass Posts Boost Maxillary Premolar Fracture Resistance

Naji Kharouf; Eugenio Pedullà; Gianluca Plotino; Hamdi Jmal; Mohammed-El-Habib Alloui; Philippine Simonis; Patrice Laquerriere; Valentina Macaluso; Dina Abdellatif; Raphaël Richert; Youssef Haikel; Davide Mancino

doi:10.3390/jcm12082975

Stronger than Ever: Multifilament Fiberglass Posts Boost Maxillary Premolar Fracture Resistance

J Clin Med. 2023 Apr 19;12(8):2975. doi: 10.3390/jcm12082975.

Authors

Naji Kharouf^{1

2}, Eugenio Pedullà³, Gianluca Plotino⁴, Hamdi Jmal⁵, Mohammed-El-Habib Alloui¹, Philippine Simonis², Patrice Laquerriere⁶, Valentina Macaluso⁷, Dina Abdellatif⁸, Raphaël Richert^{9

10}, Youssef Haikel^{1

2

11}, Davide Mancino^{1

2

11}

Affiliations

¹ Department of Biomaterials and Bioengineering, INSERM UMR_S, Strasbourg University, 67000 Strasbourg, France.
² Department of Endodontics, Faculty of Dental Medicine, Strasbourg University, 67000 Strasbourg, France.
³ Department of General Surgery and Medical Surgical Specialties, University of Catania, 95128 Catania, Italy.
⁴ Private Practice, Grande Plotino & Torsello-Studio di Odontoiatria, 00187 Rome, Italy.
⁵ ICube Laboratory, UMR 7357 CNRS, Mechanics Department, University of Strasbourg, 67000 Strasbourg, France.
⁶ Institute Pluridisciplinaire Hubert CURIEN (IPHC), 67000 Strasbourg, France.
⁷ ESTA, School of Business and Technology, 90000 Belfort, France.
⁸ Department of Endodontics, Alexandria University, Alexandria 5424041, Egypt.
⁹ Hospices Civils de Lyon, PAM Odontologie, 69100 Lyon, France.
¹⁰ Laboratoire de Mécanique des Contacts et Structures, UMR 5259 CNRS/INSA Lyon, 69100 Lyon, France.
¹¹ Pôle de Médecine et Chirurgie Bucco-Dentaire, Hôpital Civil, Hôpitaux Universitaire de Strasbourg, 67000 Strasbourg, France.

Abstract

This paper investigates the influence of cavity configuration and post-endodontic restoration on the fracture resistance, failure mode and stress distribution of premolars by using a method of fracture failure test and finite elements analysis (FEA) coupled to Weibull analysis (WA). One hundred premolars were divided into one control group (G_contr) (n = 10) and three experimental groups, according to the post-endodontic restoration (n = 30), G₁, restored using composite, G₂, restored using single fiber post and G₃, restored using multifilament fiberglass posts (m-FGP) without post-space preparation. Each experimental group was divided into three subgroups according to the type of coronal cavity configuration (n = 10): G_1O, G_2O, and G_3O with occlusal (O) cavity configuration; G_1MO, G_2MO, and G_3MO with mesio-occlusal (MO); and G_1MOD, G_2MOD, and G_3MOD with mesio-occluso-distal (MOD). After thermomechanical aging, all the specimens were tested under compression load, and failure mode was determined. FEA and WA supplemented destructive tests. Data were statistically analyzed. Irrespective of residual tooth substance, G₁ and G₂ exhibited lower fracture resistance than G_contr (p < 0.05), whereas G₃ showed no difference compared to G_contr (p > 0.05). Regarding the type of restoration, no difference was highlighted between G_1O and G_2O, G_1MO and G_2MO, or G_1MOD and G_2MOD (p > 0.05), whereas G_3O, G_3MO, and G_3MOD exhibit higher fracture resistance (p < 0.05) than G_1O and G_2O, G_1MO and G_2MO, and G_1MOD and G_2MOD, respectively. Regarding cavity configuration: in G₁ and G_2, G_1O and G_2O exhibited higher fracture resistance than G_1MOD and G_2MOD, respectively (p < 0.05). In G₃, there was no difference among G_3O, G_3MO and G_3MOD (p > 0.05). No difference was found among the different groups and subgroups regarding the failure mode. After aging, premolars restored with multifilament fiberglass posts demonstrated fracture resistance values comparable to those of an intact tooth, irrespective of the different type of cavity configuration.

Keywords: fracture resistance; multifilament fiberglass posts; single fiber post.

Grants and funding

This research received no external funding.