Influence of width and depth of palatal vault on rigidity of palatal strap: A finite element study |
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| Authors: | Takuya Takanashi Ichiro Shimamura Kaoru Sakurai |
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| Affiliation: | 1. Department of Gastroenterology, Szent Imre Teaching Hospital, Tétényi Str. 12-16, H-1115 Budapest, Hungary;2. 2nd Department of Medicine, Faculty of Medicine, Semmelweis University, Szentkirályi Str. 46, H-1088 Budapest, Hungary;1. Industrial and Systems Engineering Department, KAIST, Daejeon, South Korea;2. Radiation Oncology and Molecular Radiation Sciences Department, Johns Hopkins School of Medicine, Baltimore, MD, USA;3. Cybermed Inc., Seoul, South Korea;1. Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Okan University, Istanbul, Turkey;2. Professor, Department of Prosthodontics, Faculty of Dentistry, Ankara University, Ankara, Turkey;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;3. Key Laboratory of Biomedical Materials and Implants, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China;1. Department of Diagnostic Radiology, Mansoura Faculty of Medicine, Mansoura 13551, Egypt;2. Department of pathology, Mansoura faculty of medicine, Mansoura, Egypt |
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| Abstract: | PurposeThe purpose of this study was to develop design criteria for palatal straps according to palatal shape.MethodsThe palatal shapes of 60 dentate maxillary stone casts were measured using a contact-type three-dimensional measuring instrument. Based on the average of the 60 palatal shapes, 5 three-dimensional finite element models (FE models) were constructed: a basic FE model, a wide palatal FE model, a narrow palatal FE model, a deep palatal FE model and a shallow palatal FE model. The FE models were simulated unilateral free-end saddle dentures with the maxillary left second premolar and first and second molars missing. The FE models included a denture base, two rests and a palatal strap. The mechanical properties of Co–Cr alloy, Ti–6Al–7Nb alloy and type IV gold alloy were given to the FE models. A vertical load of 50 N was loaded onto the occlusal surface of the left first molar. Vertical displacement of the distal edge of the denture base was then compared between models.ResultsCompared to the basic FE model, displacement in the wide FE palatal model and shallow palatal FE model was larger, and displacement in the narrow palatal FE model was smaller. The difference in displacement between the deep palatal FE model and basic FE model was small.ConclusionsWith a wide and shallow palate, it is necessary to design a reinforced palatal strap. With a narrow palate, the anteroposterior width of the palatal strap can be narrower. With a deep palate, it is not necessary to change the palatal strap design according to the palatal shape. |
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