Influence of margin design and restorative material on the stress distribution of endocrowns: a 3D finite element analysis
Abstract Background This study aimed to evaluate the stress distributions in endocrown restorations as applied to endodontically treated teeth (ETT), according to the factors of “margin design” (four levels) and “restorative material” (six levels). Methods Four 3D-finite elements models were constru...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2022-02-01
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| Series: | BMC Oral Health |
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| Online Access: | https://doi.org/10.1186/s12903-022-02063-y |
| _version_ | 1798023891369590784 |
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| author | Ziting Zheng Jieli Sun Lifang Jiang Yuan Wu Jiahui He Wenhao Ruan Wenjuan Yan |
| author_facet | Ziting Zheng Jieli Sun Lifang Jiang Yuan Wu Jiahui He Wenhao Ruan Wenjuan Yan |
| author_sort | Ziting Zheng |
| collection | DOAJ |
| description | Abstract Background This study aimed to evaluate the stress distributions in endocrown restorations as applied to endodontically treated teeth (ETT), according to the factors of “margin design” (four levels) and “restorative material” (six levels). Methods Four 3D-finite elements models were constructed for endocrown restored molars considering different margin designs. Model A was prepared with a flat butt joint margin and received an endocrown with a 2.0-mm occlusal thickness. Model B was prepared with a 20° bevel margin and received an endocrown with a 2.0-mm occlusal thickness. Model C was prepared with an axial reduction and 1-mm shoulder margin and received an endocrown with a 2.0-mm occlusal thickness. Model D was prepared with an anatomic margin and received an endocrown with a 2.0-mm occlusal thickness. The following endocrown materials were used: In-Ceram Zirconia (Zr), Vita Suprinity (VS), IPS Empress (IE), Grandio blocs (GR), VisCalor bulk (VS), and CopraPeek Light (CP). The Load application (600 N) was performed at the food bolus and tooth surface during the closing phase of the chewing cycle. The results for the endocrown and tooth remnants were determined according to the von Mises stress. The failure risk of the cement layer was also calculated based on the normal stress criterion. Results Model D (with an anatomic margin) showed the greatest stress concentrations, especially in the irregular and sharp angles of the restoration and tooth remnants. The stress concentrated on the dentin was significantly lower in Model B with a 20° bevel margin (20.86 MPa), i.e., 1.3 times lower than the other three margin designs (27.80 MPa). Restorative materials with higher elastic moduli present higher stress concentrations inside the endocrown and transmit less stress to the cement layer, resulting in lower bonding failure risks. In contrast, materials with an elastic modulus similar to that of dentin presented with a more homogeneous stress distribution on the whole structure. Conclusions An endocrown with a 20° bevel margin design could be a favorable preparation option for ETT. Composite resins (GR and VC) exhibit a more even stress distribution, and seem to be more promising materials for endocrown molars. |
| first_indexed | 2024-04-11T17:53:56Z |
| format | Article |
| id | doaj.art-09ac20510f854c20816a78719342f3e3 |
| institution | Directory Open Access Journal |
| issn | 1472-6831 |
| language | English |
| last_indexed | 2024-04-11T17:53:56Z |
| publishDate | 2022-02-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Oral Health |
| spelling | doaj.art-09ac20510f854c20816a78719342f3e32022-12-22T04:10:58ZengBMCBMC Oral Health1472-68312022-02-0122111210.1186/s12903-022-02063-yInfluence of margin design and restorative material on the stress distribution of endocrowns: a 3D finite element analysisZiting Zheng0Jieli Sun1Lifang Jiang2Yuan Wu3Jiahui He4Wenhao Ruan5Wenjuan Yan6Department of Stomatology, Nanfang Hospital, Southern Medical UniversityDepartment of Stomatology, Nanfang Hospital, Southern Medical UniversityDepartment of Stomatology, Nanfang Hospital, Southern Medical UniversityDepartment of Stomatology, Nanfang Hospital, Southern Medical UniversityDepartment of Stomatology, Nanfang Hospital, Southern Medical UniversityDepartment of Stomatology, Nanfang Hospital, Southern Medical UniversityDepartment of Stomatology, Nanfang Hospital, Southern Medical UniversityAbstract Background This study aimed to evaluate the stress distributions in endocrown restorations as applied to endodontically treated teeth (ETT), according to the factors of “margin design” (four levels) and “restorative material” (six levels). Methods Four 3D-finite elements models were constructed for endocrown restored molars considering different margin designs. Model A was prepared with a flat butt joint margin and received an endocrown with a 2.0-mm occlusal thickness. Model B was prepared with a 20° bevel margin and received an endocrown with a 2.0-mm occlusal thickness. Model C was prepared with an axial reduction and 1-mm shoulder margin and received an endocrown with a 2.0-mm occlusal thickness. Model D was prepared with an anatomic margin and received an endocrown with a 2.0-mm occlusal thickness. The following endocrown materials were used: In-Ceram Zirconia (Zr), Vita Suprinity (VS), IPS Empress (IE), Grandio blocs (GR), VisCalor bulk (VS), and CopraPeek Light (CP). The Load application (600 N) was performed at the food bolus and tooth surface during the closing phase of the chewing cycle. The results for the endocrown and tooth remnants were determined according to the von Mises stress. The failure risk of the cement layer was also calculated based on the normal stress criterion. Results Model D (with an anatomic margin) showed the greatest stress concentrations, especially in the irregular and sharp angles of the restoration and tooth remnants. The stress concentrated on the dentin was significantly lower in Model B with a 20° bevel margin (20.86 MPa), i.e., 1.3 times lower than the other three margin designs (27.80 MPa). Restorative materials with higher elastic moduli present higher stress concentrations inside the endocrown and transmit less stress to the cement layer, resulting in lower bonding failure risks. In contrast, materials with an elastic modulus similar to that of dentin presented with a more homogeneous stress distribution on the whole structure. Conclusions An endocrown with a 20° bevel margin design could be a favorable preparation option for ETT. Composite resins (GR and VC) exhibit a more even stress distribution, and seem to be more promising materials for endocrown molars.https://doi.org/10.1186/s12903-022-02063-yEndocrownEndodontically treated teeth3D finite element analysisCeramicComposite resin |
| spellingShingle | Ziting Zheng Jieli Sun Lifang Jiang Yuan Wu Jiahui He Wenhao Ruan Wenjuan Yan Influence of margin design and restorative material on the stress distribution of endocrowns: a 3D finite element analysis BMC Oral Health Endocrown Endodontically treated teeth 3D finite element analysis Ceramic Composite resin |
| title | Influence of margin design and restorative material on the stress distribution of endocrowns: a 3D finite element analysis |
| title_full | Influence of margin design and restorative material on the stress distribution of endocrowns: a 3D finite element analysis |
| title_fullStr | Influence of margin design and restorative material on the stress distribution of endocrowns: a 3D finite element analysis |
| title_full_unstemmed | Influence of margin design and restorative material on the stress distribution of endocrowns: a 3D finite element analysis |
| title_short | Influence of margin design and restorative material on the stress distribution of endocrowns: a 3D finite element analysis |
| title_sort | influence of margin design and restorative material on the stress distribution of endocrowns a 3d finite element analysis |
| topic | Endocrown Endodontically treated teeth 3D finite element analysis Ceramic Composite resin |
| url | https://doi.org/10.1186/s12903-022-02063-y |
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