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Effect of cantilever length and alloy framework on the stress distribution in peri-implant area of cantilevered implant-supported fixed partial dentures.

Suedam V, Moretti Neto RT, Sousa EA, Rubo JH - J Appl Oral Sci (2016)

Bottom Line: Results Two-way ANOVA and Tukey statistical tests were applied showing significant differences (p<0.05) between the groups.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.

View Article: PubMed Central - PubMed

Affiliation: Faculdade de Odontologia, Universidade do Sagrado Coração, Bauru, SP, Brazil.

ABSTRACT
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 (Ø 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 mesial, 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.

No MeSH data available.


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Graphic of the deformation means captured by the strain gauges in CoCr and PdAg alloy groups
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f02: Graphic of the deformation means captured by the strain gauges in CoCr and PdAg alloy groups

Mentions: The final mean deformation and the standard deviation values in each strain gauge are the result of 150 deformation readings. The numerical values obtained are expressed as tension (positive values) and compression (negative values), as seen in Table 1 and represented in Figure 2.


Effect of cantilever length and alloy framework on the stress distribution in peri-implant area of cantilevered implant-supported fixed partial dentures.

Suedam V, Moretti Neto RT, Sousa EA, Rubo JH - J Appl Oral Sci (2016)

Graphic of the deformation means captured by the strain gauges in CoCr and PdAg alloy groups
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4836917&req=5

f02: Graphic of the deformation means captured by the strain gauges in CoCr and PdAg alloy groups
Mentions: The final mean deformation and the standard deviation values in each strain gauge are the result of 150 deformation readings. The numerical values obtained are expressed as tension (positive values) and compression (negative values), as seen in Table 1 and represented in Figure 2.

Bottom Line: Results Two-way ANOVA and Tukey statistical tests were applied showing significant differences (p<0.05) between the groups.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.

View Article: PubMed Central - PubMed

Affiliation: Faculdade de Odontologia, Universidade do Sagrado Coração, Bauru, SP, Brazil.

ABSTRACT
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 (Ø 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 mesial, 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.

No MeSH data available.


Related in: MedlinePlus