Online ISSN: 2515-8260

Keywords : Ceramic


Comparative Analysis of Effect of Liners on Shear Bond Strength of Veneered Zirconia Block: An Institutional Based Study

Renu Aggarwal, Rajnish Aggarwal, Anisha Aggarwal

European Journal of Molecular & Clinical Medicine, 2022, Volume 9, Issue 3, Pages 5232-5237

Introduction: All ceramic restorations which are comprised of porcelain veneer on a
zirconia substructure are gaining more interest since it almost replaced all the metal
ceramic restorations. The evaluation of bond strength of layered porcelain over zirconia
substructure could be just subjected to shear bond strength test, three & four points
flexure, tensile and micro-tensile bond test.
Materials and Methods: The study was designed as an in-vitro study which was
conducted in Surendera Dental College & Research Institute, Sri Ganganagar,
Rajasthan, India. The number of study samples were set at 80 which are fabricated
from VITA zirconia discs. Samples were divided into 4 groups. Each group having 20
samples. All the 80 samples were loaded under a standard shear load at a crosshead
speed of 0.5 mm/min and load was noted using universal testing machine (Asian
Universal Testing Machine, LRX 2K5, Hants, UK). Sample was taken for further
evaluation of the fracture mode. SEM study was done at 49 X, 350 X and 1000 X.
Statistical analysis was performed.
Results: Group I is control group, group II is lithium disilicate glass–ceramic liner
group, group III is silicon dioxide-based liner, and group IV is glass–ceramic interlayer
group. Mean shear bond strength in group I was 22.5 MPa, in group II was 62.2 MPA,
in group III was 63.4 MPa and in group IV was 34.9 MPa. The difference was
significant (P< 0.01).
Conclusion: SBS was reported maximum after the application of lithium disilicate
glass–ceramic liner at 930°C followed by glass–ceramic interlayer at the same sintering
temperature which is 930°C and silicon dioxide-based liner at 930°C. The fractographic
behaviour analyses that zirconia samples lined with lithium disilicate glass–ceramic
liner presented with adhesive failures (failure between glass–ceramic liner) whereas the
use of silicon dioxide-based liner showed cohesive failures (failure within veneering
porcelain) while the control group revealed with both cohesive and combined failures.

MODELING AND FE ANALYSIS OF FUNCTIONALLY GRADED (FG) COMPOSITE SHELL STRUCTURES

Rajat Yadav; Anas Islam; Kamal Sharma

European Journal of Molecular & Clinical Medicine, 2020, Volume 7, Issue 4, Pages 725-735

This manuscript comprises with FG (functionally graded) analysis and finite modeling element shell
frameworks under divergent loading like mechanical & thermal. The analysis of free vibration of FG
spherical shell framework has also been depicted. In respect to research the impact of significant aspects
on FG shell frameworks responses, divergent kinds of shells were deliberated. Here, responses were
attained for FG shells were compared to pure ceramic homogeneous shells (AI203) and EN 31 Steel (pure
metal) and it is perceived that FGM Shells responses were in between homogenous shells responses.
Furthermore, static analysis done on FG shell structure is to determine the circumferential and
longitudinal stress, strain and deformation. Furthermore, modal analysis is to be determining the natural
frequencies

Recent advances in the material aspects of veneers

Suresh Mitthra; S.Elanthendral., B.D.S.; Balasubramaniam Anuradha; Venkatachalam Prakash

European Journal of Molecular & Clinical Medicine, 2020, Volume 7, Issue 3, Pages 2079-2085

A Veneer is a layer of tooth colored material that is applied to a tooth to restore localized or generalized defects and intrinsic discolorations. Veneers are made from materials like chairside composite, processed composite, porcelain, ceramic, preformed acrylic laminates and glass ceramic veneers. The evolution of materials, ceramics and adhesive system helps in improving the aesthetics and self-esteem of the patients. The current article is a review that illustrates the recent advancements in material aspect and clinical techniques of dental veneers.