1. When treatment with a removable partial denture is necessary, the transition region from tooth to mucosa support must receive most careful consideration. 2. An occlusal rest placed on the mesial or anterior part of the most distal abutment tooth provides mucosa or soft tissue support more perpendicular to the residual alveolar ridge than does one on the distal side of that tooth. 3. The gingival mucosa adjacent to the most posterior tooth is less likely to be pinched when the occlusal rest is placed on the mesial side of the tooth. 4. The occlusal rest providing a mesial rotation point will tend to tip the abutment tooth anteriorly where it will be reinforced and assisted by other teeth. 5. All extracoronal retainers alter the natural tooth contour and interfere with proper stimulation of the gingivae and natural cleaning action. The infrabulge I bar design alters natural tooth contour the least and allows for more natural gingival stimulation than any other type of extracoronal retainer. The area of contact of the clasp with the tooth is minimal. 6. The I bar retentive clasp, when placed at the point of greatest circumference of the tooth and used in conjunction with a mesio-occlusal rest or anterior rotation point, will exert no adverse or torquing force on the abutment tooth. 7. The region of the junction between the tooth and the edentulous area exhibits pathosis most frequently. The tooth contact should be made with a thin metal plate which extends onto the soft tissue for at least 1 mm. This will increase cleanliness and prevent mutilation of the denture base which results in a space at the tooth-mucosa junction. 8. The metal-tooth contact at the distal gingival region must be physiologically adjusted in the patient's mouth to prevent tooth and tissue impingement.