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Strains around distally inclined implants retaining mandibular overdentures with Locator attachments: an in vitro study

PURPOSE: The aim of the present study was to evaluate, by means of strain gauge analysis, the effect of different implant angulations on strains around two implants retaining mandibular overdenture with Locator attachments. MATERIALS AND METHODS: Four duplicate mandibular acrylic models were constru...

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Autores principales: Elsyad, Moustafa Abdou, Setta, Fathi Abo, Khirallah, Ahmed Samir
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Korean Academy of Prosthodontics 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4852263/
https://www.ncbi.nlm.nih.gov/pubmed/27141255
http://dx.doi.org/10.4047/jap.2016.8.2.116
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author Elsyad, Moustafa Abdou
Setta, Fathi Abo
Khirallah, Ahmed Samir
author_facet Elsyad, Moustafa Abdou
Setta, Fathi Abo
Khirallah, Ahmed Samir
author_sort Elsyad, Moustafa Abdou
collection PubMed
description PURPOSE: The aim of the present study was to evaluate, by means of strain gauge analysis, the effect of different implant angulations on strains around two implants retaining mandibular overdenture with Locator attachments. MATERIALS AND METHODS: Four duplicate mandibular acrylic models were constructed. Two implants were inserted in the canine regions using the following degrees of distal inclinations: group I (control); 0°, group II; 10°, group III; 20°, and group IV; 30°. Locator pink attachments were used to connect the overdenture to the implants and Locator red (designed for severely angled implants) was used for group IV (group IV(red)). For each group, two linear strain gauges were attached at the mesial and distal surfaces of the acrylic resin around each implant. Peri-implant strain was measured on loading and non-loading sides during bilateral and unilateral loading. RESULTS: For all groups, the mesial surfaces of the implants at loading and non-loading sides experienced compressive (negative) strains, while the distal implant surfaces showed tensile (positive) strains. Group IV showed the highest strain, followed by group III, group II. Both group I and group IV(red) showed the lowest strain. The strain gauges at the mesial surface of the loading side recorded the highest strain, and the distal surface at non-loading side showed the lowest strain. Unilateral loading recorded significantly higher strain than bilateral loading. CONCLUSION: Peri-implant strains around two implants used to retain mandibular overdentures with Locator attachments increase as distal implant inclination increases, except when red nylon inserts were used.
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spelling pubmed-48522632016-05-02 Strains around distally inclined implants retaining mandibular overdentures with Locator attachments: an in vitro study Elsyad, Moustafa Abdou Setta, Fathi Abo Khirallah, Ahmed Samir J Adv Prosthodont Original Article PURPOSE: The aim of the present study was to evaluate, by means of strain gauge analysis, the effect of different implant angulations on strains around two implants retaining mandibular overdenture with Locator attachments. MATERIALS AND METHODS: Four duplicate mandibular acrylic models were constructed. Two implants were inserted in the canine regions using the following degrees of distal inclinations: group I (control); 0°, group II; 10°, group III; 20°, and group IV; 30°. Locator pink attachments were used to connect the overdenture to the implants and Locator red (designed for severely angled implants) was used for group IV (group IV(red)). For each group, two linear strain gauges were attached at the mesial and distal surfaces of the acrylic resin around each implant. Peri-implant strain was measured on loading and non-loading sides during bilateral and unilateral loading. RESULTS: For all groups, the mesial surfaces of the implants at loading and non-loading sides experienced compressive (negative) strains, while the distal implant surfaces showed tensile (positive) strains. Group IV showed the highest strain, followed by group III, group II. Both group I and group IV(red) showed the lowest strain. The strain gauges at the mesial surface of the loading side recorded the highest strain, and the distal surface at non-loading side showed the lowest strain. Unilateral loading recorded significantly higher strain than bilateral loading. CONCLUSION: Peri-implant strains around two implants used to retain mandibular overdentures with Locator attachments increase as distal implant inclination increases, except when red nylon inserts were used. The Korean Academy of Prosthodontics 2016-04 2016-04-21 /pmc/articles/PMC4852263/ /pubmed/27141255 http://dx.doi.org/10.4047/jap.2016.8.2.116 Text en © 2016 The Korean Academy of Prosthodontics http://creativecommons.org/licenses/by-nc/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Elsyad, Moustafa Abdou
Setta, Fathi Abo
Khirallah, Ahmed Samir
Strains around distally inclined implants retaining mandibular overdentures with Locator attachments: an in vitro study
title Strains around distally inclined implants retaining mandibular overdentures with Locator attachments: an in vitro study
title_full Strains around distally inclined implants retaining mandibular overdentures with Locator attachments: an in vitro study
title_fullStr Strains around distally inclined implants retaining mandibular overdentures with Locator attachments: an in vitro study
title_full_unstemmed Strains around distally inclined implants retaining mandibular overdentures with Locator attachments: an in vitro study
title_short Strains around distally inclined implants retaining mandibular overdentures with Locator attachments: an in vitro study
title_sort strains around distally inclined implants retaining mandibular overdentures with locator attachments: an in vitro study
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4852263/
https://www.ncbi.nlm.nih.gov/pubmed/27141255
http://dx.doi.org/10.4047/jap.2016.8.2.116
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