الفهرس 
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Abstract
Summary
This study was conducted to assess the effect of flexible thermoplastic partial dentures on the abutment supporting structures in patients exhibiting upper Kennedy class III edentulous space with a modification area. Fourteen partially edentulous male patients were precisely selected to avoid factors that may adversely affect the results of this study.
Removable partial dentures were constructed for all patients following the same procedures and the same design. The components of the denture were combined denture base, Aker clasps as direct retainers and palatal strap as a major connector. According to the framework material the selected patients were randomly divided into two equal groups:
group I:
For Patients of this group partial denture metal framework was constructed using chromium cobalt alloy.
group II:
For Patients of this group partial denture metal free framework was constructed using Biodentaplast material
The effect of each framework material on the supporting structure was evaluated by measuring:
1- Pocket depth changes around the abutment teeth.
2 - Bone height changes around abutment teeth.
Follow up and data collections were performed at the time of denture insertion, six and twelve months after insertion. Pocket depth of the abutment teeth was evaluated using a graduated periodontal probe. Radiographic evaluation of changes in bone height of abutment teeth was carried out using digital panoramic radiograph.
The results obtained from this study revealed a significant increase in crestal bone height loss of the abutment for group I patients at the end of the six months follow up period. On the other hand, an increase in crestal bone height loss of the abutment for group II patients was detected at the end of the one year follow up period. Although the increase crestal bone height loss was evident in group I patients but this difference was statistically non significant.
Although there was increasing in pocket depth measurements throughout the whole follow up period, statistical analysis of data revealed in significance differences in group I and group II . Also there was insignificant difference of the measured pocket depth between group I and group II.
Conclusions
- Within the limitations of the follow up period and the number of patients, from measured parameters of this study it could be concluded that: thermoplastic resin is a biologically acceptable material for partial denture construction. Long term clinical study may be needed to determine generalized effect of thermoplastic resin on partial denture supporting structures.