Medicine and Health Sciences Commons^™

Effect Of Etch Time On Sbs Of Machinable Lithium Disilicate Glass Ceramics Using Variolink Esthetic Lc, Mayur Chandrakant Nayee

All ETDs from UAB

The purpose of this study is to measure the shear bond strength between dental cement and four different machinable, lithium disilicate glass ceramics, under varied etch time with hydrofluoric acid. Ten specimens each of 4 different machinable blocks of lithium disilicate were mounted in cylinders of pink acrylic resin. Each specimen was subjected to etching with hydrofluoric acid, rinsing with water from an air / water nozzle, drying with compressed air, application of a silane primer (Monobond Plus, Ivoclar Vivadent) for at least 60 seconds, then mounted in an Ultradent jig and Variolink Esthetic LC (Ivoclar Vivadent) cement extruded through …

An In Vitro Comparison Of Shear Bond Strength Between Two Orthodontic Light-Curable Adhesive Pastes, Stephanie Becker

Graduate Theses, Dissertations, and Problem Reports

Background and Objectives: A relatively new light-cure orthodontic adhesive BracePaste^® can fluoresce under UV light to assist in cleaning up excess flash after bonding. Complete removal of excess resins around the bonded brackets may minimize excessive loss of enamel upon debonding. The objective of this study was to determine the shear bond strength of BracePaste compared to that of the conventional “Transbond XT” adhesive. Additionally, enamel and bracket interfaces were examined to determine the location of bond failure and the tooth surfaces were visually examined to assess severity of enamel marks and the presence of remaining adhesives on the …

Metal Additive Manufacturing For Fixed Dental Prostheses, Mai El Najjar

Electronic Thesis and Dissertation Repository

The use of additive manufacturing (AM) in dentistry has gained momentum in recent years. However, high initial costs and uncertainty surrounding the quality of AM products are considered barriers to their use. This research compared dental substructures fabricated by AM versus conventional casting and milling.

Cobalt-chromium alloy rectangular bars and three-unit bridge substructures were fabricated by AM, casting or milling. Bars manufactured by AM exhibited superior flexural strength, shear bond strength of porcelain coating, and Vickers hardness. Bridge substructures fabricated by AM showed similar flexural stiffness to cast, similar flexural loads at failure to milled and cast, and overall accuracy …

Bond Of Resin Cements Through Three Ceramics At Varying Thickness, Po-Hsu Chen

All ETDs from UAB

The purpose of this study was to determine the bond strength of a light cured resin when cured through 3 different types of dental ceramics (traditional zirconia with 3 mol% yttria, translucent zirconia with 5 mol% yttria, and lithium disilicate) at 2 different thicknesses. A total of 135 specimens were prepared from traditional zirconia (IPS e.max ZirCAD LT, Ivoclar Vivadent, Liechtenstein), translucent zirconia (IPS e.max ZirCAD MT, Ivoclar Vivadent, Liechtenstein), and lithium disilicate (IPS e.max CAD LT, Ivoclar Vivadent, Liechtenstein) into a plate shape, but in different thicknesses (1mm and 1.5mm). Ceramic buttons were fabricated by pressed lithium disilicate (IPS …

Reliability Of Bond Strength Using Universal Adhesives To Variable Dentin Conditions, Marwa Bawazir

Student Theses, Dissertations and Capstones

Brief Background: Both three-step etch-and-rinse adhesives and universal adhesives have proven their effectiveness to produce successful bond to dentin. However, there are no studies comparing adhesives’ bond strength when applied by multiple operators, and to variable dentin conditions. Objectives: To evaluate and compare the bond strength of a universal adhesive when applied by multiple operators, and to variable dentin conditions, in comparison to three- step etch-and-rinse adhesive. Methods: Three hundred extracted human teeth were embedded in resin. Five dentists with at least ten years of experience in general dentistry and five pre-dental students applied a universal adhesive (Adhese Universal, Ivoclar …

Effect Of Shear Bond Strength With Novel Apc™ Flash-Free Brackets And Different Bonding Protocol: An In Vitro Study, Carl Bernstein

Graduate Theses, Dissertations, and Problem Reports

Background and Objectives: In today’s time, there is an increasingly crowded field of competition vying over a small subset of the population. Now, more than ever it is imperative to compete with efficiency and esthetics. Each step for orthodontic bonding procedures increases the chance for error to occur. However, orthodontic bracket, etchant, sealant, and adhesive material has the ability to improve bond strength and final outcome for the patient and provider. The aim of this study was to determine effective bonding protocols for Advanced Clarity APC™ Flash-Free Brackets and to determine if adhesive remains on enamel or orthodontic bracket after …

Effect Of Air-Abrasion Preparation On Shear Bond Strength Of Orthodontic Brackets To Enamel Surface, Elliott Katz

Student Theses, Dissertations and Capstones

Introduction: An optimal orthodontic bonding system must minimize damage to the enamel during conditioning, have enough bond strength to prevent bracket de-bonding during treatment, and allow bracket removal at treatment completion, such that minimal damage is inflicted to the tooth.1 Pumice followed by acid etching has been the standard for many years; however, Groman Inc. (Margate, FL, USA) has stated that using their air-abrasion product will result in a tripling of bond strength. This method claims a three-fold increase in bond strength compared to traditional acid etching techniques by substituting air-abrasion using the EtchMaster® (Groman Inc., Margate, FL) 50 μm …

Evaluation Of Microshear Bond Strength Of Light-Cured Composite For Cementation Of Ceramic Veneer, Khalid Motlaq

Student Theses, Dissertations and Capstones

Brief background and goal/ research question: Ceramic restorations were introduced as indirect restorative materials that combine high esthetics with superior mechanical properties. However, an important requirement for successful function of these restorations is adequate adhesion between the restoration material and tooth structure. The use of CAD/CAM restorations is steadily increasing, proper function and longevity of these restorations depends on good adhesion to the underlying substrate as well as operator technique. Preheated composite has been recommended by some clinicians and investigators for the adhesive luting of porcelain laminate veneers based on its good marginal adaptation and perceived superior mechanical durability when …

Evaluation Of The Effect Of Enamel Deproteinization On Shear Bond Strength Of Orthodontic Adhesives And Resulting White Spot Lesion Formation, Kelly Chioffe

Student Theses, Dissertations and Capstones

A thesis submitted to the College of Dental Medicine of Nova Southeastern University of the degree of Master of Science in Dentistry.

Objective: The objectives of this study were 1) to evaluate the effect of enamel deproteinization on the shear bond strength(SBS) of orthodontic brackets bonded with a resin modified glass-ionomer (RMGI) adhesive and a composite resin, 2) to determine the mode of bond failure according to the adhesive remnant index (ARI) and 3) to evaluate the effect of these adhesives in the prevention of white spot lesions (WSLs). Background: WSLs are a concern for orthodontic patients. RMGI orthodontic adhesives …

Bonds And Contact Angles Produced With Surface Alterations To Lithium Disilicate, Vamsi Krishna Kalavacharla

All ETDs from UAB

The success of ceramic restorations depends upon factors like the composite resin cement, the adhesive, cementation procedure and the substrate. With the introduction of newer ceramic and adhesive systems the factors that contribute to the most durable bond strength remains unclear. The objective of the study was to measure 24 hour and thermocycled shear bond strength of a composite to lithium disilicate glass ceramic with a universal single bottle adhesive. A combination of surface treatments of hydrofluoric acid, silane, salivary contamination and subsequent cleaning were also evaluated. Blocks of lithium disilicate (e.max CAD) were sectioned, polished with a rotational polishing …

Effect Of Light-Cure Initiation Time On Polymerization And Orthodontic Bond Strength With A Resin-Modified Glass-Ionomer, Jess Thomas

Master's Theses (2009 -)

Introduction: The polymerization and acid<–>base reactions in resin<–>modified glass<–>ionomers (RMGI) are thought to compete with and inhibit one another. The objective of this study was to examine the effect of visible light<–>cure (VLC) delay on the polymerization efficiency and orthodontic bond strength of a dual<–>cured RMGI.

Methods: An RMGI light<–>cured immediately, 2.5, 5, or 10 minutes after mixing comprised the experimental groups. Isothermal and dynamic temperature scan differential scanning calorimetry (DSC) analysis of the RMGI was performed to determine extents of VLC polymerization and acid<–>base reaction exotherms. Human premolars (n = 18/group) were …

The Effect Of Pre-Cure Bracket Movement On The Shear Bond Strength Of Metal Brackets, Thomas Luther Roberts Iv

Theses and Dissertations

The effect on shear bond strength of bracket movement after seating the brackets and before light curing has not been reported. The purpose of this study was to determine the effect of linear and rotational pre-cure bracket movement on the shear bond strength of orthodontic brackets. 100 extracted human maxillary premolars were divided into 5 groups of 20 teeth each. The control group was bonded with no pre-cure bracket movement, and test groups were bonded with pre-cure bracket movement of 2 mm, 4 mm, 45¢ª or 180¢ª. Debonding force was measured with an Instron universal testing machine. Results were analyzed …

Evaluation Of Shear Bond Strength Of Two Resin-Modified Glass-Ionomer Cements, Emily Y. Ro

Theses and Dissertations

Purpose: To compare the in-vitro shear bond strengths of a new paste-paste formulation of resin-modified glass-ionomer cement (Rm-GIC) to an exising powder-liquid formulation. The study will test the hypothesis that the new paste-paste formulation of Rm-GIC (Fuji-Cem ™, GC Corp, Tokyo, Japan) has the same bond strength as an existing popular powder-liquid formulation of Rm-GIC (Rely-X ™ Luting Cement, 3M, St. Paul, MN)Materials and Methods: A total of 33 human molars were sectioned parallel to the occlusal surface to expose mid-coronal dentin and mounted parallel to the bond shearing device on the universal testing machine (Instron). For Group I samples …