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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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Strain diagrams with score label for group CoCr-15mm (a) and PdAg-15mm (b)
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f03: Strain diagrams with score label for group CoCr-15mm (a) and PdAg-15mm (b)

Mentions: A strain diagram was used as a graphic representation of the deformation readings generated on each side of the peri-implant region. This diagram consists of a circular figure in a target shape with scales of 0 me to 7000 me, where readings of deformations generated on the distal, lingual, mesial and buccal sides of each implants of the groups CoCr-15 mm and PdAg-15 mm are visualized (Figure 3). In these diagrams, tensions above to 4000 µε can be seen for the CoCr-15 mm group (D1=-4302.05 me, L1=-5538.95 me); the same occurring with the PdAg-15 mm group (D1=-3960.32 me and L1=-5034.83 me). Based on the literature, these results have shown the two groups presented peri-implant regions within the pathologic overload window, being prone to bone resorption. According to this finding, cantilever arms smaller than 15 mm should be considered during the treatment planning of the mandibular implant-supported fixed partial dentures.


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)

Strain diagrams with score label for group CoCr-15mm (a) and PdAg-15mm (b)
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f03: Strain diagrams with score label for group CoCr-15mm (a) and PdAg-15mm (b)
Mentions: A strain diagram was used as a graphic representation of the deformation readings generated on each side of the peri-implant region. This diagram consists of a circular figure in a target shape with scales of 0 me to 7000 me, where readings of deformations generated on the distal, lingual, mesial and buccal sides of each implants of the groups CoCr-15 mm and PdAg-15 mm are visualized (Figure 3). In these diagrams, tensions above to 4000 µε can be seen for the CoCr-15 mm group (D1=-4302.05 me, L1=-5538.95 me); the same occurring with the PdAg-15 mm group (D1=-3960.32 me and L1=-5034.83 me). Based on the literature, these results have shown the two groups presented peri-implant regions within the pathologic overload window, being prone to bone resorption. According to this finding, cantilever arms smaller than 15 mm should be considered during the treatment planning of the mandibular implant-supported fixed partial dentures.

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