Browsing by Subject "Resilon"

Now showing 1 - 4 of 4
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    Evaluation of fracture resistance of three post and core systems in endodontically treated teeth under loading to failure; and marginal gap measurement before and after cyclic loading
    (2009) Saad, Amir N., 1979-; Platt, Jeffrey A., 1958-; Matis, Bruce A.; Andres, Carl J., 1942-; Katona, Thomas R.; Levon, John A.
    The purpose of this study was to evaluate the fracture resistance of three post and core systems in endodontically treated teeth by loading to failure, and to measure marginal gaps before and after cyclic loading. Sixty extracted canines were assigned to three groups. The groups tested were: 1) Single cast post and core (Group CP). 2) Prefabricated metal post and composite resin core (Group MR). 3) Glass fiber post and composite resin core (Group FR). All teeth were obturated and prepared to receive a post and core with a coping. Thirty teeth (10 from each group) were loaded to failure, and the other 30 teeth were fatigue-loaded. The marginal gaps on the facial and lingual surface of the fatigue-loaded group were measured before and after cyclic loading. There were two hypotheses for this study. The first was that the FR group would have less marginal gap opening on the lingual surface than the other groups. The second was that the CP group would have a higher load at failure than the other groups. Group CP was found to have a significantly smaller pre-loading marginal gap than group FR (p = 0.0265) and group MR (p = 0.0273), while groups FR and MR did not have a significantly different pre-loading marginal gaps (p = 0.86). Group FR had significantly less change in marginal gap than group MR (p = 0.0013). Groups CP and MR did not have significantly different changes in marginal gap (p = 0.09). Groups CP and FR did not have significantly different changes in marginal gap (p = 0.11). The three post types did not have significantly different maximum loads to failure (p= 0.49), moments of inertia at cervical area (p = 0.75), or moments of inertia at fracture site (p=0.12). There was no significant difference between groups CP, FR, and MR in the load-to-failure test. Group CP demonstrated the highest load-to-failure values; however, the highest load-to-failure mean was for group MR. All fractures observed in this study were catastrophic. Group FR demonstrated better stress distribution and caused no early fractures in the fatigue-loading group. All groups demonstrated significant marginal gap changes on the lingual surface after fatigue loading; however, group FR demonstrated <45 μm marginal gap opening. In group FR, the reduced marginal gap opening was attributed to the use of Panavia 21 with the proper surface treatments to bond to the tooth structure, the resin composite, and the metal coping.
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    An in-vitro comparison of the microleakage of RealSeal/Resilon and RealSeal Self-Etch/Resilon root canal obturation system
    (2011) Iqbal, Haris; Spolnik, Kenneth Jacob, 1950-; Vail, Mychel Macapagal, 1969-; Legan, Joseph L.; Gregory, Richard L.; Moore, B. Keith; Zunt, Susan L., 1951-
    The purpose of this investigation was to evaluate and compare microleakage of teeth obturated using either RealSeal/Resilon or RealSeal Self-Etch/Resilon systems. The goal was to determine whether a significant difference in microleakage exists between these two groups. To date, no study has been done comparing the microleakage of root canal systems obturated with using RealSeal/Resilon versus RealSeal SE/Resilon. Sixty-two human, single-rooted, anterior teeth were accessed and instrumented for non-surgical root canal therapy. Teeth were randomly assigned to two experimental groups of 27 teeth each. Group I consisted of teeth obturated with the RealSeal/Resilon system, whereas Group II consisted of teeth obturated with the RealSeal SE/Resilon system. In addition, two control groups containing four teeth each served as positive and negative controls, Group (+) and Group (-), respectively. The teeth were then evaluated for microleakage using a dual-chamber microleakage model. Visual turbidity in the lower chamber denoted microleakage within the experimental groups observed for 33 days. RealSeal SE Group II had a significantly higher proportion of samples than Real Seal Group I. Time to microleakage was also significantly lower in RealSeal SE Group II than in Real Seal Group I. No microleakage was observed in the negative control and microleakage was observed in all four samples in the positive control. To date, this is the first study comparing the microleakage of RealSeal/Resilon and RealSeal SE/Resilon systems. The higher microleakage associated with RealSeal SE is attributed to the higher pH of the self-etch (SE) sealer in comparison with the self-etch primer of RealSeal. The self-etching potential of the sealer system is particularly critical in areas inaccessible to calcium chelating agents such as EDTA in root canal systems. Further research needs to be done to corroborate the microleakage results from this study. The microbial leakage apparatus devised in this study, which used a selective growth medium with streptomycin, has also been validated by the results of the study. The bacterial leakage apparatus has been considered to be clinically relevant and acceptable by the Journal of Endodontics. Thus, the modified dual-chambered microleakage apparatus with a selective growth medium used in this research can be replicated easily in future microleakage studies.
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    An in-vitro evaluation on the biocompatibility of resilon by the microbiota of the infected root canal utilizing an agar disc diffusion assay
    (2012) Whatley, Jenny J. (Jenny Johnson), 1982-; Spolnik, Kenneth Jacob, 1950-; Vail, Mychel Macapagal, 1969-; Gregory, Richard L.; Legan, Joseph J.; Zunt, Susan L., 1951-; Ehrlich, Ygal
    Resilon is a resin-based obturation material that claims to create a monoblock through bonding of RealSeal sealer to the dentin walls and to the core material. Resilon is comprised of a biodegradable polymer, polycaprolactone, and inorganic fillers. Resilon has been shown to undergo enzymatic hydrolysis by bacterial enzymes such as lipase. This study aims to demonstrate if bacteria found within the infected root canal system are capable of degrading Resilon utilizing an agar disc hydrolysis method. A 0.1-percent Resilon emulsion and a gutta-percha emulsion were prepared with Tryptic Soy Agar in plates. Several bacterial species were inoculated in eight spots each on the Resilon and gutta-percha agar plates and the plates were observed for the formation of hydrolytic halos surrounding bacteria signifying their ability to degrade the material. The bacterial enzyme Lipase PS served as a positive control. P. intermedia, P. aeruginosa, P. assacharoylitica, S. epidermidis and S. aureus all demonstrated hydrolytic halos, clear zones, at each of the eight inoculation locations (100%, 95%CI 63%-100%) on the Resilon plates. The halos were similar to those seen in the positive lipase control. No halos were seen with E. faecalis, F. nucleatum, S. mutans, S. sanguis, or P. gingivalis at any of the eight inoculation spots (0%, 95%CI 0%-37%) on the Resilon plates. No hydrolytic halos were seen around any bacterial colonies or the Lipase PS on the gutta-percha plates. The results of this study indicate that bacteria found in endodontic infections can hydrolize Resilon dispersed into an emulsion. The potential exists for Resilon degradation after its use as an obturation material in infected root canal systems. Given that root canal therapy does not render a canal void of microorganisms, it is prudent to obturate the root canal system with a material that cannot be degraded by bacteria and their enzymes.
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    Susceptibility of methacrylate-based root canal filling to degradation by bacteria found in endodontic infections
    (Quintessence International, 2014-07-10) Whatley, Jenny D.; Spolnik, Kenneth J.; Vail, Mychel M.; Adams, Benjamin H.; Huang, Ruijie; Gregory, Richard L.; Ehrlich, Ygal
    Objectives: To present a case of endodontic failure obturated with a methacrylate-based root filling material, Resilon/ RealSeal (RS). To determine if RS is susceptible to biodegradation by endodontically relevant microbes by a method known to show RS degradation. Method and Materials: Emulsions of RS were dispersed in agar with minimal bacterial nutrients in culture plates. Lipase PS served as a positive control. Pseudomonas aeruginosa, Fusobacterium nucleatum, Prevotella intermedia, Porphyromonas gingivalis, Porphyromonas asaccharolytica, Enterococcus faecalis, Streptococcus sanguis, Streptococcus mutans, Staphylococcus aureus, and Staphylococcus epidermidis were tested for their ability to biodegrade RS. The bacteria were inoculated in the plates and examined daily for RS degradation for 7 days. Results: Degradation of the emulsified RS manifested in the formation of clear zones around P aeruginosa, P intermedia, P asaccharolytica, S aureus, and S epidermidis. No degradation was seen with the other tested bacteria or in plates that did not contain RS emulsion. Conclusion: Endodontic pathogenic bacteria can degrade RS. These findings complement other work and suggest that the seal and integrity of root canal fillings obturated with RS may be impaired by a microbial insult.