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. 2022 Oct;17(4):1697-1703.
doi: 10.1016/j.jds.2021.11.018. Epub 2022 Mar 15.

In vitro study of the effect of implant position and attachment type on stress distribution of implant-assisted removable partial dentures

Sai Tun Naing  1 , Manabu Kanazawa  2 , Tamaki Hada  1 , Maiko Iwaki  3 , Yuriko Komagamine  1 , Anna Miyayasu  1 , Yoko Uehara  1 , Shunsuke Minakuchi  1
Affiliations

In vitro study of the effect of implant position and attachment type on stress distribution of implant-assisted removable partial dentures

Sai Tun Naing et al. J Dent Sci. 2022 Oct.

Abstract

Background/purpose: Implant assisted removable partial dentures (IARPDs) improved biomechanical behavior of removable partial dentures (RPDs), but information of the effect of attachment type and implant position is limited. This study aimed to investigate the effect of implant position and attachment type on the stress distribution of IARPDs.

Material and methods: Four implants, 10 mm in length and 4.1 mm in diameter, were bilaterally placed close to first premolar and second molar regions of a mandibular Kennedy class I model having artificial dentition from canine to canine, vertical to the occlusal plane. Five IARPDs were fabricated to accommodate locator and magnetic attachments. Strain gauges were placed on the model surface to measure the strain around implants during loading. Unilateral vertical loading was applied to the right first molar area with magnitude of 120 N and crosshead speed of 10 mm/min. Measurements were recorded under following conditions: premolar IARPDs with locator or magnetic attachments, molar IARPDs with locator or magnetic attachments. Two-way multiple analysis of variance was performed to compare the maximum principal strain (MPS) around the implants with a significance level of 0.05.

Results: Implant position had significant effect on the MPS of IARPD on loading and nonloading sides while attachment type only significant on nonloading side. Molar implants showed larger MPS than premolar implants with both locator and magnetic attachments during unilateral loading.

Conclusion: The stress distribution of the IARPD is significantly affected by implant position wherein anteriorly placed implants exhibit lower MPS than relatively posteriorly placed implants.

Keywords: Dental attachments; Implant position; Implant-assisted removable partial denture; Strain gauge; Stress distribution.

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Conflict of interest statement

The authors have no conflicts of interest relevant to this article.

Figures

Figure 1
Figure 1
(a) Experimental model with implants. (b) IARPD with locator attachment. (c) IARPD with magnetic attachment. IARPD, implant-assisted removable partial denture.
Figure 2
Figure 2
Strain gauges attached to mesial, buccal, distal, and lingual sides of implants.
Figure 3
Figure 3
Vertical loading of experimental model with universal testing machine.
Figure 4
Figure 4
Mean strain and standard error (SE) on loading side under unilateral loading, with significance level of 0.05.
Figure 5
Figure 5
Mean strain and standard error (SE) on nonloading side under unilateral loading, with significance level of 0.05.
Figure 6
Figure 6
Magnitude and direction of MPS in each experimental condition. (A) Premolar IARPD with locator attachment. (B) Molar IARPD with locator attachment. (C) Premolar IARPD with magnetic attachment. (D) Molar IARPD with magnetic attachment. IARPD, implant-assisted removable partial denture; MPS, maximum principal strain.
See this image and copyright information in PMC

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