GC Fuji Ⅸ型及增强型玻璃离子水门汀修复老年楔状缺损活髓牙:材料临床应用可行性1年的随访比较

背景:GC Fuji Ⅸ型玻璃离子水门汀作为楔状缺损的一种充填材料,在临床上越来越受关注,但其与临床常用的增强型玻璃离子水门汀修复楔状缺损效果的比较尚不清楚.目的:比较GC Fuji Ⅸ型玻璃离子水门汀和增强型玻璃离子水门汀两种材料修复老年人楔状缺损的临床疗效.方法:随机将80颗需做楔状缺损修复的患牙分成两组,分别用GC Fuji Ⅸ型玻璃离子水门汀(实验组)和增强型玻璃离子水门汀(对照组)充填,修复后即刻,修复后3,6个月和1年分别对修复体的色泽协调性、边缘密合度、修复体完整度、继发龋的发生以及牙髓症状5个方面进行临床效果评价.结果与结论:在修复后3,6个月及1年的临床评价中,实验组的色泽协调性优于对照组(P<0.05);在修复后的6个月以及1年的疗效观察中,实验组的边缘密合度明显优于对照组(P<0.05);在修复1年后的临床评价中,实验组的修复体完整度优于对照组(P<0.05).说明GC Fuji Ⅸ型玻璃离子是一种充填老年人楔状缺损的理想材料,在1年内效果优于增强型玻璃离子水门汀.     

两种方法修复牙楔状缺损的疗效比较

目的探讨治疗牙楔状缺损行玻璃离子水门汀修复和光固化复合树脂修复的不同效果。方法本研究选取2010年6月至2010年12月到南阳市口腔医院牙科进行治疗的牙楔状缺损患者60例,随机分为A组30例(玻璃离子水门汀组)和B组30例(光固化复合树脂组),统计和观察比较两组患者的牙体修复情况。结果经过平均1年的随防观察,A组共修复患牙38颗,修复成功26颗,成功率达68.4%;B组共修复患牙41颗,修复成功29颗,成功率达70.7%。修复失败者主要表现为充填体松动、脱落、修复体磨损、微渗漏、继发龋齿等。两组间修复成功率进行比较差异无统计学意义(P>0.05)。在牙髓活力改变方面两组比较,A组优于B组;在表面磨损方面两组比较,B组却优于A组,差异有统计学意义(P<0.05)。结论治疗牙楔状缺损时,采用玻璃离子水门汀修复和光固化复合树脂修复均可以取得较高的修复成功率,在临床应用中应根据患牙的具体情况和患者的要求选择合适的治疗方法。     

治疗楔状缺损两种材料修复体的质量和寿命的评估

目的:观察治疗楔状缺损两种材料修复体的质量和寿命。方法:75例509颗楔缺牙分别用光固化复合体和光固化玻璃离子水门汀修复,于修复后1、2、4及8年用改良的USPHS系统评价修复体的质量,评为劣的修复体重做修复计算寿命。结果:光固化复合体和光固化玻璃离子水门汀修复体寿命超过4年的仅有28.6%和26.3%,达到8年的只有3.7%和3.5%,两种材料修复体的优良率均随复查时间的加长急剧下降。玻璃离子组脱落率低于复合体组,差异有显著性。结论:治疗楔状缺损的光固化复合体和光固化玻璃离子水门汀修复体超过2年后质量下降快,寿命短。     

三种材料修复楔状缺损疗效观察

目的：比较光固化树脂。玻璃离子水门汀，氟化玻璃聚合体三种材料修复牙体楔状缺损的临床效果。方法：选择180例患者746颗楔状缺损患者随机分成A、B、C、三组。采用三种不同材料修复充填。A组采用光固化树脂。B组采用玻璃离子水门汀、C组采用氟化玻璃聚合体。共修复了746颗有楔状缺损的患牙。随访观察两年，比较三组效果。结果：采用光固化树脂修复262颗牙，成功223颗。成功率85．1％。采用玻璃离子水门汀修复225颗牙。成功202颗，成功率88．6％。采用氟化玻璃聚合体256颗牙，成功244颗，成功率95．3％。结论：严格掌握操作方法。氟化玻璃聚合体光固化修复牙体楔状缺损远期效果高于另二者，是一种较为理想的楔状缺损修复材料。     

夹层技术修复楔形缺损的临床疗效

目的 观察玻璃离子水门汀夹层技术修复楔形缺损的临床疗效.方法 75例294颗楔形缺损牙随机分成两组,分别采用玻璃离子水门汀结合光固化复合树脂的夹层技术和单纯光固化复合树脂进行修复,观察充填2年后的疗效.结果 玻璃离子夹层技术修复组成功率92.67%,单纯光固化复合树脂修复组成功率81.25%,两组差异有统计学意义(P＜0.01).结论 用玻璃离子水门汀夹层技术修复楔形缺损比单纯用光固化复合树脂修复疗效更理想.     

光固化复合树脂和玻璃离子水门汀修复楔状缺损

目的 评价玻璃离子水门汀和光固化复合树脂修复楔状缺损的临床疗效.方法 对300个楔状缺损牙分别用玻璃离子水门汀、光固化复合树脂修复,观察1-3年的修复效果.结果 光固化复合树脂修复楔状缺损成功率高于玻璃离子修复(P<0.01).结论 光固化复合树脂和玻璃离子都是修复楔状缺损较好的方法.     

Vitapex糊剂与光固化玻璃离子水门汀修补乳磨牙髓室底穿孔疗效观察

目的:观察Vitapex糊剂与光固化玻璃离子水门汀联合修补乳磨牙龋源性髓室底穿孔的临床疗效.方法:选取乳磨牙龋源性髓室底穿孔患者46例,用Vitapex糊剂和光固化玻璃离子水门汀修复髓室底穿孔,并用Vitapex糊剂充填根管,磷酸锌水门汀垫底,银汞合金充填.随访6,12,24个月.结果:6个月成功43例(93.5%).12个月成功40例(87.0%),24个月成功35例(76.1%);穿孔直径≤1 mm组牙齿修复成功率在12,24个月时明显高于直径>1 mm组,差异有统计学意义(P<0.05).结论:用Vitapex糊剂与光固化玻璃离子水门汀联合修补乳磨牙龋源性髓室底穿孔是保存治疗的有效方法.     

不同加压时间对玻璃离子水门汀粘接强度的影响

目的:测定两种玻璃离子水门汀不同加压时间的即刻粘接强度.方法:对70颗离体牙进行牙体预备,暴露牙本质,随机分为2组:Ketac~(TM)Cem Easymix玻璃离子水门汀组(3M组)、TOKUSO玻璃离子水门汀组(TOKUSO组);每组根据加压时间不同再分为7个小组,应用玻璃离子水门汀将钴铬合金铸件与牙本质粘接后分别加压5,10,15,20,25,30,35 min,测定即刻拉伸强度值.结果:两种玻璃离子水门汀对于钴铬合金与牙本质在加压不同时间后的即刻粘接强度比较差异均有显著性意义(P<0.01),均在加压25 min后测得的即刻粘接强度最大.3M加压25 min组比TOKUSO加压25 min组粘接强度大,但是二者之间差异无显著性意义.结论:Ketac~(TM) Cem Easymix玻璃离子水门汀、TOKUSO玻璃离子水门汀临床应用时均应加压至25 min,以获得最大粘接强度.     

三种方法修复前牙中重度缺损的疗效评价

目的:比较光固化玻璃离子水门汀夹层技术、光固化松风氟化玻璃离子夹层技术及单用复合树脂充填前牙中重度缺损的疗效。方法:97例242颗中重度缺损前牙随机分成A、B、C3组。A组用玻璃离子水门汀作夹层复合树脂充填,B组用松风氟化玻璃离子作夹层复合树脂充填,C组单用复合树脂充填。随访2年后评价其疗效。结果:A组成功率87.18%,B组成功率95.35%,C组成功率76.92%。结论:夹层充填技术要优于单纯复合树脂充填,用松风氟化玻璃离子作夹层充填前牙中重度缺损的成功率高于玻璃离子水门汀夹层技术的成功率。     

玻璃离子水门汀加入改良纳米羟基磷灰石后的性能

背景：玻璃离子水门汀具有良好的生物稳定性和持久的氟离子释放性，被用于齿科修复领域的材料，但由于其机械强度较低，局限于前牙等受力较小部位的齿科修复。
　　目的：分析加入8%改良型纳米羟基磷灰石后，而至富士IX 玻璃离子水门汀的抗压强度﹑密合度等物理性能。方法：①分别以而至富士IX 玻璃离子水门汀、加入8%改良型纳米羟基磷灰石的而至富士IX 玻璃离子水门汀及超强玻璃离子充填不锈钢圆柱体，采用万能实验机检测各组抗压强度。②分别以而至富士IX 玻璃离子水门汀、加入8%改良型纳米羟基磷灰石的而至富士IX 玻璃离子水门汀及超强玻璃离子充填人离体牙窝洞，观察各组充填体与牙体间的密合度。③分别以而至富士IX 玻璃离子水门汀、加入8%改良型纳米羟基磷灰石的而至富士IX玻璃离子水门汀及超强玻璃离子充填不锈钢矩形试件，采用万能材料测试机检测各组弯曲强度值。
　　结果与结论：加入改良型纳米羟基磷灰石而至富士IX 玻璃离子水门汀填充试件的抗压强度、密合度及弯曲强度均优于其他两组，并且而至富士IX 玻璃离子水门汀填充试件的抗压强度、密合度及弯曲强度均优于超强玻璃离子填充试件组。表明加入8%的改良型纳米羟基磷灰石的而至富士IX 玻璃离子水门汀抗压强度﹑密合度均有提高。     

酸蚀对树脂加强型玻璃离子抗剪切强度的影响

目的：了解酸蚀和免酸蚀两种情况下光固化树脂加强型玻璃离子水门汀的抗剪切强度是否有差别。方法：收集离体前磨牙30颗，随机平均分为3组。第1组（时照组）：35％磷酸酸蚀30s，冲洗、干燥，涂粘结剂，京津釉质粘结剂粘结托槽。第2组：35％磷酸酸蚀30s，冲洗，湿润，光固化型的Fuji Ortho Lc树脂加强型玻璃离子粘结托槽。第3组：免酸蚀，湿润，光固化型的Fuji Ortho Lc树脂加强型玻璃离子粘结托槽。24h后用电子万能力学实验机时3组进行抗剪切强度测定，并统计牙面上的粘结剂残留量。结果：2、3组间差异有统计学意义；1、3组间差异无统计学意义。结论：树脂加强型玻璃离子水门汀免酸蚀时其粘结强度能达到临床要求，但是酸蚀后粘结强度明显增高。     

玻璃微珠改性双酚A甲基丙烯酸缩水甘油酯复合的树脂充填材料

背景：口腔复合树脂修复材料存在聚合收缩率大和机械强度低等缺点,不能很好地满足临床使用的要求。目的：观察双酚A甲基丙烯酸缩水甘油酯和二甲基丙烯酸三甘醇酯的比例及改性实心玻璃微珠添加量对口腔复合树脂弯曲强度与聚合体积收缩率的影响。方法：以硅烷偶联剂KH-550对实心玻璃微珠进行硅化处理。向双酚A甲基丙烯酸缩水甘油酯与二甲基丙烯酸三甘醇酯配比分别为7／3、6／4、5／5的口腔复合树脂中再分别添加质量分数10％,30％,50％,70％,90％的实心玻璃微珠,机械搅拌均匀后,快速填入模具中固化,设置不添加实心玻璃微珠的树脂作为对照参考,分析口腔复合树脂的机械性能和收缩率。结果与结论：随着实心玻璃微珠添加量的增加,口腔复合树脂的弯曲强度呈先增加后减小的趋势,体积收缩率呈降低趋势：当双酚A甲基丙烯酸缩水甘油酯与二甲基丙烯酸三甘醇酯的比例为5／5、实心玻璃微珠的添加量为70％时,口腔复合树脂的弯曲强度最高,为（88．29±0．66）MPa（P〈0．05）;当双酚A甲基丙烯酸缩水甘油酯与二甲基丙烯酸三甘醇酯的配比为7／3、玻璃微珠添加量为70％时,聚合体积收缩率最小,为0．898％。     

生物活性玻璃对早期人工釉质龋的再矿化*

背景:生物活性玻璃具有良好的生物相容性,且具有抑制口腔致龋细菌和牙周相关细菌及抗牙本质过敏的作用.目的:评价生物活性玻璃促进早期人工釉质龋再矿化的作用.方法:将新鲜拔除的30颗牛切牙制成人工龋模型,将标本在37℃人工脱矿液内脱矿72 h,用扫描电镜观察脱矿后釉质表面的平滑情况,用显微硬度仪测量脱矿后釉质的显微硬度.然后随机分为3组,每组10个.采用pH循环法模拟人口腔环境,将3组标本分别浸泡在生物活性玻璃溶液、氟化钠溶液及人工唾液内,3次/d,10 min/次,循环浸泡20 d,扫描电镜检测标本脱矿及再矿化情况,用显微硬度计检查牙釉质显微硬度.结果与结论:浸泡在生物活性玻璃溶液中的牙釉质表面较浸泡在其他两溶液中的牙釉质表面光滑平整,无空隙存在;浸泡在生物活性玻璃溶液中的牙釉质表面显微硬度高于浸泡在其他两溶液中的牙釉质表面显微硬度(P <0.05).说明生物活性玻璃在体外实验中能促进早期釉质龋的再矿化.     

Effect of ultrasonic excitation on the microtensile bond strength of glass ionomer cements to dentin after different water storage times

The application of ultrasound waves on glass ionomer cement (GIC) surface can accelerate the early setting reaction and improve the mechanical properties of the material, resulting in higher resistance to masticatory forces within a short period of time and thus increasing the clinical longevity of the GIC restoration. In this study, the microtensile bond strength (μTBS) of two high-viscosity GICs (Fuji IX GP and Ketac Molar Easymix) and one resin-modified GIC (RMGIC-Vitremer) to dentin was tested after ultrasonic excitation and water storage. GIC blocks were built up on coronal dentin either receiving or not receiving a 30-s ultrasound application during the material initial setting. After storage in water for either 24 h or 30 d, beam-shaped specimens with a cross-sectional area of approximately 1.0 mm² were cut perpendicular to GIC/dentin interface and tested to failure. At 24 h, the ultrasonically set Ketac Molar had significantly higher (p < 0.05) μTBS than the cement set conventionally. Chemically set Ketac Molar presented significantly higher μTBS after the longer water storage (p < 0.05). The RMGIC presented the highest μTBS regardless of ultrasonic excitation and storage period. In conclusion, ultrasound application to Ketac Molar improved its adhesion to dentin, particularly within the first 24 h after setting. Clinically, it seems that ultrasonic excitation can contribute to prevent retention loss of restoration at early stages of GIC setting reaction.     

In vivo evaluation of bioactive glass foams associated with platelet-rich plasma in bone defects

The objective of this study was to evaluate the use of bioactive glass foams produced by the sol-gel process, associated or not with platelet-rich plasma (PRP), in the regeneration of bone defects. Mongrel dogs (n = 14) were divided into two groups after having their superior first premolar removed. A small piece of vestibular bone from the alveolus was intentionally removed. The area was filled with bioactive glass foam produced by the sol-gel method. Two groups were tested: group A was the glass foam; group B was the same material associated with PRP, prepared from each animal. The other side of alveolar bone was used as a control group, in which the bone defect did not receive any biomaterial. The thickness of the bone area was measured before and after the intervention. After a period of 60 days implantation, the right and left bones were measured again, and a bone biopsy on both regions was conducted for histological analysis. The findings show an increase of bone thickness for both materials implanted compared to the control group. Group B, implanted with bioactive glass foam associated with PRP, showed a thicker bone area compared to Group A. Histological results indicate bone formation for both materials used. However, the bioactive glass associated with PRP gave rise to a more mature bone formation. These results show that bioactive glass foams processed by a sol-gel method is effective in maintaining the thickness of the alveolar ridge, and the use of PRP associated with the foams improve bone formation.     

玻璃纤维桩与金属桩核修复牙体缺损的比较

背景：当冠部牙体组织大面积缺损单纯充填、全冠及嵌体疗效不佳时,桩核系统使残根、残冠的修复成为可能。目的：分析玻璃纤维桩和铸造金属桩在牙体缺损修复中的临床效果。方法：将106例患者共160颗患牙随机分为2组,经完善的根管治疗后,分别采用玻璃纤维桩(n=80)和铸造金属桩(n=80)制作桩核,金瓷冠修复,随访9-33个月,评价两组临床修复效果。结果与结论：玻璃纤维桩治疗成功78颗,桩松动2颗,治疗成功率98%;铸造金属桩治疗成功71颗,冠折1颗,根折4颗,桩脱落4颗,治疗成功率89%,两组治疗成功率比较差异有显著性意义(P<0.05)。表明玻璃纤维桩在牙体缺损修复中具有操作方便、色泽好且不易造成根折等优点,治疗效果优于金属铸造桩核修复。     

Bioactive glass containing 90% SiO2 in hard tissue engineering: An in vitro and in vivo characterization study

Bioactive glass has been proved to have many applications in bioengineering due to its bone regenerative properties. In this work, an innovative, highly resorbable bioactive glass containing 90% SiO₂ (BG90) to be used as a bone substitute was developed. The BG90 was synthetized by the sol–gel process with the dry step at room temperature. The biomaterial showed in vitro and in vivo bioactivities even with silica content up to 90%. Moreover, the BG90 presented high porosity and surface area due to its homogenously interconnected porous network. In vitro, it was observed to have high cell viability and marked osteoblastic differentiation of rat bone marrow‐derived cells when in contact with BG90 ion extracts. The BG90 transplantation into rat tibia defects was analysed at 1, 2, 3, 4, 7, and 10 weeks post‐operatively and compared with the defects of negative (no graft) and positive (autogenous bone graft) controls. After 4 weeks of grafting, the BG90 was totally resorbed and induced higher bone formation than did the positive control. Bone morphogenetic protein 2 (BMP‐2) expression at the grafting site peaked at 1 week and decreased similarly after 7 weeks for all groups. Only the BG90 group was still exhibiting BMP‐2 expression in the last experimental time. Our data demonstrated that the BG90 could be an attractive candidate to provide useful approaches in hard‐tissue bioengineering.     

Aspects of the application of glass ionomer cements

The effect of method of handling on the properties of some glass ionomer cements has been investigated. The effects of different storage conditions and contamination by saliva on strength and adhesion to dentine were assessed. There was no consistent pattern of results for all five cement products. Some were adversely affected by exposure to moisture soon after setting; in some instances, contamination of the specimen mould had a deleterious effect on mechanical properties. The cements also showed great variation in their ability to adhere to dentine and in their responses to various regimes of pretreating the dentine. If these products are to be widely used in the treatment of the primary dentition, great care will be needed In attempting to handle the materials under ideal conditions.     

Cuspal movement and microleakage around reinforced glass ionomer cements

The effect of restoration of mesio-occluso-distal cavities in molar teeth with reinforced glass ionomer cements on cuspal flexure in vitro is reported. Measurements of cuspal flexure using linear variable displacement transducers were carried out for 90 min after the placement of two types of reinforced glass ionomer cement. The measurements demonstrated that no movement occurred except in cases where the materials were allowed to dehydrate. Under these circumstances the opposing cusps moved toward one another. This movement was observed to be directly related to time. Microleakage was very much less than that observed for composite materials evaluated under the same test conditions.