Push-out Bond Strength of Self-adhesive Methacrylate Resin-based Sealers to Root Dentin

This study examined the adhesive strength of two self-adhesive methacrylate resin-based sealers（MetaSEAL and RealSeal SE） to root dentin and compared them with RealSeal and AH Plus in properties. A total of 48 extracted human single-rooted teeth were used to prepare the 0.9-mm thick longitudinal tooth slice（each per tooth）. Standardized simulated canal spaces of uniform dimensions were prepared in the middle of radicular dentin. After treated with 5.25% sodium hypochlorite（NaOCl） and 17% EDTA, tooth slices were allocated randomly to four groups（n=12） in terms of different sealers used： MetaSEAL, RealSeal SE, RealSeal, and AH plus groups. The simulated canal spaces were obturated with different sealers in each group. There were 10 slabs with 20 simulated canal spaces（n=20） used in each group for push-out testing. The failure modes and the ultrastructures of fractured sealer-dentin interfaces were examined. The remaining 2 slabs in each group underwent partial demineralization for observation of the ultrastructure of resin tags. The results showed that the push-out bond strength was 12.01±4.66 MPa in MetaSEAL group, significantly higher than that in the other three groups（P0.05）. Moreover, no statistically significant differences were noted in the push-out bond strength between RealSeal SE（5.43±3.68 MPa） and AH Plus（7.34±2.83 MPa） groups and between RealSeal SE and RealSeal（2.93±1.76 MPa） groups（P0.05）. Mixed failures were predominant in the fractured sealer-dentin interfaces in MetaSEAL and AH Plus groups, while adhesive failures were frequently seen in RealSeal SE and RealSeal groups. In conclusion, after complete removal of the smear layer, MetaSEAL showed superior bond ability to root dentin. The RealSeal SE is applicable in clinical practice, with its adhesive strength similar to that of AH Plus. The self-adhesive methacrylate resin-based sealer holds promise for use in endodontic treatment.

Effect of Self-adhesive Resin Cement and Tribochemical Treatment on Bond Strength to Zirconia

Aim To evaluate the interactive effects of different self- adhesive resin cements and tribochemical treatment on bond strength to zirconia. Methodology The following self-adhesive resin cements for bonding two zirconia blocks were evaluated： Maxcem （MA）, Smartcem （SM）, Rely X Unicem Aplicap （UN）, Breeze （BR）, Biscem （BI）, Set （SE）, and Clearfil SA luting （CL）. The specimens were grouped according to conditioning as follows： Group 1, polishing with 600 grit polishing paper; Group 2, silica coating with 110 μm Al2O3 particles which modified with silica; and, Group 3, tribochemical treatment - silica coating ＋ silanization. Specimens were stored in distilled water at 37℃ for 24 hours before testing shear bond strength. Results Silica coating and tribochemical treatment significantly increased the bond strength of the MA, UN, BR, B1, SE and CL to zirconia compared to #600 polishing. For both #600 polished and silica coating treatments, MDP- containing self-adhesive resin cement CL had the highest bond strengths to zirconia. Conclusion Applying silica coating and tribochemical treatment improved the bond strength of self-adhesive resin cement to zirconia, especially for CL.

Influence of Phosphoric Acid Etching on the Bond Strength of a Universal Adhesive System to Caries-Affected Dentin

The purpose of this study was to evaluate the influence of acid etching on the bond strength of a universal adhesive system (Single Bond Universal, 3M) to caries-affected dentin. Forty permanent third molars were selected and carious lesions were induced by the microbiological method with?S. mutans?ATCC25175. Teeth were allocated randomly across four experimental designs (n?=?10): PA-I: phosphoric acid etching and application of the adhesive system, followed by immediate microtensile bond strength testing;PA-CC: phosphoric acid etching and application of the adhesive system, followed by microtensile bond strength testing after a 14-day cariogenic challenge;NPA-I: application of the adhesive system without acid etching, followed by immediate bond strength testing and NPA-CC: application of the adhesive system without acid etching followed by bond strength testing after 14-day cariogenic challenge. For microtensile bond strength testing,?a restoration with Charisma composite resin was made and each specimen was sectioned with a cross-sectional area of 1 mm2. Only adhesive and mixed fractures were considered for bond strength calculation. Results were evaluated by the Kruskal-Wallis and Friedman tests. The highest bond strengths were observed in the phosphoric acid etching groups (p??0.05). Cariogenic challenge did not affect bond strength (p?>?0.05). The predominant fracture type was adhesive. We conclude that phosphoric acid increased the bond strength of the Single Bond Universal system to caries-affected dentin, and that cariogenic challenge did not interfere with this bond strength.

Isotropic shear bond strength behavior of superficial bovine dentin: A pilot study

The aim of this pilot study was to evaluate the shear bond strength of superficial bovine incisor dentin in different crown regions. Bonding was performed to the incisal, middle and cervical thirds of superficial bovine coronal dentin (n = 20) with a two-step etch-and-rinse adhesive (Optibond Solo Plus) and resin composite (Z100). Shear bond strength was evaluated at 24 h and failure modes of representative specimens wereobserved with FE-SEM. Non-parametric Kruskal-Wallis test with a significance level of 0.05 was used for data analysis. Mean shear bond strength values for the incisal, middle, and cervical thirds were 36.9 (3.1), 42.6 (2.6), and 37.1 (2.1) respectively with no significant differences evidenced between the crown thirds (p = 0.19). Observation of the failure mode of representative specimens demonstrated that specimens with high bond strength values exhibited predominantly mixed-type failures whereas low strength specimens exhibited adhesive failures between the dentin and adhesive. The absence of significant differences in shear bond strength between crown thirds indicate that, regardless of tubule orientation, any crown region can be used when superficial bovine incisor dentin is used for shear bond strength testing.

Evaluation of an Orthodontic Adhesive with Combined Primer and Composite

Objectives: To investigate the efficacy of a new orthodontic bonding system that incorporates the primer solution in the adhesive. Materials and Methods: 90 anterior bovine teeth were divided in three groups: in Group I, brackets were bonded with Transbond XT system, in Group II with GC Ortho Connect which incorporates the primer in the adhesive, and in Group III, a single layer of primer was applied on the teeth before bonding the brackets with GC Ortho Connect. After a 24-hour latency period, Shear Bond Strength (SBS) and Adhesive Remnant Index (ARI) were measured. In cases with remnants left mainly on the bracket base, energy dispersive X-ray (EDX) spectrometry was performed in order to determine the presence of calcium particles. Selected cases were examined with Scanning Electron Microscopy (SEM) analysis and in nanometer scale with a confocal visible light microscope (μsurf revolver, NanoFocus AG, Germany). Results: The mean SBS values were 7.25 ± 0.58 MPa for Group I, 6.57 ± 0.50 MPa for Group II and 7.33 ± 0.56 MPa for Group III. These differences were not statistically significant (p = 0.562). ARI evaluation showed that the debonding failure happened more frequently within the adhesive interface in Group II, whereas this occurred more often at the tooth-adhesive interface in Group III. However, statistical analysis of the ARI scores showed no significant difference in adhesive remnants among the three groups (p = 0.078). Conclusion: The GC Ortho Connect bonding system can be efficiently used for orthodontic bonding. Adding a layer of primer appears to slightly increase the SBS while causing less adhesive to remain on enamel from which brackets were debonded.

Surface preparation and isotropic shear bond strength properties of superficial bovine dentin

The effect of different types of surface preparation with SiC abrasive paper on the shear bond strength (SBS) of superficial bovine dentin obtained from the incisal, middle and cervical thirds were evaluated. Dentin substrates were obtained with twenty specimens for each locationgrit combination. Superficial dentin was exposed and prepared to 120-, 320-, or 600-grit SiC;the dentin surfaces were treated with Optibond Solo Plus (Kerr) and polymerized for 20 s. The specimens were placed in a jig, filled with resin composite Z100 (3M-ESPE), polymerized for 40 s according to manufacturer’s instructions, and stored for 24 h at 37℃ and 100% humidity. After 24 h, SBS was measured using a loading testing machine (Ul-tradent) and expressed in megapascals. A two-way ANOVA and Tukey test were used for data analysis. No statistically significant effect of the location (P = 0.254) or interaction grit-location (P = 0.629) were observed on SBS. Statistically significant effect of the grit on the SBS was detected (P < 0.001) with 320-grit being statistically different from 600-grit (P = 0.011) and 120-grit (P < 0.001). No significant differences were observed between 600-grit and 120-grit (P = 0.413). Regardless of the location, 320-grit consistently showed the lowest SBS indicating that different surface grit preparations have an effect on dentin SBS values.

Effect of hot-humid exposure on static strength of adhesive-bonded aluminum alloys

The effect of hot-humid exposure(i.e., 40 C and 98% R.H.) on the quasi-static strength of the adhesive-bonded aluminum alloys was studied. Test results show that the hot-humid exposure leads to the significant decrease in the joint strength and the change of the failure mode from a mixed cohesive and adhesive failure with cohesive failure being dominant to adhesive failure being dominant. Careful analyses of the results reveal that the physical bond is likely responsible for the bond adhesion between L adhesive and aluminum substrates. The reduction in joint strength and the change of the failure mode resulted from the degradation in bond adhesion, which was primarily attributed to the corrosion of aluminum substrate. In addition, the elevated temperature exposure significantly accelerated the corrosion reaction of aluminum, which accelerated the degradation in joint strength.

Bond Strength of Orthodontic Bracket Cement Using a Bleaching Light for Curing

Aim: To investigate the bond strengths achieved by using a Bleaching Curing Light (BCL) to polymerize orthodontic bonding cement. Material and Methods: 160 anterior bovine teeth were used to form 20 average sized human dental arches, and distributed into 2 groups according to which light curing method used: Group 1: BCL for 40 seconds, or Group 2: LED for 10 seconds. After storage in a controlled environment, Shear Bond Strength (SBS) and Adhesive Remnant Index (ARI) were determined. Results: Group 1 showed significantly lower SBS in the most posterior (first molar) position of the dental arch, (Group 1: 0.7 ± 1.0 MPa, Group 2: 2.9 ± 1.7 MPa, p Conclusion: Simultaneous full-arch curing of orthodontic bracket cement using a BCL is clinically acceptable in all but the most posterior locations along the dental arch.

An in Vitro Comparison of Bonding Effectiveness of Different Adhesive Strategies on Erbium:Yttrium-Alluminum-Garnet Laser Irradiated Dentin

Background: To date there is not a material considered ideal for the lased dentin. Objective: To compare the bond strength to human lased dentin of self-etch and etch-and-rinse adhesive systems, a self-adhesive resin composite and a glass-ionomer cement. Methods: Forty human molars were sectioned to obtain a 2 mm-thick slab of mid-coronal dentin. The occlusal surface of each slab was polished by SiC paper (P600) for 10 s. Then an half part of dentin slabs was randomly selected for receiving treatment with 2.94 μm Er:YAG laser (DEKA, Smart 2940D Plus) with 10 Hz at 100 mJ, pulse duration of 230 μs with contact tip. Dentin slabs were randomly divided into four groups (n = 10). Six conical frustum-shaped build-ups were constructed on the occlusal surface of each dentin slab using bonding agents (OptiBond Solo Plus Group 1;OptiBond All-in-one Group 2) combined with a resin composite (Premise Flow), self-adhesive resin composites (Vertise Flow Group 3) and a glass-ionomer cement (Ketac-Fil Group 4). Specimens were subjected to μSBS test. Data were analyzed by a mixed model and Tukey’s test. Results: Measured bond strengths were (mean ± standard deviation): 20.8 ± 5.5 MPa (laser treatment) and 15.6 ± 4.5 MPa (SiC paper) for Group 1, 18.9 ± 5.3 MPa (laser treatment) and 14.0 ± 4.3 MPa (SiC paper) for Group 2, 7.9 ± 2.8 MPa (laser treatment) and 4.3 ± 2.2 MPa (SiC paper) for Group 3, 4.7 ± 1.9 MPa (laser treatment) and 2.6 ± 1.2 MPa (SiC paper) for Group 4. The inferential analysis showed that the dentin laser treatment significantly affected the bond strength within each individual group. On dentin treated with laser the bond strengths recorded for build-ups constructed with etch and rinse and self-etch adhesive systems were significantly higher than those recorded for build-ups constructed with self-adhesive resin composite and glass-ionomer cement (p < 0.0001). Similarly, on dentin treated with SiC paper the bond strengths recorded for build-ups constructed with etch and rinse and self-etch adhesive systems were significantly higher than those recorded for build-ups constructed with self-adhesive resin composite and glass-ionomer cement (p < 0.0001). Conclusion: Er:YAG laser treatment has increased the shear bond strength of all the adhesive materials used.

Damage Failure Analysis of Z-Pins Reinforced Composite Adhesively Bonded Single-Lap Joint

In order to study themechanical properties of Z-pins reinforced laminated composite single-lap adhesively bonded joint under un-directional static tensile load,damage failure analysis of the joint was carried out bymeans of test and numerical simulation.The failure mode and mechanism of the joint were analyzed by tensile failure experiments.According to the experimental results,the joint exhibits mixed failure,and the ultimate failure is Z-pins pulling out of the adherend.In order to study the failure mechanism of the joint,the finite element method is used to predict the failure strength.The numerical results are in good agreement with the experimental results,and the error is 6.0%,which proves the validity of the numerical model.Through progressive damage failure analysis,it is found that matrix tensile failure of laminate at the edge of Z-pins occurs first,then adhesive layer failure-proceeds at the edge of Z-pins,and finally matrix-fiber shear failure of the laminate takes place.With the increase of load,the matrix-fiber shear failure expands gradually in the X direction,and at the same time,the matrix tensile failure at the hole edge gradually extends in different directions,which is consistent with the experimental results.

Multiple Coatings can Improve the Bond Durability of One-step Self-etching Adhesive to Primary Dentin

Objective To investigate whether multiple coatings can improve the bond durability of one-step self-etching adhesive to primary dentin.Methods Twelve caries-free human primary molars were randomly divided into 2 groups.In group 1,each tooth was hemisected into 2 halves.One half was assigned to the control subgroup 1,which was bonded with a commercially available one-step self-etching adhesive according to the manufacturer's instructions;the other half was assigned to experimental subgroup 1,in which the adhesive was applied three times before light curing.In group 2,one split half tooth was bonded with a commercially available one-step self-etching adhesive according to the manufacturer's instructions;for the other half,three layers of adhesive were applied with each successive layer of light curing.Specimens were stored in 0.9% NaCl containing 0.02% sodium azide at 37℃ for 18 months and then were subjected to microtensile bond strength test and the fracture mode analysis.Results When the adhesive was applied three times before light curing,the bond strength of the experimental subgroup 1 was significantly higher than that of the control subgroup 1(47.46±13.91 vs.38.12±11.21 MPa,P<0.05).When using the technique of applying multiple layers of adhesive with each successive layer of light curing,no difference was observed in bond strength between the control subgroup and the experimental subgroup(39.40±8.87 vs.40.87±9.33 MPa,P>0.05).Conclusion Multiple coatings can improve the bond durability of one-step self-etching adhesive to primary dentin when using the technique of light-curing after applying 3 layers of adhesive.

无机填料改性小麦蛋白/单宁复合胶粘剂的制备及性能研究

以小麦蛋白(WG)和缩合单宁(CTs)为原料,制备了无甲醛的生物基木材胶粘剂。利用蒙脱土、高岭土、重质碳酸钙、轻质碳酸钙和羟基磷灰石为填料进行改性,采用共混的方式制备填料改性复合胶粘剂。考察了无机填料种类对WG/CTs复合胶粘剂性能的影响,并进行耐水胶合强度、扫描电子显微镜(SEM)、热重分析仪、沸水煮不溶率、黏度等测试分析。研究结果表明:加入填料后,WG/CTs复合胶粘剂的黏度均有不同程度的增大,胶粘剂的热稳定性也比对照组胶粘剂有所提高;不同无机填料改性胶粘剂的耐水性存在显著差异,但胶合板的湿态强度均超过0.7 MPa,达到国家II类胶合板标准的要求;沸水煮不溶率测试结果显示,轻质碳酸钙改善了胶粘剂的耐水性;SEM图和胶层裂纹评估显示,重质碳酸钙、轻质碳酸钙与胶粘剂具有良好的相容性,表明碳酸钙填料对胶层的韧性没有影响,是较好的填料选择。

尿素-乙二醛树脂改性大豆蛋白胶黏剂的制备及性能研究

以尿素-乙二醛(UG)树脂和大豆分离蛋白(SPI)为主要原料制备大豆蛋白胶(SUG),并对其固体含量、黏度、表面张力系数、接触角及胶合性能进行测试;利用XPS、FT-IR和^(13)C NMR对合成的SUG的结构进行表征;采用DSC及DMA对SUG的固化性能进行测定。研究结果表明:改性后大豆蛋白胶的固体含量、黏度、表面张力系数及接触角随着SPI添加量的增加而增大,其中黏度的变化最显著;合成大豆蛋白胶中主要含有C—C、C—O—C、C=O、C=N、C=O等官能团;结合^(13)C NMR及FT-IR分析结果,可以得出UG树脂与SPI二者之间产生了交联;当SPI用量为30 g,UG树脂用量为50 g时,制备的大豆蛋白基胶黏剂性能较佳且固化后储能模量较大,为4082 MPa,在160和180℃热压温度下制备的胶合板冷水24 h湿强度分别为1.23和1.48 MPa,热水3 h湿强度分别为1.05和1.22 MPa,远大于国家标准GB/T 9846—2015对II类胶合板的要求,且具备一定的耐沸水性能。

聚乙烯醇水基胶对卷烟中空滤棒的粘接强度影响因素研究

为了提高卷烟滤棒生产过程中成型纸与滤棒中空丝束段间的中线胶粘接效果,从性能、施胶方式等全过程各因素探究特定烟用水基胶对上机适用性的影响规律,通过流变研究了不同规格水基胶的流变特性,分析了水基胶膜的热性能和力学性能,进一步评价各水基胶的干燥速度和润湿性能,对水基胶的粘接强度进行测试,推测了最终粘接强度的影响因素。结果表明,在固含量相近的条件下,各水基胶均表现出良好的抗剪切能力,黏度较高的水基胶具有更高的强度和韧性,制备得到的胶膜也具有更高的强度;但水基胶过高的黏度会降低其干燥速度和对滤棒的润湿性,进而影响水基胶的粘接。因此,黏度适中的水基胶具有最好的粘接效果。

诺丽对冠部牙本质粘接强度及纳米渗漏的影响

目的探讨诺丽(Morinda citrifolia juice,MCJ)联合乙二胺四乙酸盐(ethylene diaminete traacetic acid,EDTA)根管冲洗对冠部牙本质粘接强度及纳米渗漏的影响,并与临床上最常用的根管冲洗液次氯酸钠(sodi⁃um hypochlorite,NaClO)相比较,为临床应用提供参考。方法本研究已通过单位伦理审查委员会批准。选取63颗因正畸拔除的人前磨牙,去除表面釉质暴露牙本质平面后,根据冲洗液不同随机分为对照组(蒸馏水组)和6个实验组,即:A组2.5%NaClO、B组5.25%NaClO、C组6%MCJ、D组2.5%NaClO⁃17%EDTA、E组5.25%NaClO⁃17%EDTA和F组6%MCJ⁃17%EDTA(n=9),分别用相应冲洗液浸泡20 min后,在其表面分层堆积4 mm×4 mm×3 mm的Z350树脂块,每组选取6个样本,低速切割机将每个样本切割成1 mm×1 mm×8 mm的试件条,进行微拉伸粘接强度测试,随后在体视显微镜下观察断裂类型;每组剩余的3个样本经老化后切割成1 mm厚的薄片,进行界面纳米渗漏测试以及扫描电子显微镜下观察树脂⁃牙本质粘接界面。结果各组微拉伸粘接强度测试值均有显著性差异(P<0.05),对照组粘接强度最高。实验组中,B组粘接强度最低,以粘接界面破坏为主;F组粘接强度最高,以混合破坏为主。各组纳米渗漏值均有显著性差异(P<0.05),对照组纳米渗漏值最低。实验组中,B组纳米渗漏值最高、树脂突较细,F组纳米渗漏值最低、树脂突粗大且密集。结论NaClO浓度越高,冠部牙本质的粘接强度及边缘封闭性越差;MCJ联合EDTA根管冲洗对冠部牙本质的粘接强度和边缘封闭性的影响小于NaClO联合EDTA根管冲洗。

基于激光表面微纳结构的胶接性能研究进展

胶接具有独特的性能而被广泛关注,但在实际应用中往往由于界面结合强度不足而导致接头在服役过程中过早失效。激光表面处理是一种能够有效提高胶接接头表面性能的方法,通过激光表面处理会使黏接材料表面形成不同的表面微纳结构,从而改善接头的性能。首先介绍了激光表面处理原理及激光器分类,对比了不同激光器的优缺点及加工质量特性,分析了激光加工参数对接头强度的影响。其次从激光加工不同表面微纳结构入手,阐述了不同表面微纳结构的加工方式,分析了不同表面微纳结构对不同材料接头强度的影响。此外,针对不同的表面微纳结构,其结构参数有所不同,导致接头表面化学成分和润湿性能也有所不同,使得接头强度有所差异,在此基础上分析了微纳结构参数对接头强度的影响及原因。同时,胶层间的作用机制与接头强度具有密不可分的联系,研究表明,不同的表面微纳结构对胶层的作用机制具有明显的不同,归纳总结发现,经激光表面处理形成表面微纳结构后接头表面粗糙度、化学性质、润湿性能及胶层间裂纹的扩展对接头强度的提升具有一定作用。最后,对激光表面处理微纳结构的研究进行了展望。

乙烯基三乙氧基硅烷(VTES)改性APAO-V基热熔胶及其性能研究

使用乙烯基三乙氧基硅烷(VTES)对聚α-烯烃(APAO)基热熔胶进行接枝改性,制备了高粘接强度、耐溶剂性、耐热性稳定的反应型聚α-烯烃-乙烯基三乙氧基硅烷(APAO-V)基热熔胶。探究了不同质量分数下VTES改性APAO后对所制备热熔胶体系各性能的影响,从而确定最佳配比。研究结果表明:(1)FT-IR曲线表明VTES发生水解进行自交联,VTES改性APAO成功;XRD衍射曲线表明VTES接枝APAO并未对其结晶形态产生影响。(2)当VTES的质量分数为8%时,VTES改性APAO基热熔胶的软化点、旋转黏度均达到最大值,分别为147.7℃、7025 mPa·s,APAO基热熔胶热稳定性能最好。(3)使用8%VTES改性APAO所制备的反应型APAO-V基热熔胶,改性后热熔胶的粘接强度在常温、高温(60℃)以及低温(-20℃)状态下均有提升,其中常温下粘接提升效果最好,剥离强度提升了15.0 N/cm。改性后热熔胶在浸水28 d后剥离强度仍能达到22.3 N/cm。(4)使用8%VTES改性APAO所制备的反应型APAO-V基热熔胶,比较热熔胶对4种不同塑料基材(PE、PVC、PP和ABS)的单搭接剪切强度,改性后APAO所制备的热熔胶的粘接性能均有很大程度的提升。

一种乐器修补用的胶粘剂及粘接修补效果研究

针对胶粘剂对乐器用木材力学和声学性能的影响,试验制备了一种聚氨酯胶粘剂,并对其力学性能和声学性能进行探讨。试验结果表明,最佳R值为9.5,此时,材料的热稳定性良好,润湿性较好,粘接强度为17.35 MPa;材料粘接强度随催化剂含量的增加先上升后下降,催化剂最佳含量为0.25%,此时粘接强度为20.06 MPa;偶联剂最佳含量为0.15%;经胶粘剂处理后的桦木试件比动态弹性模量为20.22 GPa,声阻抗为2.83(Pa·s)/m,声学性能良好。试验制备的聚氨酯胶粘剂具备较好的热稳定性、润湿性、粘接强度,对乐器木材的修补效果较好,能作为一种乐器修补用胶粘剂使用。

Quartz splint^(TM)高强度石英纤维和Super-Bond C&B粘结剂固定下前牙松动牙疗效比较

目的:比较Quartz splint^(TM)高强度石英纤维和Super-Bond C&B粘结剂固定慢性牙周炎下前牙松动牙的临床效果。方法:选取下前牙松动需要做牙周夹板松牙固定患者40例,随机分为两组。A组:在洁治、刮治和根面平整后,使用Quartz splint^(TM)高强度石英纤维做牙周固定;B组:在在洁治、刮治和根面平整后,使用Super-Bond C&B粘结剂做牙周固定。两组固定后即刻让患者对于固定物做出异物感评价。固定6个月后比较治疗前后的牙周探诊深度和牙周附着丧失情况。结果:两组治疗前后的牙周探诊深度和牙周附着丧失均比治疗前有明显减少,有统计学意义。组间比较,无统计学意义。固定后即刻异物感评价,B组优于A组,有统计学意义。结论:对于下前牙松动的患者,洁治、刮治和根面平整后使用Quartz splint^(TM)高强度石英纤维和Super-Bond C&B粘结剂牙周夹板固定,均可以使牙周状况明显改善。Super-Bond C&B粘结剂牙周夹板异物感小于Quartz splint^(TM)高强度石英纤维。

3种粘接剂分别粘接金属托槽至抛光及上釉锆瓷的粘接强度

目的:研究3种粘接剂对抛光及上釉锆瓷与正畸金属托槽粘接强度和耐久性的影响。方法:选用2种通用型粘接剂Single Bond Universal(SBU)和Prime&Bond Universal(PBU),以TransbondTMMIP(TM)为对照分别将抛光组、上釉组锆瓷与上颌中切牙金属托槽粘接,试样共6组(n=20)。水浴或水浴+冷热循环储存后测试全部试件剪切粘接强度(SBS),分析断裂形态以及粘接剂残留指数(ARI)。结果:粘接剂(P<0.001)和储存条件(P<0.001)显著影响锆瓷与托槽的剪切粘接强度;抛光或上釉(P=0.09)组间无统计学差异。SBU在各组中都表现出较强的粘接强度和较低的ARI,3种粘接剂间的ARI分数存在显著差异(P<0.001)。结论:粘接金属托槽与抛光及上釉锆瓷时,SBU较PBU和TM有更好的粘接性能。