Influence of Orbital Implant Length and Diameter on Stress Distribution: A Finite Element Analysis
Identifieur interne : 000746 ( Main/Exploration ); précédent : 000745; suivant : 000747Influence of Orbital Implant Length and Diameter on Stress Distribution: A Finite Element Analysis
Auteurs : Zhang Xing ; Ling Song Chen [République populaire de Chine] ; Wei Peng [République populaire de Chine] ; Ling Jian ChenSource :
- The Journal of Craniofacial Surgery [ 1049-2275 ] ; 2016.
Abstract
A mathematical simulation of stress distribution around orbital implants was used to determine which length and diameter of implants would be best to dissipate stress.
An integrated system for computed tomography data was utilized to create a 3-dimensional model of craniofacial structures. The model simulated implants placed in the 7, 11, and 12 o’clock positions of the orbital rim. A load of 2 N was applied to the model along the long axis of the implant (model 1) and an angle of 45° with the long axis of the implant (model 2). A model simulating an implant with a diameter of 3.75 mm and lengths of 3, 4, 6, 8, and 10 mm was developed to investigate the influence of the length factor. The influence of different diameters was modeled using implants with a length of 6 mm and diameters of 3.0, 3.75, 4.2, 5.0, and 6.0 mm. Values of von Mises equivalent stress at the implant–bone interface were computed using the finite element analysis for all variations.
The elements exposed to the maximum stress were located around the root of the orbital implant in model 1 or between the neck and the first thread of the orbital implant in model 2. An increase in the orbital implant diameter led to a decrease in the maximum von Mises equivalent stress values. In model 1, the reductions were 45.2% (diameter of 3.0–3.75 mm), 25.3% (diameter of 3.75–4.2 mm), 17.2% (diameter of 4.2–5.0 mm), and 5.4% (diameter of 5.0–6.0 mm). In model 2, the reductions of the maximum stress values were 51.9%, 35.4%, 19.7%, and 8.1% respectively. However, the influence of orbital implant length was not as pronounced as that of diameter. In model 1, the reductions were 28.8% (length of 3–4 mm), 19.2% (length of 4–6 mm), 9.6% (length of 6–8 mm), and 4.3% (length of 8–10 mm). In model 2, the reductions of the maximum stress values were 35.5%, 21.1%, 10.9%, and 5.4% respectively.
An increase in the implant diameter decreased the maximum von Mises equivalent stress around the orbital implant more than an increase in the implant length. From a biomechanical perspective, the optimum choice was an orbital implant with no less than 4.2 mm diameter allowed by the anatomy.
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DOI: 10.1097/SCS.0000000000003305
PubMed: 28005657
PubMed Central: 5367500
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First Affiliated Hospital, Sun Yat-sen University, Guangzhou</wicri:regionArea><placeName><settlement type="city">Jiangmen</settlement><region type="province">Guangdong</region></placeName></affiliation></author><author><name sortKey="Peng, Wei" sort="Peng, Wei" uniqKey="Peng W" first="Wei" last="Peng">Wei Peng</name><affiliation wicri:level="3"><nlm:aff id="aff2">Department of Oral and Maxillofacial Surgery, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.</nlm:aff><country xml:lang="fr" wicri:curation="lc">République populaire de Chine</country><wicri:regionArea>Department of Oral and Maxillofacial Surgery, First Affiliated Hospital, Sun Yat-sen University, Guangzhou</wicri:regionArea><placeName><settlement type="city">Jiangmen</settlement><region type="province">Guangdong</region></placeName></affiliation></author><author><name sortKey="Chen, Ling Jian" sort="Chen, Ling Jian" uniqKey="Chen L" first="Ling Jian" last="Chen">Ling Jian Chen</name><affiliation><nlm:aff id="aff1">Department of Stomatology, Guangdong Provincial Hospital of Traditional Chinese Medicine</nlm:aff><wicri:noCountry code="subfield">Guangdong Provincial Hospital of Traditional Chinese Medicine</wicri:noCountry></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">28005657</idno><idno type="pmc">5367500</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5367500</idno><idno type="RBID">PMC:5367500</idno><idno type="doi">10.1097/SCS.0000000000003305</idno><date when="2016">2016</date><idno type="wicri:Area/Pmc/Corpus">003057</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">003057</idno><idno type="wicri:Area/Pmc/Curation">003057</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Curation">003057</idno><idno type="wicri:Area/Pmc/Checkpoint">000636</idno><idno type="wicri:explorRef" wicri:stream="Pmc" 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Medicine</wicri:noCountry></affiliation></author><author><name sortKey="Chen, Ling Song" sort="Chen, Ling Song" uniqKey="Chen L" first="Ling Song" last="Chen">Ling Song Chen</name><affiliation wicri:level="3"><nlm:aff id="aff2">Department of Oral and Maxillofacial Surgery, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.</nlm:aff><country xml:lang="fr" wicri:curation="lc">République populaire de Chine</country><wicri:regionArea>Department of Oral and Maxillofacial Surgery, First Affiliated Hospital, Sun Yat-sen University, Guangzhou</wicri:regionArea><placeName><settlement type="city">Jiangmen</settlement><region type="province">Guangdong</region></placeName></affiliation></author><author><name sortKey="Peng, Wei" sort="Peng, Wei" uniqKey="Peng W" first="Wei" last="Peng">Wei Peng</name><affiliation wicri:level="3"><nlm:aff id="aff2">Department of Oral and Maxillofacial Surgery, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.</nlm:aff><country xml:lang="fr" wicri:curation="lc">République populaire de Chine</country><wicri:regionArea>Department of Oral and Maxillofacial Surgery, First Affiliated Hospital, Sun Yat-sen University, Guangzhou</wicri:regionArea><placeName><settlement type="city">Jiangmen</settlement><region type="province">Guangdong</region></placeName></affiliation></author><author><name sortKey="Chen, Ling Jian" sort="Chen, Ling Jian" uniqKey="Chen L" first="Ling Jian" last="Chen">Ling Jian Chen</name><affiliation><nlm:aff id="aff1">Department of Stomatology, Guangdong Provincial Hospital of Traditional Chinese Medicine</nlm:aff><wicri:noCountry code="subfield">Guangdong Provincial Hospital of Traditional Chinese Medicine</wicri:noCountry></affiliation></author></analytic><series><title level="j">The Journal of Craniofacial Surgery</title><idno type="ISSN">1049-2275</idno><idno type="eISSN">1536-3732</idno><imprint><date when="2016">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Purpose:</title><p>A mathematical simulation of stress distribution around orbital implants was used to determine which length and diameter of implants would be best to dissipate stress.</p></sec><sec sec-type="methods"><title>Methods:</title><p>An integrated system for computed tomography data was utilized to create a 3-dimensional model of craniofacial structures. The model simulated implants placed in the 7, 11, and 12 o’clock positions of the orbital rim. A load of 2 N was applied to the model along the long axis of the implant (model 1) and an angle of 45° with the long axis of the implant (model 2). A model simulating an implant with a diameter of 3.75 mm and lengths of 3, 4, 6, 8, and 10 mm was developed to investigate the influence of the length factor. The influence of different diameters was modeled using implants with a length of 6 mm and diameters of 3.0, 3.75, 4.2, 5.0, and 6.0 mm. Values of von Mises equivalent stress at the implant–bone interface were computed using the finite element analysis for all variations.</p></sec><sec sec-type="results"><title>Results:</title><p>The elements exposed to the maximum stress were located around the root of the orbital implant in model 1 or between the neck and the first thread of the orbital implant in model 2. An increase in the orbital implant diameter led to a decrease in the maximum von Mises equivalent stress values. In model 1, the reductions were 45.2% (diameter of 3.0–3.75 mm), 25.3% (diameter of 3.75–4.2 mm), 17.2% (diameter of 4.2–5.0 mm), and 5.4% (diameter of 5.0–6.0 mm). In model 2, the reductions of the maximum stress values were 51.9%, 35.4%, 19.7%, and 8.1% respectively. However, the influence of orbital implant length was not as pronounced as that of diameter. In model 1, the reductions were 28.8% (length of 3–4 mm), 19.2% (length of 4–6 mm), 9.6% (length of 6–8 mm), and 4.3% (length of 8–10 mm). In model 2, the reductions of the maximum stress values were 35.5%, 21.1%, 10.9%, and 5.4% respectively.</p></sec><sec sec-type="conclusion"><title>Conclusions:</title><p>An increase in the implant diameter decreased the maximum von Mises equivalent stress around the orbital implant more than an increase in the implant length. 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Kilgren</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Lim, Sa" uniqKey="Lim S">SA Lim</name></author><author><name sortKey="Cha, Jy" uniqKey="Cha J">JY Cha</name></author><author><name sortKey="Hwang, Cj" uniqKey="Hwang C">CJ Hwang</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Goodacre, Cj" uniqKey="Goodacre C">CJ Goodacre</name></author><author><name sortKey="Kan, Jy" uniqKey="Kan J">JY Kan</name></author><author><name sortKey="Rungcharassaeng, K" uniqKey="Rungcharassaeng K">K Rungcharassaeng</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Meijer, Hj" uniqKey="Meijer H">HJ Meijer</name></author><author><name sortKey="Starmans, Fj" uniqKey="Starmans F">FJ Starmans</name></author><author><name sortKey="Steen, Wh" uniqKey="Steen W">WH Steen</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Matsuura M1" uniqKey="Matsuura M1">Matsuura M1</name></author><author><name sortKey="Ohno, K" uniqKey="Ohno K">K Ohno</name></author><author><name sortKey="Michi, K" uniqKey="Michi K">K Michi</name></author></analytic></biblStruct></listBibl></div1></back></TEI><affiliations><list><country><li>République populaire de Chine</li></country><region><li>Guangdong</li></region><settlement><li>Jiangmen</li></settlement></list><tree><noCountry><name sortKey="Chen, Ling Jian" sort="Chen, Ling Jian" uniqKey="Chen L" first="Ling Jian" last="Chen">Ling Jian Chen</name><name sortKey="Xing, Zhang" sort="Xing, Zhang" uniqKey="Xing Z" first="Zhang" last="Xing">Zhang Xing</name></noCountry><country name="République populaire de Chine"><region name="Guangdong"><name sortKey="Chen, Ling Song" sort="Chen, Ling Song" uniqKey="Chen L" first="Ling Song" last="Chen">Ling Song Chen</name></region><name sortKey="Peng, Wei" sort="Peng, Wei" uniqKey="Peng W" first="Wei" last="Peng">Wei Peng</name></country></tree></affiliations></record>Pour manipuler ce 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