Asian Pacific Journal of Dentistry最新文献

Real time measurement of stress by electroencephalogram during contentious mouth opening 争议性张口时脑电图压力的实时测量

Asian Pacific Journal of Dentistry Pub Date : 1900-01-01 DOI: 10.47416/apjod.19-0261

Ryoko Otsuka, Y. Nomura, Ayako Okada, Masahide Uraguchi, H. Tadokoro, Tetsuya Nagai, Yoshihito Fujii, M. Miura, Ryo Kawachi, M. Yamamoto, Taketoshi Wakana, N. Hanada

{"title":"Real time measurement of stress by electroencephalogram during contentious mouth opening","authors":"Ryoko Otsuka, Y. Nomura, Ayako Okada, Masahide Uraguchi, H. Tadokoro, Tetsuya Nagai, Yoshihito Fujii, M. Miura, Ryo Kawachi, M. Yamamoto, Taketoshi Wakana, N. Hanada","doi":"10.47416/apjod.19-0261","DOIUrl":"https://doi.org/10.47416/apjod.19-0261","url":null,"abstract":"Purpose: Dental treatment is a stressful event. The aim of this study was to evaluate the feasibility of electroencephalography (EEG) for the measurement of stress the stress of the patient’s ongoing dental treatment. Materials and Methods: Real-time brain activity was measured for five healthy subjects (three males and two females) under contentious opening mouth conditions and compared with the relaxed conditions for 18 minutes. Brain activities were measured under the conditions that subjects were sited on the dental chair in horizontal situation. Electroencephalograph (EEG) were used to measure the five type of brain waves: θ, α1, α2, α3, and β. Results: In θ wave, α3 wave and β wave, widening gap between opening mouth condition and closing mouth conditions were observed with over the time course. This tendency was confirmed by autoregressive moving average (ARMA) model and mixed effect modeling. All of the coefficients of opening mouths were statistically significant, when closing mouth used as reference. EEG may be useful tool to measure the stress during dental treatment. Stress by sitting on dental chair in horizontal situation was depended on personality traits. Conclusion: Contentious opening mouth may be stressful; however, the amount of stress may be small. The changes can be seen within 18 min. Prolonged chair time for the dental treatment may not be recommended. (Asian Pac J Dent 2019; 19: 45-50.)","PeriodicalId":433454,"journal":{"name":"Asian Pacific Journal of Dentistry","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125115659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Polymerization behavior of bulk-fill and hybrid-type resin composites using different light curing mode 不同光固化方式下大块填充型和杂化型树脂复合材料的聚合行为

Asian Pacific Journal of Dentistry Pub Date : 1900-01-01 DOI: 10.47416/apjod.22-0293

T. Yoshikawa, A. Sadr, Y. Shimada

引用次数: 0

Effect of bleaching on the inside of tooth substrate 漂白对牙基内部的影响

Asian Pacific Journal of Dentistry Pub Date : 1900-01-01 DOI: 10.47416/apjod.21-0286

Yosuke Minato, N. Hiraishi, M. Nakajima, M. Otsuki, J. Tagami

引用次数: 0

Difference in clinical performance between porcelain laminate veneer restoration and high-flow composite resin coating 瓷板贴面修复与高流量复合树脂涂层临床性能的差异

Asian Pacific Journal of Dentistry Pub Date : 1900-01-01 DOI: 10.47416/apjod.21-0281

Mitsuo Nakamura, Haruto Hiraba

引用次数: 0

Antibacterial activity of the probiotic candidate Lactobacillus gasseri against methicillin-resistant Staphylococcus aureus 候选益生菌发酵乳杆菌对耐甲氧西林金黄色葡萄球菌的抑菌活性

Asian Pacific Journal of Dentistry Pub Date : 1900-01-01 DOI: 10.47416/APJOD.20-0271

Takumi Ishikawa, S. Imai, T. Nakano, Tomohiko Terai, T. Okumura, N. Hanada, H. Kawahara

{"title":"Antibacterial activity of the probiotic candidate Lactobacillus gasseri against methicillin-resistant Staphylococcus aureus","authors":"Takumi Ishikawa, S. Imai, T. Nakano, Tomohiko Terai, T. Okumura, N. Hanada, H. Kawahara","doi":"10.47416/APJOD.20-0271","DOIUrl":"https://doi.org/10.47416/APJOD.20-0271","url":null,"abstract":"Purpose: The objective of this study was to verify growth suppression of methicillin-resistant Staphylococcus aureus (MRSA) involved in ventilator-associated pneumonia (VAP) aggravation by the probiotic candidate bacterium Lactobacillus gasseri (L. gasseri) in the oral cavity. Materials and Methods: L. gasseri YIT 12321 (Lg YIT 12321) and MRSA JCM 8702 (MRSA-JCM) were used as test bacteria. Both Lg YIT 12321 and MRSA-JCM were cultured in lactobacilli MRS medium, and MRSA-JCM was also cultured in TS medium anaerobically at 37 ̊C for 18-24 hours. The antibacterial activity of Lg YIT 12321 against MRSAJCM was examined by competition assay and radial diffusion assay (RDA). A fraction obtained from the Lg YIT 12321 culture supernatant by 50% (w/v) saturated ammonium sulfate (50% sat. ammonium) precipitation was examined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). Results: In the competition assay, inhibition of MRSA-JCM proliferation by Lg YIT 12321 was observed. Moreover, it was confirmed that the growth of MRSA-JCM was inhibited by neutralized culture supernatant of Lg YIT 12321 in the RDA, suggesting that the growth of MRSA-JCM was suppressed by an antibacterial substance produced by Lg YIT 12321. Conclusion: Lg YIT 12321 is a candidate probiotic that produces a class II bacteriocin that suppresses the growth of MRSA-JCM. (Asian Pac J Dent 2020; 20: 1-8.)","PeriodicalId":433454,"journal":{"name":"Asian Pacific Journal of Dentistry","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115719119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Discoloration of flowable and universal resin composites immersed in black tea for 30 days 可流动和通用树脂复合材料浸泡在红茶中30天的变色

Asian Pacific Journal of Dentistry Pub Date : 1900-01-01 DOI: 10.47416/APJOD.20-0272

Ayaka Hori-Ishikawa, Y. Ogawa, Ayako Okada, Nana Sakaeda, Daichi Aizawa, M. Hanabusa, K. Ohmori, Takatsugu Yamamoto

{"title":"Discoloration of flowable and universal resin composites immersed in black tea for 30 days","authors":"Ayaka Hori-Ishikawa, Y. Ogawa, Ayako Okada, Nana Sakaeda, Daichi Aizawa, M. Hanabusa, K. Ohmori, Takatsugu Yamamoto","doi":"10.47416/APJOD.20-0272","DOIUrl":"https://doi.org/10.47416/APJOD.20-0272","url":null,"abstract":"Purpose: This study evaluated the discoloration of current flowable and universal resin composites by immersing in black tea over 30 days. Materials and Methods: Three flowable resin composites and three universal resin composites were evaluated. The composites were inserted into a disk-shaped stainless steel mold and properly cured. The surfaces of the composite disks were wet-ground and ultrasonically cleaned. Colors – L*, a*, and b* were measured at the center of disks on a gray background using a spectrophotometer. The disks were immersed in black tea at 37 ̊C for 30 days, and the colors were repeatedly measured at 1, 3, 5, and 30 days of immersion. Color differences ΔE*ab were calculated from the L*, a*, and b* values. Water sorption and solubility of the composites were also measured as per ISO 4049. The results were statistically analyzed, and regression analyses were done between ΔE*ab and ΔL*, Δa*, Δb* or sorption/solubility. Results: All the composites showed observable increases of ΔE*ab within the first 5 days of immersion. Values of ΔE*ab ranged from 0.64 to 4.97, and three composites exhibited values above the clinically acceptable value, 3.3. ΔL* and Δb* revealed strong correlations with ΔE*ab. Both water sorption and solubility had positive correlations with ΔE*ab at 30 days. Conclusion: Tea immersion induced discoloration of the current resin composites. This discoloration was affected most by the change in brightness and difference in its blue-yellow chromaticity, and the level of discoloration was material dependent. (Asian Pac J Dent 2020; 20: 9-15.)","PeriodicalId":433454,"journal":{"name":"Asian Pacific Journal of Dentistry","volume":"209 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122667249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of rhodium plating on the ion dissolution from nickel-titanium and pure nickel wires 镀铑对镍钛线和纯镍线离子溶解的影响

Asian Pacific Journal of Dentistry Pub Date : 1900-01-01 DOI: 10.47416/apjod.22-0290

E. Cho, Z. Kanno, I. Yonemitsu, Hajime Kiyokawa, Nobutaka Ohira, T. Ono, M. Uo

{"title":"Effect of rhodium plating on the ion dissolution from nickel-titanium and pure nickel wires","authors":"E. Cho, Z. Kanno, I. Yonemitsu, Hajime Kiyokawa, Nobutaka Ohira, T. Ono, M. Uo","doi":"10.47416/apjod.22-0290","DOIUrl":"https://doi.org/10.47416/apjod.22-0290","url":null,"abstract":"Purpose: Rhodium-plated orthodontic wires are utilized for esthetic purposes. However, the decline in the corrosion resistance of rhodium (Rh)-plated nickel-titanium (Ni-Ti) wires has been a concern. In this study, Rh-plated nickel (Ni) wires and Ni-Ti orthodontic wires were prepared via electroplating, and the microstructures of the plated layers were investigated. Methods: The surface microstructure and thickness of the plated layers were analyzed using scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDX). The corrosion resistance was tested by immersion into an acidic solution in addition to applying plated and non-plated wires to the oral cavity or subcutaneous tissues of animals. Ni dissolution and distribution into the contacted oral mucosa and implanted subcutaneous tissues were visualized using synchrotron radiated X-ray fluorescence (SR-XRF). Results: In Ni wires, the 1-2 μm plated rhodium layer was formed in contact with the substrate. This layer suppressed the corrosion of the Ni wire in acidic solutions. However, in Ni-Ti wires, defects in the plated layer were observed and subsequently, Ni and Ti dissolution in the acidic solution was enhanced because of galvanic corrosion. In Ni-Ti wires, Ni and Ti could not be detected in the tissues because of their low contents. Conclusion: The plated Rh layer was homogeneously formed in contact with the substrate in Ni wire compared to the plated layer on Ni-Ti wires. For the clinical use in orthodontic treatment, it might be suggested that Rh-plated Ni-Ti wires should be more stable in oral cavity without ion dissolution, however, the effect of dissolved Ni and Ti from Rh-plated Ni-Ti wires would not be a concern due to their extremely lower contents.","PeriodicalId":433454,"journal":{"name":"Asian Pacific Journal of Dentistry","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121240263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Polymerization behavior of resin composites using different irradiance lights 不同辐照度下树脂复合材料的聚合行为

Asian Pacific Journal of Dentistry Pub Date : 1900-01-01 DOI: 10.47416/apjod.20-0275

T. Yoshikawa, A. Sadr, J. Tagami

{"title":"Polymerization behavior of resin composites using different irradiance lights","authors":"T. Yoshikawa, A. Sadr, J. Tagami","doi":"10.47416/apjod.20-0275","DOIUrl":"https://doi.org/10.47416/apjod.20-0275","url":null,"abstract":"Purpose: This study aimed to evaluate the microhardness and hardness ratios of hybrid resin composites using different irradiance lights. Materials and Methods: Light-curing units were light emitting diode (LED) light-curing unit (Demi Ultra). The lightcured resin composites were Clearfil AP-X (shade A3) and Clearfil Photo Bright (shade US). Composite specimens of 2mm thickness were polymerized in Teflon molds using an energy density of 24,000 mJ/cm2. Light irradiances were 1,200 mW/cm2 20 s and 600 mW/cm2 40 s. Just after light curing, the Knoop hardness (KHN) was measured at the top and bottom surfaces of each specimen using a hardness tester. The hardness ratio was calculated as follows: KHN of bottom surface/KHN. All experiments were performed at room temperature of 23 ± 2 ̊C with humidity of 50 ± 10%. Results: Immediately after light curing, the KHN at the bottom surfaces of resin composites was significantly lower than that at the top surfaces for every group (p < 0.05). The 1,200 mW/cm2 20 s showed significantly smaller hardness ratio compared with that of the 600 mW/cm2 40 s for both Clearfil AP-X and Clearfil Photo Bright resin composites (p < 0.05). Conclusion: When the energy density was the same, the polymerization of resin composites at the bottom surface was more inhibited than that of at the top surface using high-irradiance light. (Asian Pac J Dent 2020; 20: 25-28. doi: 10.47416/apjod.20-0275)","PeriodicalId":433454,"journal":{"name":"Asian Pacific Journal of Dentistry","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114327772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tooth sizes and configurations within maxillary dentition 上颌牙列的牙齿大小和结构

Asian Pacific Journal of Dentistry Pub Date : 1900-01-01 DOI: 10.47416/apjod.22-0291

S. Fujita, S. Higuchi, M. Nakatsuka

{"title":"Tooth sizes and configurations within maxillary dentition","authors":"S. Fujita, S. Higuchi, M. Nakatsuka","doi":"10.47416/apjod.22-0291","DOIUrl":"https://doi.org/10.47416/apjod.22-0291","url":null,"abstract":"Purpose: To explore the relationship between tooth sizes and configurations within a single dentition, the mesiodistal and buccolingual crown diameters were measured using a dentition model, and analyzed using statistical methods. Methods: A total of 96 maxillary dental casts were used. The mesiodistal crown diameter, buccolingual crown diameter, and crown area from the maxillary central incisor to the maxillary second molar were determined. The mean, standard deviation, median, coefficient of variation, and Spearman's rank correlation coefficients were determined. Hierarchical cluster analysis was performed to form clusters of maxillary dentitions with similar characteristics. Principal component analysis was performed to explore the characteristics of all 96 cases and each cluster. Furthermore, whether there was a difference between the clusters was asked. Results: Maxillary lateral incisor had a large coefficient of variation and did not show a high correlation coefficient with any of the other teeth. The maxillary dentition was classified into seven groups according to the size of the configuration teeth and the size of the teeth between the tooth types. Furthermore, among the seven groups, there was a group in which the size of the teeth constituting the dentition were in harmony, and a group in which the size of one tooth or tooth type tended to increase while the size of the other tooth or tooth type tended to decrease. Conclusion: The size of teeth in one maxillary dentition is observed within the same tooth type or between different tooth types, suggesting that they influence each other.","PeriodicalId":433454,"journal":{"name":"Asian Pacific Journal of Dentistry","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124000406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bonding of auto-polymerized poly(methyl methacrylate) resin to polyamide thermoplastic resin 自聚合聚甲基丙烯酸甲酯树脂与聚酰胺热塑性树脂的键合

Asian Pacific Journal of Dentistry Pub Date : 1900-01-01 DOI: 10.47416/apjod.19-0266

H. Shimpo, C. Ohkubo

{"title":"Bonding of auto-polymerized poly(methyl methacrylate) resin to polyamide thermoplastic resin","authors":"H. Shimpo, C. Ohkubo","doi":"10.47416/apjod.19-0266","DOIUrl":"https://doi.org/10.47416/apjod.19-0266","url":null,"abstract":"Purpose: Auto-polymerized poly(methyl methacrylate) (PMMA) resin cannot be bonded to polyamide thermoplastic resin. This study evaluated the bonding strengths of auto-polymerized PMMA resin to nylon denture bases using adhesive agents. Materials and Methods: The surfaces of polyamide thermoplastic resin plates were polished using abrasive paper and blasted with 50 μm alumina particles. An adhesive agent, 4-META/MMA-TBB resin (Super-Bond) was used on the surfaces under the following conditions: monomer + catalyst (4:1, Group 1), monomer + catalyst (8:1, Group 2), monomer + catalyst (4:1) + polymer (Group 3), monomer + catalyst (8:1) + polymer (Group 4), treatment with dichloromethane (Group 5), alumina-blasted (Group 6), without treatment (Group 7), and PMMA resin (Group 8). Auto-polymerized PMMA resin was poured into a Teflon ring and polymerized according to the manufacturer’s instructions. After polymerization, the specimens were stored in 37 ̊C distilled water for 24 hours. The specimens for each condition were thermo-cycled for 5,000 cycles. The tensile bond strengths were measured on an autograph at a crosshead speed of 2.0 mm/min. The data obtained (n = 13) were analyzed using a two-way ANOVA and Tukey’s multiple comparisons test (α = 0.05). Results: The bonding strengths of Groups 1 to 4 were significantly higher than for Groups 5 to 7. No significant differences were found among Groups 1-4, although Group 3 had the highest bonding strengths. Conclusion: Auto-polymerized PMMA resin will adhere to polyamide thermoplastic resin using 4-META/ MMA-TBB after alumina-blasting. (Asian Pac J Dent 2019; 19: 65-69.)","PeriodicalId":433454,"journal":{"name":"Asian Pacific Journal of Dentistry","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124529476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0