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Potential for Load‐Induced Cervical Stress Concentration as a Function of Periodontal Support
Author(s) -
KUROE TOSHIFUMI,
ITOH HIDEMI,
CAPUTO ANGELO A.,
NAKAHARA HIROKO
Publication year - 1999
Publication title -
journal of esthetic and restorative dentistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.919
H-Index - 60
eISSN - 1708-8240
pISSN - 1496-4155
DOI - 10.1111/j.1708-8240.1999.tb00401.x
Subject(s) - cementoenamel junction , cusp (singularity) , periodontal fiber , dentistry , premolar , orthodontics , dental alveolus , dentin , stress (linguistics) , materials science , molar , medicine , mathematics , geometry , linguistics , philosophy
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.