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Articles 1 - 12 of 12
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 …
Evaluation Of Colour Reproduction Of Cad/Cam Lithuim-Disilicate Veneers Of Different Thicknesses And Translucency, Sahar H. Fikry, Tarek Salah Morsi, Mennatallah M. Wahba, Amr El-Etreby
Evaluation Of Colour Reproduction Of Cad/Cam Lithuim-Disilicate Veneers Of Different Thicknesses And Translucency, Sahar H. Fikry, Tarek Salah Morsi, Mennatallah M. Wahba, Amr El-Etreby
Future Dental Journal
Background: With the increasing patients’ demand for a perfect smile, the call for highly aesthetic and yet minimally invasive veneers has surmounted. Objective: The aim of this study was to evaluate the colour of CAD/CAM lithium disilicate veneers fabricated in different thicknesses and different translucencies of the lithium disilicate blocks. Materials and Methods: Forty discs of lithium disilicate glass-ceramic (IPS e.max CAD) of shade A1 of both high and low translucency (HT, LT) were tested for their colour reproduction. HT and low LT blocks were cut in the form of plates of dimensions (12 x 14 mm) and of different …
Effect Of Etch Time On Sbs Of Machinable Lithium Disilicate Glass Ceramics Using Variolink Esthetic Lc, Mayur Chandrakant Nayee
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 …
Finishing Procedures Action On Mechanical Characteristics Of Pressed Ceramics, Mohamed Ahmed, Amina Mohammad Hamdy, Amr El-Etreby
Finishing Procedures Action On Mechanical Characteristics Of Pressed Ceramics, Mohamed Ahmed, Amina Mohammad Hamdy, Amr El-Etreby
Future Dental Journal
Objectives: The choice of material and sequence of finishing & polishing of pressed ceramics which are broadly used for indirect restorations applying different polishing methods on the glazed ceramic surfaces has not been agreed on yet so a comparison of different finishing protocols on the mechanical strength of pressed ceramics in a clinical simulating trial is of a paramount significance, in this study The effect of different grinding & finishing procedures on the biaxial flexural strength of pressed ceramics was evaluated. Material and methods: all ceramic Ips emax press discs were fabricated with a circular projection in the middle to …
Bond Of Resin Cements Through Three Ceramics At Varying Thickness, Po-Hsu Chen
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 …
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
All ETDs from UAB
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
All ETDs from UAB
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 …
Effect Of Increased Implant Crown Height On Fracture Strength Of Ips-E.Max Cad Hybrid Abutment Crown: An In-Vitro Study, Mohammad Mehdi Imani-Emadi
Effect Of Increased Implant Crown Height On Fracture Strength Of Ips-E.Max Cad Hybrid Abutment Crown: An In-Vitro Study, Mohammad Mehdi Imani-Emadi
Student Theses, Dissertations and Capstones
Introduction: The use of a secondary titanium insert has a beneficial influence on the stability of ceramic abutments and appears to be clinically useful for premolar and molar single-tooth replacements. Available titanium inserts in the market produced by Sirona, have a single height of 4.6mm with various platform diameters for different implant systems. The aim of this in-vitro study was to determine the fracture strength of IPS-e.max CAD hybrid abutment crowns with various crowns heights by simulating cyclic masticatory loads in vitro. Materials and Methods: Forty conical AstraTech EV dental implants, 4.2 mm in diameter and 9.0 mm in length …
Comparison Of Cutting Efficiency Of Different Rotary Instruments, On Two Different Ceramic Materials Using Electric And Air-Turbine Dental Hand-Pieces, Salam Hetou
Student Theses, Dissertations and Capstones
Objective. This study compared the cutting efficiency of different diamond rotary cutting instruments on twoceramic materials when used with an electric handpiece versus an air-turbine handpiece. The amount of surface roughness exhibited by an electric hand-piece was also evaluated in comparison with an air-turbine hand-piece, when used to cut through ceramic restorative materials in a simulated crown removal procedure. Materials and Methods.One-hundred and sixty ceramic specimens were fabricated from lithium disilicate (IPS e.max Press, Ivoclar Vivadent, Amherst, NY) and zirconium oxide (ZirCAD, Ivoclar Vivadent, Amherst, NY) with standardized dimensions (5mm x 2mm x 20mm). Samples were divided into eight groups …
Effect Of Prophylactic Pastes On Surface Roughness And Gloss Of Esthetic Dental Restorative Materials, Thani Alsharari
Effect Of Prophylactic Pastes On Surface Roughness And Gloss Of Esthetic Dental Restorative Materials, Thani Alsharari
Student Theses, Dissertations and Capstones
Objective: To evaluate the average surface roughness (Ra) and gloss (GU) of four different commonly used ceramics, four resin composites and human enamel after application of four different types of prophylactic pastes. Material and methods: A total of two hundred and forty specimens, composed of four types of ceramics and four types of resin composites were prepared to test the hypothesis. Twenty specimens were assigned to the first two ceramic groups: Lithium disilicate (LiSi2), and Feldspathic ceramic (FP). The third ceramic group, Zirconia (Zi) included one-hundred and twenty specimens divided into two groups of sixty specimens each (IPS e.max ZirCAD …
Bonds And Contact Angles Produced With Surface Alterations To Lithium Disilicate, Vamsi Krishna Kalavacharla
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 …
Fracture Strength Of All-Ceramic Restorations After Fatigue Loading, Balasudha Baladhandayutham
Fracture Strength Of All-Ceramic Restorations After Fatigue Loading, Balasudha Baladhandayutham
All ETDs from UAB
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 …