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Effect Of Surface Treatments And Cyclic Fatigue On Mechanical Properties And Shear Bond Strength To Zirconia
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Book Synopsis Effect of Surface Treatments and Cyclic Fatigue on Mechanical Properties and Shear Bond Strength to Zirconia by : Alaaeldin Elraggal
Download or read book Effect of Surface Treatments and Cyclic Fatigue on Mechanical Properties and Shear Bond Strength to Zirconia written by Alaaeldin Elraggal and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Influence of Surface Treatment on Veneering Porcelain Shear Bond Strength to Zirconia After Cyclic Loading by : Atsushi Nishigori
Download or read book Influence of Surface Treatment on Veneering Porcelain Shear Bond Strength to Zirconia After Cyclic Loading written by Atsushi Nishigori and published by . This book was released on 2013 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Statement of problem: Yttria-partially stabilized tetragonal zirconia polycrystal (Y-TZP) all-ceramic restorations have been reported to suffer from chipping or cracking of the veneering porcelain (VP) as the most common complication. There is little information in the literature regarding the influence of surface treatment on VP shear bond strength to Y-TZP after cyclic loading. Purpose of this study: The goals of this study were (1) to investigate the influence of zirconia surface treatments on veneering porcelain shear bond strength and (2) to investigate the influence of cyclic loading on the shear bond strength between VP and Y-TZP. Materials and Methods: 48 cylinder-shaped specimens (6mm in diameter and 4mm in height) were divided into 4 groups containing 12 specimens each according to the surface treatment. As a control group (C), no further treatment was applied to the specimens after grinding. Group H was heat-treated as a pretreatment according to the manufacturer's recommendations. Group S was airborne-particle abraded with 50 μm alumina (Al2O3) particles under a pressure of 0.4 MPa for 10 seconds. In the group SH, the heat-treatment was performed after the airborne-particle abrasion. A VP cylinder (2.4 mm in diameter and 2 mm in height) was applied and fired on the prepared Y-TZP specimens. The shear bond strength was tested using a universal testing machine. Six specimens from each group were subjected to fatigue (10,000cycles, 1.5Hz, 10N load) before testing. Results: The 3-way ANOVA showed no statistically significant effect of surface treatment and cyclic loading on shear bond strength. The highest mean shear bond strength was recorded for the air-particle abrasion group without cyclic loading (34.1 + 10 MPa). The lowest mean shear bond strength was the air-particle abrasion group with cyclic loading (10.7 ± 15.4 MPa). Sidak multiple comparisons procedure demonstrated cyclic loading specimens had significantly lower shear bond strength than non-cyclic loading specimens after air-particle abrasion without heat treatment (p=0.0126) Conclusion: Within the limitations of this study, (1) Shear bond strength between Y-TZP and VP is not affected statistically by surface treatment using heat treatment, airborne-particle abrasion, and heat treatment after airborne-particle abrasion. (2) There is significant difference in shear bond strength with air-particle abrasion between with and without cyclic loading groups. This difference suggested that air-particle abrasion should be avoided in clinical situations as a surface treatment without heat treatment.
Book Synopsis Effect of Surface Treatments on Resin-Zirconia Bonding by : Fung Yan
Download or read book Effect of Surface Treatments on Resin-Zirconia Bonding written by Fung Yan and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Effect of Surface Treatments on Resin-zirconia Bonding" by Fung, Yan, 忻峰, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Zirconia offers a favorable choice for esthetic indirect dental restorations with excellent mechanical properties and biocompatibility. In the hostile oral environment, the longevity of dental restorations relies heavily on whether a strong and stable bond between the restoration and underlying supporting tooth structures can be achieved. However, unlike conventional ceramics, zirconia is a chemically inert material which makes it notoriously difficult to bond with any dental composite resin cement. This thesis aimed at developing and evaluating different zirconia surface pretreatments for improving the resin-zirconia bonding. The first laboratory experiment evaluated the effect of Er, Cr: YSGG laser treatment on topographic changes of zirconia surface. Laser parameters including power, irradiation time and water spray at different levels were tested and the treated zirconia surfaces were assessed by scanning electron microscope (SEM) and atomic force microscope (AFM). Results showed that all three tested laser parameters could affect the topographic changes of zirconia surface. Significant topographic changes were found when the power was set at 3.0 W with 50% water spray for 120 s or the power was set at 4.0 W with 75% water spray for 60 s. The second experiment evaluated the effects of grit-blasting (sandblasting), selective infiltration etching (SIE), 3.0 W and 4.0 W laser zirconia surface treatments on the resin-zirconia bonding. Resin composite was bonded to the treated zirconia which was then sectioned into resin-zirconia micro-beams of a standard size. Microtensile bond strength (MTBS) tests were performed for adhesion strength testing. In dry storage conditions, SIE, grit-blasting and 3.0 W laser groups showed significantly higher MTBSs than the control group while no difference in MTBSs was found between the 4.0 W laser group and the control group. After water storage, SIE treatment showed significant higher MTBSs than the remaining groups. MTBSs of water storage specimens were significantly less than the dry specimens except the ones in 4.0 W groups. Zirconia surface treatments could enhance the resin-zirconia bonding in dry storage conditions. The SIE treatment appeared to provide the strongest resin-zirconia adhesion despite hydrolytic degradation. The third experiment evaluated the fatigue performance of resin-zirconia bonding with different surface treatments. Resin-zirconia beams were prepared and loaded at 36 N with 1.5 Hz frequency for 104 cycles at room temperature, before sectioned for MTBS tests. In dry storage conditions, SIE and grit-blasting groups showed significantly higher MTBSs than the control group while no differences in MTBSs were found among the 3.0 W, 4.0 W and control groups. After fatigue loading, only the SIE and 3.0 W groups showed significantly lower MTBSs while the other groups did not. After water storage, MTBSs of water storage specimens were significantly less than the dry specimens except the ones in SIE and 4.0 W groups. No significant differences in MTBSs were found in all groups after fatigue loading. The SIE group showed significantly higher MTBSs than the other study groups after water storage and fatigue loading. In general, it could be concluded that water and cyclic fatigue environment could affect the resin-zirconia bonding. Subjects: Dental resins Dental bonding Surface treatments Zirconium oxide
Book Synopsis Some Surface Treatments for Improving the Durability of Zirconia-Based Restorations by : Dan Liu
Download or read book Some Surface Treatments for Improving the Durability of Zirconia-Based Restorations written by Dan Liu and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Some Surface Treatments for Improving the Durability of Zirconia-based Restorations" by Dan, Liu, 刘丹, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Zirconia has now been increasingly used in modern dental prosthetic practice due to its high mechanical strength, good esthetics, and excellent biocompatibility. However, the application of zirconia-based dental restorations is still constrained by its chemical inertness and the resultant relatively weak bonding properties, including porcelain to zirconia bonding, and resin to zirconia bonding. Therefore, many investigations have been carried out on the development of an effective method of surface modification on zirconia for improving its bonding ability. The aim of this laboratory study was to evaluate the effects of some new modified surface treatments on the adhesion durability of dental zirconia prosthetic system. In Part I and Part II, the application of laser surface treatment was examined. Laser energy was utilized and applied on zirconia surface before porcelain veneering procedure. Its influence on porcelain zirconia integration interface was mechanically tested and compared with sandblasting treatment. The changes in porcelain zirconia shear bond strength and mechanical strength values of zirconia with the modulation of output energy were recorded. In Part III and Part IV, several types of coating treatment, such as tribochemical approach, silica powder coating, and zirconium silicate coating, were compared with their effects on resin zirconia bonding. The changes in resin zirconia shear bond strength under different aging conditions were observed. The elemental analysis was also performed for clarifying the chemical composition of zirconia surface. The application of laser produced a flake-like micro-retentive structure on zirconia surface. Laser irradiation with the output energy higher than 11.3 W/cm2 was effective in increasing porcelain to zirconia bond strength values. The biaxial flexural strength of zirconia was not significantly affected by laser irradiation with the settings in this study. However, most of the laser treatments still demonstrated slightly lower flexural strength values compared with the control group. No changes in crystalline structure were detected after laser treatment with X-ray Diffraction (XRD) technique. Resin to zirconia shear bond strength was significantly increased after surface coatings. Without surface treatment the bonding between resin and zirconia was susceptible to artificial aging effects. Zirconia and silica-coating groups demonstrated the highest resistance to hydrolytic influence. On the other hand, the chemical changes of zirconia surface were still in need of clarification. It was concluded that porcelain zirconia bonding could be effectively enhanced by applying both sandblasting and a new laser irradiation approach. Laser irradiation might be a potential approach as a surface treatment for improving the quality of porcelain zirconia bonding interface. The strong and reliable resin zirconia integration could not be achieved without appropriate surface pre-treatment. This coating treatment is a promising approach for strengthening resin to zirconia adhesion. DOI: 10.5353/th_b5223979 Subjects: Zirconium oxide Dental materials
Book Synopsis Shear Bond Strength Of Zirconia by : Deepak Thomas
Download or read book Shear Bond Strength Of Zirconia written by Deepak Thomas and published by LAP Lambert Academic Publishing. This book was released on 2014-06-18 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book evaluated the shear bond strength of zirconia bonded to dentin specimens using a self etch dual cure resin cement after various surface treatments of zirconia. Twenty zirconia rods (3 9 2.5 mm) were prepared from zirconia blocks and assigned into 5 groups for the following surface treatments. (1) Group I: Control (C) no treatment (2) Group II: airborne-particle abrasion (APA), (3) Group III: hydrofluoric acid etching (HF), (4) Group IV: hydrofluoric acid etching followed by silanation (HF/S), and (5) Group V: application of zirconia primer(Z). Dentin Specimens were prepared from extracted molars stored in 0.5% chloramine-T. Zirconia rods were bonded to dentin using resin cement (Multilink Speed), then light polymerized. The specimens tested for failure were tested using the notched shear bond test method in a universal loading apparatus. One way ANOVA followed by Tukey HSD for cell means were used to analyze the data(=0.05). The highest values were obtained with group V (Z) (8.66 MPa) followed by group II (APA) (6.71 MPa), and group IV (HF/S) (4.41 MPa). The least values were obtained for group III (HF) (3.88 MPa) with no significant difference (P value 0.53) between grou
Book Synopsis Biomaterials In asia by : Mingqiang Li
Download or read book Biomaterials In asia written by Mingqiang Li and published by Frontiers Media SA. This book was released on 2023-02-24 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Exploring the Role of Zirconia Surface Treatments on the Properties and the Material's Bonding to Resin Cement by : Mahmood Abu Ruja'
Download or read book Exploring the Role of Zirconia Surface Treatments on the Properties and the Material's Bonding to Resin Cement written by Mahmood Abu Ruja' and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Objectives: 1. To evaluate the bond strength of yttria-tetragonal zirconia polycrystalline (Y-TZP), lithium-disilicate, and feldspathic ceramics to 10-methacryloyloxydecyl dihydrogen phosphate (MDP)-containing and non-MDP resin cements. 2. To evaluate the effect of ultrashort-pulse laser (UPL) on surface treatment on Y-TZP surface properties, the material's bond strength to resin cement, and the effect of thermal stress on bond strength. Methods: Lithium-disilicate (LD), feldspathic porcelain (FP), and Y-TZP blocks received surface treatment according to the manufacturer recommendations (LD and FP: hydrofluoric acid, Y-TZP: alumina-blasting), and were luted to human dentin using MDP-containing (UL) or non-MDP adhesive system (UN). Specimens were microtensile tested. Fully-sintered Y-TZP received either no treatment (CTL) or one treatment of: ALB, SIL, or UPL. UPL consisted of either dots (LSD) or lines (LSL) patterns. Surface roughness, contact angle, and crystalline phases were evaluated. Y-TZP were cemented to composite using resin-based cement combined with a silane and MDP-containing adhesive. Specimens were incubated for 48 hours, then microtensile tested directly or after thermocycling. Results: The type of ceramic and the resin cement both had significant effects on bond strength (P≤.001). Y-TZP showed significantly lower bond strength (p.
Book Synopsis Influence of Phosphoric Acid Surface Treatment on Shear Bond Strength Durability of Resin Cement to Zirconia-base Ceramic Conditioned with Different Primers by : Eman Zuhair Alshehri
Download or read book Influence of Phosphoric Acid Surface Treatment on Shear Bond Strength Durability of Resin Cement to Zirconia-base Ceramic Conditioned with Different Primers written by Eman Zuhair Alshehri and published by . This book was released on 2015 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: BACKGROUND: Phosphoric acid treatment has been reported to be relevant for zirconia cleaning after contamination. However, its interaction with different primers is not well known and needs to be investigated. OBJECTIVES: To compare the shear bond strengths (SBS) of resin cement to Y-TZP after phosphoric acid pretreatment and different chemical conditioning protocols, and to test the durability of SBSs after long term storage and thermal cycling conditions. To investigate the effect of phosphoric acid 75 on the surface roughness of a yttrium-stabilized tetragonal zirconia polycrystal ceramic (Y-TZP). METHODS: Sixty bars of zirconia (30 X 5 X 2 mm) were polished and glued to acrylic tubes. Each bar received 3 different surface treatments (control, phosphoric acid and air-abrasion). The bars were randomly assigned into five groups according to different primers applied (No primer, Clearfil ceramic primer, Monobond Plus, Z-prime plus and AZ primer). After that, resin cement was mixed, injected into a mold, and light cured. The specimens were tested in shear on a universal testing machine. Half of the specimens were tested after 24 h water storage and the other half were tested after 90 days of water storage and thermocycling. Non-contact profilometer was used to assess the effect of the three surface pretreatments on surface roughness of zirconia. Mode of failure and surface roughness were evaluated with SEM. Statistical analyses were conducted with mixed-model ANOVA and chi-square tests. RESULTS: The results indicated that Monobond Plus primer showed higher SBS after phosphoric acid treatment compared to other primers used. SBS of all air abrasion groups were higher than phosphoric acid groups. Long term water storage and thermocycling led to a statistically significant decrease in SBS for all groups except Monobond Plus, Z-prime plus and AZ primer after air abrasion treatment. Surface roughness measurements showed no significant differences among the surface treatments. CONCLUSION: Monobond Plus provided the highest SBS to zirconia after phosphoric acid treatment. The findings suggest that the air abrasion is the best surface treatment after contamination of zirconia surface. Monobond Plus, Z-prime plus and AZ primer showed durable SBS after air abrasion treatment and aging process.
Book Synopsis Science and Technology of Zirconia V by : M., Bannister
Download or read book Science and Technology of Zirconia V written by M., Bannister and published by CRC Press. This book was released on 2023-05-09 with total page 881 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is based on the Fifth International Conference that was held on 16-21 August, 1992 in Melbourne, Australia, in conjunction with AUSTCERAM 92. It demonstrates that the field of Zirconia ceramics remains one of scientific challenge and technical attraction.
Book Synopsis Science and Technology of Zirconia V by : M., Bannister
Download or read book Science and Technology of Zirconia V written by M., Bannister and published by CRC Press. This book was released on 1993-09-27 with total page 890 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zirconia V drew 122 contributions from 19 countries. The papers provide an up-to-date picture of zirconia research and development around the world. There is still considerable interest in the theory and practice of transformation toughening together with the application of zirconia toughening to increasingly more complex composite systems. They also reflect a prominent development of recent years, the resurgence of international interst in the zirconia-based solid oxide fuel cell.
Book Synopsis Effect of Zirconia Surface Treatments on the Shear Strength of Zirconia/veneering Ceramic Composites by : Philipp Alfred Charles Grohmann
Download or read book Effect of Zirconia Surface Treatments on the Shear Strength of Zirconia/veneering Ceramic Composites written by Philipp Alfred Charles Grohmann and published by . This book was released on 2008 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sturdevant's Art & Science of Operative Dentistry - E-Book by : Andre V. Ritter
Download or read book Sturdevant's Art & Science of Operative Dentistry - E-Book written by Andre V. Ritter and published by Elsevier Health Sciences. This book was released on 2017-12-20 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Get a better picture of operative dentistry from the most complete text on the market. Using a heavily illustrated, step-by-step approach, Sturdevant’s Art and Science of Operative Dentistry, 7th Edition helps you master the fundamentals and procedures of restorative and preventive dentistry and learn to make informed decisions to solve patient needs. Drawing from both theory and practice and supported by extensive clinical and laboratory research, this new full-color edition features four new chapters and updated information in the areas of color and shade matching, light curing, periodontology, digital dentistry and more. It’s the practicing dentist’s complete guide to all aspects of operative dentistry. Four new chapters cover the areas of color and shade matching, light curing, periodontology, and digital dentistry. Expert Consult website with five supplemental chapters and procedure videos. Evidence-based approach is supported by extensive clinical and laboratory research. Comprehensive coverage provides a thorough understanding of caries and an authoritative approach to its treatment and prevention. Illustrated step-by-step approach offers a better picture of conservative restorative and preventive dentistry. Full color design clearly demonstrates techniques and details. NEW! Four new chapters cover the areas of color and shade matching, light curing, periodontology, and digital dentistry. NEW! Expert Consult website includes five additional online-only chapters, procedure videos, and references linked to PubMed. NEW! Updated content throughout integrates new knowledge that has emerged since publication of the previous edition.
Download or read book Metals Abstracts Index written by and published by . This book was released on 1996 with total page 1622 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Science and Technology of Zirconia II by : Manfred Rühle
Download or read book Science and Technology of Zirconia II written by Manfred Rühle and published by . This book was released on 1984 with total page 866 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineered Materials Abstracts written by and published by . This book was released on 1995 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Surface Finish After Green Machining on Flexural Strength of 3Y-TZP by : James Robert Schmidt
Download or read book Effect of Surface Finish After Green Machining on Flexural Strength of 3Y-TZP written by James Robert Schmidt and published by . This book was released on 2007 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: An increasingly popular type of ceramic utilized in machined dental restorations is tetragonal zirconia polycrystals stabilized with 3 mol% yttria (3Y-TZP). The superior physical properties of 3Y-TZP can be attributed to the material's ability to undergo phase transformation. Transformation toughening produces internal compressive stresses that work against the further propagation of internal cracks and other intrinsic flaws. The outstanding mechanical properties of the sintered 3Y-TZP make it suitable for both single and short span multiple unit restorations in the molar region. The unfortunate downside to the outstanding mechanical properties of sintered 3Y-TZP is that the metastability of zirconia greatly reduces the material's machinability in the fully sintered state. Machining in the pre-sintered state, however, allows complex shapes to be fabricated easily, accurately, and quickly. In spite of the increased machinability associated with the softened pre-sintered state, the intrinsic brittle nature of ceramics may still make them susceptible to the development of surface flaws and microcracking. It is imperative to investigate the types of flaws that may be induced by the milling process as well as their influence on the overall reliability and strength of the material. The purpose of this study was to evaluate the effect of surface finish prior to sintering on the flexural strength and reliability of 3Y-TZP. One hundred forty discs were fabricated and randomly divided into seven groups of twenty. For each group, a different surface treatment was applied: (1.) polishing (4000 grit), (2.) roughening (1200 grit), (3.) roughening (600grit), (4.) roughening (600grit) & slurry immersion, (5.) indenting (1.9N), (6.) indenting (4.9N) and (7.) as-cut. The relative amounts of monoclinic and tetragonal zirconia were evaluated using x-ray diffraction. Biaxial flexural strength was determined and data was analyzed by ANOVA and Tukey's test (p
Book Synopsis Effects of Two Surface Treatments on Bonding to Zirconia by : Eva Niu
Download or read book Effects of Two Surface Treatments on Bonding to Zirconia written by Eva Niu and published by . This book was released on 2009 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
