Erscheinungsdatum: 10/2011, Medium: Taschenbuch, Einband: Kartoniert / Broschiert, Titel: Shear Bond Strength of Brackets Adhered to laser-Etch Versus Acid-Etch, Titelzusatz: laser in orthodontic treatment, Autor: Alfaqheri, Hakam // Ghaib, Nidhal // Mehdi, Mohammed, Verlag: LAP Lambert Academic Publishing, Sprache: Englisch, Rubrik: Zahnmedizin // Mund- und Kieferheilkunde, Seiten: 132, Informationen: Paperback, Gewicht: 213 gr, Verkäufer: averdo
Shear Bond Strength of Brackets Adhered to laser-Etch Versus Acid-Etch ab 58.99 € als Taschenbuch: laser in orthodontic treatment. Aus dem Bereich: Bücher, Wissenschaft, Medizin,
Bond Strength of Epiphany Self-Etch Sealer to Dentine ab 67.99 € als Taschenbuch: Effect of Different Irrigation Regimens on the Bond Strength of Epiphany Self-Etch Sealer to Dentine. Aus dem Bereich: Bücher, Wissenschaft, Medizin,
The first section of this work is a review of the literature necessary to understand the objectives of the project, it includes general information about dental adhesive technology as well as adhesion testing, about dentine hybridisation and about the drawbacks of contemporary bonding systems. Several studies revealed excellent immediate and short-term bonding effectiveness of etch-and-rinse adhesives, yet substantial reductions in resindentine bond strength occur after ageing. Degenerative phenomena involve hydrolysis of suboptimally polymerised hydrophilic resin components and degradation of mineral-deprived water-rich resin-sparse collagen matrices by matrix metalloproteinases and cysteine cathepsins.
Acid etching or surface treatment of enamel appear to improve retention by selectively eroding certain hydroxyapatite and facilitating penetration of resin tags and a hybrid layer formation which result in long-term bond strength of adhesive systems. Aim of study: Effect of lasing on shear bond strength (SBS) of flowable composite. Effect of total-etch and self-etch adhesives on shear bond strength (SBS) of flowable composite. Evaluate the failure mode of experimental groups. Materials and Methods: Forty bovine incisors were used, enamel surfaces were ground by silicon carbide paper and samples were randomly assigned into two main groups (Gp A: Non lased group, GpB: lased prepared group). Each main group was subdivided randomly according to the adhesive systems that were used which are: total-etch adhesive (Teco, DMG, Hamborg, Germany) and self-etch adhesive (contax, DMG, Hamborg, Germany). Adhesives applied to the prepared enamel surface according to manufacture instruction. Composite rod applied over the bonded area and cured. Samples were stored in distilled water at 370for 24 hours. The evaluation of shear bond strength was employed by the use of universal testing machine.
One of the goals of endodontic treatment is the complete debridement of the root canal system. Mechanical cleaning can greatly reduce the number of microorganisms but not completely eliminating them. Therefore, there is a need for an irrigant to enhance debridement. Sodium hypochlorite is still the most widely used irrigation solution in endodontics. However, many new irrigants have been introduced, MTAD is one of them. It is a mixture of tetracycline isomer, an acid and a detergent. MTAD is capable of removing the smear layer without causing excessive erosion and it has an antibacterial action against E. faecalis. With the more interest in resin-based obturation materials, it has been important to study the effect of the used irrigants on the adhesion of those materials to dentine. As MTAD is not a single component it is wise to study its effect on the adhesion of a self-etch resin-based sealer (Epiphany SE) to dentine.
The effect of different concentrations of hydrogel of sodium ascorbate on bond strength of bleached enamel for varying periods of time and the mode of failure was evaluated.Seventy enamel surfaces were obtained from 35 human extracted premolars. Specimens were divided into four groups: no bleaching (control), bleaching with carbamide peroxide gel, bleaching and application of 10% / 20% sodium ascorbate hydrogel for 30, 60, 120 min. Surfaces were bonded with a total etch bonding system and composite resin. Specimens were tested for shear bond strength. Mode of failure was determined by stereomicroscope. Data were analyzed using a two-way analysis of variance, and Scheffe's post hoc test. Sodium ascorbate hydrogel application following bleaching increased the resin-enamel bond strength and was directly proportional to its duration of application. However, there was no difference in bond strength with an increase in the concentration of sodium ascorbate hydrogel. Immediate bonding of composite resin to bleached enamel is possible after treatment with antioxidant sodium ascorbate hydrogel.
Many studies have been done on the shear bond strength of brackets adhered to acid-etched enamel and so far, there is no study on shear bond strength of brackets adhere to laser-etched enamel in Iraq. So, this study is an attempt to compare the shear bond strength of brackets adhered to laser-etched enamel with that of brackets adhered to acid-etched enamel. The application of laser irradiation to etch dental enamel for direct bonding of orthodontic appliance has been studied. CO2 (Carbon Dioxide) laser are capable of producing surface irregularities in human enamel which resemble those resulting from etching of enamel with ortho-phosphoric acid. Whether laser conditioning improves the retention of composite resins to the same degree as conventional acid-etching techniques has been the subject of several investigations.
This study was carried out to evaluate and compare the shear bond strengths between the orthodontic bracket and acid etched enamel, enamel treated with self-etch primer and laser irradiated enamel and to analyze the interface of the enamel bracket bond.It will help students, teachers and othodontia practitioners as it deals with the most contemporarily used bonding techniques. The results indicate that the shear bond strength of all the three groups was clinically acceptable with no significant difference between them but more adhesive was left on enamel treated with acid and laser as compared to self-etch primer treated enamel.