الفهرس 
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Abstract
This study was conducted to assess and compare the effect of toothimplant
supported and retained distal extension partial denture and
implant supported and retained maxillary overdenture in the prevention of
combination syndrome by measuring bony and soft tissue changes in the
anterior maxilla and thickness of the of the masticatory mucosa.
Twenty one patients exhibiting mandibular bilateral distal
extension edentulous area (Kennedy class I) and completely edentulous
maxillary arch were selected to participate in this study. Patients were
precisely selected and thoroughly examined in an attempt to reduce
human variables and eliminate any factor that might adversely affect the
results of this study.
The selected patients were randomly divided into three equal
groups:-
group I: Patients in this group were rehabilitated with mucosa
supported complete denture and tooth-tissue supported partial denture
retained by RPI direct retainer.
group II: Patients in this group were rehabilitated with mucosa
supported complete denture and lower tooth-implant supported and
retained partial denture by two osseointegrated implants on each side of
the lower arch in the molar area retained by RPI direct retainer
group III: Patients in this group were rehabilitated with implant
retained and supported complete denture by four osseointegrated implants
in the anterior maxillary area and tooth-tissue supported partial denture
retained by RPI direct retainer.