Effect of different restorative design and materials on stress distribution in cracked teeth: a finite element analysis study
Abstract Objectives To compare the stress distribution and crack propagation in cracked mandibular first molar restored with onlay, overlay, and two types of occlusal veneers using two different CAD/CAM materials by Finite Element Analysis (FEA). Materials and methods A mandibular first molar was di...
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| Format: | Article |
| Language: | English |
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BMC
2025-01-01
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| Series: | BMC Oral Health |
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| Online Access: | https://doi.org/10.1186/s12903-024-05122-8 |
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| author | Ting Liu Yinghao Huang Yue Li Jiali Meng Yajing Liu Yuan Wei Yequan Huang Qian Zhou Weidong Yang Fuhua Yan Xiang Wang Yanan Zhu |
| author_facet | Ting Liu Yinghao Huang Yue Li Jiali Meng Yajing Liu Yuan Wei Yequan Huang Qian Zhou Weidong Yang Fuhua Yan Xiang Wang Yanan Zhu |
| author_sort | Ting Liu |
| collection | DOAJ |
| description | Abstract Objectives To compare the stress distribution and crack propagation in cracked mandibular first molar restored with onlay, overlay, and two types of occlusal veneers using two different CAD/CAM materials by Finite Element Analysis (FEA). Materials and methods A mandibular first molar was digitized using a micro CT scanning system in 2023. Three-dimensional dynamic scan data were transformed, and a 3D model of a cracked tooth was generated. Finite element models of four different models (onlay, overlay, and two types of occlusal veneer restored teeth) were designed. Two different CAD/CAM materials, including Lava Ultimate (LU) and IPS e.max CAD (EMX), were specified for both models. Each model was subjected to three different force loads on the occlusal surfaces. Stress distribution patterns and the maximum von Mises (VM) stresses were calculated and compared. Results Compared to the base model, all restorations showed that high-stress concentration moved from the lower margin of the crack area towards the top of the crack area. The EMX-restored onlay, overlay, and occlusal veneer 2 had the lower stress in the cracked area and the lower average von Mises stress levels at the lower margin along the cracked line, especially under the 225N lateral force (P < 0.05). The occlusal veneer 1 filled with resin had a poorer stress distribution and higher stress concentration of stress at the remaining crack than the occlusal veneer 2 without resin filled inside. Conclusions The EMX restorations with onlay, overlay, and occlusal veneer 2 showed lower stress concentration at the lower margin of crack surface compared to the LU-restored models. The occlusal veneer with internal resin filler exhibited higher stress on the end of the lower margin of the crack surface. Clinical relevance Our results suggest that onlay, overlay ceramic restorations and occlusal veneer (without resin filling inside) may be a favorable method to prevent further crack propagation. Trial registration A protocol was specified and registered with the Chinese Clinical Trial Registry (ChiCTR) on 2022–04-12 (registration number: ChiCTR2200058630). |
| format | Article |
| id | doaj-art-54bed1ebee15452aaf2f1bb1aa5570a8 |
| institution | Kabale University |
| issn | 1472-6831 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Oral Health |
| spelling | doaj-art-54bed1ebee15452aaf2f1bb1aa5570a82025-01-12T12:42:15ZengBMCBMC Oral Health1472-68312025-01-0125111710.1186/s12903-024-05122-8Effect of different restorative design and materials on stress distribution in cracked teeth: a finite element analysis studyTing Liu0Yinghao Huang1Yue Li2Jiali Meng3Yajing Liu4Yuan Wei5Yequan Huang6Qian Zhou7Weidong Yang8Fuhua Yan9Xiang Wang10Yanan Zhu11Nanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing UniversityNanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing UniversityNanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing UniversityNanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing UniversityNanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing UniversityNanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing UniversityNanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing UniversityNanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing UniversityNanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing UniversityNanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing UniversityNanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing UniversityNanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing UniversityAbstract Objectives To compare the stress distribution and crack propagation in cracked mandibular first molar restored with onlay, overlay, and two types of occlusal veneers using two different CAD/CAM materials by Finite Element Analysis (FEA). Materials and methods A mandibular first molar was digitized using a micro CT scanning system in 2023. Three-dimensional dynamic scan data were transformed, and a 3D model of a cracked tooth was generated. Finite element models of four different models (onlay, overlay, and two types of occlusal veneer restored teeth) were designed. Two different CAD/CAM materials, including Lava Ultimate (LU) and IPS e.max CAD (EMX), were specified for both models. Each model was subjected to three different force loads on the occlusal surfaces. Stress distribution patterns and the maximum von Mises (VM) stresses were calculated and compared. Results Compared to the base model, all restorations showed that high-stress concentration moved from the lower margin of the crack area towards the top of the crack area. The EMX-restored onlay, overlay, and occlusal veneer 2 had the lower stress in the cracked area and the lower average von Mises stress levels at the lower margin along the cracked line, especially under the 225N lateral force (P < 0.05). The occlusal veneer 1 filled with resin had a poorer stress distribution and higher stress concentration of stress at the remaining crack than the occlusal veneer 2 without resin filled inside. Conclusions The EMX restorations with onlay, overlay, and occlusal veneer 2 showed lower stress concentration at the lower margin of crack surface compared to the LU-restored models. The occlusal veneer with internal resin filler exhibited higher stress on the end of the lower margin of the crack surface. Clinical relevance Our results suggest that onlay, overlay ceramic restorations and occlusal veneer (without resin filling inside) may be a favorable method to prevent further crack propagation. Trial registration A protocol was specified and registered with the Chinese Clinical Trial Registry (ChiCTR) on 2022–04-12 (registration number: ChiCTR2200058630).https://doi.org/10.1186/s12903-024-05122-8Finite element analysisCracked toothRestoration designOcclusal veneerMechanical properties |
| spellingShingle | Ting Liu Yinghao Huang Yue Li Jiali Meng Yajing Liu Yuan Wei Yequan Huang Qian Zhou Weidong Yang Fuhua Yan Xiang Wang Yanan Zhu Effect of different restorative design and materials on stress distribution in cracked teeth: a finite element analysis study BMC Oral Health Finite element analysis Cracked tooth Restoration design Occlusal veneer Mechanical properties |
| title | Effect of different restorative design and materials on stress distribution in cracked teeth: a finite element analysis study |
| title_full | Effect of different restorative design and materials on stress distribution in cracked teeth: a finite element analysis study |
| title_fullStr | Effect of different restorative design and materials on stress distribution in cracked teeth: a finite element analysis study |
| title_full_unstemmed | Effect of different restorative design and materials on stress distribution in cracked teeth: a finite element analysis study |
| title_short | Effect of different restorative design and materials on stress distribution in cracked teeth: a finite element analysis study |
| title_sort | effect of different restorative design and materials on stress distribution in cracked teeth a finite element analysis study |
| topic | Finite element analysis Cracked tooth Restoration design Occlusal veneer Mechanical properties |
| url | https://doi.org/10.1186/s12903-024-05122-8 |
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