الفهرس 
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Abstract
The purpose of this study was to evaluate and compare the adhesion of microorganisms to the surface of BIO-HPP and metallic removable partial denture base saddles using the same environmental condition.
This study was conducted on fourteen patients attending the outpatient clinic, Department of Removable Prosthodontics, Faculty of Dentistry (Cairo University). All patients had mandibular class III mod 1 Kennedy classification. Equal two bounded edentulous spaces. And the opposing dentition had a complete set of teeth
Fourteen mandibular removable partial dentures were constructed from two bounded base saddles as split mouth design with two different bases, one side was BIO-HPP, and the contralateral side was Co-Cr metal denture bases.
Swabs were taken from the mucous membrane, BIO-HPP and metallic denture bases at different intervals, one month, two months, and three months from each patient with the following sequence:
Before insertion
a. from mucosa
2. After one month from insertion
a. Mucosa under the fitting surface of the BIO-HPP denture base.
b. Mucosa under the fitting surface of the metallic denture base.
c. Fitting surface of the BIO-HPP denture base.
d. Fitting surface of the metallic denture base.
.3. After two months from insertion
Another four swabs were taken in the same manner and sequence as the first month.
4. After three months from insertion
Another four swabs were taken in the same manner and sequence as the first month.
Blood agar culture base was used for the cultivation of microorganisms and after 24 hours the microorganisms were counted.
from this study it was concluded that:
1. The mucosa under the BIO-HPP denture base retain approximately more microorganisms than the mucosa of the Co-Cr denture base. But this increase was not statistically significant.
2. The Co-Cr denture base retain more microorganisms than the BIO-HPP denture base.
3. The adhesion of microorganisms increases by time on mucosa and denture base made either from Co-Cr or BIO-HPP.