The effects of splinting periodontally compromised removable partial denture abutments on bone stresses: a three-dimensional finite element study
Periodontally compromised abutments complicate the treatment plan of distal extension removable partial dentures. The objectives of this study were: (1) to determine if splinting a tooth with reduced bone height to a healthy one is beneficial to the weak one; (2) to investigate fixed splinting of tw...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2010-03-01
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| Series: | Journal of Dental Sciences |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1991790210600013 |
| _version_ | 1818898417360830464 |
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| author | Allahyar Geramy Mehdi Adibrad Mahasti Sahabi |
| author_facet | Allahyar Geramy Mehdi Adibrad Mahasti Sahabi |
| author_sort | Allahyar Geramy |
| collection | DOAJ |
| description | Periodontally compromised abutments complicate the treatment plan of distal extension removable partial dentures. The objectives of this study were: (1) to determine if splinting a tooth with reduced bone height to a healthy one is beneficial to the weak one; (2) to investigate fixed splinting of two teeth (the first and second premolars) with various alveolar support levels on bone stress around the periodontal construction according to different crown to root ratios of the periodontally compromised abutment; and (3) to assess the efficiency of splinting in the presence of non-axial loads.
Materials and methods: Thirteen three-dimensional finite element models were designed that included the mandibular first and second premolars and the surrounding bone. Ten models were similar except for the alveolar bone height around the second premolar that had different amounts of bone resorption of 0-9 mm with splinted teeth. The last three were the same except for the teeth which were not splinted. A vertical force of 25 N was applied to each occlusal surface of the premolars. Finally, von Mises stress was evaluated at three points for all models. In the first stage, the efficiency of splinting was assessed. In the last stage, the effects of non-axial loads were evaluated in the splinted teeth models.
Results: In stage 1, it was shown that splinting could redirect the stresses to apical areas and prevented crestal bone from increased stress. In stage 2, the findings of von Mises stress in the apical area of the first premolar were almost the same in all models. In the apical area of the second premolar and the alveolar crest area, the bone stress increased when the height of the alveolar bone of the second premolar decreased. Stage 3 revealed that splinted teeth are efficient in carrying non-axial loads.
Conclusion: Splinting a very weak abutment to an adjacent healthy tooth might not be beneficial. The acceptable crown to root ratio for fixed splinting a weak abutment to an adjacent normal tooth was around 1.65-2. |
| first_indexed | 2024-12-19T19:31:44Z |
| format | Article |
| id | doaj.art-aedaafe0b26d4a2182b8f3208ef97bcb |
| institution | Directory Open Access Journal |
| issn | 1991-7902 |
| language | English |
| last_indexed | 2024-12-19T19:31:44Z |
| publishDate | 2010-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Dental Sciences |
| spelling | doaj.art-aedaafe0b26d4a2182b8f3208ef97bcb2022-12-21T20:08:34ZengElsevierJournal of Dental Sciences1991-79022010-03-01511710.1016/S1991-7902(10)60001-3The effects of splinting periodontally compromised removable partial denture abutments on bone stresses: a three-dimensional finite element studyAllahyar Geramy0Mehdi Adibrad1Mahasti Sahabi2Department of Orthodontics, Dental School, Tehran University of Medical Science and Dental Research Center, Tehran University of Medical Sciences, Tehran, IranDepartment of Periodontics, Dental School, Isfahan University of Medical Science, Isfahan, IranDepartment of Prosthodontics, Dental School, Shahid Beheshti University of Medical Science, Tehran, IranPeriodontally compromised abutments complicate the treatment plan of distal extension removable partial dentures. The objectives of this study were: (1) to determine if splinting a tooth with reduced bone height to a healthy one is beneficial to the weak one; (2) to investigate fixed splinting of two teeth (the first and second premolars) with various alveolar support levels on bone stress around the periodontal construction according to different crown to root ratios of the periodontally compromised abutment; and (3) to assess the efficiency of splinting in the presence of non-axial loads. Materials and methods: Thirteen three-dimensional finite element models were designed that included the mandibular first and second premolars and the surrounding bone. Ten models were similar except for the alveolar bone height around the second premolar that had different amounts of bone resorption of 0-9 mm with splinted teeth. The last three were the same except for the teeth which were not splinted. A vertical force of 25 N was applied to each occlusal surface of the premolars. Finally, von Mises stress was evaluated at three points for all models. In the first stage, the efficiency of splinting was assessed. In the last stage, the effects of non-axial loads were evaluated in the splinted teeth models. Results: In stage 1, it was shown that splinting could redirect the stresses to apical areas and prevented crestal bone from increased stress. In stage 2, the findings of von Mises stress in the apical area of the first premolar were almost the same in all models. In the apical area of the second premolar and the alveolar crest area, the bone stress increased when the height of the alveolar bone of the second premolar decreased. Stage 3 revealed that splinted teeth are efficient in carrying non-axial loads. Conclusion: Splinting a very weak abutment to an adjacent healthy tooth might not be beneficial. The acceptable crown to root ratio for fixed splinting a weak abutment to an adjacent normal tooth was around 1.65-2.http://www.sciencedirect.com/science/article/pii/S1991790210600013abutmentbiomechanicsfinite element analysisfixed splintingperiodontal supportremovable partial denture |
| spellingShingle | Allahyar Geramy Mehdi Adibrad Mahasti Sahabi The effects of splinting periodontally compromised removable partial denture abutments on bone stresses: a three-dimensional finite element study Journal of Dental Sciences abutment biomechanics finite element analysis fixed splinting periodontal support removable partial denture |
| title | The effects of splinting periodontally compromised removable partial denture abutments on bone stresses: a three-dimensional finite element study |
| title_full | The effects of splinting periodontally compromised removable partial denture abutments on bone stresses: a three-dimensional finite element study |
| title_fullStr | The effects of splinting periodontally compromised removable partial denture abutments on bone stresses: a three-dimensional finite element study |
| title_full_unstemmed | The effects of splinting periodontally compromised removable partial denture abutments on bone stresses: a three-dimensional finite element study |
| title_short | The effects of splinting periodontally compromised removable partial denture abutments on bone stresses: a three-dimensional finite element study |
| title_sort | effects of splinting periodontally compromised removable partial denture abutments on bone stresses a three dimensional finite element study |
| topic | abutment biomechanics finite element analysis fixed splinting periodontal support removable partial denture |
| url | http://www.sciencedirect.com/science/article/pii/S1991790210600013 |
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