scholarly journals Retention Forces of Monolithic CAD/CAM Crowns Adhesively Cemented to Titanium Base Abutments—Effect of Saliva Contamination Followed by Cleaning of the Titanium Bond Surface

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3375
Author(s):  
Felix Burkhardt ◽  
João Pitta ◽  
Vincent Fehmer ◽  
Philippe Mojon ◽  
Irena Sailer
Keyword(s):  
Failure Analysis ◽  
Lithium Disilicate ◽  
Water Spray ◽  
Airborne Particle ◽  
Bond Failure ◽  
Retention Force ◽  
Cad Cam ◽  
Bonding Properties ◽  
Saliva Contamination ◽  
Mechanical Aging

The aim of this study was to investigate the effects of saliva contamination and the cleaning of the bond surface of titanium base (ti-base) abutments on the bonding stability and retention force values. The bond surface of the ti-base abutments was treated with airborne-particle abrasion. After contamination, the ti-base abutments underwent different cleaning protocols: water spray (H2O); alcohol (ALC); suspension of zirconium particles (SZP); reapplied airborne-particle abrasion (APA); and a control condition without contamination and cleaning (CTR). All lithium disilicate crowns were bonded to the ti-base abutments using a primer and a self-curing composite. Bonded specimens underwent thermo-mechanical aging. Bond failure analysis and pull-off testing were performed. Bond failure occurred more frequently in groups H2O, ALC, SZP, and APA (p < 0.05). Significant differences in retention force values were only found between CTR and ALC (p < 0.05). Specimens which did not show bond failure after ageing had higher retention force values than the specimens that showed bond failure (p < 0.05). Saliva contamination with cleaning can degrade the bonding properties to titanium. For the retention force values, only the protocol with alcohol after contamination could not restore the values.

Evaluation of bond strength of dual resin cements to CAD/CAM-created lithium disilicate ceramic

2020 ◽  
Vol 69 (3) ◽  
Author(s):  
Felipe Sczepanski ◽  
Cláudia R. Brunnquell ◽  
Sandrine B. Berger ◽  
Eloisa A. Paloco ◽  
Murilo B. Lopes ◽  
...  
Keyword(s):  
Bond Strength ◽  
Lithium Disilicate ◽  
Resin Cements ◽  
Cad Cam

scholarly journals Adhesion procedure for CAD/CAM resin crown bonding: Reduction of bond strengths due to artificial saliva contamination

2018 ◽  
Vol 62 (2) ◽  
pp. 177-183 ◽  
Author(s):  
Asuka Kawaguchi-Uemura ◽  
Atsushi Mine ◽  
Mariko Matsumoto ◽  
Yuko Tajiri ◽  
Mami Higashi ◽  
...  
Keyword(s):  
Artificial Saliva ◽  
Cad Cam ◽  
Bond Strengths ◽  
Saliva Contamination

scholarly journals Analytical Assessment of Fatigue Strength of a Dental Crown

2020 ◽  
Vol 8 (6) ◽  
pp. 2689-2693
Keyword(s):  
Failure Analysis ◽  
Degrees Of Freedom ◽  
Field Variable ◽  
Static Fatigue ◽  
Medical Field ◽  
Element Analysis ◽  
3D Cad ◽  
Design For All ◽  
Cad Cam ◽  
Analytical Assessment

With the accomplishment of new engineering science and technologies, machineries formulated by the the technocrats are utilized in medical field. Biomedical Engineering has thus gained a prominent status in the recent years. Few decades ago, it was considered as weird thing if any mechanical engineers performed studies on dental area, but in today’s scenario mechanical engineers are doing studies as well as research in the area of dental science. In this paper an attempt has been made to select best crown material for molar tooth, So that an appropriate material can be placed in the human body which is most difficult task .so for designing a molar crown, modeling is done in pro/engineer software, it is one of the parametric 3D CAD/CAM/CAE solution widely used by mechanical engineers for designing any product .this software creates a complete 3D Digital model of the product. For this extensive research, design for all crowns will be the same but only material properties will be different. After design, failure analysis is done. Loss of ability to function normally is the study of failure analysis. This is accomplished by considering various loading conditions .Here finite element analysis is used, the standard principle underlying the FEM are simple. The word finite is used to describe the limited, or finite, number of degrees of freedom used to model the behavior of each element, the element are assumed to be connected to one another but only at interconnected joints, known as nodes. Considering a body through which the distribution of a field variable I.e. displacement or stress is required, this body could be subjected to various loads. Problem is solved by two methods: static fatigue and dynamic fatigue

scholarly journals LED and Halogen Light Transmission through a CAD/CAM Lithium Disilicate Glass-Ceramic

2015 ◽  
Vol 26 (6) ◽  
pp. 648-653 ◽  
Author(s):  
Carolina Nemesio de Barros Pereira ◽  
Cláudia Silami de Magalhães ◽  
Bruno Daleprane ◽  
Rogéli Tibúrcio Ribeiro da Cunha Peixoto ◽  
Raquel da Conceição Ferreira ◽  
...  
Keyword(s):  
Regression Model ◽  
Glass Ceramic ◽  
Light Transmission ◽  
Light Attenuation ◽  
Lithium Disilicate ◽  
Strong Negative Correlation ◽  
Halogen Light ◽  
Significant Difference ◽  
Cad Cam ◽  
Ceramic Thickness

The effect of thickness, shade and translucency of CAD/CAM lithium disilicate glass-ceramic on light transmission of light-emitting diode (LED) and quartz-tungsten-halogen units (QTH) were evaluated. Ceramic IPS e.max CAD shades A1, A2, A3, A3.5, high (HT) and low (LT) translucency were cut (1, 2, 3, 4 and 5 mm). Light sources emission spectra were determined. Light intensity incident and transmitted through each ceramic sample was measured to determine light transmission percentage (TP). Statistical analysis used a linear regression model. There was significant interaction between light source and ceramic translucency (p=0.008) and strong negative correlation (R=-0.845, p<0.001) between ceramic thickness and TP. Increasing one unit in thickness led to 3.17 reduction in TP. There was no significant difference in TP (p=0.124) between shades A1 (ß1=0) and A2 (ß1=-0.45) but significant reduction occurred for A3 (ß1=-0.83) and A3.5 (ß1=-2.18). The interaction QTH/HT provided higher TP (ß1=0) than LED/HT (ß1=-2.92), QTH/LT (ß1=-3.75) and LED/LT (ß1=-5.58). Light transmission was more effective using halogen source and high-translucency ceramics, decreased as the ceramic thickness increased and was higher for the lighter shades, A1 and A2. From the regression model (R2=0.85), an equation was obtained to estimate TP value using each variable ß1 found. A maximum TP of 25% for QTH and 20% for LED was found, suggesting that ceramic light attenuation could compromise light cured and dual cure resin cements polymerization.

Influence of etching procedure on pressable and CAD–CAM lithium-disilicate surface

2014 ◽  
Vol 30 ◽  
pp. e38
Author(s):  
M. Sedda ◽  
R. Fabian Fonzar ◽  
M. Carrabba ◽  
M. Tricarico ◽  
A. Vichi ◽  
...  
Keyword(s):  
Lithium Disilicate ◽  
Cad Cam

A Comparative Study of Light Transmission by Various Dental Restorative Materials and the Tooth Structure

2019 ◽  
Vol 45 (4) ◽  
pp. 442-452 ◽  
Author(s):  
N Ilie ◽  
G Furtos
Keyword(s):  
Optical Properties ◽  
Glass Ceramic ◽  
Light Transmission ◽  
Lithium Disilicate ◽  
Lithium Silicate ◽  
Restorative Process ◽  
Tooth Structure ◽  
Computer Aided ◽  
Restorative Materials ◽  
Cad Cam

Clinical Relevance Light transmission through dental materials and tooth structure has direct clinical implication on such factors as selecting an appropriate curing technique during a restorative process. SUMMARY Introduction: This study aims to quantify and compare the amount of light that passes through seven different types of direct and indirect restorative materials comprising light-cured resin based composites (regular and bulk-fill), computer-aided design/computer-aided manufacturing (CAD/CAM) restoratives such as resin based composites, poly(methyl methacrylate) (PMMA) resin, leucite glass-ceramic, lithium silicate glass-ceramic, feldspar ceramic, and the natural tooth structure. Methods and Materials: Individual sets (n=6) of plane-parallel test specimens (2 mm) of 32 restorative materials belonging to the aforementioned seven material types and the tooth structure were prepared. Within the analyzed materials, one leucite glass-ceramic and one lithium disilicate glass-ceramic were considered in two different translucencies. In addition, two light-cured resin composites, one CAD/CAM resin composite, and one lithium disilicate glass-ceramic were considered in two different shades. Optical properties (transmittance, T; absorbance, A; and opacity, O) of each material were calculated from the relationship between incident and transmitted irradiance [I(d)] using a violet-blue light-curing unit. Incident and transmitted irradiance were assessed in real time on a spectrophotometer. A multivariate analysis (general linear model) assessed the effects of various parameters on the optical properties. Results: A very strong influence of the parameter material was identified on I(d) (p&lt;0.001; partial eta squared, ηP2=0.953), T (p&lt;0.001; ηP2=0.951), A (p&lt;0.001; ηP2=0.925), and O (p&lt;0.001; ηP2=0.886), while the effect of the parameter material type was not significant (p=0.079, p=0.05, p=0.05, and p=0.051, respectively). Light attenuation differed significantly by material within each shade category and by shade category within the analyzed material. Conclusions: Attenuation of light through restorative materials and tooth structure is high (59.9% to 94.9%); thus, deficits in polymerization are difficult to compensate for by additional light exposure at the end of the restorative process.

Sequential usage of diamond bur for CAD/CAM milling: Effect on the roughness, topography and fatigue strength of lithium disilicate glass ceramic

2019 ◽  
Vol 91 ◽  
pp. 326-334 ◽  
Author(s):  
Camila Ferreira Leite Madruga ◽  
Mírian Galvão Bueno ◽  
Amanda Maria de Oliveira Dal Piva ◽  
Catina Prochnow ◽  
Gabriel Kalil Rocha Pereira ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Glass Ceramic ◽  
Lithium Disilicate ◽  
Diamond Bur ◽  
Cad Cam
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