Journal
JOURNAL OF APPLIED ORAL SCIENCE
Volume 24, Issue 2, Pages 114-120Publisher
UNIV SAO PAULO FAC ODONTOLOGIA BAURU
DOI: 10.1590/1678-775720150297
Keywords
Implant-supported dental prosthesis; Dental implants; In vitro techniques; Mechanical stress
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Funding
- CAPES (Coordination of Higher Education and Graduate Training)
- FAPESP (Sao Paulo Research Foundation) [99/01402-6, 05/56182-3]
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Because many mechanical variables are present in the oral cavity, the proper load transfer between the prosthesis and the bone is important for treatment planning and for the longevity of the implant-supported fixed partial denture. Objectives: To verify the stress generated on the peri-implant area of cantilevered implant-supported fixed partial dentures and the potential effects of such variable. Material and Methods: A U-shaped polyurethane model simulating the mandibular bone containing two implants (circle divide 3.75 mm) was used. Six groups were formed according to the alloy's framework (CoCr or PdAg) and the point of load application (5 mm, 10 mm and 15 mm of cantilever arm). A 300 N load was applied in pre-determined reference points. The tension generated on the nnesial, lingual, distal and buccal sides of the peri-implant regions was assessed using strain gauges. Results: Two-way ANOVA and Tukey statistical tests were applied showing significant differences (p<0.05) between the groups. Pearson correlation test (p<0.05) was applied showing positive correlations between the increase of the cantilever arm and the deformation of the peri-implant area. Conclusions: This report demonstrated the CoCr alloy shows larger compression values compared to the PdAg alloy for the same distances of cantilever. The point of load application influences the deformation on the peri-implant area, increasing in accordance with the increase of the lever arm.
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