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Potential for Load-Induced Cervical Stress Concentration as a Function of Periodontal Support |
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| Authors: | TOSHIFUMI KUROE,DDS, HIDEMI ITOH,DDS,Ph,D&dagger ANGELO A. CAPUTO,Ph,D&Dagger HIROKO NAKAHARA,DDS,Ph,D§ |
| Affiliation: | Visiting Assistant Researcher, Biomaterials Science, Division of Advanced Prosthodontics, Biomaterials Science, and Hospital Dentistry, UCLA School of Dentistry, Los Angeles, California;Lecturer, Department of Prosthetic Dentistry II Tohoku University School of Dentistry, Sendai, Japan;Professor of Biomaterials Science, Division of Advanced Prosthodontics, Biomaterials Science, and Hospital Dentistry, UCLA School of Dentistry, Los Angeles, California;Head of Dental Division, Miyagi National Hospital, Miyagi, Japan |
| Abstract: | Abstract: Purpose : The purpose was to determine, photoelastically, the locations of occlusal load-induced stress concentrations within a maxillary premolar as a function of degree of periodontal support. Materials and Methods : Composite three-dimensional models of a maxillary first premolar were fabricated for quasi-three-dimensional photoelastic stress analysis. Individual materials were used to model enamel, dentin, periodontal ligament, and alveolar bone. Three levels of periodontal support reduction (0%, 20%, 25%) were simulated by varying the socket depth. Vertical loads of 10 lb were applied to: (1) tip of buccal cusp, (2) tip of lingual cusp, and (3) center of occlusal surface. The resulting stresses were monitored and recorded photographically in the field of a circular polariscope arrangement. Results : Cuspal loading concentrated stress around the cervical region below the loaded cusp, being highest under buccal cusp loading. The location of the stress concentration shifted apically as periodontal support diminished. |
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