title: Basic Finite Element Analysis of Para-periodontal Ligament in All-ceramic Zirconia Fixed Partial Denture.
abstract: The purpose of the present study was to investigate the validity of incorporating a para-periodontal ligament in the test mold used in a basic fracture test of a zirconia all-ceramic fixed partial denture (FPD). A simplified three-dimensional finite element analysis model was designed based on the three-unit FPD fracture test. Two types of model, one with and one without a para-periodontal ligament between the abutment and base mold, were fabricated. Microfocus CT of the missing first molar area in a dry human mandible was performed. A three-dimensional model was then fabricated based on the data obtained. A load of 600 N was applied to the center of the pontic and stress distribution observed. The model with the para-periodontal ligament showed stress dispersion to the dental root with rotation of the abutment mold. Stress distribution in the finite element analysis model with a para-periodontal ligament showed greater similarity with that in the mandibular model than with that in the other two models without a para-periodontal ligament.
authors.affiliation: Department of Fixed Prosthodontics, Tokyo Dental College.
authors.forename: Syuntaro
authors.initials: S
authors.lastname: Nomoto
authors.forename: Satoru
authors.initials: S
authors.lastname: Matsunaga
authors.forename: Toru
authors.initials: T
authors.lastname: Sato
authors.forename: Mamoru
authors.initials: M
authors.lastname: Yotsuya
authors.forename: Shinichi
authors.initials: S
authors.lastname: Abe
mesh_terms: D002516:Ceramics; D000044:Dental Abutments; D003799:Dental Stress Analysis; D003779:Denture Design; D003830:Denture, Partial, Fixed; D020342:Finite Element Analysis; D006801:Humans; D010513:Periodontal Ligament; D013314:Stress, Mechanical