Short communication: Influence of retainer configuration and loading direction on the stress distribution of lithium disilicate resin-bonded fixed dental prostheses: 3D finite element analysis

Amanda M.O. Dal Piva, João P.M. Tribst*, Guilherme S.F.A. Saavedra, Rodrigo O.A. Souza, Renata M. de Melo, Alexandre L.S. Borges, M. Özcan

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The present study elucidates the mechanical performance of different designs of resin-bonded fixed dental prostheses made of lithium disilicate simulating masticatory loads of anterior or canine guidance. A three-dimensional model of maxilla was constructed containing central incisor and canine teeth, with edentulous space of the lateral incisor. Three designs of prosthesis were created: retained in central incisor (1-I), retained in canine (1-C) and fixed in both teeth (2-IC). The computational analysis was performed for load in canine and central incisor separately (100N, 45°). The tensile and shear stresses were calculated for the resin-bonded fixed dental prosthesis, bonding surface of each retainer and cement layer using 3D finite element analysis. The 20 highest stress values were analyzed using two-way ANOVA and post-hoc Tukey test, all with α = 5%. The computational analysis showed that 2-retainer resin-bonded fixed dental prosthesis presented the worst prognosis regardless of the mandibular movement. ANOVA showed that Mandibular movement*Retainer interaction influenced on the tensile and shear stresses values (p < 0.01). Higher stresses were observed in the connector region for all groups (13–82.2 MPa; 11–70.2 MPa). In order to reduce the stress concentration in the resin-bonded fixed dental prosthesis and the retainer made of lithium disilicate, the occlusion may serve as the selection criteria of the unitary abutment for better sustainability.

Original languageEnglish
Article number103389
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume100
DOIs
Publication statusPublished - Dec 2019

Bibliographical note

Publisher Copyright:
© 2019

Keywords

  • Adhesion
  • Bonded retainers
  • Dental materials
  • Finite element analysis
  • Material properties
  • Periodontal ligament
  • Tooth movement

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