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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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Positioning of the loading application point for application of the static 300 N load in the framework
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f01: Positioning of the loading application point for application of the static 300 N load in the framework

Mentions: Eight strain gages (KFG-02-120-C1-11, Strain Gages – Kyowa Electronic Instruments Co., Ltd., Tokyo, Honshu, Japan) were bonded with cyanoacrylate on the surface of the polyurethane model on the distal (D), lingual (L), mesial (M), and buccal (B) sides of implant 1 (distal) and implant 2 (mesial), as can be seen in Figure 1. Strain gauges are able to measure the tension suffered by an object or structure with which it is in close contact. The tension (ε) represents the amount of deformation of a body when submitted to a given force that can be tensile (+) or compressive (-).


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)

Positioning of the loading application point for application of the static 300 N load in the framework
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f01: Positioning of the loading application point for application of the static 300 N load in the framework
Mentions: Eight strain gages (KFG-02-120-C1-11, Strain Gages – Kyowa Electronic Instruments Co., Ltd., Tokyo, Honshu, Japan) were bonded with cyanoacrylate on the surface of the polyurethane model on the distal (D), lingual (L), mesial (M), and buccal (B) sides of implant 1 (distal) and implant 2 (mesial), as can be seen in Figure 1. Strain gauges are able to measure the tension suffered by an object or structure with which it is in close contact. The tension (ε) represents the amount of deformation of a body when submitted to a given force that can be tensile (+) or compressive (-).

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