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Book Effect of Surface Treatments on the Shear Bond Strengh of Porcelain

Download or read book Effect of Surface Treatments on the Shear Bond Strengh of Porcelain written by Shika Gupta and published by . This book was released on 2001 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Influence of Surface Treatment on Veneering Porcelain Shear Bond Strength to Zirconia After Cyclic Loading

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 Effect of Different Surface Treatments on the Shear Bond Strength of Lithium Disilicate Ceramic

Download or read book Effect of Different Surface Treatments on the Shear Bond Strength of Lithium Disilicate Ceramic written by Mai Almujel and published by . This book was released on 2013 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Statement of problem: During clinical try-in, it is almost inevitable that the fitting surfaces of a lithium disilicate ceramic fixed prosthesis be contaminated with saliva and silicone disclosing medium. Purpose: This in vitro study used a shear bond strength (SBS) test to evaluate the effect of saliva and silicone disclosing medium contamination on the adhesive luting material bond to porcelain, and the effectiveness of various materials used to remove such contamination. Hypothesis: The resin-ceramic bond strength and its durability are related to ceramic surface contamination and subsequent surface treatment. Material and methods: Ninety ceramic specimens were milled from lithium disilicate blocks using an electrical high precision saw, crystallized, and then randomly assigned into six groups (n=15). Excluding the control group, each group underwent contamination with saliva and silicon disclosing medium, then received a different surface cleaning treatment. After bonding and thermocycling, shear bond strength values were measured on an Instron machine. Fracture modes were determined by examination with a scanning electron microscope. Results: Salivary contamination of porcelain surfaces significantly reduced the resin cement-to-porcelain bond compared to the control (P

Book Science and Technology of Zirconia II

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:

Book Effect of Porcelain Surface Pretreatments on Composite Resin porcelain Shear Bond Strength

Download or read book Effect of Porcelain Surface Pretreatments on Composite Resin porcelain Shear Bond Strength written by Harvey Hamilton Breckner and published by . This book was released on 1991 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Twenty four Hour and Six Month Evaluation of Porcelain Surface Preparation and Orthodontic Bond Strength

Download or read book Twenty four Hour and Six Month Evaluation of Porcelain Surface Preparation and Orthodontic Bond Strength written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Bonding orthodontic attachments to porcelain can be challenging. The purpose of this study was to investigate the 24 hour and 6 month shear bond strengths of orthodontic buttons bonded to porcelain using six different surface preparations: (1) Pumice polish for 5 seconds and 37% phosphoric acid etch with or (2) without the use of a silane primer, (3) microabrasion with 90[mu] aluminum oxide for 5 seconds with or (4) without the use of a silane primer and (5) hydrofluoric acid etch for 120 seconds with or (6) without the use of a silane primer. For each of the six experimental surface treatment groups, two orthodontic buttons were bonded to each of ten flat porcelain surfaces. The bonded test assemblies were shear tested to failure after 24 hour and 6 month storage at 37C and 100% R.H. The shear bond strengths were calculated and analysed using the single ANOVA and Tukey's multiple comparison test. When compared to 24 hour results, the samples treated with microabrasion and silane, hydrofluoric etch and silane and hydrofluoric etch alone underwent no significant reduction in mean bond strength (p> 0.05). The samples treated with microabrasion and silane, microabrasion alone and pumice polish alone underwent significant reductions in mean bond strength (p

Book The Effects of Five Surface Treatments on the Shear Bond Strength of Procera All ceram and Vita In ceram Core Material

Download or read book The Effects of Five Surface Treatments on the Shear Bond Strength of Procera All ceram and Vita In ceram Core Material written by Fidel Jose Torres and published by . This book was released on 2002 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Some Surface Treatments for Improving the Durability of Zirconia Based Restorations

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 Issues in Dentistry Oral Health Odontology and Craniofacial Research 2011 Edition

Download or read book Issues in Dentistry Oral Health Odontology and Craniofacial Research 2011 Edition written by and published by ScholarlyEditions. This book was released on 2012-01-09 with total page 2700 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Dentistry, Oral Health, Odontology, and Craniofacial Research: 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Dentistry, Oral Health, Odontology, and Craniofacial Research. The editors have built Issues in Dentistry, Oral Health, Odontology, and Craniofacial Research: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Dentistry, Oral Health, Odontology, and Craniofacial Research in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Dentistry, Oral Health, Odontology, and Craniofacial Research: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.

Book Restorative Dentistry E Book

Download or read book Restorative Dentistry E Book written by Italian Ac and published by Elsevier Health Sciences. This book was released on 2013-12-01 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: With more than 2,080 vibrant, full-color clinical photographs, Restorative Dentistry presents the Italian Academy of Conservative Dentistry's authoritative coverage of endodontics, cosmetics, prosthodontics, traumatology, and general operative principles with unparalleled visual detail. This atlas-style resource guides you step-by-step through essential procedures and presents realistic case scenarios to help you deepen your understanding of restorative principles and successfully apply your knowledge to patient treatment. More than 2,200 world-class photographs provide rich clinical detail to enhance your understanding of commonly encountered conditions. Step-by-step procedures in each chapter are integrated with interesting case studies to clarify techniques and help you confidently apply concepts in the clinical setting. Summary boxes provide fast access to key chapter content. Clinical approach reflects the trusted expertise of the Accademia Italiana di Conservativa (Italian Academy of Conservative Dentistry) and familiarizes you with the latest scientific research and treatment techniques.

Book Effects of Etching Duration on the Surface Roughness Surface Loss Flexural Strength and Shear Bond Strength to a Resin Cement of E max Cad Glass Ceramic

Download or read book Effects of Etching Duration on the Surface Roughness Surface Loss Flexural Strength and Shear Bond Strength to a Resin Cement of E max Cad Glass Ceramic written by Hanan Al-Johani and published by . This book was released on 2017 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: EFFECTS OF ETCHING DURATION ON THE SURFACE ROUGHNESS, SURFACE LOSS, FLEXURAL STRENGTH OF E. MAX CAD GLASS CERAMIC AND SHEAR BOND STRENGTH TO A RESIN CEMENT Background: Long-term retention of ceramic restorations is dependent on the bond strength of the luting resin to both the tooth and porcelain substrates. In order to achieve successful bonding, the surface of the porcelain substrate must be modified to increase the surface roughness, and this can be achieved chemically by hydrofluoric (HF) acid etching. However, prolonged HF acid etching has shown to have a weakening effect on the evaluated lithium disilicate glass-ceramics. Therefore, it is essential to quantify the required etching duration of HF acid to minimize the possible deleterious effects on ceramic strength while maximizing the bond strength to tooth structure. Objectives: To evaluate the effects of HF acid etching duration on the surface roughness, surface loss, flexural strength, and shear bond strength of IPS e.max CAD (Ivoclar Vivadent) lithium disilicate-based glass ceramic to a resin cement. Hypothesis: The differences in HF acid etching durations will not have a significant effect on the surface roughness, surface loss, flexural strength, or shear bond strength of IPS e.max CAD to a resin cement. Methods: 168 specimens were prepared from IPS e.max CAD blocks. All specimens were polished and sonically cleaned in distilled water. Specimens were fired in the vacuum pump furnace according to the manufacturer's instructions. Specimens were then divided into 4 groups, according to etching durations, then further divided into 3 subgroups, according to the properties tested. Group A was not etched (control), Groups B, C and D were etched with 5-percent HF acid (IPS Ceramic Etching gel, Ivoclar Vivadent) for 20 s, 60 s and 90 s respectively. The morphologies of both etched and non-etched surfaces in specimens of subgroup 1 of each etching group (n = 16/group) were observed under scanning electron microscopy (SEM). In addition, non-contact surface profilometry (Proscan 2000) was used to calculate the surface loss and to examine the surface roughness of the etched ceramic surfaces and roughness values (Ra, Rq) were documented for each group. Furthermore, etched specimens of subgroup 2 (n = 16/group) were silanated (Monobond Plus, Ivoclar Vivadent) and cemented with a resin cement (Multilink Automix, Ivoclar Vivadent). The shear bond strength (SBS) was measured using a universal mechanical testing machine. For each etching group, subgroup 3 specimens (n = 10/group) were loaded to failure in a three-point bending test to measure their flexural strength values using a universal mechanical testing machine. Data for surface roughness, surface loss, and flexural strength were analyzed using one-way analysis of variance (ANOVA), to identify the significant effects of different HF acid etching durations. Data for shear bond strength test were analyzed using two-way ANOVA to test the effects of etching duration, storage for 24 hours/thermocycling, and their interaction. All pair-wise comparisons from ANOVA analysis were made using Fisher's Protected Least Significant Differences to control the overall significance level at 5 percent. Results: Difference in HF etching durations did not have a significant effect on surface roughness values Ra or Rq (p = 0.3408; p = 0.3245) respectively, but had a significant effect on surface loss (p = 0.0006). SBS values were not significantly different between experimental groups (p = 0.4650); however, SBS values after 24-h storage were significantly higher than that found after thermocycling (p = 0.0166) among different etching durations. Finally, different HF etching durations did not have a significant effect on flexural strength values (p = 0.1260). Conclusion: Within the limitations of this study, different HF etching durations did not have a significant effect on surface roughness, flexural strength, or shear bond strength of IPS e.max CAD. However, the different etching durations significantly affected the surface loss of the lithium disilicate glass ceramics.

Book Bonding to Ceramics

Download or read book Bonding to Ceramics written by Alvaro Della Bona and published by . This book was released on 2009 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bonding to Ceramics provides students, researchers and clinicians with detailed knowledge of ceramic structures, adhesion mechanisms, quality research design, material selection and clinical performance of dental ceramics. Based on collaborative research efforts and evidence-based clinical data, this book describes the basic properties of ceramics and the applications, failures and limitations of this material. The book features 500 clinical images, many of them in 3D, to aid the understanding of: ceramic microstructures; the basic principles and properties of ceramics; clinical applications and causes of failure. It also discusses the development of experiments to test ceramic designs, how to select the appropriate material according to the specific clinical application, as well as evidence regarding adhesive mechanisms for bonding ceramic restorations. Through examining clinical failures, the book also aims to improve clinical performance through the suggestion of improved materials, structures and designs. The ultimate aim of this book therefore is to provide the reader with the knowledge to be able to select the appropriate ceramic material and bonding technique for each clinical application.