Immediate implantation in fresh extraction sockets. A controlled clinical and histological study in man.

Background: Early implantation may preserve the alveolar anatomy, and the placement of a fixture in a fresh extraction socket helps to maintain the bony crest. Although a number of clinical studies exist, no histological reports show the outcome of implantation in fresh extraction sockets without the use of membranes in humans compared to implants placed in mature bone.

Methods: Forty-eight healthy patients, receiving at least 4 fixtures in each of 2 symmetrical quadrants, underwent placement of 1 experimental fixture placed in a fresh extraction socket (TI) and 1 contralateral fixture in mature bone (CI).

Periodontal healing in humans using anorganic bovine bone and bovine peritoneum-derived collagen membrane: a clinical and histologic case report.

The authors report the clinical and histologic data on the healing of a severe periodontal lesion obtained in a one-walled intrabony defect using anorganic bovine bone under a bovine peritoneum-derived collagen membrane. Eight months after surgery, a bone-like tissue replaced the lost tissues. A biopsy of this tissue was carried out.

Aspartate aminotransferase activity in crevicular fluid from dental implants.

Background: Aspartate aminotransferase (AST) is an enzyme normally confined to the cytoplasm of cells, but released to the extracellular environment upon cell death. Its levels are associated with the severity of experimental gingivitis and the loss of periodontal attachment. The aim of the present study was to investigate the presence and activity levels of AST in peri-implant crevicular fluid (PCF) from healthy and diseased endosseous implants in order to assess if AST in PCF can be further studied as a possible objective diagnostic aid in oral implantology.

Prevalence of Actinobacillus actinomycetemcomitans and clinical conditions in children and adolescents from rural and urban areas of central Italy.

Background: The aim of this study was to report on the prevalence of Actinobacillus actinomycetemcomitans (Aa) and the periodontal clinical conditions in children and adolescents from a rural area of central Italy compared with the ones from an urban area of the same region.

Method: The study population consisted of 780 systemically healthy children, aged 6-14 years inhabiting the county of Chieti. 505 children attended 3 primary and 2 secondary schools from a rural area whereas 275 individuals attended 1 primary and 1 secondary school from the city of Chieti.

A spartate Aminotransferase Activity in Crevicular Fluid From Dental Impiants.

Background: Aspartate aminotransferase (AST) is an enzyme normally confined to the cytoplasm of cells, but released to the exracellular environment upon cell death. Its levels are associated with the severity of experimental gingivitis and the loss of periodontal attachement. The aim of the present study was to investigate the presence and activity levels of AST in peri-implant crevic-ular fluid (PCF) healthy and diseased endosseous implants in order to assess if AST in PCF can be further studied as a possible objective diognostic aid in oral implantology.