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A narrow channel is provided in an dental abutment post to allow excess dental cement to flow out of the interstitial space between the dental abutment and the overlying prosthesis. During the seating of the prosthesis the excess dental cement is channeled to and extruded from a preferred collection point for easy removal. Hydrostatic pressure and trapped gasses that would tend to lift the prosthesis into a non-fitting position or form a weakened cemented bond of uneven thickness are prevented by this apparatus and method to relieve pressure.