The Experts below are selected from a list of 8484 Experts worldwide ranked by ideXlab platform
Matthias Kern - One of the best experts on this subject based on the ideXlab platform.
-
Assessment of lipopolysaccharide microleakage at conical Implant-Abutment connections.
Clinical oral investigations, 2011Co-Authors: Sönke Harder, Elgar Susanne Quabius, Lars Ossenkop, Matthias KernAbstract:Objective The aim of this in vitro study was to assess lipopolysaccharide microleakage at conical Implant-Abutment connections of two-piece dental Implants in terms of the expression levels of genes involved in lipopolysaccharide-mediated proinflammatory cytokine production.
-
molecular leakage at Implant Abutment connection in vitro investigation of tightness of internal conical Implant Abutment connections against endotoxin penetration
Clinical Oral Investigations, 2010Co-Authors: Sönke Harder, Birka Dimaczek, Yaha Acil, Hendrik Terheyden, Sandra Freitagwolf, Matthias KernAbstract:Microleakage has been discussed as a major contributing factor for inflammatory reactions at the Implant-Abutment connection. In previous studies, the tightness against corpuscular bodies (viable bacteria) has been successfully investigated under static and dynamic conditions. The aim of this study was to investigate the tightness against endotoxins of two Implant systems (AstraTech and Ankylos) with conical internal connections under static conditions. The inner parts of eight Implants of each system were inoculated with endotoxin. Implants were screwed together with the respective Abutments and stored under isostatic conditions in a supernatant of pyrogen-free water for 168 h. Supernatant samples were taken after 5 min, 24 h, 72 h, and 168 h, and endotoxin contamination was determined by the amebocyte-lysate test. Only one Implant in the AstraTech group showed no sign of endotoxin contamination after 168 h, while the other Implants showed contamination after varying storage times, respectively. The Implants in the Ankylos group showed endotoxin contamination after only 5 min of storage in the supernatant solution. The tested internal conical Implant-Abutment connections appear to be unable to prevent endotoxin leakage. In average, Astra Implants showed a higher tightness than Ankylos Implants.
-
Implant Abutment interface design affects fatigue and fracture strength of Implants
Clinical Oral Implants Research, 2008Co-Authors: Lars Steinebrunner, Stefan Wolfart, Klaus Ludwig, Matthias KernAbstract:Objectives: Failures of Implant–Abutment connections are relatively frequent clinical problems. The aim of this study was to evaluate the influence of long-term dynamic loading on the fracture strength of different Implant–Abutment connections. Material and methods: Six Implant systems were tested: two systems with external connections (Branemark, Compress) and four systems with internal connections (Frialit-2, Replace-Select, Camlog, Screw-Vent). Fracture strength was tested in two subgroups for each system: one subgroup with (dyn) and the other without prior dynamic loading (contr). Each subgroup consisted of eight specimens with standard Implant–Abutment combinations for single molar crowns. Dynamic loading was performed in a two-axis chewing simulator with 1,200,000 load cycles at 120 N. Results: Median fracture strengths in Newton (N) and 25th and 75th percentiles [in brackets] were: Branemark: dyn=729 [0;802]/contr=782 [771;811], Frialit-2: dyn=0 [0;611]/contr=887 [798;941], Replace-Select: dyn=1439 [1403;1465]/contr=1542 [1466;1623], Camlog: dyn=1482 [1394;1544]/contr=1467 [1394;1598], Screw-Vent: dyn=0 [0;526]/contr=780 [762;847] and Compress: dyn=818[0;917]/contr=1008 [983;1028]. In some dyn subgroups, failures of the Implant–Abutment connection occurred already during dynamic loading: three specimens of the Branemark and Compress groups and six specimens of the Screw-Vent and the Frialit-2 groups failed during dynamic loading. Statistically significant differences (P≤0.05) in fracture strength could be found between groups with different connection designs. Conclusion: Implant systems with long internal tube-in-tube connections and cam–slot fixation showed advantages with regard to longevity and fracture strength compared with systems with shorter internal or external connection designs.
-
In vitro evaluation of bacterial leakage along the Implant-Abutment interface of different Implant systems
The International journal of oral & maxillofacial implants, 2005Co-Authors: Lars Steinebrunner, Stefan Wolfart, Klaus Bössmann, Matthias KernAbstract: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.
Carlos Frederico De Moraes Sarmento - One of the best experts on this subject based on the ideXlab platform.
-
The Bacterial Sealing Capacity of Morse Taper Implant–Abutment Systems in Vitro
Journal of periodontology, 2015Co-Authors: Rogerio Ranieri, Andreia Ferreira, Emmanuel Albuquerque Souza, Joao Arcoverde, Fábio Roberto Dametto, Cícero Romão Gadê-neto, Flávio Roberto Guerra Seabra, Carlos Frederico De Moraes SarmentoAbstract:Background: The use of Morse taper systems in dental Implantology has been associated widely with a more precise adaptation between Implants and their respective Abutments. This may lead to an increase in the stability of the Implant system and may also prevent microbial invasion through the Implant–Abutment interface. The aim of this study was to investigate in vitro the ability of four commercially available Morse taper system units to impede bacterial penetration through their Implant–Abutment interfaces.Methods: Abutments were screwed onto the Implants, and the units were subsequently immersed in Streptococcus sanguinis bacterial broth (1 × 108 colony forming units/mL) for 48 hours. The units were examined by scanning electron microscopy (SEM) under three conditions: 1) with the Implant–Abutment components assembled as units to investigate for both the existence of microgaps and the presence of bacteria; 2) with the Implants and Abutments separated for examination of internal surfaces; and 3) with the...
Abrao Rapoport - One of the best experts on this subject based on the ideXlab platform.
-
microbial leakage through the Implant Abutment interface of morse taper Implants in vitro
Clinical Oral Implants Research, 2010Co-Authors: Joao Pedro Aloise, Ricardo Curcio, Marcia Zorello Laporta, Liliane Rossi, Adriana Madeira Alvares Da Silva, Abrao RapoportAbstract:Objectives: The aim of this study was to determine and compare the frequency of bacterial leakage of Streptococcus sanguinis biotype II along the Implant–Abutment interface between two systems of morse taper dental Implants. Different methods of activation of the taper Abutments were used: tapped-in (Bicon©) and screwed-in (Ankylos®). Materials and methods: Twenty sterile assemblies were used and attached, 10 Bicon© and 10 Ankylos® Implants, according to manufacturers' specifications. They were then totally immersed within 20 test tubes containing a sterile nutrient solution brain–heart infusion (BHI). The internal part of the 20 Implants was previously inoculated with 0.1 μl of S. sanguinis II (ATCC 10557) and then connected to the respective Abutments. The assemblies were incubated under anaerobic conditions for 14 days in an autoclave at 37°C. They were monitored daily for solution cloudiness resultant from microbial leakage on the interface of the assemblies. For statistical analysis, the Fisher test was applied and significance was assigned at the 5% level. Results: There was solution cloudiness, indicating the finding of bacterial growth inside two Bicon© assemblies and two Ankylos® assemblies 48 h after incubation. Microbial leakage was further substantiated by testing the suspension for the presence of Streptococcus sp. None of the sterility controls were contaminated. The frequency of bacterial leakage along the Implant–Abutment interface, with the two different morse taper Implant systems, was 20% of the assemblies of each system. There were no statistical differences between them. Conclusion: Irrespective of which of the two morse taper Implant connection systems of activation was analyzed, tapped-in (Bicon©) or screwed-in (Ankylos®), this in vitro experiment showed bacterial leakage along the Implant–Abutment interface. To cite this article: Aloise JP, Curcio R, Laporta MZ, Rossi L, da Silva AMA, Rapoport A. Microbial leakage through the Implant–Abutment interface of morse taper Implants in vitro. Clin. Oral Impl. Res. 21, 2010; 328–335. doi: 10.1111/j.1600-0501.2009.01837.x
Rogerio Ranieri - One of the best experts on this subject based on the ideXlab platform.
-
The Bacterial Sealing Capacity of Morse Taper Implant–Abutment Systems in Vitro
Journal of periodontology, 2015Co-Authors: Rogerio Ranieri, Andreia Ferreira, Emmanuel Albuquerque Souza, Joao Arcoverde, Fábio Roberto Dametto, Cícero Romão Gadê-neto, Flávio Roberto Guerra Seabra, Carlos Frederico De Moraes SarmentoAbstract:Background: The use of Morse taper systems in dental Implantology has been associated widely with a more precise adaptation between Implants and their respective Abutments. This may lead to an increase in the stability of the Implant system and may also prevent microbial invasion through the Implant–Abutment interface. The aim of this study was to investigate in vitro the ability of four commercially available Morse taper system units to impede bacterial penetration through their Implant–Abutment interfaces.Methods: Abutments were screwed onto the Implants, and the units were subsequently immersed in Streptococcus sanguinis bacterial broth (1 × 108 colony forming units/mL) for 48 hours. The units were examined by scanning electron microscopy (SEM) under three conditions: 1) with the Implant–Abutment components assembled as units to investigate for both the existence of microgaps and the presence of bacteria; 2) with the Implants and Abutments separated for examination of internal surfaces; and 3) with the...
Theofilos Koutouzis - One of the best experts on this subject based on the ideXlab platform.
-
Implant‐Abutment connection as contributing factor to peri‐Implant diseases
Periodontology 2000, 2019Co-Authors: Theofilos KoutouzisAbstract:Dental Implant-supported prostheses are an established treatment modality for the functional and esthetic rehabilitation of partial and/or complete edentulous patients. One of the most essential factors for successful treatment outcomes stems from preservation of the peri-Implant bone. Early peri-Implant crestal bone loss has been a common observation, coincides with the time period where most treatment manipulations occur and has been considered as a complex multifactorial event. Microbial leakage at the Implant-Abutment interface has been associated with inflammatory reactions that may jeopardize peri-Implant crestal bone stability. Prevention of microbial leakage at the Implant-Abutment interface is a major challenge in the construction of two-piece Implant systems. Changes in the Implant-Abutment complex design achieved reduction in the magnitude of microbial leakage and/or separation of the Implant-Abutment interface from the osseous surface. However, it is still unclear if microbial leakage at the Implant-Abutment interface plays a role beyond the initial crestal bone remodeling, namely on the development of peri-Implantitis. Therefore, the aim of this review is to analyze the knowledge available on the integrity of different types of Implant-Abutment connections and their potential role on the development of peri-Implant crestal bone loss and peri-Implant diseases.
