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J Dent Res Dent Clin Dent Prospects. 2021;15(3): 188-196.
doi: 10.34172/joddd.2021.032
  Abstract View: 121
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Basic Research

Original Article

Effect of three different veneering techniques on the stress distribution and in vitro fatigue behavior of core-veneer all-ceramic fixed partial dentures

Alexandre Luiz Souto Borges 1 ORCID logo, Anna Karina Figueiredo Costa 1 ORCID logo, Amanda Maria de Oliveira Dal Piva 1 ORCID logo, Alana Barbosa Alves Pinto 1 ORCID logo, João Paulo Mendes Tribst 1* ORCID logo

1 Department of Dental Materials and Prosthodontics, São Paulo State University, Institute of Science and Technology, Brazil
*Corresponding author: João Paulo Mendes Tribst, Email: joao.tribst@gmail.com

Abstract

Background. The present study aimed to evaluate the influence of the veneering technique on the tensile stress distribution and survival of full-ceramic fixed dental prostheses (FDPs).

Methods. A three-dimensional model of an FDP was modeled on a second premolar and a second molar with a pontic between them for finite element analysis (FEA). The groups were divided according to the veneering technique: conventional stratification, rapid layer, and CAD-on techniques. A mesh control test determined the number of elements and nodes. The materials’ properties were attributed to each solid component with isotropic, homogeneous, and linear elastic behavior. For the in vitro fatigue test (n=30), the FDPs were cemented on dentin analog abutments and submitted to 2×106 mechanical cycles (100 N at 3 Hz).

Results. Maximum principal stress showed that the connector between the pontic and the second molar concentrated higher stresses, regardless of the techniques: Rapid layer (6 MPa)> CAD-on (5.5 MPa)> conventional stratification (4 MPa). The conventional stratification technique concentrated high stresses at the interface between the framework and veneering ceramic (2 MPa), followed by the rapid layer (1.8 MPa) and CAD-on (1.5 MPa) techniques. The crowns fabricated using the rapid layer and CAD-on techniques exhibited a 100% survival rate, while the conventional stratification group had 0% survival.

Conclusion. Even with similar stress distribution between the veneering techniques, the conventional stratification technique was more prone to failure under fatigue due to higher defects incorporated than CAD-on and rapid layer techniques.


Keywords: Computer-aided design, Dental materials, Fatigue, Finite element analysis

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Submitted: 05 Oct 2020
Accepted: 05 Apr 2021
ePublished: 25 Aug 2021
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