RESUMO
The loss of one or more teeth is normally treated with conventional fixed or removable partial dentures or with implant supported fixed or removable dentures. This study investigated stresses formed around the implant and the antagonist natural tooth under occlusal force in the substitution of a missing lower first molar with a rigid or resilient IMZ (Intra Mobil Zylinder) implant, using the finite element stress analysis method. The results indicate that a bite force of 143 N resulted in high compressive stresses around the roots of a natural tooth opposing a restoration supported by an IMZ implant with rigid type abutment. It is speculated that these high compressive stresses may contribute to intrusion of the tooth.
Assuntos
Implantes Dentários , Oclusão Dentária , Análise do Estresse Dentário/métodos , Dente/fisiologia , Força de Mordida , Simulação por Computador , Implantes Dentários/estatística & dados numéricos , Análise do Estresse Dentário/estatística & dados numéricos , Análise de Elementos Finitos/estatística & dados numéricos , Humanos , Modelos Biológicos , Estresse Mecânico , Ápice Dentário/fisiologia , Colo do Dente/fisiologiaRESUMO
Stress and strain patterns around two rigid implant designs used as an abutment were compared and the displacement of natural teeth was investigated. The finite-element method was utilized to determine the stress and strain distributions. The results were evaluated in terms of the maximal tensile and compressive stress and strain in the bone around the abutment tooth and implants. The results indicated that the ITI 1 (hollow screw) implant led to high stress concentrations particularly in the apical region. The stress-transferring characteristics of ITI 2 (solid screw) implant were found to be more suitable than were those of ITI 1.
