Objective To assess the microleakage of Class V restorations made with two resin-modified glass ionomer cements （RMGICs） and two polyacid-modified composite resins （PMCRs）. Methods Restorations of the four materia...Objective To assess the microleakage of Class V restorations made with two resin-modified glass ionomer cements （RMGICs） and two polyacid-modified composite resins （PMCRs）. Methods Restorations of the four materials （ GC Fuji Ⅱ LC, Vitremer^TM, Dyract AP and F2000^TM ） were placed in facial Class V cavity preparations in forty noncarious human molar teeth. Teeth were randomly assigned to 4 experimental groups of 10 teeth each. After thermal cycling（ ×20, 5 -55℃ ） , the interface between dentin and restorations was spattercoated with gold and observed under scanning electron microscopy （SEM）. Then the square and average width of margin gaps of central 1/3 interface were recorded with image analysis software. Results The data indicated no significant differences between all the restorative materials for both occlusal and gingival margins. Further analysis revealed there were statistically significant differences between occlusal margins and gingival margins for VitremerTM and Dyract AP, respectively. Conclusion None of the tested materials guaranteed margins free of microleakage. Resin-modified glass ionomer cements showed similar margin gaps to the polyacid-modified composite resins tested.展开更多
To evaluate the shear bond strength（SBS） and bond failure interface after the debonding of orthodontic brackets with a resin-modified glass ionomer cement（RMGIC） under six bonding conditions, 140 premolar teeth we...To evaluate the shear bond strength（SBS） and bond failure interface after the debonding of orthodontic brackets with a resin-modified glass ionomer cement（RMGIC） under six bonding conditions, 140 premolar teeth were randomly divided into seven groups. The brackets of all groups, except for control group, were bonded using a RMGIC. The teeth were debonded using a universal testing machine. The shear bond strength, adhesive remnant index （ARI） and enamel fracture were examined for each debonding. A significant difference existed in SBS under wet and dry conditions in two groups of Fuji Ortho LC. Different degree of enamel fracture was seen in groups of Fuji Ortho LC（dry/37% phosphoric acid treated） after debonding. Bond failed predominantly at the enamel-adhesive interface, except for phosphoric acid treated groups. The RMGIC achieve a clinically effective adhesion in orthodontics under different bonding conditions.展开更多
A resin-modified glass-ionomer cement (RMGIC) was studied from a computational point of view. We suggest terpolymer formation by reaction of fixation through a combination of acrylic acid (AA), itaconic acid (IA) and ...A resin-modified glass-ionomer cement (RMGIC) was studied from a computational point of view. We suggest terpolymer formation by reaction of fixation through a combination of acrylic acid (AA), itaconic acid (IA) and an aminoacid derivative (AAD) in different positions. We found that AAD-AA-IA is thermodynamically more stable, but AA-IA-AAD is the combination which can react with glycidyl methacrylate (GM) to form a grafted polymer with two pendant methacrylate groups which can be used later in the process of light-curing. A RMGIC contains a glass powder of calcium-fluoroaluminosilicate acting as the source of cross linking, and for this reason, we have optimized two intramolecular Al3+ tricarboxylate complexes (salt-bridges) formed from the most stable grafted polymers. A possible reaction mechanism for the addition of (GM) to copolymer is proposed.展开更多
目的:评价iRoot BP Plus作为根尖倒充填材料的临床疗效以及IL-1β的基因表达。方法:收集根尖周久治不愈病例,共60例,均为前牙,采用根管倒充填.将其随机均分为3组,分别使用iRoot BP Plus、玻璃离子水门汀、复合树脂3种根管倒充填糊剂,在...目的:评价iRoot BP Plus作为根尖倒充填材料的临床疗效以及IL-1β的基因表达。方法:收集根尖周久治不愈病例,共60例,均为前牙,采用根管倒充填.将其随机均分为3组,分别使用iRoot BP Plus、玻璃离子水门汀、复合树脂3种根管倒充填糊剂,在2年时检测各组临床疗效和IL-1βmRNA的基因表达,进行统计学的分析处理。结果:iRoot BP Plus能有效治愈难治性根尖周炎。IL-1βmRNA在玻璃离子水门汀(3.26±0.04)、复合树脂充填组牙龈中的表达(4.57±0.02)显著高于iRoot BP Plus牙龈(1.32±0.02)(P<0.01)。结论:iRoot BP Plus作为根管倒充填材料具有好的临床疗效,是一种较理想的治疗方法。展开更多
The purpose of this study was to compare the sealing ability and marginal adaptation of four re-storative materials (MTA, Biodentine, portlant cement, and resin modified glass ionomer cement) used to repair iatrogenic...The purpose of this study was to compare the sealing ability and marginal adaptation of four re-storative materials (MTA, Biodentine, portlant cement, and resin modified glass ionomer cement) used to repair iatrogenic furcation perforations. Eighty-four molars were treated endodontically, perforated in the middle of the pulp chamber floor with a round bur and separated randomly into 4 groups of 20 teeth each, while 4 teeth were used as positive and negative controls. The teeth were embedded in a moistened flower sponge and the perforations were filled with the appropriate restorative materials: Group 1: Biodentine;Group 2: MTA Angelus;Group 3: GC Fuji lining LC Paste Pak;Group 4: Aquafix Portland cement. The teeth remained in the soaked sponge for 28 days and then were submerged in basic fuchsine solution 1% for 48 hours. Dye penetration was evaluated after longitudinal sectioning of the teeth. Statistical analysis revealed that perforations restored with MTA exhibited the least microleakage with statistically significant difference among the other three groups (p < 0.05). The worst sealing ability was observed in the teeth restored with Aquafix Portland cement. No statistically significant difference was found between the groups of Biodentine and FC Fuji Lining Paste (p = 0.066).展开更多
To evaluate the retention properties of the novel ‘C＇-shaped molar bands at a laboratory level. Resin-modified glass ionomer cement（RMGIC） was used as a luting agent for the novel C-shaped molar band. The mechanic...To evaluate the retention properties of the novel ‘C＇-shaped molar bands at a laboratory level. Resin-modified glass ionomer cement（RMGIC） was used as a luting agent for the novel C-shaped molar band. The mechanical properties of the band were examined and the retention performance was characterized in the mesial, distal and vertical directions. A clinical trial was conducted using a spilt-mouth design on 50 patients. The novel C-shaped molar bands fit most molars without a repeated try-in process.The use of both nanoHA coating and RMGIC enhanced the tensile（8.00 ± 1.8 MPa） and shear strengths（27.17 ± 8.6 MPa） of the molar bands, leading to high retention in vertical, mesial and distal directions（ p 〈 0.001）. In clinical trials, the C-shaped molar bands had a failure rate（15%） comparable to that of traditional bands, and 93% of the failed bands demonstrated an adhesive remnant index score of 0, corroborating the observation that no luting agent residue remained on the tooth surface in most cases. The novel C-shaped molar bands appear to be a promising appliance that requires further clinical investigations, and may be used effectively in orthodontics.展开更多
目的比较玻璃离子水门汀与流动树脂垫底对深龋近髓磨牙充填后的疼痛及术后敏感性。方法120颗深龋近髓磨牙,随机分为对照组,玻璃离子水门汀组和流动树脂组,每组40颗患牙。对照组采用dycal护髓,玻璃离子水门汀组采用dycal护髓和玻璃离子...目的比较玻璃离子水门汀与流动树脂垫底对深龋近髓磨牙充填后的疼痛及术后敏感性。方法120颗深龋近髓磨牙,随机分为对照组,玻璃离子水门汀组和流动树脂组,每组40颗患牙。对照组采用dycal护髓,玻璃离子水门汀组采用dycal护髓和玻璃离子水门汀垫底,流动树脂组采用dycal护髓和流动树脂垫底,酸蚀粘接后,3组上层均加压充填3M ESPE Filtek^(TM)P60复合树脂。分别于修复后1天,1周,1个月,3个月采用疼痛程度标尺(Visual Analog scales,VAS)记录自觉疼痛程度,采用Ryge评价标准记录对压缩空气刺激的敏感性。结果术后1天、1周、1个月和3个月,对照组与两个实验组之间自觉疼痛程度上差异有统计学意义(P<0.05),各观察期两实验组之间自觉疼痛程度差异无统计学意义(P>0.05)。术后1天和1周,3组之间的术后敏感发生率差异无统计学意义(P>0.05),术后1个月和3个月,玻璃离子水门汀组和流动树脂组与对照组之间差异有统计学意义(P<0.05),而玻璃离子组与流动树脂组之间差异没有统计学意义(P>0.05)。结论在深龋近髓磨牙充填中,双垫底治疗可以降低术后疼痛以及敏感的发生,玻璃离子水门汀和流动树脂之间没有本质区别。展开更多
目的:探讨树脂水门汀与玻璃离子粘结剂在牙体缺损修复中的临床疗效及对龈沟液TNF-α,IL-6,CRP炎症因子水平的影响。方法:选取2022年4月至2023年5月在解放军总医院京北医疗区、武汉市第九医院等多中心口腔科就诊的98例牙体缺损患者,建立...目的:探讨树脂水门汀与玻璃离子粘结剂在牙体缺损修复中的临床疗效及对龈沟液TNF-α,IL-6,CRP炎症因子水平的影响。方法:选取2022年4月至2023年5月在解放军总医院京北医疗区、武汉市第九医院等多中心口腔科就诊的98例牙体缺损患者,建立编号系统,使用随机数表生成序列,将患者分为树脂水门汀组(A组)和玻璃离子粘结剂组(B组),各49例。两组患者均采用相应的材料进行牙体缺损修复,观察并记录修复后的牙龈出血率、牙龈炎、牙龈变色、出血指数(BI)、探诊深度(PD)、牙菌斑指数(PLI)、牙齿美观度评分[红色美学指数(PES)]等指标,以及龈沟液TNF-α,IL-6,CRP炎症因子水平。结果:修复后,A组的牙龈出血率(修复后3个月:14.3%vs 32.7%,χ^(2)=4.602,P=0.032;修复后6个月:12.2%vs 28.6%,χ^(2)=4.021,P=0.045;修复后12个月:4.1%vs 16.3%,χ^(2)=4.009,P=0.045)、牙龈炎发生率(修复后12个月:12.2%vs 28.6%,χ^(2)=4.167,P=0.041)、牙龈变色程度(修复后3个月:无89.8%、轻10.2%vs无79.6%、轻16.3%和中4.1%,χ^(2)=4.118,P=0.039;修复后6个月:无83.7%、轻14.3%和中2.0%vs无65.3%、轻24.5%、中8.2%和重2.0%,χ^(2)=7.835,P=0.005;修复后12个月:无77.6%、轻18.4%、中4.1%vs无51.0%、轻30.6%、中12.2%、重4.1%、极重2.0%,χ^(2)=12.467,P<0.001)、BI(修复后3个月:19.7±6.7 vs 26.3±8.1,t=4.012,P<0.001;修复后6个月:13.6±5.4 vs 21.1±7.2,t=5.421,P<0.001;修复后12个月:10.2±4.3 vs 17.3±6.1,t=6.011,P<0.001)、PD(修复后3个月:2.4±0.6 vs 2.9±0.7,t=3.621,P<0.001;修复后6个月:2.1±0.5 vs 2.6±0.6,t=4.231,P<0.001;修复后12个月:1.9±0.4 vs 2.4±0.5,t=5.142,P<0.001)、PLI(修复后3个月:21.6±7.2 vs 28.4±8.6,t=3.921,P<0.001;修复后6个月:15.4±6.1 vs 23.2±7.9,t=5.011,P<0.001;修复后12个月:12.1±5.2 vs 23.2±7.9,t=5.821,P<0.001)等指标均低于B组;A组的PES评分高于B组(修复后3个月:6.5±1.4 vs 5.7±1.5,t=2.521,P=0.014;修复后6个月:8.2±1.6 vs 7.1±1.7,t=3.011,P<0.001;修复后12个月:9.4±1.8 vs 8.2±1.9,t=3.421,P<0.001);A组的龈沟液TNF-α(修复后3个月:5.32±1.45 vs 8.69±2.28,t=8.731,P<0.001;修复后6个月:4.76±1.23 vs 8.12±2.09,t=9.699,P<0.001;修复后12个月:4.51±1.11 vs 7.85±1.98,t=10.300,P<0.001),IL-6(修复后3个月:3.45±0.89 vs 5.79±1.39,t=9.924,P<0.001;修复后6个月:3.12±0.76 vs 5.23±1.24,t=10.156,P<0.001;修复后12个月:2.98±0.71 vs 4.98±1.15,t=10.359,P<0.001),CRP(修复后3个月:2.01±0.52 vs 3.27±0.79,t=9.326,P<0.001;修复后6个月:1.85±0.47 vs 3.01±0.74,t=9.263,P<0.001;修复后12个月:1.78±0.44 vs 2.89±0.71,t=9.302,P<0.001)水平均低于B组。结论:树脂水门汀在牙体缺损修复中具有较好的美学疗效,能够有效改善患者的口腔健康和生活质量,同时能够降低龈沟液中的炎症因子水平,减少牙周炎的发生风险。展开更多
文摘Objective To assess the microleakage of Class V restorations made with two resin-modified glass ionomer cements （RMGICs） and two polyacid-modified composite resins （PMCRs）. Methods Restorations of the four materials （ GC Fuji Ⅱ LC, Vitremer^TM, Dyract AP and F2000^TM ） were placed in facial Class V cavity preparations in forty noncarious human molar teeth. Teeth were randomly assigned to 4 experimental groups of 10 teeth each. After thermal cycling（ ×20, 5 -55℃ ） , the interface between dentin and restorations was spattercoated with gold and observed under scanning electron microscopy （SEM）. Then the square and average width of margin gaps of central 1/3 interface were recorded with image analysis software. Results The data indicated no significant differences between all the restorative materials for both occlusal and gingival margins. Further analysis revealed there were statistically significant differences between occlusal margins and gingival margins for VitremerTM and Dyract AP, respectively. Conclusion None of the tested materials guaranteed margins free of microleakage. Resin-modified glass ionomer cements showed similar margin gaps to the polyacid-modified composite resins tested.
文摘To evaluate the shear bond strength（SBS） and bond failure interface after the debonding of orthodontic brackets with a resin-modified glass ionomer cement（RMGIC） under six bonding conditions, 140 premolar teeth were randomly divided into seven groups. The brackets of all groups, except for control group, were bonded using a RMGIC. The teeth were debonded using a universal testing machine. The shear bond strength, adhesive remnant index （ARI） and enamel fracture were examined for each debonding. A significant difference existed in SBS under wet and dry conditions in two groups of Fuji Ortho LC. Different degree of enamel fracture was seen in groups of Fuji Ortho LC（dry/37% phosphoric acid treated） after debonding. Bond failed predominantly at the enamel-adhesive interface, except for phosphoric acid treated groups. The RMGIC achieve a clinically effective adhesion in orthodontics under different bonding conditions.
文摘A resin-modified glass-ionomer cement (RMGIC) was studied from a computational point of view. We suggest terpolymer formation by reaction of fixation through a combination of acrylic acid (AA), itaconic acid (IA) and an aminoacid derivative (AAD) in different positions. We found that AAD-AA-IA is thermodynamically more stable, but AA-IA-AAD is the combination which can react with glycidyl methacrylate (GM) to form a grafted polymer with two pendant methacrylate groups which can be used later in the process of light-curing. A RMGIC contains a glass powder of calcium-fluoroaluminosilicate acting as the source of cross linking, and for this reason, we have optimized two intramolecular Al3+ tricarboxylate complexes (salt-bridges) formed from the most stable grafted polymers. A possible reaction mechanism for the addition of (GM) to copolymer is proposed.
文摘目的:评价iRoot BP Plus作为根尖倒充填材料的临床疗效以及IL-1β的基因表达。方法:收集根尖周久治不愈病例,共60例,均为前牙,采用根管倒充填.将其随机均分为3组,分别使用iRoot BP Plus、玻璃离子水门汀、复合树脂3种根管倒充填糊剂,在2年时检测各组临床疗效和IL-1βmRNA的基因表达,进行统计学的分析处理。结果:iRoot BP Plus能有效治愈难治性根尖周炎。IL-1βmRNA在玻璃离子水门汀(3.26±0.04)、复合树脂充填组牙龈中的表达(4.57±0.02)显著高于iRoot BP Plus牙龈(1.32±0.02)(P<0.01)。结论:iRoot BP Plus作为根管倒充填材料具有好的临床疗效,是一种较理想的治疗方法。
文摘The purpose of this study was to compare the sealing ability and marginal adaptation of four re-storative materials (MTA, Biodentine, portlant cement, and resin modified glass ionomer cement) used to repair iatrogenic furcation perforations. Eighty-four molars were treated endodontically, perforated in the middle of the pulp chamber floor with a round bur and separated randomly into 4 groups of 20 teeth each, while 4 teeth were used as positive and negative controls. The teeth were embedded in a moistened flower sponge and the perforations were filled with the appropriate restorative materials: Group 1: Biodentine;Group 2: MTA Angelus;Group 3: GC Fuji lining LC Paste Pak;Group 4: Aquafix Portland cement. The teeth remained in the soaked sponge for 28 days and then were submerged in basic fuchsine solution 1% for 48 hours. Dye penetration was evaluated after longitudinal sectioning of the teeth. Statistical analysis revealed that perforations restored with MTA exhibited the least microleakage with statistically significant difference among the other three groups (p < 0.05). The worst sealing ability was observed in the teeth restored with Aquafix Portland cement. No statistically significant difference was found between the groups of Biodentine and FC Fuji Lining Paste (p = 0.066).
基金Funded by Department of Education,National Natural Science Foundation of China(No.81170960)Heilongjiang Province(No.11531204)+1 种基金Department of Health,Heilongjiang Province(No.2006-123)Youth Foundation of the Second Affiliated Hospital of Harbin Medical University(No.QN2006-13)
文摘To evaluate the retention properties of the novel ‘C＇-shaped molar bands at a laboratory level. Resin-modified glass ionomer cement（RMGIC） was used as a luting agent for the novel C-shaped molar band. The mechanical properties of the band were examined and the retention performance was characterized in the mesial, distal and vertical directions. A clinical trial was conducted using a spilt-mouth design on 50 patients. The novel C-shaped molar bands fit most molars without a repeated try-in process.The use of both nanoHA coating and RMGIC enhanced the tensile（8.00 ± 1.8 MPa） and shear strengths（27.17 ± 8.6 MPa） of the molar bands, leading to high retention in vertical, mesial and distal directions（ p 〈 0.001）. In clinical trials, the C-shaped molar bands had a failure rate（15%） comparable to that of traditional bands, and 93% of the failed bands demonstrated an adhesive remnant index score of 0, corroborating the observation that no luting agent residue remained on the tooth surface in most cases. The novel C-shaped molar bands appear to be a promising appliance that requires further clinical investigations, and may be used effectively in orthodontics.
文摘目的比较玻璃离子水门汀与流动树脂垫底对深龋近髓磨牙充填后的疼痛及术后敏感性。方法120颗深龋近髓磨牙,随机分为对照组,玻璃离子水门汀组和流动树脂组,每组40颗患牙。对照组采用dycal护髓,玻璃离子水门汀组采用dycal护髓和玻璃离子水门汀垫底,流动树脂组采用dycal护髓和流动树脂垫底,酸蚀粘接后,3组上层均加压充填3M ESPE Filtek^(TM)P60复合树脂。分别于修复后1天,1周,1个月,3个月采用疼痛程度标尺(Visual Analog scales,VAS)记录自觉疼痛程度,采用Ryge评价标准记录对压缩空气刺激的敏感性。结果术后1天、1周、1个月和3个月,对照组与两个实验组之间自觉疼痛程度上差异有统计学意义(P<0.05),各观察期两实验组之间自觉疼痛程度差异无统计学意义(P>0.05)。术后1天和1周,3组之间的术后敏感发生率差异无统计学意义(P>0.05),术后1个月和3个月,玻璃离子水门汀组和流动树脂组与对照组之间差异有统计学意义(P<0.05),而玻璃离子组与流动树脂组之间差异没有统计学意义(P>0.05)。结论在深龋近髓磨牙充填中,双垫底治疗可以降低术后疼痛以及敏感的发生,玻璃离子水门汀和流动树脂之间没有本质区别。
文摘目的:探讨树脂水门汀与玻璃离子粘结剂在牙体缺损修复中的临床疗效及对龈沟液TNF-α,IL-6,CRP炎症因子水平的影响。方法:选取2022年4月至2023年5月在解放军总医院京北医疗区、武汉市第九医院等多中心口腔科就诊的98例牙体缺损患者,建立编号系统,使用随机数表生成序列,将患者分为树脂水门汀组(A组)和玻璃离子粘结剂组(B组),各49例。两组患者均采用相应的材料进行牙体缺损修复,观察并记录修复后的牙龈出血率、牙龈炎、牙龈变色、出血指数(BI)、探诊深度(PD)、牙菌斑指数(PLI)、牙齿美观度评分[红色美学指数(PES)]等指标,以及龈沟液TNF-α,IL-6,CRP炎症因子水平。结果:修复后,A组的牙龈出血率(修复后3个月:14.3%vs 32.7%,χ^(2)=4.602,P=0.032;修复后6个月:12.2%vs 28.6%,χ^(2)=4.021,P=0.045;修复后12个月:4.1%vs 16.3%,χ^(2)=4.009,P=0.045)、牙龈炎发生率(修复后12个月:12.2%vs 28.6%,χ^(2)=4.167,P=0.041)、牙龈变色程度(修复后3个月:无89.8%、轻10.2%vs无79.6%、轻16.3%和中4.1%,χ^(2)=4.118,P=0.039;修复后6个月:无83.7%、轻14.3%和中2.0%vs无65.3%、轻24.5%、中8.2%和重2.0%,χ^(2)=7.835,P=0.005;修复后12个月:无77.6%、轻18.4%、中4.1%vs无51.0%、轻30.6%、中12.2%、重4.1%、极重2.0%,χ^(2)=12.467,P<0.001)、BI(修复后3个月:19.7±6.7 vs 26.3±8.1,t=4.012,P<0.001;修复后6个月:13.6±5.4 vs 21.1±7.2,t=5.421,P<0.001;修复后12个月:10.2±4.3 vs 17.3±6.1,t=6.011,P<0.001)、PD(修复后3个月:2.4±0.6 vs 2.9±0.7,t=3.621,P<0.001;修复后6个月:2.1±0.5 vs 2.6±0.6,t=4.231,P<0.001;修复后12个月:1.9±0.4 vs 2.4±0.5,t=5.142,P<0.001)、PLI(修复后3个月:21.6±7.2 vs 28.4±8.6,t=3.921,P<0.001;修复后6个月:15.4±6.1 vs 23.2±7.9,t=5.011,P<0.001;修复后12个月:12.1±5.2 vs 23.2±7.9,t=5.821,P<0.001)等指标均低于B组;A组的PES评分高于B组(修复后3个月:6.5±1.4 vs 5.7±1.5,t=2.521,P=0.014;修复后6个月:8.2±1.6 vs 7.1±1.7,t=3.011,P<0.001;修复后12个月:9.4±1.8 vs 8.2±1.9,t=3.421,P<0.001);A组的龈沟液TNF-α(修复后3个月:5.32±1.45 vs 8.69±2.28,t=8.731,P<0.001;修复后6个月:4.76±1.23 vs 8.12±2.09,t=9.699,P<0.001;修复后12个月:4.51±1.11 vs 7.85±1.98,t=10.300,P<0.001),IL-6(修复后3个月:3.45±0.89 vs 5.79±1.39,t=9.924,P<0.001;修复后6个月:3.12±0.76 vs 5.23±1.24,t=10.156,P<0.001;修复后12个月:2.98±0.71 vs 4.98±1.15,t=10.359,P<0.001),CRP(修复后3个月:2.01±0.52 vs 3.27±0.79,t=9.326,P<0.001;修复后6个月:1.85±0.47 vs 3.01±0.74,t=9.263,P<0.001;修复后12个月:1.78±0.44 vs 2.89±0.71,t=9.302,P<0.001)水平均低于B组。结论:树脂水门汀在牙体缺损修复中具有较好的美学疗效,能够有效改善患者的口腔健康和生活质量,同时能够降低龈沟液中的炎症因子水平,减少牙周炎的发生风险。
