accurate master casts, final survey and design, education of the patient, insertion and maintenance of the dental prosthesis are a ll of equal importance. M outh preparation may encompass a ll fields of dentistry. The importance of modification of teeth by grinding and polishing, or cast restorations to harmo­ nize w ith the path of insertion of the denture, has been discussed. These modi­ fications should provide the partia l den­ ture w ith adequate support, stability and retention w ith in the physiological lim its of the supporting structures. M od ifica­ tions of the opposing occluding surfaces are indicated to aid in establishing proper occlusion. A removable partial denture made in accordance w ith these principles is not the forerunner of a complete den­ ture, but maintains oral tissues and health. 504 Security National Bank Building