78060

Effect of material on stress transmission to the supporting structures in Kennedy Class I restored by Telescopic-retained Removable Partial Denture. (Strain Gauge Study)

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Last updated: 01 Jan 2025

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Abstract

Objectives: The aim of this in-vitro study was to compare the stresses transmitted to the abutments in mandibular Kennedy class I restored with telescopic-retained removable partial denture (RPD) made from two different materials; PolyEther Ether Ketone (PEEK) and Co-Cr alloy.
Materials and Methods: One mandibular model representing Kennedy class I, with second premolars as the last standing abutments, was fabricated using epoxy resin. Poly Vinyl Siloxane (PVS) impression material was used to simulate the mucosa and the periodontal ligament. The acrylic first and second premolar teeth bilaterally were prepared to receive primary telescopic copings. The latter and two removable partial denture (RPD) frameworks were fabricated out of PEEK and Co-Cr alloy. The 2 frameworks were then processed into fully finished RPDs using heat cured acrylic resin and acrylic teeth following the conventional techniques. Four strain gauges were installed in the epoxy resin model 1 mm mesial to the socket of the 1st premolar and 1 mm distal to that of the 2nd premolar, on the right and left sides respectively; channel 1, 2, 3 and 4. A load of 100 N was applied to the area of the first molar unilaterally on the right side and then bilaterally. The same procedure was repeated six times. Data on stresses were then collected, tabulated and statistically analyzed using one-way ANOVA and Tukey HSD Test (P≤0.05).
Results: In the unilateral loading condition, the highest compressive micro-strains were recorded at channel 3 for the Co-Cr alloy-group (-40±3.16 µm/m). While the least compressive micro-strains were recorded at channel 3 for the PEEK-group (-10±3.16 µm/m). The highest tensile micro-strains were recorded at channel 2 for the PEEK-group (540±10 µm/m). While the least tensile micro-strains were recorded at channel 4 for the PEEK-group (15±4.47 µm/m). In the bilateral loading condition, the highest tensile micro-strains were recorded at channel 2 for the PEEK-group (355±11.83 µm/m). While the least tensile micro-strains were recorded at the same channel for the Co-Cr alloy-group (50±3.16 µm/m). The highest compressive micro-strains were recorded at channel 1 for the PEEK-group (-170±11.4 µm/m). While the least compressive micro-strains were recorded at channel 3 for the Co-Cr alloy-group (-95±8.94 µm/m). Conclusions: The distal abutments always receive the highest stresses, regardless of the loading conditions and the materials from which the prosthesis was fabricated. Telescopic-retained RPD with metallic frameworks generate less strain to the supporting structures in Kennedy Class I compared to those with PEEK frameworks. The bilaterally applied force resulted in more favorable stress distribution pattern when compared to the unilateral one.

DOI

10.21608/edj.2018.78060

Keywords

PEEK, strain-gauge, telescopic-retained RPD, Kennedy Class I, abutment

Authors

First Name

Sherif

Last Name

Bahgat

MiddleName

Fayez Ahmed

Affiliation

Lecturer, Fixed Prosthodontics Department, Faculty of Dentistry, October University for Modern Sciences and Arts, Cairo, Egypt

Email

drsherifbahgat@hotmail.com

City

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Orcid

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First Name

Mahmoud

Last Name

El Homossany

MiddleName

El Moutassim Bellah

Affiliation

Lecturer, Removable Prosthodontics Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt

Email

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Volume

64

Article Issue

Issue 1 - January (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)

Related Issue

11444

Issue Date

2018-01-01

Receive Date

2020-03-18

Publish Date

2018-01-01

Page Start

559

Page End

573

Print ISSN

0070-9484

Online ISSN

2090-2360

Link

https://edj.journals.ekb.eg/article_78060.html

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https://edj.journals.ekb.eg/service?article_code=78060

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26

Type

Original Article

Type Code

254

Publication Type

Journal

Publication Title

Egyptian Dental Journal

Publication Link

https://edj.journals.ekb.eg/

MainTitle

Effect of material on stress transmission to the supporting structures in Kennedy Class I restored by Telescopic-retained Removable Partial Denture. (Strain Gauge Study)

Details

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Article

Created At

22 Jan 2023