Flexural strength and reliability of CAD/CAM materials for dental applications

2018 ◽  
Vol 34 ◽  
pp. e9
Author(s):  
M.A. Basílio ◽  
E. Lima ◽  
A.B. Soares ◽  
P.F. Cesar
Keyword(s):  
Flexural Strength ◽  
Cad Cam ◽  
Dental Applications

Development of Y-TZP Pre-Sintered Blocks for CAD-CAM Machining of Dental Prostheses

2008 ◽  
Vol 591-593 ◽  
pp. 712-716 ◽  
Author(s):  
Roberta M.C. Sasahara ◽  
H.N. Yoshimura ◽  
Cátia Fredericci ◽  
Alberto Calasans ◽  
Paulo Francisco Cesar ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Vickers Hardness ◽  
Empirical Equation ◽  
Tetragonal Zirconia ◽  
Linear Shrinkage ◽  
Dental Prostheses ◽  
Biaxial Flexural Strength ◽  
Cad Cam ◽  
Dental Applications ◽  
Tetragonal Zirconia Polycrystal

The aim of this work was to establish a route to produce pre-sintered blocks of Y-TZP (yttria stabilized tetragonal zirconia polycrystal) suitable to be machined in a commercial CADCAM system, used to manufacture crowns and bridge frameworks for dental applications. Two commercial Y-TZP powders were investigated. The powders were pressed with different compaction pressures (40 to 500 MPa) and pre-sintered at temperature ranging from 900 to 1100°C. Vickers hardness, biaxial flexural strength, and linear shrinkage could be correlated to the relative density of pre-sintered samples. Using an empirical equation, pre-sintered blocks with a pre-defined density could be prepared. The blocks withstood the machining in a CAD-CAM system, and the machined and sintered crowns presented good adaptation.

scholarly journals Comparison of Mechanical Properties of PMMA Disks for Digitally Designed Dentures

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1745
Author(s):  
Tamaki Hada ◽  
Manabu Kanazawa ◽  
Maiko Iwaki ◽  
Awutsadaporn Katheng ◽  
Shunsuke Minakuchi
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Water Sorption ◽  
Water Solubility ◽  
Flexural Modulus ◽  
Manufacturing Method ◽  
Heat Curing ◽  
Significant Difference ◽  
Cad Cam ◽  
Curing Method

In this study, the physical properties of a custom block manufactured using a self-polymerizing resin (Custom-block), the commercially available CAD/CAM PMMA disk (PMMA-disk), and a heat-polymerizing resin (Conventional PMMA) were evaluated via three different tests. The Custom-block was polymerized by pouring the self-polymerizing resin into a special tray, and Conventional PMMA was polymerized with a heat-curing method, according to the manufacturer’s recommended procedure. The specimens of each group were subjected to three-point bending, water sorption and solubility, and staining tests. The results showed that the materials met the requirements of the ISO standards in all tests, except for the staining tests. The highest flexural strength was exhibited by the PMMA-disk, followed by the Custom-block and the Conventional PMMA, and a significant difference was observed in the flexural strengths of all the materials (p < 0.001). The Custom-block showed a significantly higher flexural modulus and water solubility. The water sorption and discoloration of the Custom-block were significantly higher than those of the PMMA-disk, but not significantly different from those of the Conventional PMMA. In conclusion, the mechanical properties of the three materials differed depending on the manufacturing method, which considerably affected their flexural strength, flexural modulus, water sorption and solubility, and discoloration.

Chairside CAD/CAM materials. Part 2: Flexural strength testing

2017 ◽  
Vol 33 (1) ◽  
pp. 99-109 ◽  
Author(s):  
Michael Wendler ◽  
Renan Belli ◽  
Anselm Petschelt ◽  
Daniel Mevec ◽  
Walter Harrer ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Strength Testing ◽  
Cad Cam

Flexural strength of CAD-CAM and conventional interim resin materials with a surface sealant

2020 ◽  
Vol 124 (6) ◽  
pp. 800.e1-800.e7
Author(s):  
Gülce Çakmak ◽  
Hakan Yilmaz ◽  
Özge Aydoğ ◽  
Burak Yilmaz
Keyword(s):  
Flexural Strength ◽  
Cad Cam ◽  
Surface Sealant

scholarly journals Effect of the bur grit size on the flexural strength of a glass-ceramic

Cerâmica ◽  
2016 ◽  
Vol 62 (362) ◽  
pp. 121-127 ◽  
Author(s):  
P. P. Kist ◽  
I. L. Aurélio ◽  
M. Amaral ◽  
L. G. May
Keyword(s):  
Surface Roughness ◽  
Flexural Strength ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
Internal Surface ◽  
Grit Size ◽  
Diamond Grit ◽  
Cad Cam ◽  
Negative Effect ◽  
Ceramic Blocks

Abstract The purpose of the present study was to determine the biaxial flexural strength (BFS) of a CAD/CAM leucite reinforced glass-ceramic ground by diamond burs of different grit sizes and the influence of surface roughness on the BFS. For this, 104 plates were obtained from CAD/CAM ceramic blocks and divided into 4 groups (n = 26), according to bur grit size: extra-fine, fine, medium and coarse. Roughness parameters (Ra, RyMax) were measured, and plates were kept dry for 7 days. The flexural test was carried out and BFS was calculated. Ra, RyMax and BFS data were subjected to analysis of variance and post-hoc test. Weibull analysis was used to compare characteristic strength and Weibull modulus. Regression analysis was performed for BFS vs. Ra and RyMax. When burs with coarse grit were used, higher surface roughness values were found, causing a negative effect on the ceramic BFS (117 MPa for extra-fine, and 83 MPa for coarse). Correlation (r) between surface roughness and BFS was 0.78 for RyMax and 0.73 for Ra. Increases in diamond grit size have a significant negative effect on the BFS of leucite-reinforced glass-ceramics, suggesting that grinding of sintered glass-ceramic should be performed using burs with the finest grit possible in order to minimize internal surface flaws and maximize flexural strength.

We're Going Digital: The Current State of CAD/CAM Dentistry in Prosthodontics

2018 ◽  
Vol 7 (2) ◽  
pp. 30-35 ◽  
Author(s):  
Khaled E Ahmed
Keyword(s):  
Computer Aided Design ◽  
Superior Performance ◽  
Treatment Modalities ◽  
Special Focus ◽  
Delivery Of Care ◽  
Current State ◽  
Design And Manufacturing ◽  
Cad Cam ◽  
Aided Design ◽  
Dental Applications

This paper reviews the current state of computer-aided design and manufacturing (CAD/CAM) in dentistry, with a special focus on restorative dental applications. The potential, advantages, and limitations of the technology will be discussed, comparing the digital workflow to conventional techniques, based on contemporary clinical evidence. The technology does seem to offer a more streamlined and efficient means of treatment planning and delivery of care through reduced chairside time, with reported improved patient satisfaction. Nonetheless, the accuracy and treatment outcomes of CAD/CAM treatment modalities are inconsistent and do not support a superior performance to existing conventional techniques, rather a comparable one.

scholarly journals Biaxial flexural strength and Weilbull characteristics of adhesively luted hybrid and reinforced CAD/CAM materials to dentin: effect of self-etching ceramic primer versus hydrofluoric acid etching

2020 ◽  
Vol 34 (12) ◽  
pp. 1253-1268
Author(s):  
João Paulo Mendes Tribst ◽  
Amanda Maria de Oliveira Dal Piva ◽  
Gabriel Cirone Lopes ◽  
Alexandre Luiz Souto Borges ◽  
Marco Antonio Bottino ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Hydrofluoric Acid ◽  
Acid Etching ◽  
Biaxial Flexural Strength ◽  
Cad Cam

Influence of CAD-CAM milling on the flexural strength of Y-TZP dental ceramics

2019 ◽  
Vol 45 (8) ◽  
pp. 10250-10259
Author(s):  
Claudinei dos Santos ◽  
Bruno Galvão Simba ◽  
Ronaldo Reis Silva ◽  
Manuel Fellipe Rodrigues Pais Alves ◽  
Roberto Oliveira Magnago ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Dental Ceramics ◽  
Cad Cam

Comparison of the Low Temperature Degradation Properties of Two Y-TZP Ceramics for Dental Applications

2011 ◽  
Vol 492 ◽  
pp. 107-111 ◽  
Author(s):  
Yuan Fu Yi ◽  
Ning Wen ◽  
Xiao Ling Wang ◽  
Long Quan Shao ◽  
Chen Wang
Keyword(s):  
Low Temperature ◽  
Flexural Strength ◽  
Monoclinic Phase ◽  
Surface Microstructure ◽  
Force Microscopy ◽  
Dental Application ◽  
Before And After ◽  
Dental Applications ◽  
Degradation Properties

The purpose of this study was to investigate the influence of in vitro low-temperature degradation (LTD) treatments on the structural stability and mechanical properties of two commercial Y-TZP ceramics candidate for dental application. TZ-3YS and TZ-3YS-E powder were chosen because of there minor differences of chemical composition. The two powders were compacted at 200MPa using cold isostatic pressure, and densely sintered at 1500°C and 1450°C for 2hr respectively. Two methods of in vitro LTD treatments were performed, the first is to autoclave specimens in steam at 134°C, 2bar, for 1 to 5hr; the second is to immerse specimens into 4% acetic acid at 80°C for 168 hr. XRD was used to identify the crystal phases, flexural strength were tested according to ISO 6872 standard, surface microstructure was evaluated by Atomic Force Microscopy (AFM). Results show that the relative content of monoclinic phase was increasing with the prolonged aging time, the TZ-3YS was more sensitive to LTD compared with TZ-3YS-E. LTD tests did not necessary reduce the flexural strength of Y-TZP ceramics, the nucleation and growth of monoclinic phase were detected by AFM, and the surface microstructure induced by LTD was not identical between the two Y-TZP ceramics. AFM was a sensitive method to evaluate the transformation of Y-TZP ceramics. To choose appropriate Y-TZP powder for dental application, it is mandatory to examine the microstructure before and after LTD.

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