الفهرس 
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Abstract
Fifteen male patients had been selected for this study. The selected patients exhibited intact maxillary arch and bilateral distal extension mandibular edentulous areas with the second premolars as the last abutments
The selected patients were divided randomly into three equal groups:
group I: patients received well designed skeletal RPDs.
group II: patients received cast clasp interim partial denture which were supported by occlusal rests on the prepared abutments.
group III: patients received all acrylic removable partial denture retained by wrought wire clasp without any tooth support.
The effect of each partial denture design on the supporting structures was evaluated by:
1-The flow of crevicular fluid
2- The periodontal pocket depth,
3-The marginal bone height around the abutment teeth, and the crestal bone height of the edentulous ridge.
Crevicular fluid was collected using filter paper strips. The stained area was measured by Image Tool program. Pocket depth was measured by graduated periodontal probe. Periapical radiographs following the long cone paralling technique were made. Bone changes were measured around the abutments, and 15mm distal to the abutments using the Image Tool program.
These parameters were measured at denture delivery, six, and twelve months after denture insertion, tabulated, and statistically analyzed.
The results obtained from this study showed that there was marked increase in the flow of crevicular fluid of the all acrylic denture followed by the cast clasp denture while the skeletal denture showed the least amount of crevicular fluid indicating that the type of denture support significantly influenced the gingival health. The proximal bone height around the abutment and the pocket depth of the skeletal dentures and the cast clasp partial dentures remained somewhat stable while the bone around the all acrylic interim dentures were extensively resorbed with increased pocket depth. On the other hand, the crestal bone distal to the abutment was excessively resorbed in both types of interim denture when compared with the skeletal denture reflecting the effect of other denture components and design principles on the amount of bone resorption