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11th world congress on pain (International association for study of pain)国際疼痛会議に参加して
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歯科矯正治療により咬頭嵌合位を変位させた成人女性症例
Get PDFapplication/pdfIt could be agreed that stable occlution after orthodontic treatment would be achieved by a preferable relationship between the teeth and the condylar position. In addition, several stable muscle environments surrounding teeth could affect long-term stability of the orthodontic treatment. Most practitioners suggest that the intercuspal position should meet with the centric relation of the condylar heads in the temporal fossae. On the other hand, it is also clearly observed that some orthodontic patients achieve stable occlution and a harmonic environment for the orbicularis oris with medial displacement of the condylar heads opposed to the position of the centric relation. In this case report, an adult female was given orthodontic treatment by means of 0.022 inch's slot edgewise appliance and four premolars were extracted. There was about a 3 mm difference in the position of her chin after orthodontic treatment and she achieved stable occlution and desired facial profile with mandibular medial reposition. The retention was provided for 2 years and a stable result was established after retention.journal articl
新しい付加型シリコーン系軟質裏装材の諸性質
Get PDFapplication/pdfThe purposes of this study were to investigate the water uptake characteristics, color change and Shore-A hardness of new kinds of addition-silicone-based soft liners and two another commercial silicone based soft liners. Seven specimens were made using specially constructed plaster molds. Water sorption measurements were determined gravimetrically at 37℃ in distilled water and were compared after 1 day and 14 days. Color changes were evaluated on specimens that were stored in testing solutions (saline, instant coffee and olive oil mix with β-carotene). The color was measured with a Spectrophotometer CM 1000 and hardness was evaluated using a Durometer Shore-A hardness instrument DD 2-A. These measurements were done after 1, 2, 3, 4 and 12 weeks, with the materials stored in temperature controlled water bath at 37℃. Mean values and standard deviations were calculated for each experiment and material. The water sorption was compared statistically with a Student's t-test for each material and compared statistically with a one-way analysis of variance and Student's t-test. Bartlett's test for homogeneity of variance was applied to the data for color change and hardness, and multiple comparisons using Tukey's test were performed. For the new developed addition-silicone-based soft liners, the water uptake was quite small as the days, and color change was also quite small in three solutions. Severe color change was observed in instant coffee and olive oil mix for another two commercial soft liners. In the hardness test, there were no significant differences from 1 week to 12 weeks in each solution for the new materials. Although water uptake was limited, color changes were observed in the two commercialized materials, particularly with the instant coffee and oil mix. Among several factors responsible for color change, staining characteristics of the surrounding medium seems to be the most important factor for the observed color change. Hardness was increased in fluoride contained soft liners. The novel silicone soft liners tested in this study are available for clinical use.journal articl
Applications for human rights relief and the recommendations of the Japan Federation of Bar Associations
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Characteristics and properties of composite pastes based on novel Bis-GMA analogues
Get PDFapplication/pdfThe relationship between filler type, filler content, and matrix resin composition and viscosity, and the flow characteristics of composite formulations were investigated. The structures of three newly synthesized monomers, i.e., 3F Bis-GMA, 6F Bis-GMA (Bis-GMA analogues) and IP AGDM (based on phthalic acid) were analyzed to determine their viscosity and polymerization shrinkage. Viscosities were determined with a cone and plate viscometer and shrinkages were determined gravimetrically. All three experimental monomers required less dilution than Bis-GMA, and they exhibited remarkable reductions in polymerization shrinkage relative to Bis-GMA. Bis-GMA and 4 experimental Bis-GMA analogues were also evaluated. For each monomer-filler combination, increasing filler contents resulted in monotonic plasticities. The maximum filler contents appeared to be an attribute of the particular filler rather than a matrix resin characteristic. Plasticity differences existed, unexpectedly, even at constant filler contents and matrix viscosities. Evidence was found that the plasticity varied with the base monomer composition and the amount of TEGDMA present.journal articl