Evaluation of Marginal Fit of Two Types of Glass Ceramics (In Vitro Study)

2019 ◽  
Author(s):  
Youssef Y. Ashour
Keyword(s):  
Silicate Glass ◽  
Glass Ceramic ◽  
Inner Core ◽  
Lithium Silicate ◽  
Marginal Fit ◽  
Group I ◽  
All Ceramic ◽  
Cad Cam ◽  
Ceramic Crowns ◽  
Lithium Silicate Glass

Background: Veneered all-ceramic restorations are associated with a high incidence of chipping and veneer delamination from the inner core. Monolithic all-ceramic crowns facilitate the fabrication process and minimize residual stresses between core and veneer. A new material,zirconia-reinforced lithium silicate(ZRL), Celtra Duo was recently introduced for fabrication of monolithic anterior crowns to overcome the aesthetic drawbacks of traditional zirconia and also to improve the strength of the lithium disilicate. Aim of the study: To examine the marginal fit of CAD/CAM: zirconia reinforced lithium disilicatand to evaluate it with Lithium silicate glass-ceramic crowns. Materials and methods: Thirty monolithic ceramic specimens will be fabricated and divided into THREE main groups; Group I: CAD/CAM ZLS Celtra Duo milled and polished, Group II CAD /CAM ZLS Celtra Duo milled and glazed & Group III: CAD/CAM Lithium silicate glass-ceramic (e.max CAD). For evaluation of the marginal fit 30 ceramic crown specimens ten specimens from each material(N=10), subgroups Ia, IIa, IIIa will be fabricated according to the manufacturers’ instructions and thermocycled to simulate one year clinical service. Marginal fit will be measured for the same specimens by using CBCT (Ia, IIa, IIIa). For evolution of marginal fit 30 ceramic crowns will be fabricated, ten crowns from each material (N=10), subgroups Ia, IIa, IIIa. Results: Will be arrangeand statistically analyzed.

scholarly journals Evaluation of marginal adaptation of CAD/CAM vs conventional all-ceramic crowns on an implant abutment: An in vitro study

2021 ◽  
Vol 7 (2) ◽  
pp. 104-109
Author(s):  
Himanshu Aeran ◽  
Megha Sagar ◽  
Jyotsna Seth
Keyword(s):  
Marginal Adaptation ◽  
Marginal Fit ◽  
Group I ◽  
All Ceramic ◽  
Cad Cam ◽  
Marginal Discrepancy ◽  
Laboratory Procedures ◽  
Ceramic Crowns ◽  
The Mean ◽  
Vertical Gap

The survival of fixed prosthodontic restorations depends on the state of the marginal adaptation. Marginal gaps can create a favourable condition for biofilm deposition, thereby contributing to the development of caries and periodontal disease. The longevity of fixed prosthodontic restorations depends on the condition of the marginal adaptation to the abutment teeth. The presented work aimed to study, evaluate and compare the marginal adaptation of All-Ceramic crowns fabricated using conventional laboratory procedures with those fabricated using the CAD/CAM technology.To compare the marginal fit and adaptation of All- Ceramic crowns obtained by conventional techniques and crowns obtained by CAD/CAM technique. The presented study focused on a total of 20 samples divided into two groups viz. Group I (Conventional) and Group II (CAD/CAM) having 10 sample each. The samples were prepared with the straight abutment having a standardized collar height of 2mm, HIOSSEN that was mounted on acrylic blocks using implant analogue, HIOSSEN. A set of crowns was produced by 5-axis milling lithium disilicate using glass-ceramic blocks with laboratory fabrication methods. Another set of zirconia crowns was produced using CAD/CAM technology. Circumferential marginal gap measurements were taken at 12 measurement locations on the hexagonal die marked equidistant to each other. Both the samples were measured for marginal discrepancy at under the stereomicroscope.The results obtained showed that the mean vertical gap for the group II samples showed the least variation in the marginal discrepancy. Although the mean obtained for both the groups showed that the mean vertical marginal discrepancy was within the clinically acceptable level.It can be concluded that within the limitation of the study the data obtained showed that The Mean vertical gap was the maximum for Group I (Conventional group) i.e. 49.25 µm showing maximum variation in marginal fit. While the CAD/CAM Group had shown least vertical marginal discrepancy which depicts statistically significant better marginal fit than those fabricated using conventional laboratory procedures.

Mechanical integrity of cement- and screw-retained zirconium-lithium silicate glass-ceramic crowns to Morse taper implants

2018 ◽  
Vol 120 (5) ◽  
pp. 721-731 ◽  
Author(s):  
Brendan R. Vahey ◽  
Mariane B. Sordi ◽  
Kyle Stanley ◽  
Ricardo S. Magini ◽  
Antonio P. Novaes de Oliveira ◽  
...  
Keyword(s):  
Silicate Glass ◽  
Glass Ceramic ◽  
Lithium Silicate ◽  
Mechanical Integrity ◽  
Ceramic Crowns ◽  
Lithium Silicate Glass

Crystallization of a Lithium Silicate Glass-Ceramic under Pressure

1995 ◽  
Vol 78 (4) ◽  
pp. 1115-1117 ◽  
Author(s):  
Sylvia M. Johnson ◽  
Robert H. Lamoreau ◽  
Ronald E. Loehman
Keyword(s):  
Silicate Glass ◽  
Glass Ceramic ◽  
Lithium Silicate ◽  
Lithium Silicate Glass

Strength-limiting damage in lithium silicate glass-ceramics associated with CAD–CAM

2019 ◽  
Vol 35 (1) ◽  
pp. 98-104 ◽  
Author(s):  
Dan L. Romanyk ◽  
Ysidora Torrealba Martinez ◽  
Sydney Veldhuis ◽  
Nyssa Rae ◽  
Yilan Guo ◽  
...  
Keyword(s):  
Silicate Glass ◽  
Glass Ceramics ◽  
Lithium Silicate ◽  
Cad Cam ◽  
Lithium Silicate Glass

scholarly journals Vickers Micro-Hardness of New Restorative CAD/CAM Dental Materials: Evaluation and Comparison after Exposure to Acidic Drink

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1246 ◽  
Author(s):  
Marco Colombo ◽  
Claudio Poggio ◽  
Alessandro Lasagna ◽  
Marco Chiesa ◽  
Andrea Scribante
Keyword(s):  
Glass Ceramic ◽  
Lithium Silicate ◽  
Micro Hardness ◽  
Percentage Loss ◽  
Computer Aided ◽  
Cad Cam ◽  
Nanohybrid Composite ◽  
Hybrid Ceramic ◽  
Hardness Values ◽  
Lithium Silicate Glass

CAD/CAM (computer-aided design/computer-aided manufacturing) for indirect restorative materials has been recently introduced in dentistry. The purpose of this study was to evaluate the change of the surface micro-hardness of different restorative CAD/CAM materials after exposure to a carbonated acidic drink (Coca-Cola, Coca-Cola Company, Milan, Italy). One hundred and eighty specimens of identical size (2 mm thickness) were obtained by sectioning each tested CAD/CAM block of four materials: a hybrid ceramic (CERASMART™, GC Corporation, Tokyo, Japan), a resin nano ceramic (Lava™ Ultimate, 3M, Monrovia, CA, USA), a nanohybrid composite (Grandio blocs, VOCO GmbH, Cuxhaven, Germany), and a zirconia-reinforced lithium silicate glass ceramic (VITA SUPRINITY® PC; VITA Zahnfabrik, Bad Sackingen, Germany). Forty-five specimens of each material were tested. Micro-hardness was measured at baseline, after 7 days and after 28 days. The data were analyzed. The micro-hardness of each material varied significantly after immersion in Coca-Cola. The nanohybrid composite had a high initial micro-hardness and the greatest percentage loss after acid exposure. The hybrid ceramic and the resin nano ceramic had similar percentage losses of micro-hardness values even if the second material had higher initial values. The zirconia-reinforced lithium silicate glass ceramic had the highest baseline values and the lowest percentage loss of micro-hardness. The different CAD/CAM materials presented different micro-hardness values before and after acid exposure.

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