J Korean Assoc Oral Maxillofac Surg.  2019 Aug;45(4):199-206. 10.5125/jkaoms.2019.45.4.199.

Evaluation of two interforaminal implants and implant-assisted removable dentures on stress distribution: an in vitro study

• Arat Bilhan S
• Geckili O
• Cilingir A
• Bozdag E
• Bilhan H

• KMID: 2456038
• DOI: http://doi.org/10.5125/jkaoms.2019.45.4.199

Abstract

OBJECTIVES
In mandibular edentulism, the treatment option with a two-interforaminal implant-retained bridge and a removable partial denture is rarely evaluated in literature. The aim of this in vitro study was to evaluate the stress distribution of this treatment option by comparing it with traditional treatment options with interforaminal implants in the edentulous mandible.
MATERIALS AND METHODS
Two interforaminal implants were placed in a formalin-fixed cadaver mandible, and overdentures with three different types of attachments were fabricated: (1) two ball attachments and an overdenture, (2) a Dolder bar and an overdenture, and (3) screw-retained two-implant inter-canine porcelain fused to a metal bridge and an implant-assisted removable denture (IARD) with precision attachments. Three biting conditions were generated for each denture type, and the strains were documented under vertical loading of 100 N.
RESULTS
The calculated strain values from measured strains in all measurement sites and loading conditions for the screw-retained two-implant inter-canine porcelain fused to a metal bridge and a cast framework partial denture with precision attachments situation were lower than in the other scenarios (P<0.05).
CONCLUSION
Within the limitations of the present study, it can be concluded that an IARD may be a reasonable and valuable alternative to ball attachments or a bar in two interforaminal implants, especially when the patients prefer to be able to show their teeth even when they take out their removable dentures.

Keyword

Implant; Strain gauge; Removable denture; Overdenture; Dental

MeSH Terms

Cadaver
Dental Porcelain
Denture, Overlay
Denture, Partial
Denture, Partial, Removable
Dentures*
Humans
In Vitro Techniques*
Mandible
Tooth
Dental Porcelain

Figure

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  Fig. 1 Following the assembly process, all single elements of the rosettes were circuit balanced and shunt calibrated electronically in situ.

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  Fig. 2 A 2-mm-thick polyvinylsiloxane impression material was adapted to the mandible to mimic soft tissue.

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  Fig. 3 The anterior bridge and the bilateral distal extension removable partial denture.

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  Fig. 4 Strain distribution under centric loading measured on all strain gauges. (IARD: implant-assisted removable denture, C: right canine region, BP: buccal shelf left, SM: symphysis midline, RP: right retromolar pad, MRR: right mylohyoid ridge, MRL: left mylohyoid ridge)

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  Fig. 5 Strain distribution under left side loading measured on all strain gauges. (IARD: implant-assisted removable denture, C: right canine region, BP: buccal shelf left, SM: symphysis midline, RP: right retromolar pad, MRR: right mylohyoid ridge, MRL: left mylohyoid ridge)

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  Fig. 6 Strain distribution under right side loading measured on all strain gauges. (IARD: implant-assisted removable denture, C: right canine region, BP: buccal shelf left, SM: symphysis midline, RP: right retromolar pad, MRR: right mylohyoid ridge, MRL: left mylohyoid ridge)

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