快速水式液压热聚合义齿基托材料力学性能的研究

目的：了解快速液压热聚合义齿基托材料的力学性能。方法：采用自行最新研制的新型水式液压自控牙用树脂聚合器、常规水浴法及气压式多功能牙用树脂聚合器3种方法加热固化义齿基托材料，进行挠度、抗弯曲强度、弹性模量、抗冲击强度及硬度的对比分析。结果：快速液压热聚合义齿基托材料的力学性能与水浴法及气压热聚合者相比无显著性差异，同样可以明显缩短热处理时间且全过程自动完成。结论：快速新型液压自控牙用树脂聚合器简化了义齿制作的操作过程，明显缩短了热处理时间，完全可以准确快速制作出理想的义齿。     

快速液压热聚合义齿基托材料的实验研究

目的 了解快速液压热聚合义齿基托材料的力学性能。方法 采用自行研制的新型液压自控牙用树脂聚合器和常规水浴两种方法加热固化义齿基托材料，进行挠度、抗弯曲强度、弹性模量、抗冲击强度及硬度的对比分折。结果 快速液压热聚合义齿基托材料的力学性能与水浴法相比无显著性差异，但可以明显缩短热处理时间且全过程自动完成。结论 快速新型液压自控牙用树脂聚合器简化了义齿制作的操作过程，明显缩短了热处理时间，可以准确快速制作出理想的义齿。     

不同聚合方式的基托体积稳定性的比较实验

通过快速水式液压自控牙用树脂聚合器热压灌注成型的义齿基托材料 ,在物理性能方面与常规水浴法及气压式多功能牙用树脂聚合器法者无显著性差异[1,2 ] 。作为一种新的工艺方法 ,必须考虑其成型后塑料的体积稳定性。本实验采用水式液压自控牙用树脂聚合器快速聚合聚甲基丙烯酸甲     

多用途牙用树脂聚合器及应用

本文介绍“多用途牙用树脂聚合器”的基本结构，使用程序和临床应用。该聚合器可加压０－０．８Ｍｐａ，加温０－１３０℃，自动控制、可快速、高质聚合热凝和自凝聚甲基丙烯酸甲酯、复合树脂和硅橡胶，制作各类修复体。     

快速液压自控牙用树脂聚合器的临床应用研究

目的 :探讨快速液压自控牙用树脂聚合器在义齿制作中的临床应用效果。方法 :采用快速液压自控牙用树脂聚合器和常规水浴法分别制作可摘义齿并对其进行评估 ,同时测量义齿的临床调牙合高度。结果 :通过两种聚合方法固化的义齿在义齿的评估方面和可被临床戴用的数量上无显著性差异 ,两组中在需要调牙合的义齿件数上有显著性差异 ,水式液压组 <常规水浴法组。结论 :快速水式液压自控牙用树脂聚合器简化了义齿制作的操作过程 ,明显缩短了热处理时间 ,不增高咬合高度 ,从而减少了临床调牙合的时间 ,因此可明显缩短临床就诊的时间 ,提高临床工作效率 ,完全可以准确快速制作出理想的义齿     

快速自控热处理塑料制作义齿新工艺—临床应用研究

介绍一种快速自控热处理塑料制作义齿的新工艺，该新工艺系采用高压、高温密闭水浴热聚合器．小件修复体可在石膏模型上直接徐塑热凝塑料成形，不装盒；大基托、全口义齿按常规装盒，不上压榨器，直接置于聚合器中，以０．４～０．６ＭＰａ，１２０℃水浴热处理５～１０ｍｉｎ，可使热塑性塑料完全聚合，材料性能达到质量要求。该聚合器还可用于处理热固化复合树脂或自凝塑料，热处理过程自动控制，节能，无蒸气污染。     

快速高压热聚合基托树脂的气泡和表面硬度的观察

本文介绍了在自制快速高压树脂热聚合器内,在0.6Mpa的气压下,水温快速升至 120℃,并保持此气压和温度 10min聚合甲基丙烯酸甲酯树脂试件,测试了测件的表面硬度和气泡。共同常规聚合方法聚合的试件进行了比较,未发现显著差异,经统计分析P>0.05。     

快速高压热聚合基托树脂色稳定性的测试

本文采用色彩分光光度测试了在加压快速树脂热聚合器内，０．６ＭＰａ／ｃｍ＾２的压力下１２０℃水中８ｍｉｎ聚合聚甲基丙烯酸甲酯基托树脂试件的色稳定性，，并用常规聚合基托树脂试件进行了比较。     

应用多用途牙用树脂聚合器临床体会

我科应用快速自控热处理塑料聚合器,对180件义齿进行塑料快速自控热处理,并对包埋脱蜡等方面作了改进,取得满意效果,现报道如下:1 材料与方法1.1 材料 多用途牙用树脂聚合器(第四军医大学口腔医学院研制),牙托粉与单体(上海齿科材料厂)。气压为中心供气。1.2 方法1.2.1 基牙预备、取模、取颌位关系、排牙制作要求同常规。牙排好后在蜡基托后缘左右两侧制一直径0.8～1.0cm、长3～5cm的蜡条与蜡基托相连,而后用喷灯喷光。1.2.2 包埋脱蜡,我们采用了分开式和封闭式     

纤维强化硬质树脂粘结桥修复前牙缺失的临床应用

目的：评价纤维加强的硬质树脂粘结桥修复前牙缺失的临床效果。方法：收集我院口腔科门诊31例单个前牙缺失患者,其中25例无需磨牙或磨切少量牙,6例磨切约0.8mm牙体组织,以达到需要的咬合间隙,对31例单个前牙缺失病例,采用玻璃纤维作支架加强的dialogR硬质树脂粘结桥进行修复。结果：经12-50个月的临床随访观察,27例复诊的病人粘结桥修复体无松动、无脱粘、折裂和过度磨耗,无继发龋,修复体边缘无明显染色,粘结界面良好,色泽稳定,美观效果好。结论：纤维强化硬质树脂粘结桥间接修复体具有良好的抗磨性能,机械强度高,色泽稳定,对基牙损伤小,无金属,就诊次数少,椅旁操作时间短,坚固,美观,是一种单个前牙缺失希望固定修复又要求少磨牙患者的首选治疗方法。     

Sealing performance of resin cements before and after thermal cycling: Evaluation by optical coherence tomography

Objectives

Self-adhesive resin cements have been recently introduced; however, there is little data available on their long-term performance. In this in vitro study, swept-source optical coherence tomography (OCT) at 1310 nm center wavelength was used for monitoring adaptation of indirect resin restorations after thermal cycling.

Methods

Resin inlays were luted to class-I cavities of extracted human teeth using three resin cements; Clearfil SA Luting (SA; Kuraray), Bistite II DC or Multibond II (Tokuyama Dental). Each cement was applied with or without pre-coating of dentin by a self-etch adhesive (Clearfil SE Bond) and a low-viscosity microfilled resin. OCT imaging was performed after 24 h, after 2000 and after 10,000 thermocycles (n = 5). Selected samples were sectioned for interfacial observation by confocal laser scanning microscope (CLSM). Floor adaptation (percentage) was analyzed by software on 20 B-scans throughout each specimen, and subjected to statistical analysis by three-way ANOVA test at a significance level of 0.05.

Results

Resin cement type, resin coating and thermal aging all significantly affected adaptation (p < 0.05). Initially, SA showed the highest adaptation; however, thermal aging significantly affected its sealing. The best results for all the cements were consistently achieved when the resin coating technique was applied where no deterioration of interfacial integrity was observed in the coated groups. CLSM closely confirmed OCT findings in all groups.

Significance

OCT could be used for monitoring of composite inlays with several interfacial resin layers. The application of a direct bonding agent in the resin-coating technique improved interfacial sealing and durability of all resin cements.     

复合树脂用丙烯酸液晶单体的合成与表征

目的:合成一种新型的树脂基质主单体——丙烯酸液晶单体(ALCRM),即4-(3-丙烯酰氧基-2-羟基丙氧基)苯甲酸4'-(3-丙烯酰氧基-2-羟基丙氧基)苯甲酯.方法:本实验采用三步法,第一步:对苯二酚与对羟基苯甲酸合成介晶基元-HPHB；第二步:合成环氧化合物EPEB；第三步:合成终产物ALCRM.通过示差扫描量热法(DSC),偏光显微镜(POM),核磁共振(HNMR)3种方法检测合成过程中间产物及终产物的液晶性能以及终产物的介晶域.结果:HNMR检测证实HPHB、EPEB、ALCRM为目标产物.经POM,DSC检测ALCRM具有液晶性能,介晶范围是18 ～42℃.结论:本研究合成含短的柔性间隔链的ALCRM单体,降低了液晶单体的相转化温度,更适用于口腔临床的操作.     

钛烤塑冠修复牙体缺损的临床评价

目的:评价钛烤塑冠修复牙体缺损的临床应用效果。方法:对79例牙体缺损患牙进行修复治疗后,随访1年,对比研究42个钛烤塑冠(实验组)和37个钛烤瓷冠(对照组)的牙龈刺激征、边缘密合性、颜色变化、罩面折裂、颈缘着色等指标。结果:42个钛烤塑冠中,牙龈刺激征3例,边缘不密合1例,颜色变化1例,罩面折裂2例,颈缘着色1例;实验组38例钛烤塑修复患者中,35例患者对钛烤塑冠修复效果满意,满意率92.1%。与钛烤瓷对照组相比无显著性差异(P>0.05)。结论:钛烤塑冠是一种较理想的修复体,极佳的生物相容性和适宜的耐磨性对维护口腔组织的健康具有重要意义,对牙体缺损的修复可获得良好的效果。     

树脂基托表面低温等离子体处理研究

目的评估等离子体用以处理树脂表面减小接触角提高材料润湿性的作用.方法将树脂材料制成10mm×10mm×2mm的试件,置入等离子体处理装置中,先氩气处理10min再氧气处理10min,并对标本进行接触角测量和扫描电镜观察.结果经等离子体处理后,树脂材料接触角明显下降,其表面细微结构无明显变化.结论低温等离子体表面处理技术可用于提高树脂材料表面润湿性.     

不同树脂牙硬度的测试比较

目的通过比较不同树脂牙的硬度值,探讨影响树脂牙硬度的有关因素,为临床医生选择人工牙提供一定的理论依据.方法选择七种不同树脂牙,它们分别为硬质复色合成树脂牙(A)、复色合成树脂牙(B)、合成树脂牙(C)、ENDURA塑钢牙(D)、三层色合成树脂牙(E)、Optostar四层色合成树脂牙(F)、CosmoHXL(G),采用努氏硬度法测试其显微硬度,比较不同树脂牙的硬度值.结果七种树脂牙的努氏硬度大小:A为29.87±0.473HK;B为22.63±0.702HK;C为17.43±0.669;D为41.24±1.708HK;E为23.76±1.143;F为23.02±1.441;G为29.05±1.011,除B和F,E和F之间的差异无统计学意义(P＞0.05)外,其他各组之间的差异均有显著的统计学意义(P＜0.01).结论不同树脂牙努氏硬度值由高到底的顺序是:D＞A＞G＞E＞F＞B＞C,树脂的不同组成成分、分子量大小、聚合方式和加工工艺会影响其机械性能.     

Incorporation of Apigenin and tt-Farnesol into dental composites to modulate the Streptococcus mutans virulence

ObjectivesThe aim of this in vitro study was to incorporate two anti-caries agents, Apigenin and tt-Farnesol, to resin composite and resin cement to reduce the virulence of Streptococcus mutans around dental restorations.MethodsApigenin (Api, 5 mM) and tt-Farnesol (Far, 5 mM) were added alone, together, and combined with fluoride (F). Biofilm of S. mutans was grown on composite discs, and the dry-weight, bacterial viability, and the polysaccharides (alkali-soluble, intracellular and water-soluble) were quantified. CLSM images of the S. mutans biofilm were obtained after three years of water-storage. The effect of the additions on the physicochemical properties and the composite colorimetric parameters were also analyzed.ResultsThe additions did not affect bacterial viability. Api alone and combined with Far or combined with Far and F decreased the bacterial dry-weight, alkali-soluble and intracellular polysaccharides. After three years, the composites containing the additions presented a greater EPS matrix on the top of biofilm. Statistical difference was obtained for the degree of conversion; however, the maximum polymerization rate and curing kinetics were unaffected by the additions. No difference was observed for the water-soluble polysaccharides, flexural strength, and elastic modulus. Api increased the yellowness of the composites.SignificanceApi, alone and combined, reduced the expression of virulence of S. mutans without jeopardizing the physicochemical properties of the composites.     

A critical analysis of the degree of conversion of resin-based luting cements

Objective

This study analyzed the degree of conversion (DC%) of four resin-based cements (All Ceram, Enforce, Rely X ARC and Variolink II) activated by two modes (chemical and dual), and evaluated the decrease of DC% in the dual mode promoted by the interposition of a 2.0-mm-thick IPS Empress 2 disc.

Material and Methods

In the chemical activation, the resin-based cements were prepared by mixing equal amounts of base and catalyst pastes. In the dual activation, after mixing, the cements were light-activated at 650 mW/cm² for 40 s. In a third group, the cements were lightactivated through a 2.0-mm-thick IPS Empress 2 disc. The DC% was evaluated in a FT-IR spectrometer equipped with an attenuated total reflectance crystal (ATR). The data were analyzed by two-way ANOVA and Tukey''s HSD test.

Results

For all resin-based cements, the DC% was significantly higher with dual activation, followed by dual activation through IPS Empress 2, and chemical activation (p<0.05). Irrespective of the activation mode, Rely X presented the highest DC% (p<0.05). Chemically activated Variolink and All Ceram showed the worst results (p<0.05). The DC% decreased significantly when activation was performed through a 2.0-mm-thick IPS Empress 2 disc (p<0.05).

Conclusions

The results of the present study suggest that resin-based cements could present low DC% when the materials are dually activated through 2.0 mm of reinforced ceramic materials with translucency equal to or less than that of IPS-Empress 2.     

铸瓷贴面厚度对修复体颜色匹配性的影响

目的:分析瓷材料厚度变化对瓷贴面修复体颜色匹配性的影响。方法:选用36颗树脂人工牙按临床要求进行贴面牙体预备。制作二硅酸锂热压铸陶瓷贴面(HT和LT瓷块),按修复体中1/3的厚度分为0.50 mm、0.75 mm和1.00 mm组(n=6)。使用树脂粘接剂将瓷贴面粘接于预备后的树脂人工牙上。比色仪测量瓷贴面试样颈部、中部和切端区域的色度参数。计算瓷贴面试样与A2色标(Vita Classical比色板)的色差值△E。结果:3种厚度瓷贴面修复体与A2色标的色差值范围2.17~6.60,其中0.75 mm和1.0 mm组HT瓷贴面试样在颈部和中部与A2色标的色差值小于3.3。双因素方差分析表明瓷材料厚度和测色部位显著影响瓷贴面试样与A2色标的色差值(P< 0.001)。结论:瓷材料厚度变化影响瓷贴面修复体的颜色参数。随瓷材料厚度增加,LT瓷贴面亮度降低色彩饱和度增加,而HT瓷贴面亮度增加色彩饱和度降低。     

树脂牙和成品塑料牙制作暂时冠的有关问题及比较分析

目的：采用SWIFT-TEMP树脂和成品塑料牙,制作暂时冠的一些体会以用有关问题进行比较分析。方法：收集368例患者进行树脂牙和成品塑料牙的制作来比较和分析。结果：SWIFT-TEMP树脂牙对牙髓无刺激,边缘密合性好,美观舒适。塑料牙快速简便,但只适用前牙和单个后牙临时修复,且产生的热量会化学刺激损伤牙髓。结论：SWIFT-TEMP树脂牙制作的暂时冠较成品塑料牙制作的暂时冠在性能上能使暂时冠桥的作用得到更好的发挥。