A study on the characteristics of resin composites for provisional restorations.

In this study, we evaluated the characteristics of five commercial resin composites used for provisional restorations. The inorganic filler contents of the resins were measured, and three-point bending, wear, surface hardness, water absorption, and staining tests were performed. The specimens underwent additional three-point bending tests after water storage and undergoing thermal stresses at 5°C and 55°C (10,000 cycles). Data were analyzed using one- or two-way analysis of variance and Bonferroni post-hoc tests. Pearson's correlation coefficient was used for pairwise comparisons. Each resin composite presented with different mechanical properties, based on variations in the inorganic filler content. The flexural strength of each resin composite was significantly decreased after water storage. There has a positive correlation between flexural strength and dynamic hardness but a negative correlation between flexural strength and maximum wear depth. The types and contents of the inorganic fillers, the composition of the monomer in the resin matrix, and the addition of plasticizers can affect the properties of the material.

Mitochondrial function is required for extracellular ATP-induced NLRP3 inflammasome activation.

The NLRP3 inflammasome plays a critical role in the processing and release of inflammatory cytokines, such as interleukin-1ß (IL-1ß) and IL-18. Accumulating evidence suggests that mitochondria are common mediators of NLRP3 inflammasome activation induced by a wide range of inflammatory stimuli; however, the precise role of mitochondria is still not fully understood. Here, we show that mitochondrial function is required for extracellular ATP-induced NLRP3 inflammasome activation. Extracellular ATP induced the loss of mitochondrial membrane potential and mitochondrial fragmentation in a different manner than other stimuli in primary mouse macrophages. CCCP, an uncoupler and antimycin A, an inhibitor of the mitochondrial electron transport chain, inhibited IL-1ß release induced by ATP but not by other stimuli. CCCP did not inhibit the ATP-induced generation of reactive oxygen species and cell death, both of which are known to promote IL-1ß release, but did inhibit the ATP-induced activation of caspase-1, a component of the NLRP3 inflammasome. These results suggest that mitochondrial function is required somewhat specifically for ATP-induced NLRP3 inflammasome activation. In contrast to many previous reports that dysfunctional mitochondria promote NLRP3 inflammasome activation, the function of intact mitochondria appears to be required for NLRP3 inflammasome activation, depending on the stimulus.

[Study on the perception of influencing factors in the course of alcoholism--a comparison among alcoholics, families, and health care professionals].

(1) We prepared a questionnaire modified from that of Edwards, G. et al, to investigate the factors influencing drinking behaviors. Responses of the questionnaire were filled out by the alcoholics, their families, and health care professionals in four psychiatric hospitals having intensive alcoholic rehabilitation programmes. Clinical course of them were traced back for at least two years. (2) We examined the relationship between the course of alcoholism and the differences in perceptions among alcoholics, their families, and health care professionals. (3) We obtained sufficient responses from 76 alcoholics. Those were divided into two groups; one is a group of alcoholics with a history of continuous abstinence of over one year (50 cases), and the other is the group of less than one year of recent abstinence period (26 cases). (4) As the overall results from the participants, items on "self-help group" were favorably responded for the improvement of drinking behavior. Families tend to perceive more sensitively into the internal psychological changes of the alcoholics than the health care professionals, whereas the health care professionals tend to make general and common responses regardless of any alcoholics. We, health care professionals should be aware of such a limit to promote more efficient collaborative works with alcoholics and their families. (5) We compared these two groups ("over one year group" vs. "less than one year group") with regard to their demographic and family backgrounds, clinical features, treatment, self-help group attendance, employment, etc. (6) A significant accordance of responses among three groups (alcoholics, family, health care professionals) was found in the "over one year group" than in the "less than one year group". Such a high level of accordance is considered to reflect a favorable family adaptation along with the recovery from alcoholism, deep understanding on the part of health care professionals, progress in the treatment and in the relationship in a self-help group. (7) As regards the "less than one year" group, it includes more single individuals and less frequent attendances to self-help groups. For this group of alcoholics, group therapy in a smaller group, individualistically oriented approaches for their needs including various supportive resources in the society should be addressed.