Refereed journal article or data article (A1)

Fatigue performance of endodontically treated molars restored with different dentin replacement materials




List of Authors: Molnár Janka, Fráter Márk, Sáry Tekla, Braunitzer Gábor, Vallittu Pekka K, Lassila Lippo, Garoushi Sufyan

Publication year: 2022

Journal: Dental Materials

Volume number: 38

Issue number: 4

DOI: http://dx.doi.org/10.1016/j.dental.2022.02.007

URL: https://doi.org/10.1016/j.dental.2022.02.007

Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/73887894


Abstract

Objectives: The aim was to investigate the fatigue performance of endodontically treated (ET) molars restored by various dentin-replacing materials and material configurations. Moreover, the impact of additional adhesive treatment with glass-ionomer cement (GIC) was evaluated.

Methods: 250 intact molars were collected and randomly distributed into ten groups (n = 25). After endodontic procedure standard Class I cavities were prepared and restored with different direct restorative techniques and dentin-replacing materials. Two-group were restored with either packable or flowable short fiber-reinforced composites (SFRCs). Two-group were restored by experimental fiber-reinforced GIC with and without adhesive treatment. Four-group were restored by conventional and resin-modified GICs with or without adhesive treatment. One-group was restored with a dual-cure composite resin and last group was restored with only conventional composite resin (control). Fatigue-survival was measured for all specimens using a cyclic-loading machine until fracture occurred or a number of 40.000 cycles were achieved. Kaplan-Meyer survival analysis was conducted, followed by pairwise log-rank post hoc comparisons. Fracture mode was then examined by means of optical microscopy and SEM.

Results: Group restored with flowable SFRC showed significantly higher survival (p < 0.05) compared to all of the groups, except for group restored with packable SFRC (p > 0.05). Group restored with fiber-reinforced GIC had significantly (p < 0.05) higher survival rates compared to other commercial GICs. SEM demonstrated change of the fracture line when fracture reached the SFRC layer.

Significance: Direct restoration of Class I in ET molars with the use of SFRCs as dentin-replacing materials demonstrated its ability to reinforce the dental structures and to increase the fatigue resistance in this specific clinical situation.

Keywords: Fatigue survival; Fiber-reinforced glass ionomer cement; Occlusal cavity; Root canal treated molar teeth; Short fiber-reinforced composite.


Downloadable publication

This is an electronic reprint of the original article.
This reprint may differ from the original in pagination and typographic detail. Please cite the original version.




Last updated on 2022-12-04 at 12:41