抄録
Purpose: The deflection of the record base for edentulous patients with unilateral maxillary defect was analyzed using a three-dimensional finite element method.
Method: The model consisted of a lining mucosa and a maxillary record base. The thickness of the mucosa was 3.0 mm in the residual ridge for the normal model, and then the mucosa in the anterior region was increased to 5.0 mm for the model with flabby gum. A simulated load of 5 N vertical to the occlusal plane was applied.
Results: Under the load on the inner slope of the residual ridge at the anteroposterior center of the residual arch without flabby gum, the base showed relatively even depression. However, under the same load for the condition with flabby gum, the base showed displacement in the anterior direction and intrusive displacement of the anterior portion. On the other hand, under the loading to the anteroposterior mid part of the posterior ridge for the case of flabby gum, the base showed little displacement.
Conclusion: The force on the inner slope of the residual ridge may lessen the displacement of the record base for edentulous patients with unilateral maxillary defect and more posteriorly for patients with flabby gum.
