The prevalence of A. actinomycetemcomitans, @entity2523 and XXXX in selected subjects with @entity2521 .

@entity1 @entity604 @entity3288 @entity2521 @entity3841 @entity2523
The present study was carried out in a private periodontal practice. 8 clinical criteria were chosen to select @entity1 for microbiological examination. These criteria characterize prominent features of disease which at the start, during, or in the maintenance phase of treatment suggest difficulties in the progress of the periodontal therapy. Based on these clinical characteristics, an inventory was made of the prevalence of the 3 putative periodontal pathogens: @entity3841 , @entity2523 , @entity3288 . Out of 320 referred @entity1 91 @entity1 did meet > or = 1 of the clinical criteria and consequently were selected for microbiological examination. Results showed that young @entity1 (19-30 years) with @entity2521 demonstrated the presence of A. actinomycetemcomitans more often (69%: p < 0.005) compared to older age cohorts. A. actinomycetemcomitans was found more often when localized breakdown (in particular in the 1st molar and incisor region) was observed and in @entity1 who responded poorly to scaling and rootplaning. @entity2523 and @entity3288 were most frequently recovered in @entity1 showing primarily a @entity604 pattern of angular defects of > or = 5 mm. Retrospectively, these @entity1 were further categorized, based on full mouth radiographs, in (1) @entity1 with primarily horizontal @entity604 and (2) @entity1 with primarily angular bony defects. Results showed that A. actinomycetemcomitans occurred less frequently in @entity1 showing horizontal @entity604 (p < 0.05).
