Читать книгу Periodontics - Fernando Suarez - Страница 110

The clinical and microbiologic effects of subgingival restorations have also been investigated. Lang et al found that placement of restorations with overhanging margins resulted in changes in subgingival microflora.¹⁹⁶ Also, increased proportions of gram-negative anaerobic bacteria, black-pigmented Bacteroides, and an increase in anaerobe:facultative ratio were noted. These changes may potentially initiate periodontal disease associated with iatrogenic factors. Similarly, the quality of plaque subjacent to bridge pontics from inflamed sites seems to harbor a higher proportion of periodontopathic bacteria (eg, Porphyromonas gingivalis, Prevotella intermedia, and Tannerrella forsythia) when compared with healthy sites.²¹²