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Stress Distribution in an Implant-Supported Mandibular Complete Denture Using Different Cantilever Lengths and Occlusal Coating Materials

de Medeiros, Rodrigo Antonio DDS, MSc; Goiato, Marcelo Coelho MS, PhD; Pesqueira, Aldiéris Alves MS, PhD; Vechiato Filho, Aljomar José DDS, MS; Bonatto, Liliane da Rocha DDS, MS; dos Santos, Daniela Micheline MS, PhD

doi: 10.1097/ID.0000000000000534
Basic and Clinical Research
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Purpose: The aim of this study was to assess stress distribution in the bone-implant interface of a mandibular implant–supported prosthesis with different cantilever lengths, aesthetic coating materials, and implant abutments.

Materials and Methods: A photoelastic model of an edentulous mandible, containing 5 external hexagon implants, was constructed. Experimental models were divided into 6 groups: group 1—UCLA component and metal bar; group 2—UCLA component and acrylic resin coating; group 3—UCLA component and porcelain coating; group 4—abutment and metal bar; group 5—abutment and acrylic resin coating; and group 6—abutment and porcelain coating. Forces were applied to the most anterior implant, the most posterior implant, and different cantilever lengths.

Results: The results showed a higher number of high-stress fringes as the cantilever length increased. Fringes were better distributed in groups with prostheses composed of acrylic resin and in groups that contained an abutment.

Conclusion: The stress distribution in the bone-implant interface is improved when the cantilever is eliminated and when abutments in an acrylic resin prosthesis are used.

*PhD Student, Department of Dental Materials and Prosthodontics, Aracatuba Dental School, São Paulo State University (UNESP), Aracatuba, Sao Paulo, Brazil.

Professor, Department of Dental Materials and Prosthodontics, Aracatuba Dental School, São Paulo State University (UNESP), Aracatuba, Sao Paulo, Brazil.

Dentist, Private Practice, Cascavel, Parana, Brazil.

Reprint requests and correspondence to: Marcelo Coelho Goiato, MS, PhD, Department of Dental Materials and Prosthodontics, Aracatuba Dental School (UNESP), José Bonifácio, 1193—Vila Mendonça, CEP 16015-050 Aracatuba, São Paulo, Brazil, Phone: 55-18-36363287, Fax: 55-18-36363245, E-mail: goiato@foa.unesp.br

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