The purpose of this study was to determine the surface strain distribution of a crown and bridge, and to compare the biomechanical behavior of a crown and bridge. The complete crown and 3-unit bridge, whose abutments were the second premolar and the second molar, for three cases of first molar deficit in the mandible, were produced, and the surface strain of prostheses under static loading was measured with strain gauges. When a load was applied, although only a small strain was observed near the margin of the crown, a comparatively large tensile strain was observed near the deficit side margin of the distal retainer on the bridge. In the case of a 3-unit bridge, since there is the possibility that strain will occur in the distal retainer, it is necessary to consider the design of the distal retainer during preparation.
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