J Adv Prosthodont.  2013 Aug;5(3):333-340. 10.4047/jap.2013.5.3.333.

Stress-strain distribution at bone-implant interface of two splinted overdenture systems using 3D finite element analysis

• Hussein MO

• KMID: 2118174
• DOI: http://doi.org/10.4047/jap.2013.5.3.333

Abstract

PURPOSE
This study was accomplished to assess the biomechanical state of different retaining methods of bar implant-overdenture.
MATERIALS AND METHODS
Two 3D finite element models were designed. The first model included implant overdenture retained by Hader-clip attachment, while the second model included two extracoronal resilient attachment (ERA) studs added distally to Hader splint bar. A non-linear frictional contact type was assumed between overdentures and mucosa to represent sliding and rotational movements among different attachment components. A 200 N was applied at the molar region unilaterally and perpendicular to the occlusal plane. Additionally, the mandible was restrained at their ramus ends. The maximum equivalent stress and strain (von Mises) were recorded and analyzed at the bone-implant interface level.
RESULTS
The values of von Mises stress and strain of the first model at bone-implant interface were higher than their counterparts of the second model. Stress concentration and high value of strain were recognized surrounding implant of the unloaded side in both models.
CONCLUSION
There were different patterns of stress-strain distribution at bone-implant interface between the studied attachment designs. Hader bar-clip attachment showed better biomechanical behavior than adding ERA studs distal to hader bar.

Keyword

Implant overdenture; Hader bar; ERA attachment; Finite element analysis; Bone-implant interface

MeSH Terms

Dental Occlusion
Denture, Overlay
Finite Element Analysis
Friction
Mandible
Molar
Mucous Membrane
Splints
Sprains and Strains

Figure

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  Fig. 1 (A) Hader bar connecting implant abutments with attached clip to represent model 1. (B) Two ERA studs and clips added to distal ends of abutments to represent model 2.

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  Fig. 2 The full assembly after meshing with tetrahedron element type.

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  Fig. 3 Boundary condition after adding force and constrains.

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  Fig. 4 (A), (B), (C): showing von Mises stresses of the first model at bone cross section surrounding first implant, second implant and implant surfaces, respectively, (D), (E), (F): showing von Mises stresses of the second model at bone cross section surrounding first implant, second implant and implant surfaces, respectively.

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  Fig. 5 Chart of maximum equivalent stress of bone surrounding implants and surfaces of each implant.

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  Fig. 6 (A), (B), (C): showing von Mises strains of the first model at bone cross section surrounding first implant, second implant and implant surfaces, respectively, (D), (E), (F): showing von Mises strains of the second model at bone cross section surrounding first implant, second implant and implant surfaces, respectively.

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  Fig. 7 Maximum equivalent strains of bone around both implants and surfaces of each implant in both Model 1 and 2.

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