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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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