PURPOSE: Microbial leakage and colonization between implants and their abutments may cause inflammatory reactions in the peri-implant tissues. This study evaluated microbial leakage at the implant-abutment interface with a new in vitro model. MATERIALS AND METHODS: Bacterial leakage was tested during dynamic loading in a 2-axis chewing simulator. The authors theorized that dynamic loading would decrease the stability of the implant-abutment connections and thereby lead to bacterial penetration along the gap. Five different implant systems with 8 standard implant-abutment combinations for single molar crowns were tested. The internal aspects of the implants were inoculated with a bacterial suspension and connected to the superstructure with the recommended torque. The specimens were immersed in a nutrient solution and loaded with 1,200,000 cycles of 120 N in the chewing simulator. RESULTS: Statistically significant differences (P < or = .05) between implant systems with respect to number of chewing cycles until bacterial penetration were found. DISCUSSION: The degree of penetration in a specific implant system presumably is a multifactorial condition dependent on the precision of fit between the implant and the abutment, the degree of micromovement between the components, and the torque forces used to connect them. CONCLUSION: It was concluded that the newly developed test model is a sensitive tool for the detection of differences between current implant systems with respect to their ability to prevent bacterial penetration at the implant-abutment interface under dynamic loading conditions.
PURPOSE: Microbial leakage and colonization between implants and their abutments may cause inflammatory reactions in the peri-implant tissues. This study evaluated microbial leakage at the implant-abutment interface with a new in vitro model. MATERIALS AND METHODS: Bacterial leakage was tested during dynamic loading in a 2-axis chewing simulator. The authors theorized that dynamic loading would decrease the stability of the implant-abutment connections and thereby lead to bacterial penetration along the gap. Five different implant systems with 8 standard implant-abutment combinations for single molar crowns were tested. The internal aspects of the implants were inoculated with a bacterial suspension and connected to the superstructure with the recommended torque. The specimens were immersed in a nutrient solution and loaded with 1,200,000 cycles of 120 N in the chewing simulator. RESULTS: Statistically significant differences (P < or = .05) between implant systems with respect to number of chewing cycles until bacterial penetration were found. DISCUSSION: The degree of penetration in a specific implant system presumably is a multifactorial condition dependent on the precision of fit between the implant and the abutment, the degree of micromovement between the components, and the torque forces used to connect them. CONCLUSION: It was concluded that the newly developed test model is a sensitive tool for the detection of differences between current implant systems with respect to their ability to prevent bacterial penetration at the implant-abutment interface under dynamic loading conditions.
Authors: C do Nascimento; N Monesi; I Y Ito; J P M Issa; R F de Albuquerque Junior Journal: Eur J Clin Microbiol Infect Dis Date: 2011-04-30 Impact factor: 3.267
Authors: D Martin-Gili; M Molmeneu; M Fernandez; M Punset; Ll Giner; J Armengou; F Javier Gil Journal: J Mater Sci Mater Med Date: 2015-07-15 Impact factor: 3.896
Authors: Deceles Cristina Costa Alves; Paulo Sérgio Perri de Carvalho; Carlos Nelson Elias; Eduardo Vedovatto; Elizabeth Ferreira Martinez Journal: Clin Oral Investig Date: 2016-02-20 Impact factor: 3.573