The Mechanical Behavior of Water Vapor-Treated HA Coating Produced by Plasma Spraying Technique

2005 ◽  
Vol 288-289 ◽  
pp. 355-358
Author(s):  
Y. Cao ◽  
Bo Zhang ◽  
Li Ping Wang ◽  
Qiang Lin ◽  
Xu Dong Li ◽  
...  
Keyword(s):  
Water Vapor ◽  
Bond Strength ◽  
Mechanical Behavior ◽  
Metal Substrate ◽  
Ha Coating ◽  
Plasma Sprayed ◽  
Push Out ◽  
Vapor Treatment

Plasma-sprayed hydroxyapatite coating on metal substrate was prepared. Two kind of post-treatment methods were been applied to the coating, treatment in air at 650°C for 30 min and treatment in water vapor at 125°C with a pressure of 0.15MPa for 6 hours. XRD showed that the HA nanocrystals increased after water vapor treatment. The interfacial tensile bond strength between HA and substrate was 45.0±1.82MPa, 39.1±1.27MPa and 30.3±1.61MPa for as-received coatings, water vapor treated coatings and heated in air coatings, respectively. 3 months after implantation in dogs limbs, the push-out strength between implants and bone was 11.27±2.71MPa, 11.63±3.11MPa, 23.92± 2.01MPa and 18.8± 1.82MPa for pure Ti implants, as-received coating implants, water vapor treated implants and heated in air implants, respectively. The results showed that the post-water vapor treated HA coating have better mechanical behavior in vitro and in vivo

The Effect of Post-Treatment on the Mechanical Behavior of Plasma Sprayed HA Coating

2005 ◽  
Vol 284-286 ◽  
pp. 337-340 ◽  
Author(s):  
Y. Cao ◽  
Bo Zhang ◽  
Li Ping Wang ◽  
Qiang Lin ◽  
Xu Dong Li ◽  
...  
Keyword(s):  
Water Vapor ◽  
Mechanical Behavior ◽  
Metal Substrate ◽  
Post Treatment ◽  
Treatment Methods ◽  
Ha Coating ◽  
Plasma Sprayed ◽  
Push Out

Plasma-sprayed hydroxyapatite coating on metal substrate has been prepared, two kinds of post-treatment methods have been used: (1) Heating in air at 650°C for 30 min, (2) Heating in water vapor at 125°C, 0.15Mpa for 6 hours. XRD showed that the nanocrystals of HA coating increased after water vapor treated. The interfacial tensiles strength between HA and the substrate were 45.0±1.82MPa, 39.1±1.27MPa and 30.3±1.61MPa for as-received coatings, water vapor treated coatings and heated in air coatings respectively. After 3 months implant in dogs limbs, the push-out strength between implants and bone were 11.27±2.71 MPa, 11.63±3.11MPa, 23.92± 2.01MPa and 18.8±1.82 MPa for pure Ti implants, as-received coating implants, water vapor treated implants and heated in air implants respectively. The results showed that the water vapor post treated HA coating have better mechanical behavior in vitro and in vivo.

Study on Plasma Sprayed Calcium Silicate Coatings

2005 ◽  
Vol 475-479 ◽  
pp. 2371-2374 ◽  
Author(s):  
Xue Bin Zheng ◽  
Xuan Yong Liu ◽  
Wei Chang Xue ◽  
Chuan Xian Ding
Keyword(s):  
Simulated Body Fluid ◽  
Bond Strength ◽  
Body Fluid ◽  
Strength Test ◽  
Dicalcium Silicate ◽  
Cell Culturing ◽  
Ha Coating ◽  
Plasma Sprayed

Wollastonite and dicalcium silicate coatings have been prepared on Ti-6Al-4V substrate via plasma spraying. Bond strength test, simulated body fluid (SBF) immersion, in vitro cell culturing, and in vivo implantation were carried out to evaluate their mechanical and biological characteristics. The results obtained showed that both coatings possess higher bond strength as compared with hydroxyapatite (HA) coating. In the meanwhile, the good bioactivity and biocompatibility were confirmed in this study.

The Effect of Cell Behavior on Plasma Sprayed HA Coatings with Different Post Treatment

2006 ◽  
Vol 309-311 ◽  
pp. 705-708 ◽  
Author(s):  
Y. Cao ◽  
Qiang Lin ◽  
Min Tang ◽  
X.Q. Ying ◽  
Su Juan Pang ◽  
...  
Keyword(s):  
Water Vapor ◽  
Cell Activity ◽  
Post Treatment ◽  
Biological Behavior ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Ha Coating ◽  
Surface Hydroxyl Groups ◽  
Plasma Sprayed

The initial interactions of plasma-sprayed HA coating surface with osteoblasts was investigated. Two kind of post-treatment methods were been used for HA coating: (1) Heated in air at 650oC for 30 min, (2) Heated in water vapor at 125oC, 0.15Mpa for 6 hours. The third passage rabbit osteoblasts were cultured on the HA coating plates for 24 h. The results showed: The lower dissolution rate and more surface hydroxyl groups (OH-1) group in the HA coating resulted in greater numbers of adhered osteoblasts and higher cell activity, The post-water vapor treated HA coating have better biological behavior in vitro.

scholarly journals Micro Push-Out Bond Strength of Resin Composite to Dentin in Primary Dentition Using Three Universal Adhesives with Different pH: An In Vitro Study

2021 ◽  
Vol 11 (14) ◽  
pp. 6349
Author(s):  
Regina María Del Río Carrillo ◽  
Pedro Molinero-Mourelle ◽  
Vicente Vera ◽  
Pablo Romero Villaba ◽  
Elizabeth Casañas ◽  
...  
Keyword(s):  
Bond Strength ◽  
Resin Composite ◽  
In Vitro Study ◽  
Primary Dentition ◽  
Vitro Study ◽  
Deciduous Tooth ◽  
Universal Adhesives ◽  
Type Of Failure ◽  
Push Out

To evaluate the bond strength of different universal adhesives on deciduous tooth dentineand their relationship with the composition and potential of hydrogen (pH). Methods: An in vitromicro push-out test on 150 samples (n = 50) per group per adhesive, namely, Adhese Universal(ADH; Ivoclar Vivadent), Futurabond U (FUT; Voco GmbH) (Test), and Scotchbond Universal withpre-conditioning (SCO; 3M) (Control), to record bond strength (BS) and type of adhesive failure.Results: The results of the different adhesives (megapascals (MPa)) varied, showing no statisticalsignificance. The corresponding averages are in MPa: ADH, 13.66 2.81; FUT, 14.48 2.88; SCO,14.98 3.96. Additionally, the frequency of type of failure was as follows: mixed (60.7%), adhesive(27.3%), and cohesive (12%). Conclusions: SCO, with a pH of 2.7, showed greater resistance tofracture, while FUT, with a pH of 2.3 and no pre-conditioning, approached the same values, being aone-step adhesive. No relationship was found between failure and type of adhesive.

scholarly journals Influence of Zingiber officinale Extract on Push-Out Bond Strength of Glass-Fiber Post

2018 ◽  
Vol 29 (1) ◽  
pp. 93-98 ◽  
Author(s):  
Tânia Mara da Silva ◽  
Virgílio Vilas Boas Fernandes Junior ◽  
Rosemary Soares de Santana ◽  
Renata Marques de Melo Marinho ◽  
Márcia Carneiro Valera ◽  
...  
Keyword(s):  
Bond Strength ◽  
Glass Fiber ◽  
Zingiber Officinale ◽  
Resin Cement ◽  
Fiber Post ◽  
Ginger Extract ◽  
Etch And Rinse ◽  
Glass Fiber Post ◽  
Push Out

Abstract The aim of this study was to evaluate in vitro the influence of 20% glycolic ginger extract on the bond strength of glass-fiber post cemented with etch-and-rinse or self-etching resin cement. Forty-eight bovine roots were standardized (17±0.5 mm) and randomly divided into two groups, according to irrigant used during biomechanical preparation: NaOCl: 1% sodium hypochlorite and GEN: 20% glycolic ginger extract. Root canal was prepared and randomly assigned to one of two subgroups (n=12), according to luting protocol: self-etching (RelyX U200) and etch-and-rinse (RelyX ARC). After 48 h, the roots were sectioned perpendicularly (4 in cervical third and 3 in middle third) and submitted to push-out bond strength test (50 kgf load cell, 1.0 mm/min). Failure mode was analyzed in SEM and stereomicroscopy. Data were analyzed by three-way ANOVA and Tukey tests (p<0.05). ANOVA revealed that there were no significant differences between U200 (2.01±0.17)B and ARC (1.93±0.12)B in GEN group, and at the cervical third for both irrigants, 2.69±0.16A and 2.54±0.17A, respectively. Middle third showed lower bond strength than cervical third, regardless the irrigant. Overall, the cervical third regardless the irrigant employed and the association between NaOCl and ARC, presented better adhesive performance.

scholarly journals Efficacy of Fiber Post Bonding To Root Dentin after Different Obturation Techniques and Cementation Timings: In Vitro Study

2018 ◽  
Vol 6 (9) ◽  
pp. 1707-1711
Author(s):  
Rami M. Atia ◽  
Nada Omar ◽  
Haidy Nabil ◽  
Yousra Aly
Keyword(s):  
Bond Strength ◽  
Statistical Significance ◽  
Testing Machine ◽  
In Vitro Study ◽  
Resin Cement ◽  
Vitro Study ◽  
Endodontically Treated Teeth ◽  
Root Dentin ◽  
Push Out

OBJECTIVE: The aim of this in vitro study was to assess the effect of obturation technique and cementation timings on the bonding of fibre-reinforced posts to the root canal walls. METHODS: Twenty extracted teeth were randomly allocated to two groups according to the obturation technique and cementation timing. Central incisors with single canals were used after being decoronated. Every extracted tooth of the {vertical compaction group} (VC) group (n = 10) had been obturated using the {E & Q plus obturation system} with posts cemented in the same day; The other (CO) conventional group (n = 10) teeth were obturated using the conventional lateral compaction technique and posts cemented after one week. “SF“ Fiber posts were used after bonding and cementation using Rely X ARC resin cement with all the endodontically treated teeth. The push-out test was performed in a universal testing machine. Data were analysed by 2 way analysis of variance with Statistical significance was set to 0.05. RESULTS: Heat softened gutta percha group showed more push out the bond strength of the bonded posts than the conventional obturation group (p < 0.05). In the middle region, there was no statistical significance between the two groups while there was significance in the coronal and apical thirds. CONCLUSION: The vertical compaction technique and early cementation improved the bond strength of the resin posts in comparison to the conventional obturation technique with late cementation.

scholarly journals Acid Challenge on Push-Out Bond Strength of Three Different Tricalcium Silicate Cements: An In-vitro Study

2021 ◽  
pp. 72-79
Author(s):  
Mattapudi Basavaiah Babu ◽  
T. B. V. G. Raju ◽  
N. Mahendra Varma ◽  
Gowtam Dev Dondapati ◽  
Srivalli Podili ◽  
...  
Keyword(s):  
Bond Strength ◽  
Critical Role ◽  
Compressive Load ◽  
Clinical Importance ◽  
Filling Material ◽  
Significant Difference ◽  
The Impact ◽  
Push Out ◽  
Acid Challenge

Aim: To evaluate the impact of environmental pH on intra-radicular dentin push-out bond strengths of MTA, MTA HP, and Biodentine. Materials and Methodology: Freshly extracted human mandibular single-rooted premolars or maxillary anterior incisors that were either intact or contained only small carious lesions were selected.120 mid root dentins is horizontally divided into 1.0 mm thick slices and divided into 3 MTA, MTA HP, BIODENTINE groups. The compressive load is applied at a speed of 0.5 mm/min by exerting a downward pressure on the outer surface of MTA using a 1.00 mm diameter cylindrical stainless-steel plunger. Maximum load to MTA was reported in newtons at the time of dislodgement and converted to megapascals. The 1-way analysis of variance test was used to compare the push-out bond strength of the groups with the same storage time (4 or 34 days), followed by the pair-wise comparison of the Tukey post hoc test. The Student's t-test was used to evaluate 3-group means. At P = .005, the degree of significance was set. Thus the clinical importance of the present study states that considering several factors like microhardness, composition by products, particle sizes and the environmental pH plays a critical role in selection of root end filling material. Results: There was significant difference between groups (P = .001) after 4 days of PBS and Acid condition, where Bio dentine had significantly the highest bond strength. Conclusion: The strength of MTA HP, BIODENTINE, MTA materials at dentine interface increases over 30 days in the storage of PBS solution at pH 7.4, after an initial acid challenge by acetic acid of pH 5.4, which decreases initial bond strength.

Comparative Evaluation of the Bioactive Behavior of HA and ZrO2 Reinforced Coatings

2011 ◽  
Vol 493-494 ◽  
pp. 447-452
Author(s):  
George Theodorou ◽  
Ourania Menti Goudouri ◽  
Lambrini Papadopoulou ◽  
Nikolaos Kantiranis ◽  
Subramaniam Yugeswaran ◽  
...  
Keyword(s):  
Steel Substrate ◽  
In Vitro Bioactivity ◽  
Biological Fixation ◽  
Metal Implants ◽  
Ha Coating ◽  
Biological Responses ◽  
Before And After ◽  
Sbf Solution ◽  
Plasma Sprayed

The clinical use of plasma-sprayed hydroxyapatite (HA) coatings on metal implants has been widely investigated as the HA coating can achieve the firm and direct biological fixation with the surrounding bone tissue. It is shown in previous studies that the mechanical properties of HA coatings are improved by the addition of ZrO2 particles during the deposition of the coating on the substrate. Subsequently, the cohesive and adhesive strengths of plasma-sprayed hydroxyapatite (HA) coatings were strengthened by the ZrO2 particles addition as a reinforcing agent in the HA coating (HA+ZrO2 composite coating). The aim of the present work is to investigate and evaluate the in vitro bioactivity assessment of HA and HA/ZrO2 coatings, on stainless steel substrate, soaked in c-SBF, in order to study and compare their biological responses. The coatings were produced using vapor plasma spraying (VPS). The characterization of the surface of the coatings before and after soaking in SBF solution was performed using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and X-ray Diffraction analysis (XRD). All samples were smoothed before insertion in the medium and the in vitro bioactivity of all coating samples was tested in conventional Simulated Body Fluid (c-SBF) solution for various immersion times.

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