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99 - Fracture resistance and failure mode of polyethylene fiber-reinforced resin-based restorations.

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Title: 99 - Fracture resistance and failure mode of polyethylene fiber-reinforced resin-based restorations.
Authors: Canobra, LF1,2 (AUTHOR), Parra Gatica, E1 (AUTHOR), Medina, C2 (AUTHOR), Wendler, M1 (AUTHOR)
Source: Dental Materials. 2023 Supplement 1, Vol. 39, pe57-e57. 1p.
Subjects: Failure mode & effects analysis, Polyethylene fibers, Fractography, Metal fractures, Polyethylene
Abstract: The use of fibers to reinforce directly placed resin-based restorations has gained popularity over the last decade. Despite their potential for cusp coverage and extensive tooth reconstruction, controversy has risen regarding their efficacy when applied to intra-coronal restorations. Therefore, the aim of this study was to determine the fracture resistance and failure mode of extensive MOD resin-based restorations, with or without polyethylene fiber reinforcement. Fifty-four intact extracted premolars were prepared with extensive MOD cavities and standardized endodontic accesses. After application of the adhesive treatment, the teeth were randomly assigned to one of three restorative protocols (n=18): incremental technique (I), incremental technique reinforced with a flat (H) or concave (U) polyethylene fiber strip. Following 45 days of water storage, restored teeth were loaded until fracture with a round-ended metal piston in an axial (A, n=9) or para-axial (PA, n=9) configuration. Fractographic analysis of the fragments was conducted using stereomicroscopy and SEM. Failure mode was classified according to the extension and direction of crack propagation. Normality of the data was assessed with the Shapiro-Wilk test and further analyzed using two-way ANOVA. The Tukey's post-hoc test was used for pairwise comparisons (p<0.05). The statistical analysis revealed a significant association between the restorative protocol and the fracture resistance of the restored teeth, with the I group outperforming both fiber reinforced groups. Force values ranged between 1104 N (SD=156) in the I-A and 470 N (SD=32) in the U-PA subgroups. Association between the loading configuration and fracture resistance was only statistically significant for the I group. Regarding failure mode, none of the independent variables showed a statistically significant association with the fracture patterns. One third of the samples displayed minor chipping of the occlusal enamel, whereas the other two thirds had complete cuspal detachment, with the crack propagating below the cemento-enamel junction in half of these catastrophic failures. Within the limitations of the current study, polyethylene fiber reinforcement demonstrated a limited efficacy to improve the fracture resistance and behavior of intra-coronal MOD resin-based restorations. Accordingly, and considering the higher costs and time involved, their utilization seems to provide little benefit to both, clinicians, and patients. [Display omitted] [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The use of fibers to reinforce directly placed resin-based restorations has gained popularity over the last decade. Despite their potential for cusp coverage and extensive tooth reconstruction, controversy has risen regarding their efficacy when applied to intra-coronal restorations. Therefore, the aim of this study was to determine the fracture resistance and failure mode of extensive MOD resin-based restorations, with or without polyethylene fiber reinforcement. Fifty-four intact extracted premolars were prepared with extensive MOD cavities and standardized endodontic accesses. After application of the adhesive treatment, the teeth were randomly assigned to one of three restorative protocols (n=18): incremental technique (I), incremental technique reinforced with a flat (H) or concave (U) polyethylene fiber strip. Following 45 days of water storage, restored teeth were loaded until fracture with a round-ended metal piston in an axial (A, n=9) or para-axial (PA, n=9) configuration. Fractographic analysis of the fragments was conducted using stereomicroscopy and SEM. Failure mode was classified according to the extension and direction of crack propagation. Normality of the data was assessed with the Shapiro-Wilk test and further analyzed using two-way ANOVA. The Tukey's post-hoc test was used for pairwise comparisons (p<0.05). The statistical analysis revealed a significant association between the restorative protocol and the fracture resistance of the restored teeth, with the I group outperforming both fiber reinforced groups. Force values ranged between 1104 N (SD=156) in the I-A and 470 N (SD=32) in the U-PA subgroups. Association between the loading configuration and fracture resistance was only statistically significant for the I group. Regarding failure mode, none of the independent variables showed a statistically significant association with the fracture patterns. One third of the samples displayed minor chipping of the occlusal enamel, whereas the other two thirds had complete cuspal detachment, with the crack propagating below the cemento-enamel junction in half of these catastrophic failures. Within the limitations of the current study, polyethylene fiber reinforcement demonstrated a limited efficacy to improve the fracture resistance and behavior of intra-coronal MOD resin-based restorations. Accordingly, and considering the higher costs and time involved, their utilization seems to provide little benefit to both, clinicians, and patients. [Display omitted] [ABSTRACT FROM AUTHOR]
ISSN:01095641
DOI:10.1016/j.dental.2023.08.114