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1.
Odovtos (En línea) ; 24(3)dic. 2022.
Article in English | LILACS-Express | LILACS, SaludCR | ID: biblio-1406167

ABSTRACT

Abstract The purpose of this study was to compare the effect of different disinfection protocols of dentin on bond strength of an MDP-containing universal adhesive. Twelve extracted mandibular third molars were separated horizontally at the mid-coronal of crown to get smooth and sound dentin surfaces using low-speed diamond saw. The teeth were randomly fallen into four groups: chlorhexidine (CHX), ozone, Er,Cr:YSGG laser irradiation (LASER) and no treatment (control). After cavity disinfection application, a universal adhesive (G-Premio Bond) was applied to the surface of dentin according to self-etch mode as instructed by the manufacturer. After incremental built-up of composite resin (Charisma Smart), the specimens were immersed in distilled water at 37°C for 24h. Dentin/composite beams with 1 mm² cross sectional area were produced and micro-tensile bond strength (µTBS) was applied on these beams (n=20). Failure mods were determined under a stereomicroscope at ×40. The resin penetration of samples stained with Rhodamine B fluorochrome dye was examined with a confocal laser scanning microscope. Statistical analysis was performed with SPSS-22. Test results were analyzed using One-way Anova and Tukey HSD Post-Hoc tests (p0.5). All applications of cavity disinfection procedures decreased the µTBS of the resin-dentin interface.


Resumen El propósito de este estudio fue comparar el efecto de diferentes protocolos de desinfección de la dentina sobre la fuerza de unión de un adhesivo universal que contiene MDP. Doce terceros molares mandibulares extraídos se quebraron horizontalmente en la mitad de la corona para obtener superficies de dentina lisas y sólidas utilizando una sierra de diamante de baja velocidad. Los dientes se dividieron aleatoriamente en cuatro grupos: clorhexidina (CHX), ozono, irradiación con láser Er,Cr:YSGG (LASER) y ningún tratamiento (control). Después de la aplicación de la desinfección de la cavidad, se aplicó un adhesivo universal (G-Premio Bond) a la superficie de la dentina según el modo de autograbado indicado por el fabricante. Después de la obturación con resina compuesta (Charisma Smart), las muestras se sumergieron en agua destilada a 37°C durante 24h. Se produjeron porciones de dentina/resina con un área de sección transversal de 1 mm² y se aplicó una fuerza de adhesión microtensile (µTBS) (n=20). Los modos de falla se determinaron bajo un microscopio estereoscópico a ×40. La penetración de la resina de las muestras teñidas con colorante fluorocromo rodamina B se examinó con un microscopio de barrido láser confocal. El análisis estadístico se realizó con SPSS-22. Los resultados de las pruebas se analizaron utilizando las pruebas post-hoc Anova unidireccional y Tukey HSD (p0.5). Todas las aplicaciones de procedimientos de desinfección de cavidades redujeron el µTBS de la interfaz resina-dentina.


Subject(s)
Humans , Disinfection , Disinfectants/therapeutic use , Mouth , Turkey
2.
Acta Pharmaceutica Sinica B ; (6): 451-466, 2022.
Article in English | WPRIM | ID: wpr-929306

ABSTRACT

The combination of chemotherapy and immunotherapy motivates a potent immune system by triggering immunogenic cell death (ICD), showing great potential in inhibiting tumor growth and improving the immunosuppressive tumor microenvironment (ITM). However, the therapeutic effectiveness has been restricted by inferior drug bioavailability. Herein, we reported a universal bioresponsive doxorubicin (DOX)-based nanogel to achieve tumor-specific co-delivery of drugs. DOX-based mannose nanogels (DM NGs) was designed and choosed as an example to elucidate the mechanism of combined chemo-immunotherapy. As expected, the DM NGs exhibited prominent micellar stability, selective drug release and prolonged survival time, benefited from the enhanced tumor permeability and prolonged blood circulation. We discovered that the DOX delivered by DM NGs could induce powerful anti-tumor immune response facilitated by promoting ICD. Meanwhile, the released mannose from DM NGs was proved as a powerful and synergetic treatment for breast cancer in vitro and in vivo, via damaging the glucose metabolism in glycolysis and the tricarboxylic acid cycle. Overall, the regulation of tumor microenvironment with DOX-based nanogel is expected to be an effectual candidate strategy to overcome the current limitations of ICD-based immunotherapy, offering a paradigm for the exploitation of immunomodulatory nanomedicines.

3.
Acta Pharmaceutica Sinica B ; (6): 1047-1055, 2021.
Article in English | WPRIM | ID: wpr-881184

ABSTRACT

Psoriasis is an autoimmune inflammatory disease, where dendritic cells (DCs) play an important role in its pathogenesis. In our previous work, we have demonstrated that topical delivery of curcumin-loaded poly (lactic-

4.
Acta Pharmaceutica Sinica B ; (6): 505-519, 2021.
Article in English | WPRIM | ID: wpr-881150

ABSTRACT

Psoriatic arthritis (PsA) is a complicated psoriasis comorbidity with manifestations of psoriatic skin and arthritic joints, and tailoring specific treatment strategies for simultaneously delivering different drugs to different action sites in PsA remains challenging. We developed a need-based layered dissolving microneedle (MN) system loading immunosuppressant tacrolimus (TAC) and anti-inflammatory diclofenac (DIC) in different layers of MNs,

5.
Article in Chinese | WPRIM | ID: wpr-873686

ABSTRACT

@#Dental bonding technology and materials have been used widely in dentistry because of their excellent properties. The development of novel bonding technology and materials is constantly being performed to improve the effect of dental bonding restorations. Observation and analysis of the dental bonding interface is one of the most important methods for laboratory evaluation of bonding efficiency. This paper aims to review the methods of observation and analysis of dental bonding interfaces to provide a reference for the selection of evaluation methods in dental bonding research. The features of 6 methods, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), confocal laser scanning microscopy (CLSM), Raman spectroscopy (RS), optical coherence tomography (OCT) and atomic force microscopy (AFM), were described and summarized. Among these methods, SEM and TEM are used most often in the analysis of fine structures; CLSM and OCT are used for the acquisition of characteristic image signals, such as microleakage and exogenous and endogenous fluorescence; and RS and AFM can test chemical composition and mechanical properties.

6.
Acta Pharmaceutica Sinica B ; (6): 2585-2604, 2021.
Article in English | WPRIM | ID: wpr-888873

ABSTRACT

Invasive fungal infections (IFIs) represent a growing public concern for clinicians to manage in many medical settings, with substantial associated morbidities and mortalities. Among many current therapeutic options for the treatment of IFIs, amphotericin B (AmB) is the most frequently used drug. AmB is considered as a first-line drug in the clinic that has strong antifungal activity and less resistance. In this review, we summarized the most promising research efforts on nanocarriers for AmB delivery and highlighted their efficacy and safety for treating IFIs. We have also discussed the mechanism of actions of AmB, rationale for treating IFIs, and recent advances in formulating AmB for clinical use. Finally, this review discusses some practical considerations and provides recommendations for future studies in applying AmB for combating IFIs.

7.
Acta Pharmaceutica Sinica B ; (6): 2004-2015, 2021.
Article in English | WPRIM | ID: wpr-888848

ABSTRACT

Hepatocellular carcinoma (HCC) has been known as the second common leading cancer worldwide, as it responds poorly to both chemotherapy and medication. Triptolide (TP), a diterpenoid triepoxide, is a promising treatment agent for its effective anticancer effect on multiple cancers including HCC. However, its clinical application has been limited owing to its severe systemic toxicities, low solubility, and fast elimination in the body. Therefore, to overcome the above obstacles, photo-activatable liposomes (LP) integrated with both photosensitizer Ce6 and chemotherapeutic drug TP (TP/Ce6-LP) was designed in the pursuit of controlled drug release and synergetic photodynamic therapy in HCC therapy. The TP encapsulated in liposomes accumulated to the tumor site due to the enhanced permeability and retention (EPR) effect. Under laser irradiation, the photosensitizer Ce6 generated reactive oxygen species (ROS) and further oxidized the unsaturated phospholipids. In this way, the liposomes were destroyed to release TP. TP/Ce6-LP with NIR laser irradiation (TP/Ce6-LP+L) showed the best anti-tumor effect both

8.
Acta Pharmaceutica Sinica B ; (6): 3262-3271, 2021.
Article in English | WPRIM | ID: wpr-922792

ABSTRACT

Tumor metastasis is responsible for chemotherapeutic failure and cancer-related death. Moreover, circulating tumor cell (CTC) clusters play a pivotal role in tumor metastasis. Herein, we develop cancer-specific calcium nanoregulators to suppress the generation and circulation of CTC clusters by cancer membrane-coated digoxin (DIG) and doxorubicin (DOX) co-encapsulated PLGA nanoparticles (CPDDs). CPDDs could precisely target the homologous primary tumor cells and CTC clusters in blood and lymphatic circulation. Intriguingly, CPDDs induce the accumulation of intracellular Ca

9.
Acta Pharmaceutica Sinica B ; (6): 3244-3261, 2021.
Article in English | WPRIM | ID: wpr-922791

ABSTRACT

Major challenges for cancer treatment are how to effectively eliminate primary tumor and sufficiently induce immunogenic cell death (ICD) to provoke a robust immune response for metastasis control. Here, a self-assembled cascade bioreactor was developed to improve cancer treatment with enhanced tumor penetration and synergistic therapy of starvation, chemodynamic (CDT) and photothermal therapy. Ultrasmall FeS-GOx nanodots were synthesized with glucose oxidase (GOx) as template and induced by paclitaxel (PTX) to form self-assembling FeS-GOx@PTX (FGP)

10.
Braz. dent. j ; 31(2): 109-115, Mar.-Apr. 2020. tab, graf
Article in English | LILACS, BBO | ID: biblio-1132277

ABSTRACT

Abstract This study aimed to evaluate penetrability on dentinal tubule of a new bioceramic sealer through confocal laser scanning microscopy (CLSM). A specific fluorophore (Fluo-3) was mixed with the sealer. Forty distobuccal roots from maxillary molars were selected, and root canal preparation was carried out with Wave One Gold # 35.06 instruments. Roots were randomly assigned to 4 groups according to the filling procedures: Bioceramic/Lentulo (Sealer Plus BC); Bioceramic/EasyClean group, three activation of the sealer (3x20 s) with Easy Clean instrument; Bioceramic/Irrisonic: ultrasonic activation for 30 s; and AHplus/Lentulo: epoxy resin based sealer (AH Plus) was utilized with the same protocol as the BC/LE group. After 72 h, specimens were transversally sectioned at 2 and 7 mm from root apex and then analyzed through CLSM. Sealer penetration area on dentinal tubule was measured by Adobe Photoshop CC2018. Kruskal Wallis and Wilcoxon T tests were carried out. Penetrability results were similar for both sealers regardless of which technique was performed to activate them inside the root canal (p>0.05). It is reasonable to conclude that penetration of bioceramic and epoxy resin based sealers occurred unimpressively. The type of instrument used to activate bioceramic sealer did not affect penetrability. Fluo 3 should be recommended as the fluorophore to evaluate dentinal tubule penetration of bioceramic sealers.


Resumo Este estudo objetivou avaliar a penetração nos túbulos dentinários de um novo cimento biocerâmico utilizando microscopia confocal de varredura a laser (MCVL). Um fluoróforo específico (Fluo-3) foi misturado com o cimento. Quarenta raízes distovestibulares de molares superiores foram selecionados e o preparo do canal radicular foi realizado com instrumentos Wave One Gold #35.06. As raízes foram divididas randomicamente em quatro grupos de acordo com os procedimentos obturadores: Bioceramic/Lentulo: cimento biocerâmico (Sealer Plus BC); Bioceramic/EasyClean: três ativações do cimento com instrumento Easy Clean (3 x 20 s); Bioceramic/Irrisonic: ativação ultrassônica do cimento por 30 s e AHplus/Lentulo: cimento à base de resina epóxica (AH Plus) foi utilizado com o mesmo protocolo que o grupo Bioceramic/Lentulo. Após 72h, os espécimes foram seccionados transversalmente em 2 e 7 mm do ápice radicular e analisados com MCVL. A área de penetração nos túbulos dentinários foi mensurada com Adobe Photoshop CC2018. O teste de Kruskal Wallis e T de Wilcoxon foram realizados. Os resultados de penetração foram similares para ambos os cimentos independentemente de qual técnica foi utilizada para ativá-los no interior do canal radicular (p>0,05). É razoável concluir que a penetração de cimentos biocerâmicos e à base de resina epóxica ocorreram de forma pouco expressiva. O tipo de ativação do cimento biocerâmcio não afeta sua penetrabilidade nos túbulos dentinários. Fluo 3 deve ser recomendado como o fluoróforo para avaliar a penetração intratubular de cimentos biocerâmicos.


Subject(s)
Root Canal Filling Materials , Calcium , Root Canal Obturation , Silicates , Calcium Compounds , Microscopy, Confocal , Dental Pulp Cavity , Epoxy Resins
11.
Acta Pharmaceutica Sinica B ; (6): 529-545, 2020.
Article in English | WPRIM | ID: wpr-792991

ABSTRACT

The limited penetration of nanoparticles and their poor accessibility to cancer cell fractions in tumor remain essential challenges for effective anticancer therapy. Herein, we designed a targeting peptide-decorated biomimetic lipoprotein (termed as BL-RD) to enable their deep penetration and efficient accessibility to cancer cell fractions in a tumor, thereby improving the combinational chemo-photodynamic therapy of triple negative breast cancer. BL-RD was composed of phospholipids, apolipoprotein A1 mimetic peptide (PK22), targeting peptide-conjugated cytotoxic mertansine (RM) and photodynamic agents of DiIC18(5) (DiD). The counterpart biomimetic lipoprotein system without RM (termed as BL-D) was fabricated as control. Both BL-D and BL-RD were nanometer-sized particles with a mean diameter of less than 30 nm and could be efficiently internalized by cancer cells. After intravenous injection, they can be specifically accumulated at tumor sites. When comparing to the counterpart BL-D, BL-RD displayed superior capability to permeate across the tumor mass, extravasate from tumor vasculature to distant regions and efficiently access the cancer cell fractions in a solid tumor, thus producing noticeable depression of the tumor growth. Taken together, BL-RD can be a promising delivery nanoplatform with prominent tumor-penetrating and cancer cells-accessing capability for effective tumor therapy.

12.
International Eye Science ; (12): 1295-1298, 2020.
Article in Chinese | WPRIM | ID: wpr-822264

ABSTRACT

@#AIM: To analyze and study the corneal nerve invasion phenomenon of Bowman's membrane in patients with IIIA lattice corneal dystrophy by confocal laser scanning microscopy. Quantitative analysis of 10a continuous observation image data was performed, followed by self-control studies.<p>METHODS: A total of 10 patients(13 eyes)with IIIA Lattice corneal dystrophy were continuously examined by confocal laser scanning microscopy. The data were observed and analyzed. <p>RESULTS: The normal corneal nerve of Bowman's membrane(Grade 0)of IIIA LCD patients gradually decreased with the prolongation of observation time. The nerves of grade I to V involved(amyloid-wrapped nerve fibers)gradually increased correspondingly. So suggested that the corneal nerve invasion of Bowman's membrane(amyloid deposits)in patients with IIIA LCD were gradually increasing with time. <p>CONCLUSION: In patients with type ⅢA lattice corneal dystrophy, there is a neurotropic phenomenon in Bowman's membrane, which gradually worsens with the aggravation of the lesion. This lesion can explain the recurrent epithelial damage of the IIIA LCD from some degrees. Continuous observation of patients with type IIIA LCD by corneal laser confocal microscopy can well understand the development of the lesion and explain its clinical manifestations.

13.
Braz. dent. sci ; 23(3): 1-8, 2020. ilus
Article in English | LILACS, BBO | ID: biblio-1104271

ABSTRACT

Objective: The influence of four root canal filling techniques on the penetration of an endodontic sealer into dentinal tubules and the gutta percha/ sealer ratio (GP/SR) in root canals was evaluated using confocal laser scanning microscopy (CLSM). Material and Methods: Roots of the maxillary central incisors (n=40) were prepared with ProTaper Universal files up to file F5 and assigned to five groups: continuous wave condensation, lateral condensation, single cone, Thermafill®, and negative control group. After root canal filling with gutta-percha and AH26, along with the addition of 0.01% fluorescein, the roots were cut into 2-mm slices. Using CLSM, the specimens were transversely sectioned at 3, 6, and 10 mm from the apex. Results: Sealer penetration was deeper and more frequent at 10 mm than at the 6mm and 3mm for all obturation technique. Penetration was not significantly affected by obturation techniques except single master cone tecnique. Single cone technique demonstrated the lowest sealer penetration at all levels. However, sealer thickness was strongly dependent on obturation technique. Termafill® demostrated superior GP ratio followed by continuous wave condensation, lateral condensation and single cone. Conclusion: In conclusion, the single cone technique resulted in lower sealer penetration than the other techniques, which did not differ significantly from each other. However, sealer thickness was strongly dependent on obturation technique. Termafill® demostrated superior GP ratio followed by continuous wave condensation, lateral condensation and single cone. (AU)


Objetivo: A influência de quatro técnicas de obturação do canal radicular na penetração de um cimento endodôntico nos túbulos dentinários e a relação gutapercha / cimento (GP / CIM) em canais radiculares foram avaliadas por microscopia de varredura confocal a laser (MVCL). Material e Métodos: As raízes de incisivos centrais superiores (n = 40) foram preparadas com limas ProTaper Universal até a lima F5 e distribuídas em cinco grupos: condensação de onda contínua, condensação lateral, cone único, Thermafill® e grupo de controle negativo. Após o preenchimento do canal radicular com guta-percha e AH26, juntamente com a adição de 0,01% de fluoresceína, as raízes foram cortadas em fatias de 2 mm. Usando MVCL, as amostras foram seccionadas transversalmente a 3, 6 e 10 mm do ápice. Resultados: A penetração do cimento foi mais profunda e mais frequente em 10 mm do que nos 6 mm e 3 mm para todas as técnicas de obturação. A penetração não foi significativamente afetada pelas técnicas de obturação, exceto pela técnica de cone mestre único. A técnica de cone único demonstrou a menor penetração do cimento em todos os níveis. No entanto, a espessura do cimento foi fortemente dependente da técnica de obturação. O Termafill® demonstrou uma relação superior de GP, seguida por condensação de onda contínua, condensação lateral e cone único. Conclusão: Em conclusão, a técnica de cone único resultou em menor penetração do cimento do que as outras técnicas, que não diferiram significativamente uma da outra. No entanto, a espessura do cimento foi fortemente dependente da técnica de obturação. O Termafill® demonstrou uma relação superior de GP, seguida por condensação contínua das ondas, condensação lateral e cone único. (AU)


Subject(s)
Root Canal Obturation , Microscopy, Confocal , Dental Cements , Gutta-Percha
14.
Article in Chinese | WPRIM | ID: wpr-815377

ABSTRACT

Objective@#To observe the permeability of four kinds of self-etching adhesives in aged glass-fiber-reinforced composite (GFRC).@*Methods@#After light polymerization following the manufacturers’ instructions, a total of 80 pieces of bisphenol-A-glycodal-methacrylate (Bis-GMA)+ polymethyl methacrylate (PMMA) based GFRC were randomly divided into two main groups: test group and control group, each group was then divided into four subgroups with 10 samples for each subgroup. While the test group was conducted to be aged through thermocycling at 5 ℃/55 ℃, the control group remained fresh. After the addition of a fluorescent dye (rhodamine-B-isothiocyanate), four self-etching adhesives AdperEasy One (AEO), S 3 BOND (S 3B), Tetric N-Bond Self-Etch (TNB), G-Bond (GB) were correspondently applied to the test and control groups and were light polymerized. Specimens were sectioned using hard tissue cutting and grinding system. Slices from each subgroup were observed under a confocal laser scanning microscope, the depth of dye permeation (DDP) under the surface of GFRC in each group was measured and the Results were statistically analyzed.@*Results@#The DDP of AEO was the deepest (32.58 ± 6.06) μm, and that of TNB was the shallowest (6.19 ± 1.38)μm among the four self-etching adhesive subgroups in the control group. The order of each group was AEO > GB > S 3B > TNB. The DDP of the four subgroups in the test group was significantly shallower than that in the control group (P < 0.05). The change in GB was the greatest (9.05 ± 2.35)μm/(28.93 ± 5.32)μm. In the test group, the DDP in AEO was the deepest (28.42 ± 5.32)μm, and the DDP in TNB was shallowest (1.93 ± 0.22)μm again. The order of each group was AEO > S 3B > GB > TNB. In the test group, while the layer of fluorescent dye of AEO and S 3 B could still be seen distinctly, that of TNB and GB was hard to recognize. @*The DDP of AEO was the deepest (32.58 ± 6.06) μm, and that of TNB was the shallowest (6.19 ± 1.38)μm among the four self-etching adhesive subgroups in the control group. The order of each group was AEO > GB > S 3B > TNB. The DDP of the four subgroups in the test group was significantly shallower than that in the control group (P < 0.05). The change in GB was the greatest (9.05 ± 2.35)μm/(28.93 ± 5.32)μm. In the test group, the DDP in AEO was the deepest (28.42 ± 5.32)μm, and the DDP in TNB was shallowest (1.93 ± 0.22)μm again. The order of each group was AEO > S 3B > GB > TNB. In the test group, while the layer of fluorescent dye of AEO and S 3 B could still be seen distinctly, that of TNB and GB was hard to recognize. @#The self-etching adhesives of AEO and S 3 B still have good permeation effect in this kind of aged GFRC, which can help to establish a good bond between these aged GFRC and the subsequent repair of composite resin.

15.
Braz. dent. j ; 30(1): 36-42, Jan.-Feb. 2019. tab, graf
Article in English | LILACS | ID: biblio-989435

ABSTRACT

Abstract Maltodextrins, derived from corn starch, have been added to industrialized food combined with sucrose. However it is not clear the diffusion properties of the dental biofilm matrix and the tridimensional structure of multispecies biofilms formed in the presence of these carbohydrates. Therefore, the aim of study was to investigate by confocal laser scanning microscopy (CLSM) the structural organization of the multispecies dental biofilm formed in situ under exposure to sucrose associated to maltodextrin. Adult volunteers wore an intraoral palatal appliance containing bovine enamel blocks. They were instructed to remove the appliance 8 times per day and drop the following solutions on the enamel blocks: deionized distilled water (DDW), maltodextrin, sucrose + maltodextrin or sucrose. Biofilms formed were stained and the percentage of extracellular polysaccharide (%EPS) and thickness were determined by CLSM. Biofilm formed in the presence of sucrose and sucrose + maltodextrin presented similar %EPS and higher than DDW and maltodextrin. Regarding to the biofilm thickness, sucrose and sucrose + maltodextrin treatments were thicker than DDW and maltodextrin and similar between them. The structural organization of the multispecies dental biofilm formed in situ in the presence of sucrose does not change when this carbohydrate is associated to maltodextrin.


Resumo Maltodextrinas, derivadas do amido de milho, tem sido adicionadas a alimentos industrializados combinadas à sacarose. Entretanto não estão esclarecidas as propriedades de difusão na matriz do biofilme dental e a estrutura tridimensional de biofilmes multiespécies formados na presença destes carboidratos. Portanto o objetivo deste estudo foi avaliar, através da microscopia confocal de escaneamento a laser (MCEL), a organização estrutural do biofilme dentário multiespécie formado in situ exposto à sacarose associada a maltodextrina. Voluntários adultos utilizaram dispositivos intraorais palatinos contendo blocos de esmalte bovino. Eles foram instruídos a remover os dispositivos 8 vezes por dia e gotejar as seguintes soluções sobre os blocos de esmalte: água destilada e deionizada (ADD), maltodextrina, sacarose+maltodextrina ou sacarose. Os biofilmes formados foram corados e o percentual de polissacarídeos extracelulares (%PEC) e suas espessuras foram determinados através da MCEL. Os biofilmes formados na presença de sacarose e sacarose+maltodextrina apresentaram os %PEC similares entre si, entretanto maiores do que os grupos submetidos a ADD e maltodextrina. Em relação à espessura do biofilme formado, os tratamentos sacarose e sacarose+maltodextrina apresentaram espessuras similares entre si, e maiores quando comparados aos grupos ADD e maltodextrina. A organização estrutural do biofilme dentário multiespécie formado in situ na presença de sacarose não é alterado quando este carbiodrato é associado a maltodextrina.


Subject(s)
Humans , Adult , Young Adult , Polysaccharides/metabolism , Sucrose/metabolism , Biofilms , Orthodontic Appliances , Double-Blind Method , Microscopy, Confocal , Cross-Over Studies
16.
International Eye Science ; (12): 35-41, 2019.
Article in Chinese | WPRIM | ID: wpr-688256

ABSTRACT

@#AIM: To observe the clinical therapeutic efficiency of 1g/L sodium hyaluronate eye drops on ocular surface disorders in patients with proliferative diabetic retinopathy(PDR)after 20G pars plana vitrectomy(PPV). <p>METHODS: Randomized single blind case control study was used. Patients with type 2 diabetes who were admitted to the department of ophthalmology, Xi'an No.4 Hospital for PDR and underwent 20G PPV surgery by the same surgeon were randomly divided into PDR control group(Group A)and sodium hyaluronate treatment group(Group B). Group B received continuous 1g/L sodium hyaluronate eye drops from 1d to 2mo after surgery. Before and 1wk, 1, 3mo after surgery, OSDI, SⅠt, BUT, fluorescein cornea staining(FL)and the tear film and corneal epithelial cell layer under corneal laser scanning confocal microscopy of the two groups were compared. <p>RESULTS:A total of 90 cases and 90 eyes were studied. In preoperative time, the two groups showed obvious dry eye syndrome, and compared with the control subjects, there were no significant difference existed between the two groups(<i>P</i>>0.05). In group A, ocular surface injury was further aggravated after surgery and failed to recover with time extension during the observation period.Some indexes of Group B improved at different observation time after surgery compared with those before surgery, and there were significant differences between group A and Group B after surgery(<i>P</i><0.05). <p>CONCLUSION: Applying 1g/L sodium hyaluronate eye drops could relief the uncomfortable feeling of ocular surface in patients with PDR after 20G vitrectomy and accelerate the recovery of ocular surface disorders.

17.
Article in Chinese | WPRIM | ID: wpr-756574

ABSTRACT

Objective To provide useful reference for the pre-operative design and operation by 3D reconstruction and simulation techniques in rhinoplasty.Methods From October 2016 to March 2017,the laser scanning and 3D reconstruction were performed on 25 patients before operations.The facial morphology and the simulated effect were ontained.All patients were female and they were 18 to 39 years old.The average age was 26 years old.The outline and form were normal.We discussed with patients to confirm the ideal nasal 3D simulated effect.In the process of operation,we were guided by the data of soft measures and 3D printing model.Results Among 25 patients who werefollowed up postoperatively.We got intuitive,accurate 3D reconstruction graphs and simulated surgery procedures in all cases.Being applied to actual surgery procedure,23 patients were satisfactory with postoperational results.Two patient's nasal tip dropped.We were satisfied with the results after repair.Conclusions 3D reconstruction and simulation techniques improve surgical precision and operation planning selection,which is a good aided method in rhinoplasty.

18.
Article in Chinese | WPRIM | ID: wpr-755939

ABSTRACT

Objective To assess the quality of donor liver allografts by employing laser scanning confocal microscope (LSCM ) and clinical liver function tests .Methods Sprague-Dawley rats were used for establishing cold ischemia models of liver allografts .According to different timepoints of cold ischemia ,four groups of CIT1h ,CIT6h ,CIT12h and CIT24h were designated .At the end of cold ischemia time (CIT) of each group , perfusion and preservation fluids were collected and fluoresceins perfused . After LSCM examinations ,tissue samples were harvested for HE examination .Finally a comparison was made between LSCM results and hematoxylin & eosin (HE) examinations .Also some relevant clinical parameters were detected in preserving and flushing fluids .Results Both LSCM examination and pathological examination indicated that the quality of liver allografts decreased significantly with the elapsing of time . Only the difference of LDH was statistically significant (P<0 .001) .Conclusions LSCM may be used for evaluating the ex vivo qualities of liver allografts .Simple handling and time efficiency re great advantages of LSCM .As compared with alanine transaminase (ALT ) and aspartate transaminase (AST ) ,LDH is a better indicator reflecting the quality of liver allografts .

19.
Article in English | WPRIM | ID: wpr-742067

ABSTRACT

PURPOSE: To evaluate and compare the effect of different materials and techniques on the shear bond strength of veneering ceramic materials to zirconia. MATERIALS AND METHODS: 136 sintered zirconia cubes were prepared and randomly divided into four study groups according to corresponding methods of surface treatment and materials: GLN (grinding followed by laser scanning using Noritake Cerabien ZR), SLN (sandblasting followed by laser scanning using Noritake Cerabien ZR), GLV (grinding followed by laser scanning using VITA VM 9), and SLV (sandblasting followed by laser scanning using VITA VM 9). Spraying technique was performed to coat the core. Profilometer, SEM, XRD, EDS, universal testing machine, and stereomicroscope were used to record surface roughness Ra, surface morphology, phase transformation, elemental compositions, shear bond strength SBS values, and failure types, respectively. Specimens were investigated in unaged (not immersed in artificial saliva) and aged (stored in artificial saliva for a month) conditions to evaluate SBS values. RESULTS: Grinding and GLN as first and second surface treatments provided satisfactory Ra values in both conditions (1.05 ± 0.24 µm, 1.30 ± 0.21 µm) compared to sandblasting and other groups (P < .05). The group GLN showed the highest SBS values in both conditions (30.97 ± 3.12 MPa, 29.09 ± 4.17 MPa), while group SLV recorded the lowest (23.96 ± 3.60 MPa, 22.95 ± 3.68 Mpa) (P < .05). Sandblasting showed phase transformation from t-m. Mixed failure type was the commonest among all groups. CONCLUSION: GLN showed to be a reliable method which provided satisfactory bond strength between the veneer ceramic and zirconia. This method might preserve the integrity of fixed dental crowns.


Subject(s)
Ceramics , Crowns , Methods , Saliva, Artificial
20.
Article in Chinese | WPRIM | ID: wpr-815830

ABSTRACT

Objective@#To study the effects of serum and its components on biofilm formation of Pseudomonas aeruginosa. @*Methods@#96 well microplates combined with crystal violet staining was used to detect the effects of serum, albumin and transferrin on biofilm formation of Pseudomonas aeruginosa. And confocal laser scanning microscope was used to observe the morphology of the biofilm. @*Results@#The biofilm of PAO1 was significantly enhanced from 2.26±0.42 to 3.42±0.08(t=4.71, p<0.01)with horse serum and but reduced to 0.807±0.10(t=4.71,p<0.01) by human serum; And the total biofilm biomass was significantly increased and clump-changed with horse serum, but decreased and scattered in distribution by human serum. Besides, horse serum could also enhance the biofilm formation of part of the clinical isolates of Pseudomonas aeruginosa, however, human serum could inhibit the biofilm formation of all of the clinical isolates. And 2.5g/L albumin could significantly enhance the biofilm of PAO1 from 1.96±0.22 to 2.54±0.18(t=3.55,p<0.05), but 5 g/L could reduce the biofilm of PAO1 from 1.85±0.36 to 0.84±0.24(t=4.03,p<0.05).@*Conclusion@#Horse serum and albumin could significantly promote the biofilm formation of Pseudomonas aeruginosa, but human serum and transferrin could decrease its biofilm formation.

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