Influence Of Orthodontic Bracket Bonding Protocol On Zirconia Ceramics And Resulting Bond Strength Adhesive Remnant And Debonded Polished Zirconia Surface Roughness

Download Influence Of Orthodontic Bracket Bonding Protocol On Zirconia Ceramics And Resulting Bond Strength Adhesive Remnant And Debonded Polished Zirconia Surface Roughness full books in PDF, epub, and Kindle. Read online Influence Of Orthodontic Bracket Bonding Protocol On Zirconia Ceramics And Resulting Bond Strength Adhesive Remnant And Debonded Polished Zirconia Surface Roughness ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!

Influence of Orthodontic Bracket Bonding Protocol on Zirconia Ceramics and Resulting Bond Strength, Adhesive Remnant, and Debonded-Polished Zirconia Surface Roughness

Author : Kaylee Anne Bergman
Publisher :
ISBN 13 :
Total Pages : 46 pages
Book Rating : 4.:/5 (113 download)

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Book Synopsis Influence of Orthodontic Bracket Bonding Protocol on Zirconia Ceramics and Resulting Bond Strength, Adhesive Remnant, and Debonded-Polished Zirconia Surface Roughness by : Kaylee Anne Bergman

Download or read book Influence of Orthodontic Bracket Bonding Protocol on Zirconia Ceramics and Resulting Bond Strength, Adhesive Remnant, and Debonded-Polished Zirconia Surface Roughness written by Kaylee Anne Bergman and published by . This book was released on 2019 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Objective: This study evaluated the effect of primer protocol for metal orthodontic brackets bonded to zirconia ceramic and resulting shear bond strength (SBS), adhesive remnant index (ARI), and debonded and polished zirconia surface roughness. Methods: Zirconia specimens were milled, glazed, embedded in acrylic resin and the target area microetched with aluminum oxide. Glazed and microetched representative specimens were evaluated with energy dispersive spectroscopy (EDS). Specimens were randomly assigned to primer protocol, enamel (TransbondTM Plus Self-Etching Primer) or zirconia (Assure® Plus), and primed according to manufacturer instructions. Metal orthodontic brackets were bonded to the primed surface with resin adhesive (Transbond XTTM) and light cured. To simulate intraoral conditions, all primer and bonding protocols took place in an environmental chamber set at 33±2°C and 75±5% humidity followed by a 24-hour dark cure at 37 C. Following SBS testing, an ARI value was assigned to debonded brackets. Residual adhesive was removed from the debonded zirconia specimens, the zirconia surface polished, and surface roughness measured using a profilometer. Scanning electron microscopy (SEM) was performed for qualitative evaluation of the zirconia surface. Results: Zirconia substructure exposure by aluminum oxide microetching was verified with EDS. A significantly lower (p

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

Author : Dan Liu
Publisher :
ISBN 13 : 9781361353905
Total Pages : pages
Book Rating : 4.3/5 (539 download)

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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

The Effect of Surface Preparation on the Shear Bond Strength of Orthodontic Brackets Bonded to Zirconia

Author :
Publisher :
ISBN 13 :
Total Pages : 70 pages
Book Rating : 4.:/5 (928 download)

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Book Synopsis The Effect of Surface Preparation on the Shear Bond Strength of Orthodontic Brackets Bonded to Zirconia by :

Download or read book The Effect of Surface Preparation on the Shear Bond Strength of Orthodontic Brackets Bonded to Zirconia written by and published by . This book was released on 2015 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Debonding and Fixed Retention in Orthodontics

Author : Theodore Eliades
Publisher : John Wiley & Sons
ISBN 13 : 1119623952
Total Pages : 341 pages
Book Rating : 4.1/5 (196 download)

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Book Synopsis Debonding and Fixed Retention in Orthodontics by : Theodore Eliades

Download or read book Debonding and Fixed Retention in Orthodontics written by Theodore Eliades and published by John Wiley & Sons. This book was released on 2023-10-16 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: Debonding and Fixed Retention in Orthodontics An accessible and thorough guide to debonding and fixed retainer bonding Debonding and Fixed Retention in Orthodontics: An Evidence-Based Clinical Guide reviews the protocols, materials, and techniques required at two key stages of orthodontic treatment. The book has been written as a reference guide and the chapters introduce the best-supported and most efficient approaches to each stage of debonding and fixed retainer bonding treatments, from choice of material through to final results. The book includes relevant procedures including orthodontic appliance removal, appliance debonding, the use of rotating instruments, and enamel cleaning. The authors also provide guidance on topics such as the failure and adverse effects of fixed retainers, enamel structural defects, periodontal effects, and aerosol production, to aid in positive result retention. Readers will also find: Two extensive sections covering debonding and fixed retainer bonding Evidence-based guidelines for each stage of treatment Summaries of the side effects of procedures on hard and soft dental tissues Tips to avoid potential unfavorable sequelae Detailed lists of existing methods and their clinical implications Debonding and Fixed Retention in Orthodontics is written for orthodontic specialists, clinicians, and postgraduate dental students looking to build knowledge and ensure the best results during these two stages of orthodontic therapy.

Effect of Surface Treatments on Resin-Zirconia Bonding

Author : Fung Yan
Publisher :
ISBN 13 : 9781361026229
Total Pages : pages
Book Rating : 4.0/5 (262 download)

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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

Influence of Phosphoric Acid Surface Treatment on Shear Bond Strength Durability of Resin Cement to Zirconia-base Ceramic Conditioned with Different Primers

Download Influence of Phosphoric Acid Surface Treatment on Shear Bond Strength Durability of Resin Cement to Zirconia-base Ceramic Conditioned with Different Primers PDF Online Free

Author : Eman Zuhair Alshehri
Publisher :
ISBN 13 :
Total Pages : 75 pages
Book Rating : 4.:/5 (923 download)

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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.

Determining the Effect of Primekote Bracket Conditioner on Orthodontic Bond Strength

Author : Gary L. Jennings
Publisher :
ISBN 13 :
Total Pages : 50 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Determining the Effect of Primekote Bracket Conditioner on Orthodontic Bond Strength by : Gary L. Jennings

Download or read book Determining the Effect of Primekote Bracket Conditioner on Orthodontic Bond Strength written by Gary L. Jennings and published by . This book was released on 1999 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Best Way to Bond Orthodontic Brackets to Composite Restoration

Author : Hasan Sabah
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659817267
Total Pages : 136 pages
Book Rating : 4.8/5 (172 download)

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Book Synopsis The Best Way to Bond Orthodontic Brackets to Composite Restoration by : Hasan Sabah

Download or read book The Best Way to Bond Orthodontic Brackets to Composite Restoration written by Hasan Sabah and published by LAP Lambert Academic Publishing. This book was released on 2015-12-23 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct bonding of orthodontic attachment has removed some of the esthetic concerns many adults previously had when considering orthodontic therapy. With an increase in adult treatment comes the challenge of direct bonding to non-enamel surface, such as composite restoration. The big problem that faces orthodontist is debonding of the brackets specially in cases when it fixed on restoration like composite. Therefore a roughened surface will need in order to bond the adhesive composite material to the substrate composite restoration, this roughness will lead to distraction, weaken and loss of integrity of the composite restoration. This study was designed to evaluate the bonding strength of three different generations of adhesive bonding and which one is better to use for bonding the orthodontic bracket to composite restoration, without doing any roughness on composite restoration surface and compare between them which one have better bonding strength with composite restoration.

Shear Bond Strength of Ceramic Brackets to Zirconia Conditioned with Various Primer-Adhesive Systems

Author : Gina M. Domm
Publisher :
ISBN 13 :
Total Pages : 61 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis Shear Bond Strength of Ceramic Brackets to Zirconia Conditioned with Various Primer-Adhesive Systems by : Gina M. Domm

Download or read book Shear Bond Strength of Ceramic Brackets to Zirconia Conditioned with Various Primer-Adhesive Systems written by Gina M. Domm and published by . This book was released on 2017 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Bond Strength In Orthodontics

Author : Rahamath Ulla Khan
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659154546
Total Pages : 64 pages
Book Rating : 4.1/5 (545 download)

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Book Synopsis Bond Strength In Orthodontics by : Rahamath Ulla Khan

Download or read book Bond Strength In Orthodontics written by Rahamath Ulla Khan and published by LAP Lambert Academic Publishing. This book was released on 2014-03-06 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Demineralization of enamel has been one of the iatrogenic effects of fixed orthodontic therapy, for which various authors have suggested the use of fluoride to reduce the decalcification and development of white spot lesion. In the present study, the shear bond strength of light-cure composite adhesive, self-cure composite adhesive, light-cure glass ionomer cement and acidic primer were tested at the end of 24 hours after bonding. The results proved that the acidic primer system had highest shear bond strength while Light-cure glass ionomer system had the least shear bond strength. But the mean values met the minimal shear bond strength required for orthodontic bonding. After bond failure, least amount of glass ionomer cement was present on the enamel surface, followed by acidic primer system, light-cure composite and self-cure composite system. So, it is advantageous to use light-cure glass ionomer cement for bonding in terms of less amount of time spent and no enamel damage during cleaning procedure after debonding.

Clinical Trial of Orthodontic Bonding Agents

Author : Andrew Tringas
Publisher :
ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Clinical Trial of Orthodontic Bonding Agents by : Andrew Tringas

Download or read book Clinical Trial of Orthodontic Bonding Agents written by Andrew Tringas and published by . This book was released on 1998 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Effect of Delayed Polymerization Time and Bracket Manipulation on Orthodontic Bracket Bonding

Author : Michael J. Ponikvar
Publisher :
ISBN 13 :
Total Pages : 54 pages
Book Rating : 4.:/5 (911 download)

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Book Synopsis Effect of Delayed Polymerization Time and Bracket Manipulation on Orthodontic Bracket Bonding by : Michael J. Ponikvar

Download or read book Effect of Delayed Polymerization Time and Bracket Manipulation on Orthodontic Bracket Bonding written by Michael J. Ponikvar and published by . This book was released on 2014 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examined the effect of bracket manipulation in combination with delayed polymerization times on orthodontic bracket shear bond strength and degree of resin composite conversion. Orthodontics brackets were bonded to extracted third molars in a simulated oral environment after a set period of delayed polymerization time and bracket manipulation. After curing the bracket adhesive, each bracket underwent shear bond strength testing followed by micro-Raman spectroscopy analysis to measure the degree of conversion of the resin composite. Results demonstrated the shear bond strength and the degree of conversion of ceramic brackets did not vary over time. However, with stainless steel brackets there was a significant effect (p ≤ 0.05) of delay time on shear bond strength between the 0.5 min and 10 min bracket groups. In addition, stainless steel brackets showed significant differences related to degree of conversion over time between the 0.5 min and 5 min groups, in addition to the 0.5 min and 10 min groups. This investigation suggests that delaying bracket adhesive polymerization up to a period of 10 min then adjusting the orthodontic bracket may increase both shear bond strength and degree of conversion of stainless steel brackets while having no effect on ceramic brackets.

Influence of Saliva Contamination on Resin Bond Durability to Zirconia - Effect of Cleaning Methods

Author : Dhara Patel
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (927 download)

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Book Synopsis Influence of Saliva Contamination on Resin Bond Durability to Zirconia - Effect of Cleaning Methods by : Dhara Patel

Download or read book Influence of Saliva Contamination on Resin Bond Durability to Zirconia - Effect of Cleaning Methods written by Dhara Patel and published by . This book was released on 2015 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Background and Rationale: As compared with glass-based ceramics, zirconia has gained considerable popularity in restorative dentistry due to its superior mechanical properties. Clinically, however, zirconia ceramics pose a significant challenge regarding the achievement of a reliable and durable bond to resin-based cements. Thus far, it has been established that zirconia bond to resin-based cements can be enhanced after different surface conditioning methods, such as airborne particle abrasion with aluminum oxide particles. Meanwhile, another major issue pertaining to bonding of ceramic restorations is related to its potential contamination before cementation. Briefly, after sandblasting and clinical try-in procedures, zirconia can be contaminated with saliva and/or blood. As with many metals, zirconium shows a strong affinity towards the phosphate group found in saliva and other fluids, which reacts with the zirconia surface and makes bonding very difficult. Recently, a new cleaning agent called Ivoclean (Ivoclar-Vivadent), which is an alkaline suspension of zirconium oxide particles, has been introduced in the market to remove contamination from zirconia in an effort to improve bonding to resin cements. Objective: The purpose of this study was to evaluate the influence of saliva contamination and the effect of several cleaning methods, including Ivoclean on resin bond strength to zirconia. Materials and Methods: Eighty square-shaped specimens (phi = 12 mm x 12 mm x 3 mm) of yttria-stabilized full-contour zirconia (Diazir, Ivoclar-Vivadent, Amherst, NY) were sectioned from zirconia blocks using a water-cooled diamond blade. Then, these specimens were embedded in acrylic resin, and their surfaces gradually finished with silicon carbide papers (600 grit to 1200 grit). The prepared zirconia surfaces were sandblasted with 50-microm aluminum oxide particles for 15 s, under 2.5 bars and from distance of 10 mm. After sandblasting the specimens were cleaned in an ultrasonic bath containing distilled water for 5 min and air-dried for 10s. All samples were equally divided into 4 groups (n = 20) according to the cleaning method. Airborne particle abraded specimens without contamination was served as the control group. Remaining groups were contaminated with saliva, and subjected to different cleaning protocols, namely: Ivoclean, 70% isopropanol, and no treatment. Two resin cement buttons (Multilink - Ivoclar-Vivadent, Amherst, NY) were built over each zirconia surface and light-cured following the manufacturer recommendations. The influence of contamination and surface cleaning methods on ceramic bond durability were examined after 24 h on half of the samples in each group (n = 10, n = 20), and the other half (n = 10, n = 20) specimens will undergo 6000 thermocycles (TC) before shear bond testing in the universal testing machine. Conclusion of Expected Outcomes: The shear bond strength of resin cement to zirconia led to a significant improvement after cleaning with Ivoclean both immediately and after thermal aging.

Micromechanical Retention and Chemical Bonding to Polycrystalline Dental Ceramics

Author : Evaggelia Papia
Publisher :
ISBN 13 : 9789171045393
Total Pages : 110 pages
Book Rating : 4.0/5 (453 download)

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Book Synopsis Micromechanical Retention and Chemical Bonding to Polycrystalline Dental Ceramics by : Evaggelia Papia

Download or read book Micromechanical Retention and Chemical Bonding to Polycrystalline Dental Ceramics written by Evaggelia Papia and published by . This book was released on 2014 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Researchers are constantly developing new dental materials to replace missing teeth. One material group receiving major focus is ceramic materials; more specifically, oxide ceramics; and, in particular, yttrium dioxide-stabilized tetragonal polycrystalline zirconium dioxide (Y-TZP). In addition, one of the major challenges is to ensure retention of oxide ceramic-based restoration in the mouth, in a tissue preserving way. Success in traditional cementation of dental restorations relies on a geometric form that establishes the macromechanical retention, the surface structure of the dental restoration, the tooth substance (micromechanical retention) and the cement itself. In clinical situations when macromechanical retention is insufficient, it may be necessary to use an adhesive cementation technique. Reliable adhesive bonding between the restoration, the cement, and the tooth substance requires micromechanical retention and cement that achieves chemical retention. In oxide ceramics, chemical retention has been difficult to achieve and unpredictable. Various techniques have been proposed for modifying the surface of oxide ceramic-based restorations making adhesive cementation technique a possible treatment option. The overall aim of this thesis is to evaluate and develop techniques for modifying the surface of oxide ceramics that enable durable bonding between the restorations and adhesive cement systems. Additionally, the thesis will inventory existing methods for achieving a bondable surface on oxide ceramics and how these methods affect the materials. ... Together, the results of this thesis demonstrate that different surface treatments/modifications of oxide ceramics increase the bond strength between ceramics and adhesive cement systems. Surface modification with a glass medium was particularly effective. All surface treatment, however, affects the material properties and the resulting dental restoration. Choice of surface treatment should be made based on the restoration materials: the oxide ceramics and the adhesive cement systems.

Orthodontic Brackets

Author : Haris Khan
Publisher : CreateSpace
ISBN 13 : 9781508936275
Total Pages : 284 pages
Book Rating : 4.9/5 (362 download)

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Book Synopsis Orthodontic Brackets by : Haris Khan

Download or read book Orthodontic Brackets written by Haris Khan and published by CreateSpace. This book was released on 2015-03-18 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book was authored to cater for all aspects of orthodontic brackets. The focus being to provide students with real time pictures of different brackets available in the market and to determine their behaviour in oral cavity and their appearance after debonding. The main emphasis being on three vital aspects viz; the selection, placement and debonding, this book has accordingly been designed to comprise these three sections. Real times of new and used brackets have been specifically included to provide the students a realistic insight of brackets.Care has been taken to ensure correlation of clinical situation and various bracket selection criterion

The Effect of Polishing Protocols on the Surface Roughness of Zirconium Oxide

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (116 download)

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Book Synopsis The Effect of Polishing Protocols on the Surface Roughness of Zirconium Oxide by :

Download or read book The Effect of Polishing Protocols on the Surface Roughness of Zirconium Oxide written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Background.Custom-made CAD-CAM abutments made from zirconium oxide must undergo certain processing of the surface in a dentallaboratory. However, the end point of polishing is defined subjectively u2018until mirror-like surfaceu2019 by a dental technician and the actualsurface roughness remains unknown. For comparison, stock abutments are manufactured to have surface roughness Ra of around200nm. Moreover, scientific material on achieving predetermined surface roughness of zirconium abutments is scarce.Aim. To evaluate the surface roughness of zirconium oxide samples that undergo gradual polishing using commercially available polishingsystem and polishing paste. Furthermore, it was aimed to confine scientific based practical implications for zirconia polishing.Materials and Methods. 50 rectangular specimens of predetermined size (10x10x3mm) were sintered from zirconium oxide (Lava Classic 3M ESPE)according to manufactureru2019s instructions. Samples were randomly assigned to one of the 5 groups (n=10): Ctrl (control), Co (coarse),F (fine), SF (superfine) and PP (polishing paste). In the Ctrl group no polishing was done. Other specimens were processed using NTICeraGlaze (Kerr) polisher system consisting of coarse green polisher (P301) for pre-polishing, fine blue polisher (P3001) for refiningand superfine yellow polisher (P30001) for reglaze-high shine. Green CeraGlaze was used for group Co. Specimens of F groupunderwent processing with green CeraGlaze plus blue CeraGlaze. Yellow CeraGlaze in addition was used for samples in SF group.Finally, besides CeraGlaze instruments, Zirkopol (Feguramed) diamond polishing paste were used for PP group. Optical profilometer(Sensofar PLu 2300) was used to evaluate surface roughness Ra in nanometers (nm).Resultats. Surface roughness gradually decreased with further polishing through the groups: Ctrl - 525 (SD 99) nm, Co 252 (SD 38) nm, F - 196(SD 35) nm, SF - 114 (SD 31) nm, PP - 54 (SD 20) nm. Statistically significant differences were detected between all groups (p

The Shear Bond Strength of Orthodontic Bracket Base Shapes to Human Enamel, an in Vitro Study

Author : Ziana Esmail
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (135 download)

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Book Synopsis The Shear Bond Strength of Orthodontic Bracket Base Shapes to Human Enamel, an in Vitro Study by : Ziana Esmail

Download or read book The Shear Bond Strength of Orthodontic Bracket Base Shapes to Human Enamel, an in Vitro Study written by Ziana Esmail and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction: There is a growing demand for esthetic appliances during orthodontic treatment, with a specific interest in WildSmiles shaped brackets amongst children and adolescents. Bond failure of brackets over the course of orthodontic treatment can result in increased treatment time, increased overhead costs, and feelings of frustration for the patient and practitioner. Objective: The purpose of this study was to the evaluate the effect of orthodontic bracket base shape on shear bond strength (SBS) to human enamel, in vitro, at two time points, as well as the nature of debonding fractures using the Adhesive Remnant Index (ARI). Methods: Orthodontic brackets with different shaped bases (flower, heart, rectangular) were bonded to 120 extracted human third molars. SBS was measured using a Servohydraulic Test System at 24 hours and 2 months after initial bonding. ARI scores were evaluated under 10x magnification to assess the amount of resin left on the tooth. Results: The control bracket with a rectangular base shape had the highest mean SBS (26.78 ± 8.19 MPa), and significantly differed from flower (17.19 ± 4.45 MPa) and heart (18.86 ± 3.50 MPa) base shapes (p 0.001). The mean SBS of flower and heart shaped brackets did not differ considerably from each other (p 0.05). The mean SBS between debond times at 24 hours (21.50 ± 7.46 MPa) and 2 months (20.38 ± 6.69 MPa) were not statistically significant (p > 0.05). Analysis of ARI scores showed a significant difference between Flower-24 hours vs Heart- 2 months (p=0.039), Flower-24 hours vs Heart- 24 hours (p=0.004), and Control-2 months vs Heart-24 hours (p=0.015). The heart shaped bracket had a greater proportion of adhesive bond failures at the enamel-resin interface. Conclusion: Bracket base shape has an effect on SBS, with the rectangular base shape having a higher mean SBS compared to flower and heart base shapes. All bracket shapes had bond strengths above the clinically acceptable range of 6-8 MPa, and thus may provide adequate SBS in a clinical situation. Variations in ARI scores occurred based on bracket shape and were of a mixed adhesive-cohesive nature.