Screw vs cement-implant-retained restorations: an experimental study in the beagle. Part 2. Immunohistochemical evaluation of the peri-implant tissues

The Journal of Oral Implantology
Bartolomeo AssenzaAdriano Piattelli

Abstract

Crestal bone loss has been reported to occur around dental implants. Even if the causes of this bone loss are not completely understood, the presence of a microgap between implant and abutment with a possible contamination of the internal portion of the implants has been suggested. The aim of this study was to see if there were differences in the vascular endothelial growth factor (VEGF) expression, microvessel density (MVD), proliferative activity (MIB-1), and inflammatory infiltrate in the soft tissues around implants with screwed and cemented abutments. Sandblasted and acid-etched implants were inserted in the mandibles of 6 Beagle dogs. Ten 3.5- x 10-mm root-form implants were inserted in each mandible. A total of 60 implants (30 with screwed abutments and 30 with cemented abutments) were used. After 12 months, all the bridges were removed and all abutments were checked for mobility. A total of 8 loosened screws (27%) were found in the screwed abutments, whereas no loosening was observed in cemented abutments. A gingival biopsy was performed in 8 implants with cemented abutments, in 8 implants with screwed abutments, and in 8 implants with unscrewed abutments. No statistically significant differences were found in the infla...Continue Reading

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Citations

Jul 26, 2011·Journal of Periodontology·Bartolomeo AssenzaSimonetta D'Ercole
Dec 19, 2012·The Angle Orthodontist·Sercan AkyalcinRon L Gallerano
Jul 26, 2011·International Journal of Immunopathology and Pharmacology·A ScaranoF Carinci
Dec 6, 2007·International Journal of Immunopathology and Pharmacology·A ScaranoA Piattelli

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