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Full-Text Articles in Medicine and Health Sciences
Comparing Volumetric Wear Of Lithium Disilicate Against Different Ceramics And Enamel Antagonist An In-Vitro Study, Krisha Shah
Comparing Volumetric Wear Of Lithium Disilicate Against Different Ceramics And Enamel Antagonist An In-Vitro Study, Krisha Shah
All ETDs from UAB
Background: In patients with restored dentitions, it is possible for crowns on opposing teeth to gradually wear each other through chewing and bruxism. Therefore, the wear of restorative materials used for dental crowns is an important mechanical property for their long-term clinical success. Lithium disilicate is a widely used dental ceramic due to its strength, machinability, and translucency. Due to the rising use of ceramic restorations, a comparison of the wear resistance of lithium disilicate against different ceramic crown materials is useful for the clinician when selecting a crown material to oppose an existing lithium disilicate crown. Objective: To compare …
Effects Of Light Curing Bonding Agent With Dual Cure Cement On The Retention Of Zirconia And Lithium Disilicate Crowns: An In-Vitro Study., Mariam Issa
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Objective: To measure and compare the bond strength of zirconia and lithium disilicate crowns bonded to human teeth (enamel and dentin) using universal adhesive with resin cement and different light curing protocols.Methods: Sixty extracted sound non carious human teeth (second premolars) were stored in formalternate solution (FormalternateTM, Concentrate, 500 mL, Canada) and the roots were notched and mounted into acrylic resin (Yates Motloid, USA). Flat surface preparation was done on the occlusal surface of the samples using model trimmer. The surface area of the specimens was measured with digital light microscopy. Samples were randomly divided into six groups of 10 …
Effect Of Different Supporting Die Materials And Crown Thicknesses On The Fracture Load Of Monolithic 3y-Tzp Zirconia And Lithium Disilicate Crowns, Akram Mohamed Mohamed Gad Sayed Ahmed
Effect Of Different Supporting Die Materials And Crown Thicknesses On The Fracture Load Of Monolithic 3y-Tzp Zirconia And Lithium Disilicate Crowns, Akram Mohamed Mohamed Gad Sayed Ahmed
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Background: Conventionally, the strength of dental materials used for fixed restorations is measured using specimens of simplified geometry (i.e bars or discs). There is value in measuring the strength of these materials in their anatomic geometry (i.e crowns) under clinically relevant loading conditions. One advantage of performing the so-called crown fracture test is that the material may benefit from its ability to be strengthened by its bond to a tooth-mimicking die. When performing a crown fracture test, the ideal die material is natural tooth structure. However, the variability in natural tooth anatomy and microstructure makes the use of a standardized, …
Effect Of Saliva Contamination On Crown Retention Strengths Of Resin And Rmgi Cements, Bushra Nizami
Effect Of Saliva Contamination On Crown Retention Strengths Of Resin And Rmgi Cements, Bushra Nizami
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Background: The most common contaminant in the oral cavity is saliva. Many studies have shown that contamination with saliva negatively affects the strength of the resin-dentin bond. A literature review by Nair et al reported that 64.6% of studies on the topic show a detrimental effect of salivary contamination on adhesive materials. No published studies were found that thoroughly studied the effects of saliva contamination on RMGIs and resin cements with regards to crown retention rates. Objective: To study the effect of salivary contamination on crown retention strengths of RMGI and resin cements at various stages of bonding and in …
Effect Of Cement Selection On Retention Of Zirconia And Lithium Disilicate Crowns, Chan-Te Huang
Effect Of Cement Selection On Retention Of Zirconia And Lithium Disilicate Crowns, Chan-Te Huang
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Background: Ceramic crowns (lithium disilicate and zirconia) have become the most prescribed material for the restoration of anterior and posterior teeth due to the esthetic concerns of patients and the high cost of noble alloys. Different types of cements are used for luting crowns such as zinc phosphate, glass ionomer, resin modified glass ionomer (RMGI), resin cements and bioactive cements. Selection of different cements and bonding protocols for zirconia or lithium disilicate crowns to increase their bonding strength remains a clinical challenge for dentists. Objectives: To measure the retention strength of lithium disilicate and zirconia crowns cemented with different cements. …
The Retention Of Zirconia Crowns Luted With Resin And Rmgi Cements And The Effect Of Salivary Contamination, Stephen Liu
The Retention Of Zirconia Crowns Luted With Resin And Rmgi Cements And The Effect Of Salivary Contamination, Stephen Liu
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Purpose: To measure retention of zirconia crowns bonded with resin and RMGI cements and the effect of salivary contamination following 10,000 cycles of thermocycling. Materials and Methods: 64 extracted human mandibular premolars were divided into eight groups (n = 8/group). The specimens in each group were prepared for Katana HT zirconia (eight groups) and one of four luting cements (one for each group): 3M ESPE RelyX Luting Plus RMGI, 3M ESPE Rely X Unicem 2 self-adhesive, Kuraray Panavia SA Universal self-adhesive, and 3M ESPE RelyX Ultimate dual cure resin cement with Scotchbond Universal. The roots of the selected teeth were …
Surface Treatment Effects On Shear Bond Strength And Biaxial Flexural Strength Of Three Generations Of Zirconia, Yasko A. Darkoue
Surface Treatment Effects On Shear Bond Strength And Biaxial Flexural Strength Of Three Generations Of Zirconia, Yasko A. Darkoue
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SURFACE TREATMENT EFFECTS ON SHEAR BOND STRENGTH AND BIAXIAL FLEXURAL STRENGTH OF THREE GENERATIONS OF ZIRCONIA YASKO A. DARKOUE MASTER OF SCIENCE IN DENTISTRY ABSTRACT Objectives: Mechanical and chemical surface treatments are required to achieve a durable bond to zirconia. The objective of this study is to compare the effects of particle abrasion and pressure on shear bond strength and biaxial flexural strength of Lava (Frame, Plus and Esthetic) zirconia to obtain a favorable combination of pressure and particle type to produce optimum strength and optimize the bond produced. A protocol for mechanical treatment balancing strength of the type zirconia …
Retention Of Zirconia Crowns Following Different Bonding Protocols, Suruchi Lamba
Retention Of Zirconia Crowns Following Different Bonding Protocols, Suruchi Lamba
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Objective: To measure and compare the retention of zirconia crowns cemented with Ceramir (Calcium phosphate-based Bioactive Cement), RelyX Luting Plus (RMGI Cement) and RelyX Unicem (Self-adhesive resin cement) to extracted teeth following thermocycling. Methods: 30 sound extracted non-carious human molars were collected following IRB approval. The selected molars were notched at the roots and mounted into PVC molds filled with acrylic resin (Yates Motloid, USA). The occlusal surface was ground flat on a model trimmer. The axial reductions were performed with a standardized crown preparation device using a Komet 5845KR (“onlay”) diamond bur. A 10 degree ramp was used to …
An In Vitro Evaluation Of Abutment Design For Anterior Zirconia Resin Bonded Restorations, Watcharapong Aroonsang
An In Vitro Evaluation Of Abutment Design For Anterior Zirconia Resin Bonded Restorations, Watcharapong Aroonsang
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Resin-bonded fixed partial dentures (RBFPDs) have evolved from metal frameworks to esthetic all ceramic tooth colored restorations. However these restorations frequently fail due to a loss of retention of the retainers. As the frameworks for these restorations have changed to more esthetic ceramic materials, the search for the ideal conservative preparation design providing maximum retention is critical to improve the life span of these restorations. Purpose: This in vitro evaluation measured and compared the resistance and retention created with different abutment preparation designs with a zirconia framework. Method: 21 extracted human maxillary central incisors were divided into three groups of …
Retentive Strength At The Zirconia Implant Abutment And Titanium Base Interface With Different Surface Treatments, Celin Arce
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Screw-retained zirconia implant crowns with an internal titanium base have favorable mechanical properties compared to single piece zirconia implant crowns; however, they require adequate bonding between the zirconia crown and the titanium base. This study measures the retention between a titanium base and a full contour zirconia implant crown following different surface treatments of their bonded surfaces. Full contour zirconia implant crowns were fabricated to fit a 3.5mm titanium base. The crowns were bonded to the titanium bases following 4 protocols (n=15): no surface treatment (Group 1), MDP-primer on the intaglio of crown and exterior of base (Group 2), alumina …
Preparation Of Zirconia For Bonding Following Salivary Contamination, Pattarika Angkasith
Preparation Of Zirconia For Bonding Following Salivary Contamination, Pattarika Angkasith
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Purpose: To determine the best method of cleaning saliva-contaminated zirconia in order to regain its bond strength. Methods: Flat blocks of zirconia were particle-abraded with aluminum oxide and divided into eight groups (n=10). Groups 1-5 were first treated with 1 coat of an MDP-primer (Z-Prime Plus, Bisco) and groups 5-8 were left untreated. All specimens were contaminated with human saliva for 3 minutes other than the control (group 1). The specimens were then cleaned by rinsing with water for 20 sec (groups 2 and 5), cleaning with 35% phosphoric acid for 20 sec and rinsing (group 3 and 6), cleaning …
Cutting Effectiveness Of Diamond Burs On Dental Zirconia., Ching-Kai Lin
Cutting Effectiveness Of Diamond Burs On Dental Zirconia., Ching-Kai Lin
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Monolithic zirconia restorations are popular but removing these crowns is difficult. The purpose of the study is to measure and compare the cutting effectiveness of 10 types of diamond burs through monolithic sintered zirconia. Ten types of diamond burs (n=8) were compared for the cutting effectiveness in Zirconia (CERCON; DeguDent) using a high speed computer controlled cutting device with water spray (5.45L/min). The turbine used to cut the blocks rotated at 150,000 rpm and with the burs at a depth of 2mm into the zirconia during cutting. A 100 gm load was applied during cutting for each bur which made …
Effect Of Abutment Position On Retention After Cyclic Loading Of Cantilevered Y-Tzp Fpds, Aikaterini Kostagianni
Effect Of Abutment Position On Retention After Cyclic Loading Of Cantilevered Y-Tzp Fpds, Aikaterini Kostagianni
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Purpose: The influence of the vertical abutment positions on the retention of a three-unit implant supported cantilevered FPD restoration was measured and compared. Methods: The study included four groups (n=10) of cantilevered FPDs restorations, fabricated of monolithic zirconia. Prefabricated titanium implant abutments were used and connected to their analogs. The analogs were fixated on a split mold and their vertical position was adjusted on a 2 mm bases depending on the group, resulting also to an alteration of the occlusal thickness of the restorative material. The prosthesis were cemented to the abutments with Rely X Luting Plus resin modified glass …
Influence Of Surface Treatment Of Y-Tzp And Luting Cements On Retention Of Y-Tzp Crown, Mehdi Karimipour-Saryazdi
Influence Of Surface Treatment Of Y-Tzp And Luting Cements On Retention Of Y-Tzp Crown, Mehdi Karimipour-Saryazdi
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Clinicians for a single tooth restoration, due to improved esthetics, often select all ceramic crowns. Zirconium Oxide has been utilized for many years to full fill the requirement of esthetics, high mechanical properties and biocompatibility. The purpose of this study is to evaluate the effect of different surface treatments and luting agents on retention of a zirconium oxide crown. Material and Methods: Ninety extracted teeth were obtained. Teeth were mounted in Ortho JetTM resin (Lang Dental Manufacturing Co., Inc. IL, USA). Occlusal surface was cut flat using Isomet (Buhler Ltd). Diamond burs were used to cut axial walls under water …
Fracture Strength Of All-Ceramic Restorations After Fatigue Loading, Balasudha Baladhandayutham
Fracture Strength Of All-Ceramic Restorations After Fatigue Loading, Balasudha Baladhandayutham
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Fracture strength of monolithic and bilayered LAVA and e. max lower molar crowns after load cycling was measured and compared. The study included three groups (n = 8) from LAVA zirconia and three groups from e. max lithium disilicate to compare influences of different layers, thicknesses and manufacturing techniques. Prefabricated anatomically designed crowns were cemented to dies made from Z 100 composite resin using Rely X Luting Plus resin modified glass ionomer cement. Cemented crowns were stored at 37° C for 24 hours then cyclic loaded to test fatigue properties. The crowns were loaded to 200,000 cycles at 25N at …