The invention provides a method for dental restoration including direct modification of an abutment in the oral environment to obtain the ideal shape, contour, and margin placement. The method is featured with directly measuring the shortest distance X1 between a location L1 on the surface of the abutment and the surface of a surrounding object, and increasing the shortest distance X1 until it is not less than a predetermined value. The invention exhibits numerous merits such as simplified procedure, cost-effectiveness, reduction of laboratory adjustment, reduction of chair time, and reduction of office visits.