Research using low frequency atmospheric pressure plasma jets (LF jet) is becoming increasingly more common. We carried out experiments to evaluate the sterilizing effects of this technology on oral pathogenic microorganisms (S.mutans, C.albicans and E. faecalis) and to determine its potential for clinical application. We performed the direct exposure test on a solid surface, indirect exposure test on a liquid phase, and ROS (reactive oxygen species) inhibitory test. The results showed the LF jet had microbicidal effects on oral pathogens, and that the ROS influenced this sterilization effect. The experiments of this study revealed that LF jet had a sterilizing effect on oral pathogenic microorganisms present in both the solid and liquid phases. The sterilizing mechanism was considered to be related to the effect of superoxide anion radicals. These results indicate that LF jets may represent a novel technology that can be applied to the field of clinical dentistry.
The resin-coating technique is one of the successful bonding techniques used for the indirect restorations. The dentin surfaces exposed after cavity preparation are coated with a thin film of a coating material or a dentin bonding system combined with a flowable composite resin. Resin coating can minimize pulp irritation and improve the bond strength between a resin cement and tooth structures. The technique can also be applied to endodontically treated teeth, resulting in prevention of coronal leakage of the restorations. Application of a resin coating to root surface provides the additional benefit of preventing root caries in elderly patients. Therefore, the coating materials have the potential to reinforce sound tooth ("Super Tooth" formation), leading to preservation of maximum tooth structures.
From a selection of four kinds of post and core systems, including a fiber post and composite resin core, the purpose of this study was to determine the most effective system for the restoration of endodontically treated teeth with 0 mm of coronal tooth structure. For experimental abutment teeth, typical human maxillary central incisor teeth were modeled using bovine mandibular incisor teeth. By means of a static loading test, the four restoration systems were evaluated and compared in terms of failure load and failure mode. Further, by means of a cyclic loading test, these systems were assessed in terms of durability. For fiber post and composite resin core, it excelled from the standpoints of failure load and failure mode, and fared favorably too in durability after cyclic loading test. For composite resin post-and-core, it also showed excellent results for both failure load and failure mode in static loading test, but durability significantly decreased with cyclic loading. Taken together, the fiber post and composite resin core was found to be most effective from the standpoints of failure load, failure mode, and durability.
In recent years, the demand for esthetics in restorative dentistry has been increasing. While many allceramic systems have been developed over the years, few long-term clinical data for these systems are available. In this study, we conducted a retrospective clinical evaluation of In-Ceram crowns placed at the Tsurumi University Dental Hospital, at 54 to 64 months after the crown placement. Of the total of 70 In-Ceram crowns fitted, 57 could be followed up. Five crowns were missing, of which two were removed due to fracture problems. Thus, the cumulative survival rate of the In-Ceram crowns was 91.2%, which indicate the clinical acceptability of the In-Ceram crowns. We believe that these results would be useful in clinical practice. AbstractPurpose: The purpose of this study was to evaluate InCeram crowns after 5 years' use in vivo. Methods:A total of 70 In-Ceram crowns were placed at the Tsurumi University Dental Hospital, Department of Prosthetic Dentistry, during the period from May 1995 to April 1996. A follow-up study was conducted 5 years later, from December 2000 to January 2001. We first examined whether the In-Ceram crowns were still functioning. In cases where the abutment tooth was missing, we asked the patients when and how it was lost. In addition, each crown was evaluated by two examiners according to the modified USPHS (US Public Health Service) criteria, which include marginal integrity, shade compatibility, secondary caries, and wear of the occlusal surface. Then, the examiners calculated the period of functioning of each crown from the date of placement to the present (or the date of failure). The survival curve of the In-Ceram crowns was analyzed using the nonparametric Kaplan -Meier method.Results: A total of 57 of 70 In-Ceram crowns were examined after a mean of 60 months following their placement, and the remaining 13 were lost to followup. Fifty-two of the 57 In-Ceram crowns were found to be still functional, while the remaining five crowns were missing. Two of the five missing crowns had been removed due to fracture after 33 and 53 months, respectively. Another of the missing crowns had been removed because of periodontal disease after 29 months. The remaining two of the five missing crowns had been removed because of dislodgement of the dowel and core after 39 months in one case, and because a fixed partial denture including this tooth was fabricated after 55 months in the other case. According to the five categories of the modified USPHS (US Public Health Service) criteria, most crowns were assessed as Alpha, while both shade match and wear were rated as Charlie in 3.8% of the crowns. The cumulative survival rate was 91.2% (standard error: 0.038). Conclusion:Out of the 70 crowns placed in 1995/ 1996, 57 In-Ceram crowns were available for followup at the end of an average of 5 years after their placement, and the survival rate of the In-Ceram crowns was 91.2%. Within the framework of the limitations of this clinical evaluation, the In-Ceram crowns were found to be clinically acceptable, ...
The purpose of this study was to evaluate polymerization shrinkage and other physical properties of newly-developed cavity base materials for bulk filling technique, with the brand name BULK BASE (BBS). Polymerization shrinkage was measured according to ISO/FDIS 17304. BBS showed the significantly lowest polymerization shrinkage and significantly higher depth of cure than conventional flowable resin composites (p<0.05). The Knoop hardness, flexural strength and elastic modulus of that were significantly lower than conventional flowable resin composites (p<0.05). BBS had the significantly greatest filler content (p<0.05). SEM images of the surface showed failure of fillers. The lowest polymerization shrinkage was due to the incorporation of a new type of low shrinkage monomer, which has urethane moieties. There were no clear correlations between inorganic filler contents and polymerization shrinkage, flexural strength and elastic modulus. In conclusion, the low polymerization shrinkage of BBS will be useful for cavity treatment in dental clinics.
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