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Effect of the restorative technique on load-bearing capacity, cusp deflection, and stress distribution of endodontically-treated premolars with MOD restoration

Restorative Dentistry & Endodontics 2019년 44권 3호 p.33 ~ 33
 ( da Rocha Daniel Maranha ) - Federal University of Sergipe Department of Dentistry

 ( Tribst Joao Paulo Mendes ) - Sao Paulo State University Department of Dental Materials and Prosthodontics
 ( Ausiello Pietro ) - University of Naples Federico II School of Dentistry Department of Neurosciences, Reproductive and Odontostomatological Sciences
 ( de Oliveira Dal Piva Amanda Maria ) - Sao Paulo State University Department of Dental Materials and Prosthodontics
 ( da Rocha Milena Cerqueira ) - Federal University of Sergipe Department of Dentistry
 ( Di Nicolo Rebeca ) - Sao Paulo State University Department of Pediatric and Social Dentistry
 ( Borges Alexandre Luiz Souto ) - Sao Paulo State University Department of Dental Materials and Prosthodontics

Abstract


Objectives: To evaluate the influence of the restorative technique on the mechanical response of endodontically-treated upper premolars with mesio-occluso-distal (MOD) cavity.

Materials and Methods: Forty-eight premolars received MOD preparation (4 groups, n = 12) with different restorative techniques: glass ionomer cement + composite resin (the GIC group), a metallic post + composite resin (the MP group), a fiberglass post + composite resin (the FGP group), or no endodontic treatment + restoration with composite resin (the CR group). Cusp strain and load-bearing capacity were evaluated. One-way analysis of variance and the Tukey test were used with α = 5%. Finite element analysis (FEA) was used to calculate displacement and tensile stress for the teeth and restorations.

Results: MP showed the highest cusp (p = 0.027) deflection (24.28 ± 5.09 μm/μm), followed by FGP (20.61 ± 5.05 μm/μm), CR (17.72 ± 6.32 μm/μm), and GIC (17.62 ± 7.00 μm/μm). For load-bearing, CR (38.89 ± 3.24 N) showed the highest, followed by GIC (37.51 ± 6.69 N), FGP (29.80 ± 10.03 N), and MP (18.41 ± 4.15 N) (p = 0.001) value. FEA showed similar behavior in the restorations in all groups, while MP showed the highest stress concentration in the tooth and post.

Conclusions: There is no mechanical advantage in using intraradicular posts for endodontically-treated premolars requiring MOD restoration. Filling the pulp chamber with GIC and restoring the tooth with only CR showed the most promising results for cusp deflection, failure load, and stress distribution.

키워드

Cusp deflection; Endodontics; Load-bearing; Restorative dentistry; Stress distribution; Finite element analysis
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