ABSTRACT

Aim of study: This study aimed to evaluate the bacterial growth and biological consideration of two removable partial dentures design retained by two different Extracoronal attachment designs.

Material and Methods: Fourteen Kennedy class II partially edentulous patients who had the second premolar terminal abutment tooth were selected. The patients were divided into two equal groups group I; participants received partial denture retained by OT cap extra coronal attachment with bilateral cross arch stabilization, group II: participants received unilateral partial denture retained by OT unilateral extra coronal attachment. To evaluate the biological state of the terminal abutment tooth, measurements of the pocket depth were made on four sides of the tooth. Furthermore, to assess the level of bacterial colonization, microbiological swabs were taken from each patient's buccal, lingual, mesial, and distal abutment surfaces.

Results: the study showed that there was statistically significant difference in the quantitative bacterial culture as group I was significantly higher than group II at all intervals. For pocket depth there was not a statistically significant difference between the two groups at time of insertion. On the other side at 3 and 6 months, Group I was significantly higher than group II in pocket depth measurements.

Conclusions: It was found that extra coronal precision attachment (OT unilateral) exerts less stress on the abutment teeth and their supporting structures in comparison to OT cap attachment. Moreover, it is more biologically conservative, humble, and more comfortable for the patients.