Tags

Type your tag names separated by a space and hit enter

Effects of fiber-glass-reinforced composite restorations on fracture resistance and failure mode of endodontically treated molars.
J Dent. 2016 10; 53:82-7.JD

Abstract

OBJECTIVES

The study evaluated the fracture resistance and fracture patterns of endodontically treated mandibular first molars restored with glass-fiber-reinforced direct composite restorations.

METHODS

In total, 60 extracted intact first molars were treated endodontically; a mesio-occluso-distal (MOD) cavity was prepared and specimens were then divided into six groups: sound teeth (G1), no restoration (G2), direct composite restoration (G3), fiber-post-supported direct composite restoration (G4), direct composite reinforced with horizontal mesio-distal glass-fibers (G5), and buccal-palatal glass-fibers (G6). Specimens were subjected to 5000 thermocycles and 20,000 cycles of 45° oblique loading force at 1.3Hz and 50N; they were then loaded until fracture. The maximum fracture loads were recorded in Newtons (N) and data were analyzed with one-way ANOVA and post-hoc Tukey tests (p<0.05). Fractured specimens were analyzed with a scanning electron microscope (SEM).

RESULTS

The mean static loads (in Newtons) were: G1, 831.83; G2, 282.86; G3, 364.18; G4, 502.93; G5, 499.26; and G6, 582.22. Fracture resistance did not differ among G4, G5, and G6, but was significantly higher than G3 (p=0.001). All specimens fractured in a catastrophic way. In G6, glass fibers inducted a partial deflection of the fracture, although they were not able to stop crack propagation.

CONCLUSIONS

For the direct restoration of endodontically treated molars, reinforcement of composite resins with glass-fibers or fiber posts can enhance fracture resistance. The SEM analysis showed a low ability of horizontal glass-fibers to deviate the fracture, but this effect was not sufficient to lead to more favorable fracture patterns above the cement-enamel junction (CEJ).

CLINICAL SIGNIFICANCE

The fracture resistance of endodontically treated molars restored with direct composite restorations seems to be increased by reinforcement with fibers, even if it is insufficient to restore sound molar fracture resistance and cannot avoid vertical fractures.

Links

Publisher Full Text (DOI)

Authors+Show Affiliations

Department of Surgical Sciences, Dental School Lingotto, University of Turin, Via Nizza 230, Turin, Italy. Electronic address: nicola.scotti@unito.it.

Department of Surgical Sciences, Dental School Lingotto, University of Turin, Via Nizza 230, Turin, Italy.

Department of Surgical Sciences, Dental School Lingotto, University of Turin, Via Nizza 230, Turin, Italy.

Department of Surgical Sciences, Dental School Lingotto, University of Turin, Via Nizza 230, Turin, Italy.

Division of Cariology and Endodontology, School of Dentistry, University of Geneva, Rue Barthèlemy-Menn, Geneva, Switzerland.

Department of Surgical Sciences, Dental School Lingotto, University of Turin, Via Nizza 230, Turin, Italy.

Department of Surgical Sciences, Dental School Lingotto, University of Turin, Via Nizza 230, Turin, Italy.

Department of Surgical Sciences, Dental School Lingotto, University of Turin, Via Nizza 230, Turin, Italy.

MeSH

Composite ResinsDental Stress AnalysisGlassMolarPost and Core TechniqueTooth FracturesTooth, Nonvital

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27492772

Citation

Scotti, Nicola, et al. "Effects of Fiber-glass-reinforced Composite Restorations On Fracture Resistance and Failure Mode of Endodontically Treated Molars." Journal of Dentistry, vol. 53, 2016, pp. 82-7.

Scotti N, Forniglia A, Tempesta RM, et al. Effects of fiber-glass-reinforced composite restorations on fracture resistance and failure mode of endodontically treated molars. J Dent. 2016;53:82-7.

Scotti, N., Forniglia, A., Tempesta, R. M., Comba, A., Saratti, C. M., Pasqualini, D., Alovisi, M., & Berutti, E. (2016). Effects of fiber-glass-reinforced composite restorations on fracture resistance and failure mode of endodontically treated molars. Journal of Dentistry, 53, 82-7. https://doi.org/10.1016/j.jdent.2016.08.001

Scotti N, et al. Effects of Fiber-glass-reinforced Composite Restorations On Fracture Resistance and Failure Mode of Endodontically Treated Molars. J Dent. 2016;53:82-7. PubMed PMID: 27492772.

* Article titles in AMA citation format should be in sentence-case

TY - JOUR T1 - Effects of fiber-glass-reinforced composite restorations on fracture resistance and failure mode of endodontically treated molars. AU - Scotti,Nicola, AU - Forniglia,Alberto, AU - Tempesta,Riccardo Michelotto, AU - Comba,Allegra, AU - Saratti,Carlo Massimo, AU - Pasqualini,Damiano, AU - Alovisi,Mario, AU - Berutti,Elio, Y1 - 2016/08/01/ PY - 2016/03/12/received PY - 2016/07/17/revised PY - 2016/08/01/accepted PY - 2016/8/6/entrez PY - 2016/8/6/pubmed PY - 2018/5/3/medline KW - Direct composite KW - Endodontically treated KW - Fractography KW - Fracture resistance KW - Glass-fiber SP - 82 EP - 7 JF - Journal of dentistry JO - J Dent VL - 53 N2 - OBJECTIVES: The study evaluated the fracture resistance and fracture patterns of endodontically treated mandibular first molars restored with glass-fiber-reinforced direct composite restorations. METHODS: In total, 60 extracted intact first molars were treated endodontically; a mesio-occluso-distal (MOD) cavity was prepared and specimens were then divided into six groups: sound teeth (G1), no restoration (G2), direct composite restoration (G3), fiber-post-supported direct composite restoration (G4), direct composite reinforced with horizontal mesio-distal glass-fibers (G5), and buccal-palatal glass-fibers (G6). Specimens were subjected to 5000 thermocycles and 20,000 cycles of 45° oblique loading force at 1.3Hz and 50N; they were then loaded until fracture. The maximum fracture loads were recorded in Newtons (N) and data were analyzed with one-way ANOVA and post-hoc Tukey tests (p<0.05). Fractured specimens were analyzed with a scanning electron microscope (SEM). RESULTS: The mean static loads (in Newtons) were: G1, 831.83; G2, 282.86; G3, 364.18; G4, 502.93; G5, 499.26; and G6, 582.22. Fracture resistance did not differ among G4, G5, and G6, but was significantly higher than G3 (p=0.001). All specimens fractured in a catastrophic way. In G6, glass fibers inducted a partial deflection of the fracture, although they were not able to stop crack propagation. CONCLUSIONS: For the direct restoration of endodontically treated molars, reinforcement of composite resins with glass-fibers or fiber posts can enhance fracture resistance. The SEM analysis showed a low ability of horizontal glass-fibers to deviate the fracture, but this effect was not sufficient to lead to more favorable fracture patterns above the cement-enamel junction (CEJ). CLINICAL SIGNIFICANCE: The fracture resistance of endodontically treated molars restored with direct composite restorations seems to be increased by reinforcement with fibers, even if it is insufficient to restore sound molar fracture resistance and cannot avoid vertical fractures. SN - 1879-176X UR - https://www.unboundmedicine.com/medline/citation/27492772/Effects_of_fiber_glass_reinforced_composite_restorations_on_fracture_resistance_and_failure_mode_of_endodontically_treated_molars_ DB - PRIME DP - Unbound Medicine ER -