两种含氟流动树脂对变异链球菌抑制作用的 体外实验研究

目的 体外比较2种含氟流动树脂Beautifil Flow Plus F00(F00)和Dyad Flow(DF)对变异链球菌生长的抑制作用.方法 选取含氟流动树脂F00、DF和不含氟树脂Valux(Va),制备直径10mm,厚1mm的样本,每组各13个,共39个.将样本悬吊到含有变异链球菌菌液的高糖轻唾液体培养基中,分别在第1、2、7d对各组10个样本表面附着菌落进行计数,另3个样本采用激光共聚焦扫描显微镜观察生物膜形成情况,比较各组样本表面细菌粘附量和生物膜内的活菌百分比.结果 F00组、DF组、Va组表面细菌粘附量均为1d<2d<7d,不同时间点之间有显著性差异(P<0.01),同一时间点的细菌粘附量为F00组相似文献   

不同含氟试剂的热凝树脂释氟率的比较研究

目的比较不同含氟试剂的热凝树脂释氟率,为寻找适宜的预防义齿基牙龋的氟试剂和氟含量提供理论依据。方法将NaF、Na2PO3F、CaF23种试剂分别制成含氟5%、10%、15%、20%的热凝树脂块(聚甲基丙烯酸甲酯),于100ml去离子水中浸泡。选择电极法测定各浸泡液中氟释放量。结果同浓度下各含氟试剂块氟释放量为NaF>Na2PO3F>CaF2,且含氟浓度越高氟释放量也越大。结论各含氟树脂块均能释放氟离子。     

2种含氟窝沟封闭剂氟释放的体外研究

目的:观察和比较2种含氟窝沟封闭剂在人工唾液中的释氟情况.方法:将2种含氟窝沟封闭剂各制备5个6 mm×1.5 mm的盘状标本,浸入12 mL人工唾液中,恒温37℃.采用氟离子选择性电极法,分别于第1、2、3、7、14、21、28、35天测定2种窝沟封闭剂氟离子的释放量.结果:2种含氟窝沟封闭剂均在第1天的氟释放量最高,然后1周内急剧降低,在14～35 d内维持于稳定水平.在各时间点,玻璃离子封闭剂氟释放量均高于含氟树脂封闭剂,差异有统计学意义(P＜0.01).结论:新型含氟树脂窝沟封闭剂与玻璃离子封闭剂均能够作为氟库在一定时间内持续缓慢地向周围液体环境释放氟离子,对于窝沟封闭剂的防龋性能可能具有潜在的增强作用.     

抗菌季铵盐单体对含氟窝沟封闭剂氟释放的影响

目的:将季铵盐抗菌单体甲基丙烯酰氧乙基一正十六烷基一二甲基氯化铵(DMAE-CB)添加到含氟窝沟封闭剂Helioseal F中,考察这种季铵盐阳离子单体的添加对氟离子的释放是否会造成影响。方法:将DMAE-CB添加到商品含氟封闭剂Helioseal F中作为实验组;未添加抗菌单体的Helioseal F则作为阴性对照,利用氟离子选择性电极研究2组封闭剂在去离子水中的氟释放情况。结果:2组封闭剂在不同时间点测得的氟释放量之间均没有显著性的统计学差异,且2组材料氟释放的方式是类似的,初期的大量释放和较长时间的低水平持续释放。结论:窝沟封闭剂Helioseal F中少量的添加DMAE-CB并没有影响体外环境中氟离子在去离子水中的释放情况,通过添加季铵盐抗菌单体DMAE-CB以改善含氟封闭剂相对长期有效的抗菌性能具备一定的可行性。     

含氟充填材料释氟吸氟和再释氟的研究

目的 为了研究含氟充填材料能否长期稳定释放氟而发挥抗龋效能,本文观察了玻璃离子水门汀和含氟复合树脂在用含氟牙膏处理前后两个时期的释氟情况。方法 第一阶段,将玻璃离子水门汀和含氟复合树脂各６个标本,分别浸泡于去离子水中,测定其在不同时间氟的放量;第二阶段。用含氟牙膏处理各标本后,再测定其在不同时间氟的释放量。结果 当这两允填材料释氟水平降低后,用含氟牙膏处理,琪 释放量明显回升     

用于正畸托槽的氟化钠微胶囊释氟性能研究

目的比较改良型含氟正畸托槽中氟化钠微胶囊的长期氟释放情况。方法将氟化钠微胶囊及普通氟化钠分别按15％比例与树脂改良型玻璃离子水门汀（GC）混合,填充在改良型正畸托槽内,测定在50d内氟的释放量。结果氟化钠微胶囊组氟释放速度缓慢持续,曲线较平缓,氟化钠组在2d后释氟浓度大幅度下降,30d后低于氟化钠微胶囊组,差异有统计学意义（P〈0．05）。结论氟化钠微胶囊较普通氟化钠更适合用作缓释型含氟改良托槽。     

含氟牙釉质粘接剂释氟的实验研究

目的：研究国产含氟牙釉质粘接剂的释氟性能。方法：制备含氟牙釉质粘接剂I型和Ⅱ型的测试标本，以ORION720型离子选择性氟电极、参比电极测试氟离子浓度。结果：I型及Ⅱ型含氟牙釉质粘接剂均有氟离子释放，且在第一个24h后氟离子浓度下降显著，可维持21d左右；Ⅱ型含氟牙釉质粘接剂初始状态释放氟离子水平较高。结论：I型及Ⅱ型含氟牙釉质粘接剂均有释氟性能,而以Ⅱ型含氟牙质粘接剂较佳。     

氟化聚甲基丙烯酸甲酯体外释氟率的测定

目的:通过对含氟聚甲基丙烯酸甲酯体外释氟率的测定,为寻找较为理想的氟含量预防义齿基牙龋提供理论依据。方法:将分别含氟化钙、单氟磷酸钠10%、15%、20%、25%(重量比)5种不同浓度的热凝和自凝树脂各3块,分别于100ml、200ml去离子水中浸泡,定期取液,测量溶液中的氟离子浓度。结果:各浓度的含氟树脂块均能释放氟离子。结论:含单氟磷酸钠15%热凝树脂和10%的自凝树脂是比较好的含氟比例。含氟化钙20%热凝树脂和15%的自凝树脂是比较好的含氟比例。     

六种牙齿充填修复材料的释氟与再充氟性能研究

目的 评价6种牙齿充填修复材料的释氟和再充氟性能,以期为临床选择和应用提供参考.方法 选择材料A(FujiⅦ玻璃离子水门汀)、材料B(FujiⅡLC光固化玻璃离子水门汀)、材料C(Beautifil离子体复合树脂)、材料D(Compoglass F复合体)、材料E(Charisma普通复合树脂)及材料F(实验Ⅰ型释氟性复合树脂)作为实验材料,制备直径10 mm、厚1 mm的圆片,每组10个试样.每个试样浸于5 ml去离子水中,用氟离子选择电极测定浸出液氟离子量,浸泡1～7d每天测定,8～28d3d测定1次,计算每日释氟量.于浸泡28 d后用氟化泡沫对试样充氟4min,继续测定试样每日释氟量,连续测定7d;再充氟并测定氟释放7d,重复3次.结果 浸泡1d后所有材料均表现最大的释氟量,材料A释氟量最大[(99.68±15.21) μg·cm-2·d-1],其次为材料B[(37.12±1.67) μg·cm-2·d-1],再次为材料F和D[分别为(22.93±1.53)和(15.28±0.70) μg·cm-2·d-1],材料C和E释氟量较小[分别为(2.40±0.52)和(0.11±0.02) μg·cm-2· d-1],各组间差异有统计学意义(P＜0.05).浸泡2d后释氟量显著下降,随后(7～ 28 d)释氟量下降缓慢;浸泡1～28 d内,材料A和B的释氟量始终大于其他材料(P＜0.01),其次是材料D和F,显著大于材料C和E(P＜0.01).所有材料充氟1d后的释氟量均较充氟前显著增加,形成释氟高峰,充氟2d后的释氟量又显著下降.充氟1d后材料A的释氟量超过40 μg· cm-2·d-1,大于其他材料(P＜0.01);其次是材料B,释氟量超过25 μg· cm-2·d-1,大于除A外的其他材料(P＜0.01);材料C、D、F释氟量相近,在15～ 20μg·cm-2·d-1之间;材料E释氟量较小,＜1.5 μg· cm-2·d-1.结论 玻璃离子水门汀类材料的释放及再充氟能力最强,其次是复合体和释氟性复合树脂,离子体复合树脂释氟能力小,但其再充氟能力与复合体和释氟性复合树脂相当,普通复合树脂的释氟及再充氟能力均较小.     

3种正畸粘结剂氟缓释的体外研究

目的 通过氟电极测定法测定三种正畸粘结剂的氟释放量。方法 共30份试样分为3组,每组10份。分别把试样充填在一个塑料的环形板上,用探针去尽模板边缘溢出的树脂。待粘结剂完全硬固后,将标本放置10 mL去离子水中。在实验的1、2、3、4、5、6、7、14、21、28、35 d通过氟离子选择电极测试氟离子的释放量。结果 3组材料释放的氟离子量不同,玻璃离子粘结剂（TP Orthodontics,美国）氟释放量最大。复合固化玻璃离子粘结剂（3M,美国）与Rely-a-bond（Reliance Orthodontic,美国）的氟离子释放量没有统计学差异。结论 传统玻璃离子粘结剂、树脂增强型玻璃离子粘结剂、可释放氟树脂粘结剂都可以长期释放氟离子。     

Eighteen‐month clinical evaluation of microhybrid,packable and nanofilled resin composites in Class I restorations

Summary The aim of this article was to report the results of an 18‐month longitudinal randomized clinical trial that evaluated the clinical performance of microhybrid, packable and nanofilled resin composite restorations placed in Class I cavities of molar teeth. Three Class I resin composite restorations were placed in each of 35 patients. Each patient received one microhybrid (‘Point 4’; Kerr, Orange, CA, USA), one packable (‘Packable Premise’; Kerr, Orange, CA, USA) and one nanofilled (‘Nanofilled Premise’; Kerr, Orange, CA, USA) resin composite restoration. Clinical evaluation was performed at baseline (2 weeks after placement), and after 6, 12 and 18 months after placement using modified Ryge criteria. No patients were lost from the study. At the final appointment (after 18 months), 95·4%, 93·7% and 96·2% respectively of the microhybrid (‘Point 4’), packable (‘Packable Premise’ and nanofilled (‘Nanofilled Premise’) resin composite restorations received Alfa ratings. Regardless of the type of restorative material, no significant changes were observed in the modified Ryge criteria at the baseline and 18‐month recalls (P ≤0·05). Three restorations (one from each group) exhibited post‐operative sensitivity at the baseline and 6‐month appointment. After 18 months, one packable resin composite restoration failed because of secondary caries, while secondary caries was not detected on any of the other restorations. The clinical performance of microhybrid (‘Point 4’), packable (‘Packable Premise’) and nanofilled (‘Nanofilled Premise’) resin composite restorations was acceptable after 18 months. Further studies with longer follow‐up periods are recommended to investigate the long‐term survival of these restorations.     

Comparison of translucency between indirect and direct resin composites

OBJECTIVES: To measure the translucency of indirect and direct resin composites after curing, and to determine the influence of material and shade group combination on these properties. METHODS: BelleGlass NG (BG, indirect resin composite) and Estelite Sigma (ES, direct resin composite), each composed in three shade groups (EN, OD and TL for BG; BS, AS and OP for ES) of 16 shades were investigated. Resin composite was packed into a mold (BEC) and was cured with a light-curing unit (CWL). Secondary curing was performed in a proprietary curing chamber (CIC) for BG material. Color was measured at the BEC, CWL and CIC conditions in the CIELAB scale using a spectrophotometer. Translucency parameter (TP) was calculated as the color difference between a specimen over a white and a black background. RESULTS: TP values before curing were in the range of 7.7 (BG-OD) to 16.9 (ES-AS), and those after curing were in the range of 10.0 (BG-OD) to 21.5 (BG-EN). TP values of both materials were influenced by curing (p<0.05). There were significant difference in the TP values by the material and shade group combination, and the following homogenous subsets were found based on Tukey multiple comparison test: BG-OD相似文献   

Grandio纳米树脂与可乐丽树脂充填治疗后牙深龋的疗效比较

目的 对比Grandio纳米树脂与可乐丽树脂充填治疗后牙深龋的临床效果.方法 选择后牙深龋患者276例398颗,随机分为2组.试验组138例197颗患牙使用Grandio纳米树脂充填,对照组138例201颗患牙使用可乐丽树脂充填.术后随访2年,对比两组充填体解剖形态、固位、边缘密合度及牙齿继发龋、牙髓、根尖周及牙周状况.结果 治疗后6个月试验组和对照组成功率分别为97.46％和97.01％,成功率差异无统计学意义(x2=0.074,P=0.786).治疗后2年试验组和对照组成功率分别为95.43％和88.06％,差异有统计学意义(x2 =7.110,P=0.008),其中Ⅰ类洞成功率差异无统计学意义,Ⅱ类洞成功率试验组高于对照组,差异有统计学意义(x2=8.728,P=0.003).结论 Grandio纳米树脂充填治疗后牙深龋Ⅱ类洞远期疗效较佳.     

自酸蚀粘接剂复合树脂修复后牙Ⅰ类洞三年的临床评价

目的评价自酸蚀粘接剂复合树脂修复后牙Ⅰ类洞的临床效果。方法70例中深龋磨牙分为两组,实验组36例采用自酸蚀粘接剂＋混合填料复合树脂修复,对照组34例使用全酸蚀牙本质粘接剂＋可充压复合树脂修复。结果在复查的三年期限内,两组修复体在术后敏感性、修复体表面形态、边缘密合性及继发龋方面均无显著性差异,色彩匹配性在术后一年和二年的统计学结果有显著性差异（P〈0.05）。结论用自酸蚀粘接剂和复合树脂修复后牙Ⅰ类洞可获得同样满意的临床效果,但混合填料复合树脂组色彩稳定性较可充压复合树脂组略差。     

Minimally invasive use of coloured composite resin in aesthetic restoration of periodontially involved teeth: Case report

Gingival recession causes not only aesthetic problems, but problems with oral hygiene, plaque accumulation, speech, and tooth sensitivity. Replacing the missing gingival tissue with composite resin, when indicated, can be a time- and cost-effective solution. Here we report the case of a 25-year-old female who presented with generalized gingival recession. Black triangles were present between the maxillary and mandibular anterior teeth due to loss of interdental tissues, caused by recent periodontal surgery. She also had slightly malposed maxillary anterior teeth. The patient elected to replace gingival tissue with pink composite resin and to alter the midline with composite resin veneers. The first treatment phase involved placement of pink gingival composite to restore the appearance of interdental papilla to her upper (16, 15, 14, 13, 12, 11, 21, 22, 23, and 24) and lower (34, 33, 32, 31, 41, 42, 43, and 44) teeth. Phase two was to place direct composite resin bonded veneers on her upper (16, 15, 14, 13, 12, 11, 21, 22, 23, and 24) teeth to alter the midline and achieve desired colour. The third treatment phase was to level the lower incisal edge shape by enameloplasty (31, 32, 41, and 42) to produce a more youthful and attractive smile. This case report and brief review attempt to describe the clinical obstacles and the current treatment options along with a suggested protocol. Use of contemporary materials such as gingival coloured composite to restore lost gingival tissue and improve aesthetics can be a simple and cost-effective way to manage patients affected by generalized aggressive periodontitis (AgP).     

Differences in color, translucency and fluorescence between flowable and universal resin composites

OBJECTIVES: To evaluate the optical properties such as color, translucency and fluorescence of flowable resin composites, and compare them with the corresponding shade universal resin composites of the same brand. METHODS: Four brands of flowable and universal resin composites of the same shade designation (A2) were investigated. Color of specimens (2mm in thickness) was measured after polymerization on a reflection spectrophotometer over background of white, black and each corresponding composite material itself. Color differences (DeltaE(ab)(*)) between each combination of resin composites were determined. Translucency parameter (TP) and color difference by the fluorescent emission (DeltaE(ab)(*)-FL) of materials were also calculated. Differences in the optical properties of flowable and universal resin composites were analyzed with one-way ANOVA. RESULTS: DeltaE(ab)(*) between the flowable and the corresponding universal resin composites was in the range of 1.0-6.0 DeltaE(ab)(*) units, which was perceptible (DeltaE(ab)(*)>2.6) in three brands. Flowable resin composites revealed lower TP values in two of the four brands. DeltaE(ab)(*) between flowable and the corresponding universal resin composites was influenced by their difference in translucency. All the four universal resin composites and two flowable resin composites showed fluorescent peak, and the range of DeltaE(ab)(*)-FL was 0.3-2.3 DeltaE(ab)(*) units. CONCLUSIONS: Optical properties of flowable and universal resin composites was significantly different (p<0.05); therefore, differences in color, translucency and fluorescence between the flowable and the corresponding universal resin composites should be considered for clinically acceptable color matching.     

两种方法修复老年患者磨牙牙体大面积缺损的对比性研究

目的:研究间接树脂嵌体修复和复合树脂直接充填磨牙大面积牙体缺损在老年患者中的临床疗效.方法:选择184例老年患者,将符合纳入标准的200颗患牙随机分为2组,分别以硬质树脂嵌体及复合树脂充填修复牙体外形.随访3年,参考美国公共健康会(USPHS)标准,对其临床效果进行观察.结果:2种方法在色泽匹配、边缘着色、龈指标、磨损程度及继发龋方面无统计学差异(P＞0.05);在邻接关系、边缘完整性及修复体折裂方面具有统计学意义(P＜0.05).结论:硬树脂嵌体修复比复合树脂充填能更好地恢复老年患者磨牙正常邻接关系,防止食物嵌塞,保持牙周组织健康.     

渗透树脂与前牙美学树脂颜色稳定性的比较研究

目的 通过分析不同树脂材料对饮料色素的着色效果,比较渗透树脂与前牙美学树脂颜色稳定性的差异。方法 选择3种前牙美学树脂（Filtek Z250、Filtek Z350 XT、Beautiful Flow Plus F00）及人工早期龋渗透树脂（Icon）处理样本各20例,不同树脂样本分别分为2组（每组10例）分别置于咖啡溶液及蒸馏水中浸泡1、2、3周。应用Crystaleye分光光度比色仪进行样本颜色分析。结果 人工早期龋渗透树脂处理表面的着色明显高于其他前牙美学树脂（P<0.05）。所有实验树脂及渗透树脂处理表面的着色均随时间延长而增加,但第1周的着色最为显著,明显高于第2周及第3周的着色（P<0.05）。结论 人工早期龋渗透树脂处理表面较前牙美学树脂更易发生颜色改变。     

牙科复合树脂基质的研究新进展

复合树脂在口腔临床的应用越来越广泛,树脂基质作为复合树脂的主体成分,对树脂性能影响很大.目前,一些新型的树脂基质相继开发出来.本文对近年来在这方面的研究作一综述.