In Vitro Fracture Strength of Teeth Restored with Lithium Disilicate Onlays with and without Fiber Post Build-Up

Abstract

To our knowledge there is no data about the mechanical performance of indirect restoration adhesively cemented on teeth without an adequate build-up to provide the correct geometrical configuration. The aim of this study was to compare the fracture strength of human teeth restored with lithium disilicate onlays, with and without fiber post build-up. Methods: Twenty human mandibular molars were horizontally sectioned and divided into two groups (n = 10). No treatment was applied in group A. Teeth in group B were endodontically treated, built-up using fiber post and composite core and prepared with a circumferential chamfer providing a 1 mm circumferential ferrule. Lithium disilicate onlays were pressed and luted on teeth using dual-curing luting composite. Teeth were tested under static load. Failures were classified as restorable or not restorable. Failure loads were analyzed with one-way analysis of variance. Failure modes were compared using Pearson’s Chi-square tests. Results: The mean fracture loads were 1383.5 N for group A and 1286.3 N for group B. No difference was found (p = 0.6). Ninety per cent of fractures were classified as not restorable in both groups, with no difference (p = 0.8). Conclusions: For teeth restored with adhesive procedures and lithium disilicate onlays, the presence of build-up with fiber post to provide retention and resistance form does not influence the fracture strength.

Influência da férula na resistência à fratura de restaurações com utilização ou não de retentores intrarradiculares em dentes tratados endodonticamente

“…Os retentores intrarradiculares, independentemente do seu material de fabricação (metálicos fundidos, ou pré-fabricados como os de fibra de vidro, carbono ou quartzo), foram desenvolvidos para aumentar a retenção da restauração. Com esse pressuposto, alguns estudos têm demonstrado que a presença da férula pode ser determinante para o uso ou não de retentores intrarradiculares, podendo prescindir da utilização deste no tratamento reabilitador (DE LIMA et al, 2010;MAGNE et al, 2017;MOBILIO et al, 2018;KHABADZE et al, 2020) Entretanto, outros estudos asseguram a eficácia da utilização de pinos de fibra de vidro como retenção para as restaurações protéticas, mesmo em dentes com a presença de férula (SALAMEH et al, 2010;LAZARI et al, 2018)…”

Effect of post length and material on the fracture resistance of endodontically treated maxillary central incisors: An In vitro study

“…Glass fiber posts, however, are regarded as prefabricated posts and may only have a few applications in the restoration of teeth that have undergone endodontic treatment. The decision to use a custom-made post or a prefabricated one depends on a variety of criteria, including the design of the canal, the amount of surviving tooth structure, and the restorative approach (10,11) . Metal, zirconia, heat-pressed ceramics, and most recently Polyetheretherketone (PEEK) (12,13) can all be used to create unique custom posts.…”

The Use of Polyetheretherketone (PEEK) as an Alternative Post and Core Material: Five-Year Follow-Up Report

“…In cases of extensive coronal tooth destruction, where extra retention is required, a post should be inserted to the root in order to retain the core and the restoration [ 4 , 5 , 6 ] The choice between using a custom-made post or a prefabricated one relies on multiple factors, such as canal configuration, remaining tooth structure and restorative technique [ 7 , 8 , 9 ] The custom-made posts are fabricated mainly from metal, zirconia, and fiber-reinforced composite [ 10 , 11 , 12 , 13 , 14 ].…”